diff --git a/.gitignore b/.gitignore
index 4fedc91..44c6b2e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,5 @@ typings/
 # dotenv environment variables file
 .env
 
+# Intellij
+.idea
\ No newline at end of file
diff --git a/dist/src/message-builder.d.ts b/dist/src/message-builder.d.ts
index f154c94..7d0d6e2 100644
--- a/dist/src/message-builder.d.ts
+++ b/dist/src/message-builder.d.ts
@@ -33,4 +33,4 @@
  *
  */
 import { Message } from './message-constants';
-export declare function getMessage(msg: Message, isAck: boolean): Buffer;
+export declare function getMessage(message: Message, isAck: boolean): Buffer;
diff --git a/dist/src/message-builder.js b/dist/src/message-builder.js
index 63b0c5e..3a5017d 100644
--- a/dist/src/message-builder.js
+++ b/dist/src/message-builder.js
@@ -38,16 +38,16 @@ const message_constants_1 = require("./message-constants");
 const utils_1 = require("./utils");
 const constants_1 = require("./constants");
 const message_validator_1 = require("./message-validator");
-function getMessage(msg, isAck) {
-    const message = msg;
+function getMessage(message, isAck) {
     let action = message.action;
     // convert action to write ack if necessary
     if (message.isWriteAck && !utils_1.isWriteAck(message.action)) {
         action = utils_1.ACTION_TO_WRITE_ACK[message.action];
     }
+    const actionTopic = message_constants_1.ACTIONS[message.topic];
     if (message.isAck || isAck) {
         action |= 0x80;
-        if (message_constants_1.ACTIONS[message.topic][message.action] === undefined) {
+        if (!actionTopic || actionTopic[message.action] === undefined) {
             throw new Error(`message ${message_constants_1.TOPIC[message.topic]} ${message.action} should not have an ack`);
         }
     }
@@ -60,7 +60,7 @@ function getMessage(msg, isAck) {
     }
     const metaError = message_validator_1.validateMeta(message.topic, action, meta);
     if (metaError) {
-        throw new Error(`invalid ${message_constants_1.TOPIC[message.topic]} ${message_constants_1.ACTIONS[message.topic][action] || action}: ${metaError}`);
+        throw new Error(`invalid ${message_constants_1.TOPIC[message.topic]} ${actionTopic[action] || action}: ${metaError}`);
     }
     const metaStr = JSON.stringify(meta);
     const metaBuff = metaStr === '{}' ? null : Buffer.from(metaStr, 'utf8');
diff --git a/dist/src/message-builder.js.map b/dist/src/message-builder.js.map
index 6d6b32b..ed429d0 100644
--- a/dist/src/message-builder.js.map
