diff --git a/Makefile b/Makefile
index 515016fee..24b1c5372 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 CC=g++
-RELEASE=0.0.11
+RELEASE=0.0.12
 INSTALL=/usr/local/bin
-LIBS=lib/loop.js lib/path.js lib/fs.js lib/process.js lib/build.js lib/repl.js
+LIBS=lib/loop.js lib/path.js lib/fs.js lib/process.js lib/build.js lib/repl.js lib/acorn.js lib/configure.js
 MODULES=modules/net/net.o modules/epoll/epoll.o modules/fs/fs.o modules/sys/sys.o modules/vm/vm.o
 TARGET=just
 LIB=-ldl
diff --git a/builtins.S b/builtins.S
index 517a0d199..895de5b3e 100644
--- a/builtins.S
+++ b/builtins.S
@@ -28,6 +28,16 @@ _binary_lib_repl_js_start:
         .incbin "lib/repl.js"
         .global _binary_lib_repl_js_end
 _binary_lib_repl_js_end:
+.global _binary_lib_configure_js_start
+_binary_lib_configure_js_start:
+        .incbin "lib/configure.js"
+        .global _binary_lib_configure_js_end
+_binary_lib_configure_js_end:
+.global _binary_lib_acorn_js_start
+_binary_lib_acorn_js_start:
+        .incbin "lib/acorn.js"
+        .global _binary_lib_acorn_js_end
+_binary_lib_acorn_js_end:
 .global _binary_just_cc_start
 _binary_just_cc_start:
         .incbin "just.cc"
diff --git a/config.js b/config.js
index 2ceef628d..5a6e62a5f 100644
--- a/config.js
+++ b/config.js
@@ -4,7 +4,9 @@ const libs = [
   'lib/path.js',
   'lib/process.js',
   'lib/build.js',
-  'lib/repl.js'
+  'lib/repl.js',
+  'lib/configure.js',
+  'lib/acorn.js'
 ]
 
 const version = just.version.just
diff --git a/just.js b/just.js
index 9600aa055..8b4f6220d 100644
--- a/just.js
+++ b/just.js
@@ -138,7 +138,7 @@ function wrapRequire (cache = {}) {
     const { vm } = just
     const params = ['exports', 'require', 'module']
     const exports = {}
-    const module = { exports, type: 'native' }
+    const module = { exports, type: 'native', dirName: appRoot }
     module.text = just.builtin(path)
     if (!module.text) return
     const fun = vm.compile(module.text, path, params, [])
@@ -213,7 +213,7 @@ function clearTimeout (fd, loop = just.factory.loop) {
 }
 
 class SystemError extends Error {
-  constructor (syscall) { 
+  constructor (syscall) {
     const { sys } = just
     const errno = sys.errno()
     const message = `${syscall} (${errno}) ${sys.strerror(errno)}`
@@ -230,36 +230,35 @@ function setNonBlocking (fd) {
 }
 
 function parseArgs (args) {
-  let clean = false
-  let cleanall = false
-  let dump = false
-  let inspector = false
-  let silent = false
-  // TODO: most of these are build args - only parse them in the build script
+  const opts = { args }
   args = args.filter(arg => {
     if (arg === '--clean') {
-      clean = true
+      opts.clean = true
       return false
     }
     if (arg === '--cleanall') {
-      cleanall = true
+      opts.cleanall = true
       return false
     }
     if (arg === '--silent') {
-      silent = true
+      opts.silent = true
       return false
     }
     if (arg === '--inspector') {
-      inspector = true
+      opts.inspector = true
       return false
     }
     if (arg === '--dump') {
-      dump = true
+      opts.dump = true
+      return false
+    }
+    if (arg === '--static') {
+      opts.static = true
       return false
     }
     return true
   })
-  return { args, inspector, clean, cleanall, dump, silent }
+  return opts
 }
 
 function main () {
@@ -314,9 +313,9 @@ function main () {
   just.hrtime = wrapHrtime(just.sys.hrtime)
 
   delete global.console
-  const { args, dump, clean, cleanall, inspector, silent } = parseArgs(just.args)
-  just.waitForInspector = inspector
-  just.args = args
+  const opts = parseArgs(just.args)
+  just.waitForInspector = opts.inspector
+  just.args = opts.args
 
   function startup () {
     if (!just.args.length) return true
@@ -355,8 +354,13 @@ function main () {
     if (just.args[1] === 'build') {
       const buildModule = just.require('build')
       if (!buildModule) throw new Error('Build not Available')
-      const config = require(just.args[2] || 'config.json') || require('config.js') || {}
-      buildModule.run(config, { dump, clean, cleanall, silent })
+      let config
+      if (just.args.length > 2 && just.args[2].indexOf('.js') > -1) {
+        config = just.require('configure').configure(just.args[2], opts)
+      } else {
+        config = require(just.args[2] || 'config.json') || require('config.js') || {}
+      }
+      buildModule.run(config, opts)
         .catch(err => just.error(err.stack))
       return
     }
diff --git a/lib/acorn.js b/lib/acorn.js
new file mode 100644
index 000000000..53fa4d361
--- /dev/null
+++ b/lib/acorn.js
@@ -0,0 +1 @@
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t=t||self).acorn={})}(this,function(t){"use strict";var n={3:"abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile",5:"class enum extends super const export import",6:"enum",strict:"implements interface let package private protected public static yield",strictBind:"eval arguments"},e="break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this",o={5:e,"5module":e+" export import",6:e+" const class extends export import super"},h=/^in(stanceof)?$/,i="ªµºÀ-ÖØ-öø-ˁˆ-ˑˠ-ˤˬˮͰ-ʹͶͷͺ-ͽͿΆΈ-ΊΌΎ-ΡΣ-ϵϷ-ҁҊ-ԯԱ-Ֆՙՠ-ֈא-תׯ-ײؠ-يٮٯٱ-ۓەۥۦۮۯۺ-ۼۿܐܒ-ܯݍ-ޥޱߊ-ߪߴߵߺࠀ-ࠕࠚࠤࠨࡀ-ࡘࡠ-ࡪࢠ-ࢴࢶ-ࢽऄ-हऽॐक़-ॡॱ-ঀঅ-ঌএঐও-নপ-রলশ-হঽৎড়ঢ়য়-ৡৰৱৼਅ-ਊਏਐਓ-ਨਪ-ਰਲਲ਼ਵਸ਼ਸਹਖ਼-ੜਫ਼ੲ-ੴઅ-ઍએ-ઑઓ-નપ-રલળવ-હઽૐૠૡૹଅ-ଌଏଐଓ-ନପ-ରଲଳଵ-ହଽଡ଼ଢ଼ୟ-ୡୱஃஅ-ஊஎ-ஐஒ-கஙசஜஞடணதந-பம-ஹௐఅ-ఌఎ-ఐఒ-నప-హఽౘ-ౚౠౡಀಅ-ಌಎ-ಐಒ-ನಪ-ಳವ-ಹಽೞೠೡೱೲഅ-ഌഎ-ഐഒ-ഺഽൎൔ-ൖൟ-ൡൺ-ൿඅ-ඖක-නඳ-රලව-ෆก-ะาำเ-ๆກຂຄຆ-ຊຌ-ຣລວ-ະາຳຽເ-ໄໆໜ-ໟༀཀ-ཇཉ-ཬྈ-ྌက-ဪဿၐ-ၕၚ-ၝၡၥၦၮ-ၰၵ-ႁႎႠ-ჅჇჍა-ჺჼ-ቈቊ-ቍቐ-ቖቘቚ-ቝበ-ኈኊ-ኍነ-ኰኲ-ኵኸ-ኾዀዂ-ዅወ-ዖዘ-ጐጒ-ጕጘ-ፚᎀ-ᎏᎠ-Ᏽᏸ-ᏽᐁ-ᙬᙯ-ᙿᚁ-ᚚᚠ-ᛪᛮ-ᛸᜀ-ᜌᜎ-ᜑᜠ-ᜱᝀ-ᝑᝠ-ᝬᝮ-ᝰក-ឳៗៜᠠ-ᡸᢀ-ᢨᢪᢰ-ᣵᤀ-ᤞᥐ-ᥭᥰ-ᥴᦀ-ᦫᦰ-ᧉᨀ-ᨖᨠ-ᩔᪧᬅ-ᬳᭅ-ᭋᮃ-ᮠᮮᮯᮺ-ᯥᰀ-ᰣᱍ-ᱏᱚ-ᱽᲀ-ᲈᲐ-ᲺᲽ-Ჿᳩ-ᳬᳮ-ᳳᳵᳶᳺᴀ-ᶿḀ-ἕἘ-Ἕἠ-ὅὈ-Ὅὐ-ὗὙὛὝὟ-ώᾀ-ᾴᾶ-ᾼιῂ-ῄῆ-ῌῐ-ΐῖ-Ίῠ-Ῥῲ-ῴῶ-ῼⁱⁿₐ-ₜℂℇℊ-ℓℕ℘-ℝℤΩℨK-ℹℼ-ℿⅅ-ⅉⅎⅠ-ↈⰀ-Ⱞⰰ-ⱞⱠ-ⳤⳫ-ⳮⳲⳳⴀ-ⴥⴧⴭⴰ-ⵧⵯⶀ-ⶖⶠ-ⶦⶨ-ⶮⶰ-ⶶⶸ-ⶾⷀ-ⷆⷈ-ⷎⷐ-ⷖⷘ-ⷞ々-〇〡-〩〱-〵〸-〼ぁ-ゖ゛-ゟァ-ヺー-ヿㄅ-ㄯㄱ-ㆎㆠ-ㆺㇰ-ㇿ㐀-䶵一-鿯ꀀ-ꒌꓐ-ꓽꔀ-ꘌꘐ-ꘟꘪꘫꙀ-ꙮꙿ-ꚝꚠ-ꛯꜗ-ꜟꜢ-ꞈꞋ-ꞿꟂ-Ᶎꟷ-ꠁꠃ-ꠅꠇ-ꠊꠌ-ꠢꡀ-ꡳꢂ-ꢳꣲ-ꣷꣻꣽꣾꤊ-ꤥꤰ-ꥆꥠ-ꥼꦄ-ꦲꧏꧠ-ꧤꧦ-ꧯꧺ-ꧾꨀ-ꨨꩀ-ꩂꩄ-ꩋꩠ-ꩶꩺꩾ-ꪯꪱꪵꪶꪹ-ꪽꫀꫂꫛ-ꫝꫠ-ꫪꫲ-ꫴꬁ-ꬆꬉ-ꬎꬑ-ꬖꬠ-ꬦꬨ-ꬮꬰ-ꭚꭜ-ꭧꭰ-ꯢ가-힣ힰ-ퟆퟋ-ퟻ豈-舘並-龎ff-stﬓ-ﬗיִײַ-ﬨשׁ-זּטּ-לּמּנּסּףּפּצּ-ﮱﯓ-ﴽﵐ-ﶏﶒ-ﷇﷰ-ﷻﹰ-ﹴﹶ-ﻼＡ-Ｚａ-ｚｦ-ﾾￂ-ￇￊ-ￏￒ-ￗￚ-ￜ",s="‌‍·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-٩ٰۖ-ۜ۟-۪ۤۧۨ-ۭ۰-۹ܑܰ-݊ަ-ް߀-߉߫-߽߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛࣓-ࣣ࣡-ःऺ-़ा-ॏ॑-ॗॢॣ०-९ঁ-ঃ়া-ৄেৈো-্ৗৢৣ০-৯৾ਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑ੦-ੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣ૦-૯ૺ-૿ଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣ୦-୯ஂா-ூெ-ைொ-்ௗ௦-௯ఀ-ఄా-ౄె-ైొ-్ౕౖౢౣ౦-౯ಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣ೦-೯ഀ-ഃ഻഼ാ-ൄെ-ൈൊ-്ൗൢൣ൦-൯ංඃ්ා-ුූෘ-ෟ෦-෯ෲෳัิ-ฺ็-๎๐-๙ັິ-ຼ່-ໍ໐-໙༘༙༠-༩༹༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှ၀-၉ၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏ-ႝ፝-፟፩-፱ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝០-៩᠋-᠍᠐-᠙ᢩᤠ-ᤫᤰ-᤻᥆-᥏᧐-᧚ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼-᪉᪐-᪙᪰-᪽ᬀ-ᬄ᬴-᭄᭐-᭙᭫-᭳ᮀ-ᮂᮡ-ᮭ᮰-᮹᯦-᯳ᰤ-᰷᱀-᱉᱐-᱙᳐-᳔᳒-᳨᳭᳴᳷-᳹᷀-᷹᷻-᷿‿⁀⁔⃐-⃥⃜⃡-⃰⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꘠-꘩꙯ꙴ-꙽ꚞꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-ꣅ꣐-꣙꣠-꣱ꣿ-꤉ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀꧐-꧙ꧥ꧰-꧹ꨩ-ꨶꩃꩌꩍ꩐-꩙ꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭꯰-꯹ﬞ︀-️︠-︯︳︴﹍-﹏０-９＿",a=new RegExp("["+i+"]"),r=new RegExp("["+i+s+"]"),i=s=null,p=[0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,477,28,11,0,9,21,155,22,13,52,76,44,33,24,27,35,30,0,12,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,21,0,33,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,14,0,72,26,230,43,117,63,32,0,161,7,3,38,17,0,2,0,29,0,11,39,8,0,22,0,12,45,20,0,35,56,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,270,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,689,63,129,74,6,0,67,12,65,1,2,0,29,6135,9,754,9486,286,50,2,18,3,9,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,2357,44,11,6,17,0,370,43,1301,196,60,67,8,0,1205,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42710,42,4148,12,221,3,5761,15,7472,3104,541],c=[509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,525,10,176,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,4,9,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,232,6,3,6,4,0,29,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,135,4,60,6,26,9,1014,0,2,54,8,3,19723,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,262,6,10,9,419,13,1495,6,110,6,6,9,792487,239];function 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z=1,Q=2;W.parseFunction=function(t,e,i,s){this.initFunction(t),(9<=this.options.ecmaVersion||6<=this.options.ecmaVersion&&!s)&&(this.type===_.star&&e&Q&&this.unexpected(),t.generator=this.eat(_.star)),8<=this.options.ecmaVersion&&(t.async=!!s),e&z&&(t.id=4&e&&this.type!==_.name?null:this.parseIdent(),!t.id||e&Q||this.checkLVal(t.id,this.strict||t.generator||t.async?this.treatFunctionsAsVar?1:2:3));var a=this.yieldPos,r=this.awaitPos,n=this.awaitIdentPos;return this.yieldPos=0,this.awaitPos=0,this.awaitIdentPos=0,this.enterScope(D(t.async,t.generator)),e&z||(t.id=this.type===_.name?this.parseIdent():null),this.parseFunctionParams(t),this.parseFunctionBody(t,i,!1),this.yieldPos=a,this.awaitPos=r,this.awaitIdentPos=n,this.finishNode(t,e&z?"FunctionDeclaration":"FunctionExpression")},W.parseFunctionParams=function(t){this.expect(_.parenL),t.params=this.parseBindingList(_.parenR,!1,8<=this.options.ecmaVersion),this.checkYieldAwaitInDefaultParams()},W.parseClass=function(t,e){this.next();var i=this.strict;this.strict=!0,this.parseClassId(t,e),this.parseClassSuper(t);var s=this.startNode(),a=!1;for(s.body=[],this.expect(_.braceL);!this.eat(_.braceR);){var r=this.parseClassElement(null!==t.superClass);r&&(s.body.push(r),"MethodDefinition"===r.type&&"constructor"===r.kind&&(a&&this.raise(r.start,"Duplicate constructor in the same class"),a=!0))}return t.body=this.finishNode(s,"ClassBody"),this.strict=i,this.finishNode(t,e?"ClassDeclaration":"ClassExpression")},W.parseClassElement=function(t){var a=this;if(this.eat(_.semi))return null;function e(t,e){void 0===e&&(e=!1);var i=a.start,s=a.startLoc;return!!a.eatContextual(t)&&(!