Added check for surplus dependency.

__tests__/__snapshots__/index.js.snap

@@ -1,5 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`#transform should not try to parse with the surplus compiler 1`] = `"received is not a function"`;
+
 exports[`#transform should transform the jsx in input.js 1`] = `
 "\\"use strict\\";
 

__tests__/index.js

@@ -26,14 +26,34 @@ describe('#initialization', () => {
 describe('#transform', () => {
   const Bundler = require('parcel-bundler')
   const surplusPlugin = require('../index')
-  let bundler = new Bundler(inputPath, {
-    watch: false
-  })
-  surplusPlugin(bundler)
 
   it('should transform the jsx in input.js', async () => {
     expect.assertions(1)
+
+    let bundler = new Bundler(inputPath, {
+      watch: false
+    })
+
+    surplusPlugin(bundler)
+
     const result = await bundler.bundle()
+
     expect(result.entryAsset.generated.js.trim()).toMatchSnapshot()
   })
+
+  it('should not try to parse with the surplus compiler', async () => {
+    expect.assertions(1)
+
+    let bundler = new Bundler(`${__dirname}/samples/no-surplus-view.js`, {
+      watch: false
+    })
+
+    surplusPlugin(bundler)
+
+    try {
+      await bundler.bundle()
+    } catch (e) {
+      expect(e).toThrowErrorMatchingSnapshot()
+    }
+  })
 })

__tests__/samples/no-surplus-view.js

@@ -0,0 +1,6 @@
+// It should not try to parse with the surplus compiler
+const view = (
+  <div>
+    <h2>Surplus</h2>
+  </div>
+)

lib/js-asset.js

@@ -1,9 +1,21 @@
 const Asset = require('parcel-bundler/src/assets/JSAsset')
 const SourceMap = require('parcel-bundler/src/SourceMap')
 const compiler = require('surplus/compiler')
+const DepsRegex = require('deps-regex')
+
+const re = new DepsRegex({
+  matchInternal: true,
+  matchES6: true
+})
+
+const isUsingSurplus = contents => re.getDependencies(contents).find(d => d === 'surplus')
 
 class JSAsset extends Asset {
   async pretransform () {
+    if (!isUsingSurplus(this.contents)) {
+      return super.pretransform()
+    }
+
     if (this.options.sourceMaps) {
       const { src, map } = compiler.compile(this.contents, {
         sourcemap: 'extract',

package.json

@@ -43,11 +43,14 @@
     "surplus": "^0.5.2"
   },
   "devDependencies": {
-    "@geut/chan": "^1.3.0-1",
-    "jest": "^23.4.0",
-    "parcel-bundler": "^1.9.7",
+    "@geut/chan": "^2.0.0",
+    "jest": "^24.8.0",
+    "parcel-bundler": "^1.12.3",
     "s-js": "^0.4.7",
-    "standard": "^11.0.1",
+    "standard": "^12.0.1",
     "surplus": "^0.5.2"
+  },
+  "dependencies": {
+    "deps-regex": "^0.1.4"
   }
 }