+++ b/dist/src/message-builder.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"message-builder.js","sourceRoot":"","sources":["../../src/message-builder.ts"],"names":[],"mappings":";AAAA;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GAgCG;AACH,+BAA+B;;AAE/B,2DAQ4B;AAE5B,mCAGgB;AAEhB,2CAGoB;AAEpB,2DAG4B;AAE5B,oBAA4B,OAAgB,EAAE,KAAc;IAC1D,IAAI,MAAM,GAAG,OAAO,CAAC,MAAM,CAAA;IAE3B,2CAA2C;IAC3C,EAAE,CAAC,CAAC,OAAO,CAAC,UAAU,IAAI,CAAC,kBAAU,CAAC,OAAO,CAAC,MAAwB,CAAC,CAAC,CAAC,CAAC;QACxE,MAAM,GAAG,2BAAmB,CAAC,OAAO,CAAC,MAAM,CAAC,CAAA;IAC9C,CAAC;IAED,MAAM,WAAW,GAAG,2BAAO,CAAC,OAAO,CAAC,KAAK,CAAC,CAAA;IAE1C,EAAE,CAAC,CAAC,OAAO,CAAC,KAAK,IAAI,KAAK,CAAC,CAAC,CAAC;QAC3B,MAAM,IAAI,IAAI,CAAA;QACd,EAAE,CAAC,CAAC,CAAC,WAAW,IAAI,WAAW,CAAC,OAAO,CAAC,MAAM,CAAC,KAAK,SAAS,CAAC,CAAC,CAAC;YAC9D,MAAM,IAAI,KAAK,CAAC,WAAW,yBAAK,CAAC,OAAO,CAAC,KAAK,CAAC,IAAI,OAAO,CAAC,MAAM,yBAAyB,CAAC,CAAA;QAC7F,CAAC;IACH,CAAC;IAED,MAAM,IAAI,GAAG,MAAM,CAAC,MAAM,CAAC,IAAI,CAAC,CAAA;IAChC,GAAG,CAAC,CAAC,MAAM,GAAG,IAAI,6BAAS,CAAC,CAAC,CAAC;QAC5B,IAAI,CAAC,6BAAS,CAAC,GAAG,CAAC,CAAC,GAAG,OAAO,CAAC,GAAG,CAAC,CAAA;IACrC,CAAC;IACD,EAAE,CAAC,CAAC,IAAI,CAAC,6BAAS,CAAC,eAAe,CAAC,KAAK,oCAAgB,CAAC,IAAI,CAAC,CAAC,CAAC;QAC9D,OAAO,IAAI,CAAC,6BAAS,CAAC,eAAe,CAAC,CAAA;IACxC,CAAC;IAED,MAAM,SAAS,GAAG,gCAAY,CAAC,OAAO,CAAC,KAAK,EAAE,MAAM,EAAE,IAAI,CAAC,CAAA;IAC3D,EAAE,CAAC,CAAC,SAAS,CAAC,CAAC,CAAC;QACd,MAAM,IAAI,KAAK,CAAC,WAAW,yBAAK,CAAC,OAAO,CAAC,KAAK,CAAC,IAAI,WAAW,CAAC,MAAM,CAAC,IAAI,MAAM,KAAK,SAAS,EAAE,CAAC,CAAA;IACnG,CAAC;IAED,MAAM,OAAO,GAAG,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,CAAA;IACpC,MAAM,QAAQ,GAAG,OAAO,KAAK,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,MAAM,CAAC,IAAI,CAAC,OAAO,EAAE,MAAM,CAAC,CAAA;IAEvE,IAAI,WAA0B,CAAA;IAC9B,EAAE,CAAC,CAAC,OAAO,CAAC,IAAI,YAAY,MAAM,CAAC,CAAC,CAAC;QACnC,WAAW,GAAG,OAAO,CAAC,IAAI,CAAA;IAC5B,CAAC;IAAC,IAAI,CAAC,EAAE,CAAC,CAAC,OAAO,CAAC,IAAI,KAAK,SAAS,IAAI,OAAO,CAAC,UAAU,KAAK,SAAS,CAAC,CAAC,CAAC;QAC1E,IAAI,UAAU,GAAG,OAAO,CAAC,IAAI,CAAA;QAC7B,EAAE,CAAC,CAAC,UAAU,KAAK,SAAS,CAAC,CAAC,CAAC;YAC7B,UAAU,GAAG,IAAI,CAAC,SAAS,CAAC,OAAO,CAAC,UAAU,CAAC,CAAA;QACjD,CAAC;QACD,WAAW,GAAG,MAAM,CAAC,IAAI,CAAC,UAAU,EAAE,MAAM,CAAC,CAAA;IAC/C,CAAC;IAAC,IAAI,CAAC,CAAC;QACN,WAAW,GAAG,IAAI,CAAA;IACpB,CAAC;IAED,EAAE,CAAC,CAAC,WAAW,IAAI,CAAC,8BAAU,CAAC,OAAO,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC,CAAC,CAAC;QACtD,OAAO,CAAC,KAAK,CAAC,mBAAmB,yBAAK,CAAC,OAAO,CAAC,KAAK,CAAC,IAAI,OAAO,CAAC,MAAM,2BAA2B,CAAC,CAAA;IACrG,CAAC;IAED,MAAM,cAAc,GAAG,QAAQ,CAAC,CAAC,CAAC,QAAQ,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAA;IACrD,MAAM,iBAAiB,GAAG,WAAW,CAAC,CAAC,CAAC,WAAW,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAA;IAE9D,EAAE,CAAC,CAAC,cAAc,IAAI,wCAA4B;WAC7C,iBAAiB,IAAI,wCAC1B,CAAC,CAAC,CAAC;QACD,MAAM,CAAC,QAAQ,CAAC,IAAI,EAAE,OAAO,CAAC,KAAK,EAAE,MAAM,EAAE,QAAQ,EAAE,WAAW,CAAC,CAAA;IACrE,CAAC;IAAC,IAAI,CAAC,CAAC;QACN,MAAM,CAAC,cAAc,