(a.type===_.parenL||e&&a.canInsertSemicolon())||(r.key&&a.unexpected(),r.computed=!1,r.key=a.startNodeAt(i,s),r.key.name=t,a.finishNode(r.key,"Identifier"),!1))}var r=this.startNode();r.kind="method",r.static=e("static");var i=this.eat(_.star),s=!1;i||(8<=this.options.ecmaVersion&&e("async",!0)?(s=!0,i=9<=this.options.ecmaVersion&&this.eat(_.star)):e("get")?r.kind="get":e("set")&&(r.kind="set")),r.key||this.parsePropertyName(r);var n=r.key,o=!1;return r.computed||r.static||!("Identifier"===n.type&&"constructor"===n.name||"Literal"===n.type&&"constructor"===n.value)?r.static&&"Identifier"===n.type&&"prototype"===n.name&&this.raise(n.start,"Classes may not have a static property named prototype"):("method"!==r.kind&&this.raise(n.start,"Constructor can't have get/set modifier"),i&&this.raise(n.start,"Constructor can't be a generator"),s&&this.raise(n.start,"Constructor can't be an async method"),r.kind="constructor",o=t),this.parseClassMethod(r,i,s,o),"get"===r.kind&&0!==r.value.params.length&&this.raiseRecoverable(r.value.start,"getter should have no params"),"set"===r.kind&&1!==r.value.params.length&&this.raiseRecoverable(r.value.start,"setter should have exactly one param"),"set"===r.kind&&"RestElement"===r.value.params[0].type&&this.raiseRecoverable(r.value.params[0].start,"Setter cannot use rest params"),r},W.parseClassMethod=function(t,e,i,s){return t.value=this.parseMethod(e,i,s),this.finishNode(t,"MethodDefinition")},W.parseClassId=function(t,e){this.type===_.name?(t.id=this.parseIdent(),e&&this.checkLVal(t.id,2,!1)):(!0===e&&this.unexpected(),t.id=null)},W.parseClassSuper=function(t){t.superClass=this.eat(_._extends)?this.parseExprSubscripts():null},W.parseExport=function(t,e){if(this.next(),this.eat(_.star))return this.expectContextual("from"),this.type!==_.string&&this.unexpected(),t.source=this.parseExprAtom(),this.semicolon(),this.finishNode(t,"ExportAllDeclaration");var i,s,a;if(this.eat(_._default))return this.checkExport(e,"default",this.lastTokStart),this.type===_._function||(i=this.isAsyncFunction())?(s=this.startNode(),this.next(),i&&this.next(),t.declaration=this.parseFunction(s,4|z,!1,i)):this.type===_._class?(a=this.startNode(),t.declaration=this.parseClass(a,"nullableID")):(t.declaration=this.parseMaybeAssign(),this.semicolon()),this.finishNode(t,"ExportDefaultDeclaration");if(this.shouldParseExportStatement())t.declaration=this.parseStatement(null),"VariableDeclaration"===t.declaration.type?this.checkVariableExport(e,t.declaration.declarations):this.checkExport(e,t.declaration.id.name,t.declaration.id.start),t.specifiers=[],t.source=null;else{if(t.declaration=null,t.specifiers=this.parseExportSpecifiers(e),this.eatContextual("from"))this.type!==_.string&&this.unexpected(),t.source=this.parseExprAtom();else{for(var r=0,n=t.specifiers;r<n.length;r+=1){var o=n[r];this.checkUnreserved(o.local),this.checkLocalExport(o.local)}t.source=null}this.semicolon()}return this.finishNode(t,"ExportNamedDeclaration")},W.checkExport=function(t,e,i){t&&(P(t,e)&&this.raiseRecoverable(i,"Duplicate export '"+e+"'"),t[e]=!0)},W.checkPatternExport=function(t,e){var i=e.type;if("Identifier"===i)this.checkExport(t,e.name,e.start);else if("ObjectPattern"===i)for(var s=0,a=e.properties;s<a.length;s+=1){var r=a[s];this.checkPatternExport(t,r)}else if("ArrayPattern"===i)for(var n=0,o=e.elements;n<o.length;n+=1){var h=o[n];h&&this.checkPatternExport(t,h)}else"Property"===i?this.checkPatternExport(t,e.value):"AssignmentPattern"===i?this.checkPatternExport(t,e.left):"RestElement"===i?this.checkPatternExport(t,e.argument):"ParenthesizedExpression"===i&&this.checkPatternExport(t,e.expression)},W.checkVariableExport=function(t,e){if(t)for(var i=0,s=e;i<s.length;i+=1){var a=s[i];this.checkPatternExport(t,a.id)}},W.shouldParseExportStatement=function(){return"var"===this.type.keyword||"const"===this.type.keyword||"class"===this.type.keyword||"function"===this.type.keyword||this.isLet()||this.isAsyncFunction()},W.parseExportSpecifiers=function(t){var e=[],i=!0;for(this.expect(_.braceL);!this.eat(_.braceR);){if(i)i=!1;else if(this.expect(_.comma),this.afterTrailingComma(_.braceR))break;var s=this.startNode();s.local=this.parseIdent(!0),s.exported=this.eatContextual("as")?this.parseIdent(!0):s.local,this.checkExport(t,s.exported.name,s.exported.start),e.push(this.finishNode(s,"ExportSpecifier"))}return e},W.parseImport=function(t){return this.next(),this.type===_.string?(t.specifiers=K,t.source=this.parseExprAtom()):(t.specifiers=this.parseImportSpecifiers(),this.expectContextual("from"),t.source=this.type===_.string?this.parseExprAtom():this.unexpected()),this.semicolon(),this.finishNode(t,"ImportDeclaration")},W.parseImportSpecifiers=function(){var t=[],e=!0;if(this.type===_.name){var i=this.startNode();if(i.local=this.parseIdent(),this.checkLVal(i.local,2),t.push(this.finishNode(i,"ImportDefaultSpecifier")),!this.eat(_.comma))return t}if(this.type===_.star){var s=this.startNode();return this.next(),this.expectContextual("as"),s.local=this.parseIdent(),this.checkLVal(s.local,2),t.push(this.finishNode(s,"ImportNamespaceSpecifier")),t}for(this.expect(_.braceL);!this.eat(_.braceR);){if(e)e=!1;else if(this.expect(_.comma),this.afterTrailingComma(_.braceR))break;var a=this.startNode();a.imported=this.parseIdent(!0),this.eatContextual("as")?a.local=this.parseIdent():(this.checkUnreserved(a.imported),a.local=a.imported),this.checkLVal(a.local,2),t.push(this.finishNode(a,"ImportSpecifier"))}return t},W.adaptDirectivePrologue=function(t){for(var e=0;e<t.length&&this.isDirectiveCandidate(t[e]);++e)t[e].directive=t[e].expression.raw.slice(1,-1)},W.isDirectiveCandidate=function(t){return"ExpressionStatement"===t.type&&"Literal"===t.expression.type&&"string"==typeof t.expression.value&&('"'===this.input[t.start]||"'"===this.input[t.start])};var X=O.prototype;X.toAssignable=function(t,e,i){if(6<=this.options.ecmaVersion&&t)switch(t.type){case"Identifier":this.inAsync&&"await"===t.name&&this.raise(t.start,"Cannot use 'await' as identifier inside an async function");break;case"ObjectPattern":case"ArrayPattern":case"RestElement":break;case"ObjectExpression":t.type="ObjectPattern",i&&this.checkPatternErrors(i,!0);for(var s=0,a=t.properties;s<a.length;s+=1){var r=a[s];this.toAssignable(r,e),"RestElement"!==r.type||"ArrayPattern"!==r.argument.type&&"ObjectPattern"!==r.argument.type||this.raise(r.argument.start,"Unexpected token")}break;case"Property":"init"!==t.kind&&this.raise(t.key.start,"Object pattern can't contain getter or setter"),this.toAssignable(t.value,e);break;case"ArrayExpression":t.type="ArrayPattern",i&&this.checkPatternErrors(i,!0),this.toAssignableList(t.elements,e);break;case"SpreadElement":t.type="RestElement",this.toAssignable(t.argument,e),"AssignmentPattern"===t.argument.type&&this.raise(t.argument.start,"Rest elements cannot have a default value");break;case"AssignmentExpression":"="!==t.operator&&this.raise(t.left.end,"Only '=' operator can be used for specifying default value."),t.type="AssignmentPattern",delete t.operator,this.toAssignable(t.left,e);case"AssignmentPattern":break;case"ParenthesizedExpression":this.toAssignable(t.expression,e,i);break;case"MemberExpression":if(!e)break;default:this.raise(t.start,"Assigning to rvalue")}else i&&this.checkPatternErrors(i,!0);return t},X.toAssignableList=function(t,e){for(var i,s=t.length,a=0;a<s;a++){var r=t[a];r&&this.toAssignable(r,e)}return s&&(i=t[s-1],6===this.options.ecmaVersion&&e&&i&&"RestElement"===i.type&&"Identifier"!==i.argument.type&&this.unexpected(i.argument.start)),t},X.parseSpread=function(t){var e=this.startNode();return this.next(),e.argument=this.parseMaybeAssign(!1,t),this.finishNode(e,"SpreadElement")},X.parseRestBinding=function(){var t=this.startNode();return this.next(),6===this.options.ecmaVersion&&this.type!==_.name&&this.unexpected(),t.argument=this.parseBindingAtom(),this.finishNode(t,"RestElement")},X.parseBindingAtom=function(){if(6<=this.options.ecmaVersion)switch(this.type){case _.bracketL:var t=this.startNode();return this.next(),t.elements=this.parseBindingList(_.bracketR,!0,!0),this.finishNode(t,"ArrayPattern");case _.braceL:return this.parseObj(!0)}return this.parseIdent()},X.parseBindingList=function(t,e,i){for(var s=[],a=!0;!this.eat(t);)if(a?a=!1:this.expect(_.comma),e&&this.type===_.comma)s.push(null);else{if(i&&this.afterTrailingComma(t))break;if(this.type===_.ellipsis){var r=this.parseRestBinding();this.parseBindingListItem(r),s.push(r),this.type===_.comma&&this.raise(this.start,"Comma is not permitted after the rest element"),this.expect(t);break}var n=this.parseMaybeDefault(this.start,this.startLoc);this.parseBindingListItem(n),s.push(n)}return s},X.parseBindingListItem=function(t){return t},X.parseMaybeDefault=function(t,e,i){if(i=i||this.parseBindingAtom(),this.options.ecmaVersion<6||!this.eat(_.eq))return i;var s=this.startNodeAt(t,e);return s.left=i,s.right=this.parseMaybeAssign(),this.finishNode(s,"AssignmentPattern")},X.checkLVal=function(t,e,i){switch(void 0===e&&(e=0),t.type){case"Identifier":2===e&&"let"===t.name&&this.raiseRecoverable(t.start,"let is disallowed as a lexically bound name"),this.strict&&this.reservedWordsStrictBind.test(t.name)&&this.raiseRecoverable(t.start,(e?"Binding ":"Assigning to ")+t.name+" in strict mode"),i&&(P(i,t.name)&&this.raiseRecoverable(t.start,"Argument name clash"),i[t.name]=!0),0!==e&&5!==e&&this.declareName(t.name,e,t.start);break;case"MemberExpression":e&&this.raiseRecoverable(t.start,"Binding member expression");break;case"ObjectPattern":for(var s=0,a=t.properties;s<a.length;s+=1){var r=a[s];this.checkLVal(r,e,i)}break;case"Property":this.checkLVal(t.value,e,i);break;case"ArrayPattern":for(var n=0,o=t.elements;n<o.length;n+=1){var h=o[n];h&&this.checkLVal(h,e,i)}break;case"AssignmentPattern":this.checkLVal(t.left,e,i);break;case"RestElement":this.checkLVal(t.argument,e,i);break;case"ParenthesizedExpression":this.checkLVal(t.expression,e,i);break;default:this.raise(t.start,(e?"Binding":"Assigning to")+" rvalue")}};var Z=O.prototype;Z.checkPropClash=function(t,e,i){if(!(9<=this.options.ecmaVersion&&"SpreadElement"===t.type||6<=this.options.ecmaVersion&&(t.computed||t.method||t.shorthand))){var s,a=t.key;switch(a.type){case"Identifier":s=a.name;break;case"Literal":s=String(a.value);break;default:return}var r,n=t.kind;6<=this.options.ecmaVersion?"__proto__"===s&&"init"===n&&(e.proto&&(i&&i.doubleProto<0?i.doubleProto=a.start:this.raiseRecoverable(a.start,"Redefinition of __proto__ property")),e.proto=!0):((r=e[s="$"+s])?("init"===n?this.strict&&r.init||r.get||r.set:r.init||r[n])&&this.raiseRecoverable(a.start,"Redefinition of property"):r=e[s]={init:!1,get:!1,set:!1},r[n]=!0)}},Z.parseExpression=function(t,e){var i=this.start,s=this.startLoc,a=this.parseMaybeAssign(t,e);if(this.type!==_.comma)return a;var r=this.startNodeAt(i,s);for(r.expressions=[a];this.eat(_.comma);)r.expressions.push(this.parseMaybeAssign(t,e));return this.finishNode(r,"SequenceExpression")},Z.parseMaybeAssign=function(t,e,i){if(this.isContextual("yield")){if(this.inGenerator)return this.parseYield(t);this.exprAllowed=!1}var s=!1,a=-1,r=-1,n=-1;e?(a=e.parenthesizedAssign,r=e.trailingComma,n=e.shorthandAssign,e.parenthesizedAssign=e.trailingComma=e.shorthandAssign=-1):(e=new G,s=!0);var o=this.start,h=this.startLoc;this.type!==_.parenL&&this.type!==_.name||(this.potentialArrowAt=this.start);var p=this.parseMaybeConditional(t,e);if(i&&(p=i.call(this,p,o,h)),this.type.isAssign){var c=this.startNodeAt(o,h);return c.operator=this.value,c.left=this.type===_.eq?this.toAssignable(p,!1,e):p,s||G.call(e),e.shorthandAssign=-1,this.checkLVal(p),this.next(),c.right=this.parseMaybeAssign(t),this.finishNode(c,"AssignmentExpression")}return s&&this.checkExpressionErrors(e,!0),-1<a&&(e.parenthesizedAssign=a),-1<r&&(e.trailingComma=r),-1<n&&(e.shorthandAssign=n),p},Z.parseMaybeConditional=function(t,e){var i=this.start,s=this.startLoc,a=this.parseExprOps(t,e);if(this.checkExpressionErrors(e))return a;if(this.eat(_.question)){var r=this.startNodeAt(i,s);return r.test=a,r.consequent=this.parseMaybeAssign(),this.expect(_.colon),r.alternate=this.parseMaybeAssign(t),this.finishNode(r,"ConditionalExpression")}return a},Z.parseExprOps=function(t,e){var i=this.start,s=this.startLoc,a=this.parseMaybeUnary(e,!1);return this.checkExpressionErrors(e)||a.start===i&&"ArrowFunctionExpression"===a.type?a:this.parseExprOp(a,i,s,-1,t)},Z.parseExprOp=function(t,e,i,s,a){var r=this.type.binop;if(null==r||a&&this.type===_._in||!(s<r))return t;var n=this.type===_.logicalOR||this.type===_.logicalAND,o=this.value;this.next();var h=this.start,p=this.startLoc,c=this.parseExprOp(this.parseMaybeUnary(null,!1),h,p,r,a),u=this.buildBinary(e,i,t,c,o,n);return this.parseExprOp(u,e,i,s,a)},Z.buildBinary=function(t,e,i,s,a,r){var n=this.startNodeAt(t,e);return n.left=i,n.operator=a,n.right=s,this.finishNode(n,r?"LogicalExpression":"BinaryExpression")},Z.parseMaybeUnary=function(t,e){var i,s=this.start,a=this.startLoc;if(this.isContextual("await")&&(this.inAsync||!this.inFunction&&this.options.allowAwaitOutsideFunction))i=this.parseAwait(),e=!0;else if(this.type.prefix){var r=this.startNode(),n=this.type===_.incDec;r.operator=this.value,r.prefix=!0,this.next(),r.argument=this.parseMaybeUnary(null,!0),this.checkExpressionErrors(t,!0),n?this.checkLVal(r.argument):this.strict&&"delete"===r.operator&&"Identifier"===r.argument.type?this.raiseRecoverable(r.start,"Deleting local variable in strict mode"):e=!0,i=this.finishNode(r,n?"UpdateExpression":"UnaryExpression")}else{if(i=this.parseExprSubscripts(t),this.checkExpressionErrors(t))return i;for(;this.type.postfix&&!this.canInsertSemicolon();){var o=this.startNodeAt(s,a);o.operator=this.value,o.prefix=!1,o.argument=i,this.checkLVal(i),this.next(),i=this.finishNode(o,"UpdateExpression")}}return!e&&this.eat(_.starstar)?this.buildBinary(s,a,i,this.parseMaybeUnary(null,!1),"**",!1):i},Z.parseExprSubscripts=function(t){var e=this.start,i=this.startLoc,s=this.parseExprAtom(t),a="ArrowFunctionExpression"===s.type&&")"!==this.input.slice(this.lastTokStart,this.lastTokEnd);if(this.checkExpressionErrors(t)||a)return s;var r=this.parseSubscripts(s,e,i);return t&&"MemberExpression"===r.type&&(t.parenthesizedAssign>=r.start&&(t.parenthesizedAssign=-1),t.parenthesizedBind>=r.start&&(t.parenthesizedBind=-1)),r},Z.parseSubscripts=function(t,e,i,s){for(var a=8<=this.options.ecmaVersion&&"Identifier"===t.type&&"async"===t.name&&this.lastTokEnd===t.end&&!this.canInsertSemicolon()&&"async"===this.input.slice(t.start,t.end);;){var r=this.parseSubscript(t,e,i,s,a);if(r===t||"ArrowFunctionExpression"===r.type)return r;t=r}},Z.parseSubscript=function(t,e,i,s,a){var r,n=this.eat(_.bracketL);if(n||this.eat(_.dot)){var o=this.startNodeAt(e,i);o.object=t,o.property=n?this.parseExpression():this.parseIdent("never"!==this.options.allowReserved),o.computed=!!n,n&&this.expect(_.bracketR),t=this.finishNode(o,"MemberExpression")}else if(!s&&this.eat(_.parenL)){var h=new G,p=this.yieldPos,c=this.awaitPos,u=this.awaitIdentPos;this.yieldPos=0,this.awaitPos=0,this.awaitIdentPos=0;var l=this.parseExprList(_.parenR,8<=this.options.ecmaVersion&&"Import"!==t.type,!1,h);if(a&&!this.canInsertSemicolon()&&this.eat(_.arrow))return this.checkPatternErrors(h,!1),this.checkYieldAwaitInDefaultParams(),0<this.awaitIdentPos&&this.raise(this.awaitIdentPos,"Cannot use 'await' as identifier inside an async function"),this.yieldPos=p,this.awaitPos=c,this.awaitIdentPos=u,this.parseArrowExpression(this.startNodeAt(e,i),l,!0);this.checkExpressionErrors(h,!0),this.yieldPos=p||this.yieldPos,this.awaitPos=c||this.awaitPos,this.awaitIdentPos=u||this.awaitIdentPos;var d,f=this.startNodeAt(e,i);f.callee=t,f.arguments=l,"Import"===f.callee.type&&(1!==f.arguments.length&&this.raise(f.start,"import() requires exactly one argument"),(d=f.arguments[0])&&"SpreadElement"===d.type&&this.raise(d.start,"... is not allowed in import()")),t=this.finishNode(f,"CallExpression")}else{this.type===_.backQuote&&((r=this.startNodeAt(e,i)).tag=t,r.quasi=this.parseTemplate({isTagged:!0}),t=this.finishNode(r,"TaggedTemplateExpression"))}return t},Z.parseExprAtom=function(t){this.type===_.slash&&this.readRegexp();var e=this.potentialArrowAt===this.start;switch(this.type){case _._super:return this.allowSuper||this.raise(this.start,"'super' keyword outside a method"),n=this.startNode(),this.next(),this.type!==_.parenL||this.allowDirectSuper||this.raise(n.start,"super() call outside constructor of a subclass"),this.type!==_.dot&&this.type!==_.bracketL&&this.type!==_.parenL&&this.unexpected(),this.finishNode(n,"Super");case _._this:return n=this.startNode(),this.next(),this.finishNode(n,"ThisExpression");case _.name:var i=this.start,s=this.startLoc,a=this.containsEsc,r=this.parseIdent(!1);if(8<=this.options.ecmaVersion&&!a&&"async"===r.name&&!this.canInsertSemicolon()&&this.eat(_._function))return this.parseFunction(this.startNodeAt(i,s),0,!1,!0);if(e&&!this.canInsertSemicolon()){if(this.eat(_.arrow))return this.parseArrowExpression(this.startNodeAt(i,s),[r],!1);if(8<=this.options.ecmaVersion&&"async"===r.name&&this.type===_.name&&!a)return r=this.parseIdent(!1),!this.canInsertSemicolon()&&this.eat(_.arrow)||this.unexpected(),this.parseArrowExpression(this.startNodeAt(i,s),[r],!0)}return r;case _.regexp:var n,o=this.value;return(n=this.parseLiteral(o.value)).regex={pattern:o.pattern,flags:o.flags},n;case _.num:case _.string:return this.parseLiteral(this.value);case _._null:case _._true:case _._false:return(n=this.startNode()).value=this.type===_._null?null:this.type===_._true,n.raw=this.type.keyword,this.next(),this.finishNode(n,"Literal");case _.parenL:var h=this.start,p=this.parseParenAndDistinguishExpression(e);return t&&(t.parenthesizedAssign<0&&!this.isSimpleAssignTarget(p)&&(t.parenthesizedAssign=h),t.parenthesizedBind<0&&(t.parenthesizedBind=h)),p;case _.bracketL:return n=this.startNode(),this.next(),n.elements=this.parseExprList(_.bracketR,!0,!0,t),this.finishNode(n,"ArrayExpression");case _.braceL:return this.parseObj(!1,t);case _._function:return n=this.startNode(),this.next(),this.parseFunction(n,0);case _._class:return this.parseClass(this.startNode(),!1);case _._new:return this.parseNew();case _.backQuote:return this.parseTemplate();case _._import:return 10<this.options.ecmaVersion?this.parseDynamicImport():this.unexpected();default:this.unexpected()}},Z.parseDynamicImport=function(){var t=this.startNode();return this.next(),this.type!==_.parenL&&this.unexpected(),this.finishNode(t,"Import")},Z.parseLiteral=function(t){var e=this.startNode();return e.value=t,e.raw=this.input.slice(this.start,this.end),110===e.raw.charCodeAt(e.raw.length-1)&&(e.bigint=e.raw.slice(0,-1)),this.next(),this.finishNode(e,"Literal")},Z.parseParenExpression=function(){this.expect(_.parenL);var t=this.parseExpression();return this.expect(_.parenR),t},Z.parseParenAndDistinguishExpression=function(t){var e,i=this.start,s=this.startLoc,a=8<=this.options.ecmaVersion;if(6<=this.options.ecmaVersion){this.next();var r,n=this.start,o=this.startLoc,h=[],p=!0,c=!1,u=new G,l=this.yieldPos,d=this.awaitPos;for(this.yieldPos=0,this.awaitPos=0;this.type!==_.parenR;){if(p?p=!1:this.expect(_.comma),a&&this.afterTrailingComma(_.parenR,!0)){c=!0;break}if(this.type===_.ellipsis){r=this.start,h.push(this.parseParenItem(this.parseRestBinding())),this.type===_.comma&&this.raise(this.start,"Comma is not permitted after the rest element");break}h.push(this.parseMaybeAssign(!1,u,this.parseParenItem))}var f=this.start,m=this.startLoc;if(this.expect(_.parenR),t&&!this.canInsertSemicolon()&&this.eat(_.arrow))return this.checkPatternErrors(u,!1),this.checkYieldAwaitInDefaultParams(),this.yieldPos=l,this.awaitPos=d,this.parseParenArrowList(i,s,h);h.length&&!c||this.unexpected(this.lastTokStart),r&&this.unexpected(r),this.checkExpressionErrors(u,!0),this.yieldPos=l||this.yieldPos,this.awaitPos=d||this.awaitPos,1<h.length?((e=this.startNodeAt(n,o)).expressions=h,this.finishNodeAt(e,"SequenceExpression",f,m)):e=h[0]}else e=this.parseParenExpression();if(this.options.preserveParens){var g=this.startNodeAt(i,s);return g.expression=e,this.finishNode(g,"ParenthesizedExpression")}return e},Z.parseParenItem=function(t){return t},Z.parseParenArrowList=function(t,e,i){return this.parseArrowExpression(this.startNodeAt(t,e),i)};var Y=[];Z.parseNew=function(){var t=this.startNode(),e=this.parseIdent(!0);if(6<=this.options.ecmaVersion&&this.eat(_.dot)){t.meta=e;var i=this.containsEsc;return t.property=this.parseIdent(!0),"target"===t.property.name&&!i||this.raiseRecoverable(t.property.start,"The only valid meta 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this.parsePropertyName(n),!t&&!o&&8<=this.options.ecmaVersion&&!i&&this.isAsyncProp(n)?(s=!0,i=9<=this.options.ecmaVersion&&this.eat(_.star),this.parsePropertyName(n,e)):s=!1,this.parsePropertyValue(n,t,i,s,a,r,e,o),this.finishNode(n,"Property")},Z.parsePropertyValue=function(t,e,i,s,a,r,n,o){var h,p;(i||s)&&this.type===_.colon&&this.unexpected(),this.eat(_.colon)?(t.value=e?this.parseMaybeDefault(this.start,this.startLoc):this.parseMaybeAssign(!1,n),t.kind="init"):6<=this.options.ecmaVersion&&this.type===_.parenL?(e&&this.unexpected(),t.kind="init",t.method=!0,t.value=this.parseMethod(i,s)):e||o||!(5<=this.options.ecmaVersion)||t.computed||"Identifier"!==t.key.type||"get"!==t.key.name&&"set"!==t.key.name||this.type===_.comma||this.type===_.braceR?6<=this.options.ecmaVersion&&!t.computed&&"Identifier"===t.key.type?((i||s)&&this.unexpected(),this.checkUnreserved(t.key),"await"!==t.key.name||this.awaitIdentPos||(this.awaitIdentPos=a),t.kind="init",e?t.value=this.parseMaybeDefault(a,r,t.key):this.type===_.eq&&n?(n.shorthandAssign<0&&(n.shorthandAssign=this.start),t.value=this.parseMaybeDefault(a,r,t.key)):t.value=t.key,t.shorthand=!0):this.unexpected():((i||s)&&this.unexpected(),t.kind=t.key.name,this.parsePropertyName(t),t.value=this.parseMethod(!1),h="get"===t.kind?0:1,t.value.params.length!==h?(p=t.value.start,"get"===t.kind?this.raiseRecoverable(p,"getter 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this.initFunction(s),6<=this.options.ecmaVersion&&(s.generator=t),8<=this.options.ecmaVersion&&(s.async=!!e),this.yieldPos=0,this.awaitPos=0,this.awaitIdentPos=0,this.enterScope(64|D(e,s.generator)|(i?128:0)),this.expect(_.parenL),s.params=this.parseBindingList(_.parenR,!1,8<=this.options.ecmaVersion),this.checkYieldAwaitInDefaultParams(),this.parseFunctionBody(s,!1,!0),this.yieldPos=a,this.awaitPos=r,this.awaitIdentPos=n,this.finishNode(s,"FunctionExpression")},Z.parseArrowExpression=function(t,e,i){var s=this.yieldPos,a=this.awaitPos,r=this.awaitIdentPos;return this.enterScope(16|D(i,!1)),this.initFunction(t),8<=this.options.ecmaVersion&&(t.async=!!i),this.yieldPos=0,this.awaitPos=0,this.awaitIdentPos=0,t.params=this.toAssignableList(e,!0),this.parseFunctionBody(t,!0,!1),this.yieldPos=s,this.awaitPos=a,this.awaitIdentPos=r,this.finishNode(t,"ArrowFunctionExpression")},Z.parseFunctionBody=function(t,e,i){var s,a,r=e&&this.type!==_.braceL,n=this.strict,o=!1;r?(t.body=this.parseMaybeAssign(),t.expression=!0,this.checkParams(t,!1)):(s=7<=this.options.ecmaVersion&&!this.isSimpleParamList(t.params),n&&!s||(o=this.strictDirective(this.end))&&s&&this.raiseRecoverable(t.start,"Illegal 'use strict' directive in function with non-simple parameter list"),a=this.labels,this.labels=[],o&&(this.strict=!0),this.checkParams(t,!n&&!o&&!e&&!i&&this.isSimpleParamList(t.params)),t.body=this.parseBlock(!1),t.expression=!1,this.adaptDirectivePrologue(t.body.body),this.labels=a),this.exitScope(),this.strict&&t.id&&this.checkLVal(t.id,5),this.strict=n},Z.isSimpleParamList=function(t){for(var e=0,i=t;e<i.length;e+=1){if("Identifier"!==i[e].type)return!1}return!0},Z.checkParams=function(t,e){for(var i={},s=0,a=t.params;s<a.length;s+=1){var r=a[s];this.checkLVal(r,1,e?null:i)}},Z.parseExprList=function(t,e,i,s){for(var a=[],r=!0;!this.eat(t);){if(r)r=!1;else if(this.expect(_.comma),e&&this.afterTrailingComma(t))break;var n=void 0;i&&this.type===_.comma?n=null:this.type===_.ellipsis?(n=this.parseSpread(s),s&&this.type===_.comma&&s.trailingComma<0&&(s.trailingComma=this.start)):n=this.parseMaybeAssign(!1,s),a.push(n)}return a},Z.checkUnreserved=function(t){var e=t.start,i=t.end,s=t.name;this.inGenerator&&"yield"===s&&this.raiseRecoverable(e,"Cannot use 'yield' as identifier inside a generator"),this.inAsync&&"await"===s&&this.raiseRecoverable(e,"Cannot use 'await' as identifier inside an async function"),this.keywords.test(s)&&this.raise(e,"Unexpected keyword '"+s+"'"),this.options.ecmaVersion<6&&-1!==this.input.slice(e,i).indexOf("\\")||(this.strict?this.reservedWordsStrict:this.reservedWords).test(s)&&(this.inAsync||"await"!==s||this.raiseRecoverable(e,"Cannot use keyword 'await' outside an async function"),this.raiseRecoverable(e,"The keyword '"+s+"' is reserved"))},Z.parseIdent=function(t,e){var i=this.startNode();return this.type===_.name?i.name=this.value:this.type.keyword?(i.name=this.type.keyword,"class"!==i.name&&"function"!==i.name||this.lastTokEnd===this.lastTokStart+1&&46===this.input.charCodeAt(this.lastTokStart)||this.context.pop()):this.unexpected(),this.next(),this.finishNode(i,"Identifier"),t||(this.checkUnreserved(i),"await"!==i.name||this.awaitIdentPos||(this.awaitIdentPos=i.start)),i},Z.parseYield=function(t){this.yieldPos||(this.yieldPos=this.start);var e=this.startNode();return this.next(),this.type===_.semi||this.canInsertSemicolon()||this.type!==_.star&&!this.type.startsExpr?(e.delegate=!1,e.argument=null):(e.delegate=this.eat(_.star),e.argument=this.parseMaybeAssign(t)),this.finishNode(e,"YieldExpression")},Z.parseAwait=function(){this.awaitPos||(this.awaitPos=this.start);var t=this.startNode();return this.next(),t.argument=this.parseMaybeUnary(null,!0),this.finishNode(t,"AwaitExpression")};var J=O.prototype;J.raise=function(t,e){var i=R(this.input,t);e+=" 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o=this.scopeStack[n];if(-1<o.lexical.indexOf(t)&&!(32&o.flags&&o.lexical[0]===t)||!this.treatFunctionsAsVarInScope(o)&&-1<o.functions.indexOf(t)){s=!0;break}if(o.var.push(t),this.inModule&&1&o.flags&&delete this.undefinedExports[t],3&o.flags)break}s&&this.raiseRecoverable(i,"Identifier '"+t+"' has already been declared")},tt.checkLocalExport=function(t){-1===this.scopeStack[0].lexical.indexOf(t.name)&&-1===this.scopeStack[0].var.indexOf(t.name)&&(this.undefinedExports[t.name]=t)},tt.currentScope=function(){return this.scopeStack[this.scopeStack.length-1]},tt.currentVarScope=function(){for(var t=this.scopeStack.length-1;;t--){var e=this.scopeStack[t];if(3&e.flags)return e}},tt.currentThisScope=function(){for(var t=this.scopeStack.length-1;;t--){var e=this.scopeStack[t];if(3&e.flags&&!(16&e.flags))return e}};function et(t,e,i){this.type="",this.start=e,this.end=0,t.options.locations&&(this.loc=new 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t;1!==this.context.length?((t=this.context.pop())===rt.b_stat&&"function"===this.curContext().token&&(t=this.context.pop()),this.exprAllowed=!t.isExpr):this.exprAllowed=!0},_.braceL.updateContext=function(t){this.context.push(this.braceIsBlock(t)?rt.b_stat:rt.b_expr),this.exprAllowed=!0},_.dollarBraceL.updateContext=function(){this.context.push(rt.b_tmpl),this.exprAllowed=!0},_.parenL.updateContext=function(t){var 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Newa Nko Nkoo Nushu Nshu Ogham Ogam Ol_Chiki Olck Old_Hungarian Hung Old_Italic Ital Old_North_Arabian Narb Old_Permic Perm Old_Persian Xpeo Old_South_Arabian Sarb Old_Turkic Orkh Oriya Orya Osage Osge Osmanya Osma Pahawh_Hmong Hmng Palmyrene Palm Pau_Cin_Hau Pauc Phags_Pa Phag Phoenician Phnx Psalter_Pahlavi Phlp Rejang Rjng Runic Runr Samaritan Samr Saurashtra Saur Sharada Shrd Shavian Shaw Siddham Sidd SignWriting Sgnw Sinhala Sinh Sora_Sompeng Sora Soyombo Soyo Sundanese Sund Syloti_Nagri Sylo Syriac Syrc Tagalog Tglg Tagbanwa Tagb Tai_Le Tale Tai_Tham Lana Tai_Viet Tavt Takri Takr Tamil Taml Tangut Tang Telugu Telu Thaana Thaa Thai Thai Tibetan Tibt Tifinagh Tfng Tirhuta Tirh Ugaritic Ugar Vai Vaii Warang_Citi Wara Yi Yiii Zanabazar_Square Zanb",lt=ut+" Dogra Dogr Gunjala_Gondi Gong Hanifi_Rohingya Rohg Makasar Maka Medefaidrin Medf Old_Sogdian Sogo Sogdian Sogd",dt={9:ut,10:lt,11:"Adlam Adlm Ahom Ahom Anatolian_Hieroglyphs Hluw Arabic Arab Armenian Armn Avestan Avst Balinese Bali Bamum Bamu Bassa_Vah Bass Batak Batk Bengali Beng Bhaiksuki Bhks Bopomofo Bopo Brahmi Brah Braille Brai Buginese Bugi Buhid Buhd Canadian_Aboriginal Cans Carian Cari Caucasian_Albanian Aghb Chakma Cakm Cham Cham Cherokee Cher Common Zyyy Coptic Copt Qaac Cuneiform Xsux Cypriot Cprt Cyrillic Cyrl Deseret Dsrt Devanagari Deva Duployan Dupl Egyptian_Hieroglyphs Egyp Elbasan Elba Ethiopic Ethi Georgian Geor Glagolitic Glag Gothic Goth Grantha Gran Greek Grek Gujarati Gujr Gurmukhi Guru Han Hani Hangul Hang Hanunoo Hano Hatran Hatr Hebrew Hebr Hiragana Hira Imperial_Aramaic Armi Inherited Zinh Qaai Inscriptional_Pahlavi Phli Inscriptional_Parthian Prti Javanese Java Kaithi Kthi Kannada Knda Katakana Kana Kayah_Li Kali Kharoshthi Khar Khmer Khmr Khojki Khoj Khudawadi Sind Lao Laoo Latin Latn Lepcha Lepc Limbu Limb Linear_A Lina Linear_B Linb Lisu Lisu Lycian Lyci Lydian Lydi Mahajani Mahj Malayalam Mlym Mandaic Mand Manichaean Mani Marchen Marc Masaram_Gondi Gonm Meetei_Mayek Mtei Mende_Kikakui Mend Meroitic_Cursive Merc Meroitic_Hieroglyphs Mero Miao Plrd Modi Modi Mongolian Mong Mro Mroo Multani Mult Myanmar Mymr Nabataean Nbat New_Tai_Lue Talu Newa Newa Nko Nkoo Nushu Nshu Ogham Ogam Ol_Chiki Olck Old_Hungarian Hung Old_Italic Ital Old_North_Arabian Narb Old_Permic Perm Old_Persian Xpeo Old_South_Arabian Sarb Old_Turkic Orkh Oriya Orya Osage Osge Osmanya Osma Pahawh_Hmong Hmng Palmyrene Palm Pau_Cin_Hau Pauc Phags_Pa Phag Phoenician Phnx Psalter_Pahlavi Phlp Rejang Rjng Runic Runr Samaritan Samr Saurashtra Saur Sharada Shrd Shavian Shaw Siddham Sidd SignWriting Sgnw Sinhala Sinh Sora_Sompeng Sora Soyombo Soyo Sundanese Sund Syloti_Nagri Sylo Syriac Syrc Tagalog Tglg Tagbanwa Tagb Tai_Le Tale Tai_Tham Lana Tai_Viet Tavt Takri Takr Tamil Taml Tangut Tang Telugu Telu Thaana Thaa Thai Thai Tibetan Tibt Tifinagh Tfng Tirhuta Tirh Ugaritic Ugar Vai Vaii Warang_Citi Wara Yi Yiii Zanabazar_Square Zanb Dogra Dogr Gunjala_Gondi Gong Hanifi_Rohingya Rohg Makasar Maka Medefaidrin Medf Old_Sogdian Sogo Sogdian Sogd Elymaic Elym Nandinagari Nand Nyiakeng_Puachue_Hmong Hmnp Wancho Wcho"},ft={};function mt(t){var e=ft[t]={binary:L(pt[t]+" "+ct),nonBinary:{General_Category:L(ct),Script:L(dt[t])}};e.nonBinary.Script_Extensions=e.nonBinary.Script,e.nonBinary.gc=e.nonBinary.General_Category,e.nonBinary.sc=e.nonBinary.Script,e.nonBinary.scx=e.nonBinary.Script_Extensions}mt(9),mt(10),mt(11);function gt(t){this.parser=t,this.validFlags="gim"+(6<=t.options.ecmaVersion?"uy":"")+(9<=t.options.ecmaVersion?"s":""),this.unicodeProperties=ft[11<=t.options.ecmaVersion?11:t.options.ecmaVersion],this.source="",this.flags="",this.start=0,this.switchU=!1,this.switchN=!1,this.pos=0,this.lastIntValue=0,this.lastStringValue="",this.lastAssertionIsQuantifiable=!1,this.numCapturingParens=0,this.maxBackReference=0,this.groupNames=[],this.backReferenceNames=[]}var xt=O.prototype;function yt(t){return t<=65535?String.fromCharCode(t):(t-=65536,String.fromCharCode(55296+(t>>10),56320+(1023&t)))}function vt(t){return 36===t||40<=t&&t<=43||46===t||63===t||91<=t&&t<=94||123<=t&&t<=125}function _t(t){return 65<=t&&t<=90||97<=t&&t<=122}function bt(t){return _t(t)||95===t}function kt(t){return 48<=t&&t<=57}function St(t){return 48<=t&&t<=57||65<=t&&t<=70||97<=t&&t<=102}function Ct(t){return 65<=t&&t<=70?t-65+10:97<=t&&t<=102?t-97+10:t-48}function wt(t){return 48<=t&&t<=55}gt.prototype.reset=function(t,e,i){var s=-1!==i.indexOf("u");this.start=0|t,this.source=e+"",this.flags=i,this.switchU=s&&6<=this.parser.options.ecmaVersion,this.switchN=s&&9<=this.parser.options.ecmaVersion},gt.prototype.raise=function(t){this.parser.raiseRecoverable(this.start,"Invalid regular expression: /"+this.source+"/: "+t)},gt.prototype.at=function(t){var e=this.source,i=e.length;if(i<=t)return-1;var s=e.charCodeAt(t);if(!this.switchU||s<=55295||57344<=s||i<=t+1)return s;var a=e.charCodeAt(t+1);return 56320<=a&&a<=57343?(s<<10)+a-56613888:s},gt.prototype.nextIndex=function(t){var e=this.source,i=e.length;if(i<=t)return i;var s,a=e.charCodeAt(t);return!this.switchU||a<=55295||57344<=a||i<=t+1||(s=e.charCodeAt(t+1))<56320||57343<s?t+1:t+2},gt.prototype.current=function(){return this.at(this.pos)},gt.prototype.lookahead=function(){return this.at(this.nextIndex(this.pos))},gt.prototype.advance=function(){this.pos=this.nextIndex(this.pos)},gt.prototype.eat=function(t){return this.current()===t&&(this.advance(),!0)},xt.validateRegExpFlags=function(t){for(var e=t.validFlags,i=t.flags,s=0;s<i.length;s++){var a=i.charAt(s);-1===e.indexOf(a)&&this.raise(t.start,"Invalid regular expression flag"),-1<i.indexOf(a,s+1)&&this.raise(t.start,"Duplicate regular expression flag")}},xt.validateRegExpPattern=function(t){this.regexp_pattern(t),!t.switchN&&9<=this.options.ecmaVersion&&0<t.groupNames.length&&(t.switchN=!0,this.regexp_pattern(t))},xt.regexp_pattern=function(t){t.pos=0,t.lastIntValue=0,t.lastStringValue="",t.lastAssertionIsQuantifiable=!1,t.numCapturingParens=0,t.maxBackReference=0,t.groupNames.length=0,t.backReferenceNames.length=0,this.regexp_disjunction(t),t.pos!==t.source.length&&(t.eat(41)&&t.raise("Unmatched ')'"),(t.eat(93)||t.eat(125))&&t.raise("Lone quantifier brackets")),t.maxBackReference>t.numCapturingParens&&t.raise("Invalid escape");for(var e=0,i=t.backReferenceNames;e<i.length;e+=1){var s=i[e];-1===t.groupNames.indexOf(s)&&t.raise("Invalid named capture referenced")}},xt.regexp_disjunction=function(t){for(this.regexp_alternative(t);t.eat(124);)this.regexp_alternative(t);this.regexp_eatQuantifier(t,!0)&&t.raise("Nothing to repeat"),t.eat(123)&&t.raise("Lone quantifier brackets")},xt.regexp_alternative=function(t){for(;t.pos<t.source.length&&this.regexp_eatTerm(t););},xt.regexp_eatTerm=function(t){return this.regexp_eatAssertion(t)?(t.lastAssertionIsQuantifiable&&this.regexp_eatQuantifier(t)&&t.switchU&&t.raise("Invalid quantifier"),!0):!(t.switchU?!this.regexp_eatAtom(t):!this.regexp_eatExtendedAtom(t))&&(this.regexp_eatQuantifier(t),!0)},xt.regexp_eatAssertion=function(t){var e=t.pos;if(t.lastAssertionIsQuantifiable=!1,t.eat(94)||t.eat(36))return!0;if(t.eat(92)){if(t.eat(66)||t.eat(98))return!0;t.pos=e}if(t.eat(40)&&t.eat(63)){var i=!1;if(9<=this.options.ecmaVersion&&(i=t.eat(60)),t.eat(61)||t.eat(33))return this.regexp_disjunction(t),t.eat(41)||t.raise("Unterminated group"),t.lastAssertionIsQuantifiable=!i,!0}return t.pos=e,!1},xt.regexp_eatQuantifier=function(t,e){return void 0===e&&(e=!1),!!this.regexp_eatQuantifierPrefix(t,e)&&(t.eat(63),!0)},xt.regexp_eatQuantifierPrefix=function(t,e){return t.eat(42)||t.eat(43)||t.eat(63)||this.regexp_eatBracedQuantifier(t,e)},xt.regexp_eatBracedQuantifier=function(t,e){var i=t.pos;if(t.eat(123)){var s=0,a=-1;if(this.regexp_eatDecimalDigits(t)&&(s=t.lastIntValue,t.eat(44)&&this.regexp_eatDecimalDigits(t)&&(a=t.lastIntValue),t.eat(125)))return-1!==a&&a<s&&!e&&t.raise("numbers out of order in {} quantifier"),!0;t.switchU&&!e&&t.raise("Incomplete quantifier"),t.pos=i}return!1},xt.regexp_eatAtom=function(t){return this.regexp_eatPatternCharacters(t)||t.eat(46)||this.regexp_eatReverseSolidusAtomEscape(t)||this.regexp_eatCharacterClass(t)||this.regexp_eatUncapturingGroup(t)||this.regexp_eatCapturingGroup(t)},xt.regexp_eatReverseSolidusAtomEscape=function(t){var e=t.pos;if(t.eat(92)){if(this.regexp_eatAtomEscape(t))return!0;t.pos=e}return!1},xt.regexp_eatUncapturingGroup=function(t){var e=t.pos;if(t.eat(40)){if(t.eat(63)&&t.eat(58)){if(this.regexp_disjunction(t),t.eat(41))return!0;t.raise("Unterminated group")}t.pos=e}return!1},xt.regexp_eatCapturingGroup=function(t){if(t.eat(40)){if(9<=this.options.ecmaVersion?this.regexp_groupSpecifier(t):63===t.current()&&t.raise("Invalid group"),this.regexp_disjunction(t),t.eat(41))return t.numCapturingParens+=1,!0;t.raise("Unterminated group")}return!1},xt.regexp_eatExtendedAtom=function(t){return t.eat(46)||this.regexp_eatReverseSolidusAtomEscape(t)||this.regexp_eatCharacterClass(t)||this.regexp_eatUncapturingGroup(t)||this.regexp_eatCapturingGroup(t)||this.regexp_eatInvalidBracedQuantifier(t)||this.regexp_eatExtendedPatternCharacter(t)},xt.regexp_eatInvalidBracedQuantifier=function(t){return this.regexp_eatBracedQuantifier(t,!0)&&t.raise("Nothing to repeat"),!1},xt.regexp_eatSyntaxCharacter=function(t){var e=t.current();return!!vt(e)&&(t.lastIntValue=e,t.advance(),!0)},xt.regexp_eatPatternCharacters=function(t){for(var e=t.pos,i=0;-1!==(i=t.current())&&!vt(i);)t.advance();return t.pos!==e},xt.regexp_eatExtendedPatternCharacter=function(t){var e=t.current();return!(-1===e||36===e||40<=e&&e<=43||46===e||63===e||91===e||94===e||124===e)&&(t.advance(),!0)},xt.regexp_groupSpecifier=function(t){if(t.eat(63)){if(this.regexp_eatGroupName(t))return-1!==t.groupNames.indexOf(t.lastStringValue)&&t.raise("Duplicate capture group name"),void t.groupNames.push(t.lastStringValue);t.raise("Invalid group")}},xt.regexp_eatGroupName=function(t){if(t.lastStringValue="",t.eat(60)){if(this.regexp_eatRegExpIdentifierName(t)&&t.eat(62))return!0;t.raise("Invalid capture group name")}return!1},xt.regexp_eatRegExpIdentifierName=function(t){if(t.lastStringValue="",this.regexp_eatRegExpIdentifierStart(t)){for(t.lastStringValue+=yt(t.lastIntValue);this.regexp_eatRegExpIdentifierPart(t);)t.lastStringValue+=yt(t.lastIntValue);return!0}return!1},xt.regexp_eatRegExpIdentifierStart=function(t){var e,i=t.pos,s=t.current();return t.advance(),92===s&&this.regexp_eatRegExpUnicodeEscapeSequence(t)&&(s=t.lastIntValue),l(e=s,!0)||36===e||95===e?(t.lastIntValue=s,!0):(t.pos=i,!1)},xt.regexp_eatRegExpIdentifierPart=function(t){var e,i=t.pos,s=t.current();return t.advance(),92===s&&this.regexp_eatRegExpUnicodeEscapeSequence(t)&&(s=t.lastIntValue),d(e=s,!0)||36===e||95===e||8204===e||8205===e?(t.lastIntValue=s,!0):(t.pos=i,!1)},xt.regexp_eatAtomEscape=function(t){return!!(this.regexp_eatBackReference(t)||this.regexp_eatCharacterClassEscape(t)||this.regexp_eatCharacterEscape(t)||t.switchN&&this.regexp_eatKGroupName(t))||(t.switchU&&(99===t.current()&&t.raise("Invalid unicode escape"),t.raise("Invalid escape")),!1)},xt.regexp_eatBackReference=function(t){var e=t.pos;if(this.regexp_eatDecimalEscape(t)){var i=t.lastIntValue;if(t.switchU)return i>t.maxBackReference&&(t.maxBackReference=i),!0;if(i<=t.numCapturingParens)return!0;t.pos=e}return!1},xt.regexp_eatKGroupName=function(t){if(t.eat(107)){if(this.regexp_eatGroupName(t))return t.backReferenceNames.push(t.lastStringValue),!0;t.raise("Invalid named reference")}return!1},xt.regexp_eatCharacterEscape=function(t){return this.regexp_eatControlEscape(t)||this.regexp_eatCControlLetter(t)||this.regexp_eatZero(t)||this.regexp_eatHexEscapeSequence(t)||this.regexp_eatRegExpUnicodeEscapeSequence(t)||!t.switchU&&this.regexp_eatLegacyOctalEscapeSequence(t)||this.regexp_eatIdentityEscape(t)},xt.regexp_eatCControlLetter=function(t){var e=t.pos;if(t.eat(99)){if(this.regexp_eatControlLetter(t))return!0;t.pos=e}return!1},xt.regexp_eatZero=function(t){return 48===t.current()&&!kt(t.lookahead())&&(t.lastIntValue=0,t.advance(),!0)},xt.regexp_eatControlEscape=function(t){var e=t.current();return 116===e?(t.lastIntValue=9,t.advance(),!0):110===e?(t.lastIntValue=10,t.advance(),!0):118===e?(t.lastIntValue=11,t.advance(),!0):102===e?(t.lastIntValue=12,t.advance(),!0):114===e&&(t.lastIntValue=13,t.advance(),!0)},xt.regexp_eatControlLetter=function(t){var e=t.current();return!!_t(e)&&(t.lastIntValue=e%32,t.advance(),!0)},xt.regexp_eatRegExpUnicodeEscapeSequence=function(t){var e,i=t.pos;if(t.eat(117)){if(this.regexp_eatFixedHexDigits(t,4)){var s=t.lastIntValue;if(t.switchU&&55296<=s&&s<=56319){var a=t.pos;if(t.eat(92)&&t.eat(117)&&this.regexp_eatFixedHexDigits(t,4)){var r=t.lastIntValue;if(56320<=r&&r<=57343)return t.lastIntValue=1024*(s-55296)+(r-56320)+65536,!0}t.pos=a,t.lastIntValue=s}return!0}if(t.switchU&&t.eat(123)&&this.regexp_eatHexDigits(t)&&t.eat(125)&&(0<=(e=t.lastIntValue)&&e<=1114111))return!0;t.switchU&&t.raise("Invalid unicode escape"),t.pos=i}return!1},xt.regexp_eatIdentityEscape=function(t){if(t.switchU)return!!this.regexp_eatSyntaxCharacter(t)||!!t.eat(47)&&(t.lastIntValue=47,!0);var e=t.current();return!(99===e||t.switchN&&107===e)&&(t.lastIntValue=e,t.advance(),!0)},xt.regexp_eatDecimalEscape=function(t){t.lastIntValue=0;var e=t.current();if(49<=e&&e<=57){for(;t.lastIntValue=10*t.lastIntValue+(e-48),t.advance(),48<=(e=t.current())&&e<=57;);return!0}return!1},xt.regexp_eatCharacterClassEscape=function(t){var e,i=t.current();if(100===(e=i)||68===e||115===e||83===e||119===e||87===e)return t.lastIntValue=-1,t.advance(),!0;if(t.switchU&&9<=this.options.ecmaVersion&&(80===i||112===i)){if(t.lastIntValue=-1,t.advance(),t.eat(123)&&this.regexp_eatUnicodePropertyValueExpression(t)&&t.eat(125))return!0;t.raise("Invalid property name")}return!1},xt.regexp_eatUnicodePropertyValueExpression=function(t){var e=t.pos;if(this.regexp_eatUnicodePropertyName(t)&&t.eat(61)){var i=t.lastStringValue;if(this.regexp_eatUnicodePropertyValue(t)){var s=t.lastStringValue;return this.regexp_validateUnicodePropertyNameAndValue(t,i,s),!0}}if(t.pos=e,this.regexp_eatLoneUnicodePropertyNameOrValue(t)){var a=t.lastStringValue;return this.regexp_validateUnicodePropertyNameOrValue(t,a),!0}return!1},xt.regexp_validateUnicodePropertyNameAndValue=function(t,e,i){P(t.unicodeProperties.nonBinary,e)||t.raise("Invalid property name"),t.unicodeProperties.nonBinary[e].test(i)||t.raise("Invalid property value")},xt.regexp_validateUnicodePropertyNameOrValue=function(t,e){t.unicodeProperties.binary.test(e)||t.raise("Invalid property name")},xt.regexp_eatUnicodePropertyName=function(t){var e=0;for(t.lastStringValue="";bt(e=t.current());)t.lastStringValue+=yt(e),t.advance();return""!==t.lastStringValue},xt.regexp_eatUnicodePropertyValue=function(t){var e,i=0;for(t.lastStringValue="";bt(e=i=t.current())||kt(e);)t.lastStringValue+=yt(i),t.advance();return""!==t.lastStringValue},xt.regexp_eatLoneUnicodePropertyNameOrValue=function(t){return this.regexp_eatUnicodePropertyValue(t)},xt.regexp_eatCharacterClass=function(t){if(t.eat(91)){if(t.eat(94),this.regexp_classRanges(t),t.eat(93))return!0;t.raise("Unterminated character class")}return!1},xt.regexp_classRanges=function(t){for(;this.regexp_eatClassAtom(t);){var e,i=t.lastIntValue;t.eat(45)&&this.regexp_eatClassAtom(t)&&(e=t.lastIntValue,!t.switchU||-1!==i&&-1!==e||t.raise("Invalid character class"),-1!==i&&-1!==e&&e<i&&t.raise("Range out of order in character class"))}},xt.regexp_eatClassAtom=function(t){var e,i=t.pos;if(t.eat(92)){if(this.regexp_eatClassEscape(t))return!0;t.switchU&&(99!==(e=t.current())&&!wt(e)||t.raise("Invalid class escape"),t.raise("Invalid escape")),t.pos=i}var s=t.current();return 93!==s&&(t.lastIntValue=s,t.advance(),!0)},xt.regexp_eatClassEscape=function(t){var e=t.pos;if(t.eat(98))return t.lastIntValue=8,!0;if(t.switchU&&t.eat(45))return t.lastIntValue=45,!0;if(!t.switchU&&t.eat(99)){if(this.regexp_eatClassControlLetter(t))return!0;t.pos=e}return this.regexp_eatCharacterClassEscape(t)||this.regexp_eatCharacterEscape(t)},xt.regexp_eatClassControlLetter=function(t){var e=t.current();return!(!kt(e)&&95!==e)&&(t.lastIntValue=e%32,t.advance(),!0)},xt.regexp_eatHexEscapeSequence=function(t){var e=t.pos;if(t.eat(120)){if(this.regexp_eatFixedHexDigits(t,2))return!0;t.switchU&&t.raise("Invalid escape"),t.pos=e}return!1},xt.regexp_eatDecimalDigits=function(t){var e=t.pos,i=0;for(t.lastIntValue=0;kt(i=t.current());)t.lastIntValue=10*t.lastIntValue+(i-48),t.advance();return t.pos!==e},xt.regexp_eatHexDigits=function(t){var e=t.pos,i=0;for(t.lastIntValue=0;St(i=t.current());)t.lastIntValue=16*t.lastIntValue+Ct(i),t.advance();return t.pos!==e},xt.regexp_eatLegacyOctalEscapeSequence=function(t){if(this.regexp_eatOctalDigit(t)){var e,i=t.lastIntValue;return this.regexp_eatOctalDigit(t)?(e=t.lastIntValue,i<=3&&this.regexp_eatOctalDigit(t)?t.lastIntValue=64*i+8*e+t.lastIntValue:t.lastIntValue=8*i+e):t.lastIntValue=i,!0}return!1},xt.regexp_eatOctalDigit=function(t){var e=t.current();return wt(e)?(t.lastIntValue=e-48,t.advance(),!0):(t.lastIntValue=0,!1)},xt.regexp_eatFixedHexDigits=function(t,e){for(var i=t.pos,s=t.lastIntValue=0;s<e;++s){var a=t.current();if(!St(a))return t.pos=i,!1;t.lastIntValue=16*t.lastIntValue+Ct(a),t.advance()}return!0};function Et(t){this.type=t.type,this.value=t.value,this.start=t.start,this.end=t.end,t.options.locations&&(this.loc=new V(t,t.startLoc,t.endLoc)),t.options.ranges&&(this.range=[t.start,t.end])}var At=O.prototype;function It(t){return t<=65535?String.fromCharCode(t):(t-=65536,String.fromCharCode(55296+(t>>10),56320+(1023&t)))}At.next=function(){this.options.onToken&&this.options.onToken(new Et(this)),this.lastTokEnd=this.end,this.lastTokStart=this.start,this.lastTokEndLoc=this.endLoc,this.lastTokStartLoc=this.startLoc,this.nextToken()},At.getToken=function(){return this.next(),new Et(this)},"undefined"!=typeof Symbol&&(At[Symbol.iterator]=function(){var e=this;return{next:function(){var t=e.getToken();return{done:t.type===_.eof,value:t}}}}),At.curContext=function(){return this.context[this.context.length-1]},At.nextToken=function(){var t=this.curContext();return t&&t.preserveSpace||this.skipSpace(),this.start=this.pos,this.options.locations&&(this.startLoc=this.curPosition()),this.pos>=this.input.length?this.finishToken(_.eof):t.override?t.override(this):void this.readToken(this.fullCharCodeAtPos())},At.readToken=function(t){return l(t,6<=this.options.ecmaVersion)||92===t?this.readWord():this.getTokenFromCode(t)},At.fullCharCodeAtPos=function(){var t=this.input.charCodeAt(this.pos);return t<=55295||57344<=t?t:(t<<10)+this.input.charCodeAt(this.pos+1)-56613888},At.skipBlockComment=function(){var t,e=this.options.onComment&&this.curPosition(),i=this.pos,s=this.input.indexOf("*/",this.pos+=2);if(-1===s&&this.raise(this.pos-2,"Unterminated comment"),this.pos=s+2,this.options.locations)for(k.lastIndex=i;(t=k.exec(this.input))&&t.index<this.pos;)++this.curLine,this.lineStart=t.index+t[0].length;this.options.onComment&&this.options.onComment(!0,this.input.slice(i+2,s),i,this.pos,e,this.curPosition())},At.skipLineComment=function(t){for(var e=this.pos,i=this.options.onComment&&this.curPosition(),s=this.input.charCodeAt(this.pos+=t);this.pos<this.input.length&&!S(s);)s=this.input.charCodeAt(++this.pos);this.options.onComment&&this.options.onComment(!1,this.input.slice(e+t,this.pos),e,this.pos,i,this.curPosition())},At.skipSpace=function(){t:for(;this.pos<this.input.length;){var t=this.input.charCodeAt(this.pos);switch(t){case 32:case 160:++this.pos;break;case 13:10===this.input.charCodeAt(this.pos+1)&&++this.pos;case 10:case 8232:case 8233:++this.pos,this.options.locations&&(++this.curLine,this.lineStart=this.pos);break;case 47:switch(this.input.charCodeAt(this.pos+1)){case 42:this.skipBlockComment();break;case 47:this.skipLineComment(2);break;default:break t}break;default:if(!(8<t&&t<14||5760<=t&&C.test(String.fromCharCode(t))))break t;++this.pos}}},At.finishToken=function(t,e){this.end=this.pos,this.options.locations&&(this.endLoc=this.curPosition());var i=this.type;this.type=t,this.value=e,this.updateContext(i)},At.readToken_dot=function(){var t=this.input.charCodeAt(this.pos+1);if(48<=t&&t<=57)return this.readNumber(!0);var e=this.input.charCodeAt(this.pos+2);return 6<=this.options.ecmaVersion&&46===t&&46===e?(this.pos+=3,this.finishToken(_.ellipsis)):(++this.pos,this.finishToken(_.dot))},At.readToken_slash=function(){var t=this.input.charCodeAt(this.pos+1);return this.exprAllowed?(++this.pos,this.readRegexp()):61===t?this.finishOp(_.assign,2):this.finishOp(_.slash,1)},At.readToken_mult_modulo_exp=function(t){var e=this.input.charCodeAt(this.pos+1),i=1,s=42===t?_.star:_.modulo;return 7<=this.options.ecmaVersion&&42===t&&42===e&&(++i,s=_.starstar,e=this.input.charCodeAt(this.pos+2)),61===e?this.finishOp(_.assign,i+1):this.finishOp(s,i)},At.readToken_pipe_amp=function(t){var e=this.input.charCodeAt(this.pos+1);return e===t?this.finishOp(124===t?_.logicalOR:_.logicalAND,2):61===e?this.finishOp(_.assign,2):this.finishOp(124===t?_.bitwiseOR:_.bitwiseAND,1)},At.readToken_caret=function(){return 61===this.input.charCodeAt(this.pos+1)?this.finishOp(_.assign,2):this.finishOp(_.bitwiseXOR,1)},At.readToken_plus_min=function(t){var e=this.input.charCodeAt(this.pos+1);return e===t?45!==e||this.inModule||62!==this.input.charCodeAt(this.pos+2)||0!==this.lastTokEnd&&!b.test(this.input.slice(this.lastTokEnd,this.pos))?this.finishOp(_.incDec,2):(this.skipLineComment(3),this.skipSpace(),this.nextToken()):61===e?this.finishOp(_.assign,2):this.finishOp(_.plusMin,1)},At.readToken_lt_gt=function(t){var e=this.input.charCodeAt(this.pos+1),i=1;return e===t?(i=62===t&&62===this.input.charCodeAt(this.pos+2)?3:2,61===this.input.charCodeAt(this.pos+i)?this.finishOp(_.assign,i+1):this.finishOp(_.bitShift,i)):33!==e||60!==t||this.inModule||45!==this.input.charCodeAt(this.pos+2)||45!==this.input.charCodeAt(this.pos+3)?(61===e&&(i=2),this.finishOp(_.relational,i)):(this.skipLineComment(4),this.skipSpace(),this.nextToken())},At.readToken_eq_excl=function(t){var e=this.input.charCodeAt(this.pos+1);return 61===e?this.finishOp(_.equality,61===this.input.charCodeAt(this.pos+2)?3:2):61===t&&62===e&&6<=this.options.ecmaVersion?(this.pos+=2,this.finishToken(_.arrow)):this.finishOp(61===t?_.eq:_.prefix,1)},At.getTokenFromCode=function(t){switch(t){case 46:return this.readToken_dot();case 40:return++this.pos,this.finishToken(_.parenL);case 41:return++this.pos,this.finishToken(_.parenR);case 59:return++this.pos,this.finishToken(_.semi);case 44:return++this.pos,this.finishToken(_.comma);case 91:return++this.pos,this.finishToken(_.bracketL);case 93:return++this.pos,this.finishToken(_.bracketR);case 123:return++this.pos,this.finishToken(_.braceL);case 125:return++this.pos,this.finishToken(_.braceR);case 58:return++this.pos,this.finishToken(_.colon);case 63:return++this.pos,this.finishToken(_.question);case 96:if(this.options.ecmaVersion<6)break;return++this.pos,this.finishToken(_.backQuote);case 48:var e=this.input.charCodeAt(this.pos+1);if(120===e||88===e)return this.readRadixNumber(16);if(6<=this.options.ecmaVersion){if(111===e||79===e)return this.readRadixNumber(8);if(98===e||66===e)return this.readRadixNumber(2)}case 49:case 50:case 51:case 52:case 53:case 54:case 55:case 56:case 57:return this.readNumber(!1);case 34:case 39:return this.readString(t);case 47:return this.readToken_slash();case 37:case 42:return this.readToken_mult_modulo_exp(t);case 124:case 38:return this.readToken_pipe_amp(t);case 94:return this.readToken_caret();case 43:case 45:return this.readToken_plus_min(t);case 60:case 62:return this.readToken_lt_gt(t);case 61:case 33:return this.readToken_eq_excl(t);case 126:return this.finishOp(_.prefix,1)}this.raise(this.pos,"Unexpected character '"+It(t)+"'")},At.finishOp=function(t,e){var i=this.input.slice(this.pos,this.pos+e);return this.pos+=e,this.finishToken(t,i)},At.readRegexp=function(){for(var t,e,i=this.pos;;){this.pos>=this.input.length&&this.raise(i,"Unterminated regular expression");var s=this.input.charAt(this.pos);if(b.test(s)&&this.raise(i,"Unterminated regular expression"),t)t=!1;else{if("["===s)e=!0;else if("]"===s&&e)e=!1;else if("/"===s&&!e)break;t="\\"===s}++this.pos}var a=this.input.slice(i,this.pos);++this.pos;var r=this.pos,n=this.readWord1();this.containsEsc&&this.unexpected(r);var o=this.regexpState||(this.regexpState=new gt(this));o.reset(i,a,n),this.validateRegExpFlags(o),this.validateRegExpPattern(o);var h=null;try{h=new RegExp(a,n)}catch(t){}return this.finishToken(_.regexp,{pattern:a,flags:n,value:h})},At.readInt=function(t,e){for(var i=this.pos,s=0,a=0,r=null==e?1/0:e;a<r;++a){var n=this.input.charCodeAt(this.pos),o=void 0;if(t<=(o=97<=n?n-97+10:65<=n?n-65+10:48<=n&&n<=57?n-48:1/0))break;++this.pos,s=s*t+o}return this.pos===i||null!=e&&this.pos-i!==e?null:s},At.readRadixNumber=function(t){var e=this.pos;this.pos+=2;var i=this.readInt(t);return null==i&&this.raise(this.start+2,"Expected number in radix "+t),11<=this.options.ecmaVersion&&110===this.input.charCodeAt(this.pos)?(i="undefined"!=typeof BigInt?BigInt(this.input.slice(e,this.pos)):null,++this.pos):l(this.fullCharCodeAtPos())&&this.raise(this.pos,"Identifier directly after number"),this.finishToken(_.num,i)},At.readNumber=function(t){var e=this.pos;t||null!==this.readInt(10)||this.raise(e,"Invalid number");var i=2<=this.pos-e&&48===this.input.charCodeAt(e);i&&this.strict&&this.raise(e,"Invalid number"),i&&/[89]/.test(this.input.slice(e,this.pos))&&(i=!1);var s=this.input.charCodeAt(this.pos);if(!i&&!t&&11<=this.options.ecmaVersion&&110===s){var a=this.input.slice(e,this.pos),r="undefined"!=typeof BigInt?BigInt(a):null;return++this.pos,l(this.fullCharCodeAtPos())&&this.raise(this.pos,"Identifier directly after number"),this.finishToken(_.num,r)}46!==s||i||(++this.pos,this.readInt(10),s=this.input.charCodeAt(this.pos)),69!==s&&101!==s||i||(43!==(s=this.input.charCodeAt(++this.pos))&&45!==s||++this.pos,null===this.readInt(10)&&this.raise(e,"Invalid number")),l(this.fullCharCodeAtPos())&&this.raise(this.pos,"Identifier directly after number");var n=this.input.slice(e,this.pos),o=i?parseInt(n,8):parseFloat(n);return this.finishToken(_.num,o)},At.readCodePoint=function(){var t,e;return 123===this.input.charCodeAt(this.pos)?(this.options.ecmaVersion<6&&this.unexpected(),t=++this.pos,e=this.readHexChar(this.input.indexOf("}",this.pos)-this.pos),++this.pos,1114111<e&&this.invalidStringToken(t,"Code point out of bounds")):e=this.readHexChar(4),e},At.readString=function(t){for(var e="",i=++this.pos;;){this.pos>=this.input.length&&this.raise(this.start,"Unterminated string constant");var s=this.input.charCodeAt(this.pos);if(s===t)break;92===s?(e+=this.input.slice(i,this.pos),e+=this.readEscapedChar(!1),i=this.pos):(S(s,10<=this.options.ecmaVersion)&&this.raise(this.start,"Unterminated string constant"),++this.pos)}return e+=this.input.slice(i,this.pos++),this.finishToken(_.string,e)};var Pt={};At.tryReadTemplateToken=function(){this.inTemplateElement=!0;try{this.readTmplToken()}catch(t){if(t!==Pt)throw t;this.readInvalidTemplateToken()}this.inTemplateElement=!1},At.invalidStringToken=function(t,e){if(this.inTemplateElement&&9<=this.options.ecmaVersion)throw Pt;this.raise(t,e)},At.readTmplToken=function(){for(var t="",e=this.pos;;){this.pos>=this.input.length&&this.raise(this.start,"Unterminated template");var i=this.input.charCodeAt(this.pos);if(96===i||36===i&&123===this.input.charCodeAt(this.pos+1))return this.pos!==this.start||this.type!==_.template&&this.type!==_.invalidTemplate?(t+=this.input.slice(e,this.pos),this.finishToken(_.template,t)):36===i?(this.pos+=2,this.finishToken(_.dollarBraceL)):(++this.pos,this.finishToken(_.backQuote));if(92===i)t+=this.input.slice(e,this.pos),t+=this.readEscapedChar(!0),e=this.pos;else if(S(i)){switch(t+=this.input.slice(e,this.pos),++this.pos,i){case 13:10===this.input.charCodeAt(this.pos)&&++this.pos;case 10:t+="\n";break;default:t+=String.fromCharCode(i)}this.options.locations&&(++this.curLine,this.lineStart=this.pos),e=this.pos}else++this.pos}},At.readInvalidTemplateToken=function(){for(;this.pos<this.input.length;this.pos++)switch(this.input[this.pos]){case"\\":++this.pos;break;case"$":if("{"!==this.input[this.pos+1])break;case"`":return this.finishToken(_.invalidTemplate,this.input.slice(this.start,this.pos))}this.raise(this.start,"Unterminated template")},At.readEscapedChar=function(t){var e=this.input.charCodeAt(++this.pos);switch(++this.pos,e){case 110:return"\n";case 114:return"\r";case 120:return String.fromCharCode(this.readHexChar(2));case 117:return It(this.readCodePoint());case 116:return"\t";case 98:return"\b";case 118:return"\v";case 102:return"\f";case 13:10===this.input.charCodeAt(this.pos)&&++this.pos;case 10:return this.options.locations&&(this.lineStart=this.pos,++this.curLine),"";default:if(48<=e&&e<=55){var i=this.input.substr(this.pos-1,3).match(/^[0-7]+/)[0],s=parseInt(i,8);return 255<s&&(i=i.slice(0,-1),s=parseInt(i,8)),this.pos+=i.length-1,e=this.input.charCodeAt(this.pos),"0"===i&&56!==e&&57!==e||!this.strict&&!t||this.invalidStringToken(this.pos-1-i.length,t?"Octal literal in template string":"Octal literal in strict mode"),String.fromCharCode(s)}return S(e)?"":String.fromCharCode(e)}},At.readHexChar=function(t){var e=this.pos,i=this.readInt(16,t);return null===i&&this.invalidStringToken(e,"Bad character escape sequence"),i},At.readWord1=function(){for(var t="",e=!(this.containsEsc=!1),i=this.pos,s=6<=this.options.ecmaVersion;this.pos<this.input.length;){var a=this.fullCharCodeAtPos();if(d(a,s))this.pos+=a<=65535?1:2;else{if(92!==a)break;this.containsEsc=!0,t+=this.input.slice(i,this.pos);var r=this.pos;117!==this.input.charCodeAt(++this.pos)&&this.invalidStringToken(this.pos,"Expecting Unicode escape sequence \\uXXXX"),++this.pos;var n=this.readCodePoint();(e?l:d)(n,s)||this.invalidStringToken(r,"Invalid Unicode escape"),t+=It(n),i=this.pos}e=!1}return t+this.input.slice(i,this.pos)},At.readWord=function(){var t=this.readWord1(),e=_.name;return this.keywords.test(t)&&(this.containsEsc&&this.raiseRecoverable(this.start,"Escape sequence in keyword "+t),e=y[t]),this.finishToken(e,t)};O.acorn={Parser:O,version:"6.4.2",defaultOptions:B,Position:N,SourceLocation:V,getLineInfo:R,Node:et,TokenType:f,tokTypes:_,keywordTypes:y,TokContext:at,tokContexts:rt,isIdentifierChar:d,isIdentifierStart:l,Token:Et,isNewLine:S,lineBreak:b,lineBreakG:k,nonASCIIwhitespace:C},t.Node=et,t.Parser=O,t.Position=N,t.SourceLocation=V,t.TokContext=at,t.Token=Et,t.TokenType=f,t.defaultOptions=B,t.getLineInfo=R,t.isIdentifierChar=d,t.isIdentifierStart=l,t.isNewLine=S,t.keywordTypes=y,t.lineBreak=b,t.lineBreakG=k,t.nonASCIIwhitespace=C,t.parse=function(t,e){return O.parse(t,e)},t.parseExpressionAt=function(t,e,i){return O.parseExpressionAt(t,e,i)},t.tokContexts=rt,t.tokTypes=_,t.tokenizer=function(t,e){return O.tokenizer(t,e)},t.version="6.4.2",Object.defineProperty(t,"__esModule",{value:!0})});
\ No newline at end of file
diff --git a/lib/build.js b/lib/build.js
index 47f07e732..8b75ba88e 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -1,9 +1,3 @@
-// TODO
-/*
-allow merging of modules
-check all missing files before compilation
-filter duplicates before generating .S file
-*/
 const { print, error, builtin } = just
 const { launch, watch } = just.process
 const { cwd } = just.sys
@@ -168,7 +162,22 @@ async function run (config = {}, { cleanall = false, clean = false, dump = false
   for (const fileName of runtime.embeds) {
     links[fileName] = linkFile(fileName, fileName)
   }
-  if (config.target !== 'just') {
+  if (config.target === 'just') {
+    for (const fileName of config.libs) {
+      if (isFile(`${appDir}/${fileName}`)) {
+        links[fileName] = linkFile(fileName, fileName)
+      } else {
+        links[fileName] = linkFile(`${justDir}/${fileName}`, fileName)
+      }
+    }
+    for (const fileName of config.embeds) {
+      if (isFile(`${appDir}/${fileName}`)) {
+        links[fileName] = linkFile(fileName, fileName)
+      } else {
+        links[fileName] = linkFile(`${justDir}/${fileName}`, fileName)
+      }
+    }
+  } else {
     for (const fileName of config.libs) {
       if (fileName[0] === '/') {
         links[fileName] = linkFile(fileName, fileName.replace(`${justDir}/`, ''))
@@ -294,6 +303,7 @@ function init (name) {
 
 function clean () {
   // we don't want to do this for main build
+  // todo unlink linker file
   unlink('Makefile')
   unlink('just.js')
   unlink('just.cc')
@@ -311,6 +321,8 @@ function clean () {
     unlink('lib/process.js')
     unlink('lib/repl.js')
     unlink('lib/websocket.js')
+    unlink('lib/acorn.js')
+    unlink('lib/configure.js')
     const files = readDir('lib').filter(f => !(['.', '..'].indexOf(f.name) > -1))
     if (files.length === 0) {
       rmrf('lib')
diff --git a/lib/configure.js b/lib/configure.js
new file mode 100644
index 000000000..0037a4773
--- /dev/null
+++ b/lib/configure.js
@@ -0,0 +1,232 @@
+const { baseName, fileName, join } = just.path
+const acorn = require('acorn')
+const { isFile, isDir } = require('fs')
+const { launch } = just.process
+const appRoot = just.sys.cwd()
+const cache = createCache()
+const appDir = just.sys.cwd()
+let config
+const moduleCache = {}
+let { HOME, JUST_TARGET, JUST_HOME } = just.env()
+if (!JUST_TARGET) {
+  JUST_TARGET = `${HOME}/.just`
+}
+if (!JUST_HOME) {
+  JUST_HOME = JUST_TARGET
+}
+
+function requireText (text) {
+  const { vm } = just
+  const params = ['exports', 'require', 'module']
+  const exports = {}
+  const module = { exports, type: 'native' }
+  module.text = text
+  if (!module.text) return
+  const fun = vm.compile(module.text, just.sys.cwd(), params, [])
+  module.function = fun
+  fun.call(exports, exports, p => just.require(p, module), module)
+  return module.exports
+}
+
+function createCache () {
+  const libs = new Set()
+  const natives = new Set()
+  const modules = new Set()
+  const external = new Set()
+  return { main: '', index: '', libs, natives, modules, external }
+}
+
+function make (...args) {
+  const currentDir = just.sys.cwd()
+  const process = launch('make', ['C=gcc', 'CC=g++', ...args], currentDir)
+  process.onStdout = (buf, len) => {}
+  process.onStderr = (buf, len) => {}
+  return process
+}
+
+function getExternalLibrary (originalFileName, fileName) {
+  if (config.external[originalFileName]) {
+    just.print(`${originalFileName} found in config`)
+  } else {
+    const libsDir = `${JUST_TARGET}/lib`
+    if (!isDir(libsDir)) {
+      just.fs.chdir(JUST_TARGET)
+      const process = make('libs')
+      while (1) {
+        const [status, kpid] = just.sys.waitpid(new Uint32Array(2), process.pid)
+        if (kpid === process.pid) {
+          if (status !== 0) throw new Error(`make failed ${status}`)
+          break
+        }
+      }
+      just.fs.chdir(appDir)
+    }
+    const moduleDir = `${JUST_TARGET}/lib/${originalFileName}`
+    if (!isDir(moduleDir)) {
+      throw new Error(`module not found ${moduleDir}`)
+    }
+    fileName = `${moduleDir}/${originalFileName}.js`
+  }
+  return fileName
+}
+
+function getModule (fileName, libName) {
+  const modulesDir = `${JUST_TARGET}/modules`
+  if (!isDir(modulesDir)) {
+    just.fs.chdir(JUST_TARGET)
+    const process = make('modules')
+    while (1) {
+      const [status, kpid] = just.sys.waitpid(new Uint32Array(2), process.pid)
+      if (kpid === process.pid) {
+        if (status !== 0) throw new Error(`make failed ${status}`)
+        break
+      }
+    }
+    just.fs.chdir(appDir)
+  }
+  let moduleDir = `${JUST_TARGET}/modules/${fileName}`
+  if (libName) {
+    libName = libName.replace('.so', '')
+    moduleDir = `${JUST_TARGET}/modules/${libName}`
+  } else {
+    libName = fileName
+  }
+  if (!isDir(moduleDir)) {
+    throw new Error(`Module ${moduleDir} Not Found`)
+  }
+  const json = require(`${moduleDir}/${libName}.json`)
+  const entry = moduleCache[libName] || { name: libName }
+  if (json) {
+    if (json.exports) {
+      const lib = json.exports.filter(l => l.name === fileName)[0]
+      if (!entry.exports) entry.exports = []
+      const exists = entry.exports.filter(l => l.name === fileName)
+      if (!exists.length) {
+        const exp = { name: fileName, obj: [] }
+        lib.obj.forEach(o => {
+          exp.obj.push(`modules/${libName}/${o}`)
+        })
+        entry.exports.push(exp)
+      }
+    } else {
+      if (!moduleCache[libName]) {
+        if (!entry.obj) entry.obj = []
+        entry.obj.push(`modules/${libName}/${fileName}.o`)
+        for (const obj of json.obj) {
+          entry.obj.push(`modules/${libName}/${obj}`)
+        }
+      }
+    }
+    entry.lib = json.lib
+  } else {
+    if (!moduleCache[libName]) {
+      if (!entry.obj) entry.obj = []
+      entry.obj.push(`modules/${libName}/${fileName}.o`)
+    }
+  }
+  cache.modules.add(libName)
+  moduleCache[libName] = entry
+}
+
+function parse (fileName, type = 'script') {
+  const originalFileName = fileName
+  if (fileName[0] === '@') {
+    cache.external.add(fileName.slice(1))
+    fileName = `${appRoot}/lib/${fileName.slice(1)}/${just.path.fileName(fileName.slice(1))}.js`
+    fileName = getExternalLibrary(originalFileName.slice(1), fileName)
+  }
+  const parent = `${baseName(fileName)}`
+  if (type === 'module' && fileName.indexOf('.') === -1) {
+    cache.natives.add(just.path.fileName(fileName))
+    return
+  }
+  if (!isFile(fileName)) {
+    just.error(`Warning ${fileName} not found`)
+    return
+  }
+  if (type === 'script') {
+    cache.index = fileName
+  }
+  if (type === 'module') {
+    cache.libs.add(fileName.replace(`${appRoot}/`, '').replace(`${JUST_TARGET}/`, ''))
+  }
+  const src = just.fs.readFile(fileName)
+  acorn.parse(src, {
+    ecmaVersion: 2020,
+    sourceType: type,
+    onToken: token => {
+      if (token.value === 'require') {
+        const expr = acorn.parseExpressionAt(src, token.start)
+        if (expr.type === 'CallExpression') {
+          if (expr.arguments[0].type === 'Literal') {
+            let fileName = expr.arguments[0].value
+            if (fileName[0] !== '@') {
+              const ext = fileName.split('.').slice(-1)[0]
+              if (ext === 'js' || ext === 'json') {
+                fileName = join(parent, fileName)
+              }
+            }
+            parse(fileName, 'module')
+          }
+        }
+        return
+      }
+      if (token.value === 'library') {
+        const expr = acorn.parseExpressionAt(src, token.start)
+        if (expr.type === 'CallExpression') {
+          const [fileName, libName] = expr.arguments
+          if (libName) {
+            if (fileName.type === 'Literal' && libName.type === 'Literal') {
+              getModule(fileName.value, libName.value)
+            }
+          } else {
+            if (fileName.type === 'Literal') {
+              getModule(fileName.value)
+            }
+          }
+        }
+      }
+    }
+  })
+  return cache
+}
+
+function configure (scriptName, opts = {}) {
+  if (!scriptName) throw new Error('Please Supply a Script name')
+  const fn = fileName(scriptName)
+  const appName = fn.slice(0, fn.lastIndexOf('.'))
+  const builtin = requireText(just.builtin('config.js')) || {}
+  config = require(`${appName}.config.json`) || require(`${appName}.config.js`)
+  if (!config) {
+    config = require('config.js')
+    if (!config) {
+      config = JSON.parse(JSON.stringify(builtin))
+    }
+    config.embeds = []
+  }
+  for (const module of builtin.modules) {
+    moduleCache[module.name] = module
+  }
+  if (!config.external) config.external = {}
+  const { index, libs, modules } = parse(scriptName)
+  const builtinModules = config.modules.map(v => v.name)
+  if (!config.target || config.target === 'just') {
+    config.target = appName
+  }
+  const cfg = {
+    version: config.version || builtin.version,
+    v8flags: config.v8flags || builtin.v8flags,
+    debug: config.debug || builtin.debug,
+    capabilities: config.capabilities || builtin.capabilities,
+    target: config.target,
+    main: config.main,
+    static: opts.static || config.static,
+    index,
+    libs: Array.from(libs.keys()),
+    modules: [...new Set([...builtinModules, ...Array.from(modules.keys())])].map(k => moduleCache[k]),
+    embeds: config.embeds || []
+  }
+  return cfg
+}
+
+module.exports = { configure }
diff --git a/main.h b/main.h
index 7d0c5744f..24c60dde6 100644
--- a/main.h
+++ b/main.h
@@ -10,6 +10,10 @@ extern char _binary_lib_build_js_start[];
 extern char _binary_lib_build_js_end[];
 extern char _binary_lib_repl_js_start[];
 extern char _binary_lib_repl_js_end[];
+extern char _binary_lib_configure_js_start[];
+extern char _binary_lib_configure_js_end[];
+extern char _binary_lib_acorn_js_start[];
+extern char _binary_lib_acorn_js_end[];
 extern char _binary_just_cc_start[];
 extern char _binary_just_cc_end[];
 extern char _binary_Makefile_start[];
@@ -40,6 +44,8 @@ void register_builtins() {
   just::builtins_add("lib/process.js", _binary_lib_process_js_start, _binary_lib_process_js_end - _binary_lib_process_js_start);
   just::builtins_add("lib/build.js", _binary_lib_build_js_start, _binary_lib_build_js_end - _binary_lib_build_js_start);
   just::builtins_add("lib/repl.js", _binary_lib_repl_js_start, _binary_lib_repl_js_end - _binary_lib_repl_js_start);
+  just::builtins_add("lib/configure.js", _binary_lib_configure_js_start, _binary_lib_configure_js_end - _binary_lib_configure_js_start);
+  just::builtins_add("lib/acorn.js", _binary_lib_acorn_js_start, _binary_lib_acorn_js_end - _binary_lib_acorn_js_start);
   just::builtins_add("just.cc", _binary_just_cc_start, _binary_just_cc_end - _binary_just_cc_start);
   just::builtins_add("Makefile", _binary_Makefile_start, _binary_Makefile_end - _binary_Makefile_start);
   just::builtins_add("main.cc", _binary_main_cc_start, _binary_main_cc_end - _binary_main_cc_start);