CAAC,OAAO,CAAC,KAAK,EAAE,MAAM,EAAE,QAAQ,EAAE,WAAW,CAAC,CAAA;IACrE,CAAC;AACH,CAAC;AA5DD,gCA4DC;AAED,wBAAyB,KAAY,EAAE,MAAmB,EAAE,IAAmB,EAAE,OAAsB;IACrG,MAAM,UAAU,GAAG,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAA;IACzC,MAAM,aAAa,GAAG,OAAO,CAAC,CAAC,CAAC,OAAO,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAA;IAClD,MAAM,YAAY,GAAkB,EAAE,CAAA;IACtC,IAAI,iBAAiB,GAAG,CAAC,CAAA;IACzB,IAAI,oBAAoB,GAAG,CAAC,CAAA;IAC5B,IAAI,GAAY,CAAA;IAChB,GAAG,CAAC;QACF,MAAM,iBAAiB,GAAG,IAAI,CAAC,GAAG,CAChC,UAAU,GAAG,iBAAiB,EAC9B,wCAA4B,CAC7B,CAAA;QACD,MAAM,oBAAoB,GAAG,IAAI,CAAC,GAAG,CACnC,aAAa,GAAG,oBAAoB,EACpC,wCAA4B,CAC7B,CAAA;QAED,MAAM,WAAW,GAAG,IAAI,IAAI,IAAI,CAAC,KAAK,CACpC,iBAAiB,EACjB,iBAAiB,GAAG,iBAAiB,CACtC,CAAA;QACD,MAAM,cAAc,GAAG,OAAO,IAAI,OAAO,CAAC,KAAK,CAC7C,oBAAoB,EACpB,oBAAoB,GAAG,oBAAoB,CAC5C,CAAA;QAED,iBAAiB,IAAI,iBAAiB,CAAA;QACtC,oBAAoB,IAAI,oBAAoB,CAAA;QAE5C,GAAG,GAAG,iBAAiB,KAAK,UAAU,IAAI,oBAAoB,KAAK,aAAa,CAAA;QAEhF,YAAY,CAAC,IAAI,CACf,QAAQ,CAAC,GAAG,EAAE,KAAK,EAAE,MAAM,EAAE,WAAW,EAAE,cAAc,CAAC,CAC1D,CAAA;IACH,CAAC,QAAQ,CAAC,GAAG,EAAC;IACd,MAAM,CAAC,MAAM,CAAC,MAAM,CAAC,YAAY,CAAC,CAAA;AACpC,CAAC;AAED,kBAAmB,GAAY,EAAE,KAAY,EAAE,MAAmB,EAAE,IAAmB,EAAE,OAAsB;IAC7G,MAAM,UAAU,GAAG,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAA;IACzC,MAAM,aAAa,GAAG,OAAO,CAAC,CAAC,CAAC,OAAO,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAA;IAClD,MAAM,mBAAmB,GAAG,yBAAa,GAAG,UAAU,GAAG,aAAa,CAAA;IACtE,MAAM,aAAa,GAAW,MAAM,CAAC,WAAW,CAAC,mBAAmB,CAAC,CAAA;IAErE,aAAa,CAAC,CAAC,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,GAAG,KAAK,CAAA;IAC9C,aAAa,CAAC,CAAC,CAAC,GAAG,MAAM,CAAA;IACzB,aAAa,CAAC,WAAW,CAAC,UAAU,EAAE,CAAC,EAAE,CAAC,CAAC,CAAA;IAC3C,aAAa,CAAC,WAAW,CAAC,aAAa,EAAE,CAAC,EAAE,CAAC,CAAC,CAAA;IAE9C,EAAE,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC;QACT,IAAI,CAAC,IAAI,CAAC,aAAa,EAAE,yBAAa,CAAC,CAAA;IACzC,CAAC;IACD,EAAE,CAAC,CAAC,OAAO,CAAC,CAAC,CAAC;QACZ,OAAO,CAAC,IAAI,CAAC,aAAa,EAAE,yBAAa,GAAG,UAAU,CAAC,CAAA;IACzD,CAAC;IACD,MAAM,CAAC,aAAa,CAAA;AACtB,CAAC"}
\ No newline at end of file
diff --git a/dist/test/message-parserSpec.js b/dist/test/message-parserSpec.js
index e821522..527f6f7 100644
--- a/dist/test/message-parserSpec.js
+++ b/dist/test/message-parserSpec.js
@@ -15,7 +15,7 @@ describe('message parser', () => {
             }
             it(`parses ${message_constants_1.TOPIC[topic]} messages ${authAction} correctly`, () => {
                 const result = message_parser_1.parse(spec.urp.value)[0];
-                chai_1.expect(result.parseError).to.be.undefined;
+                chai_1.expect(result.parseError).to.be.an('undefined');
                 if (!result.parseError &&
                     (!result.payloadEncoding || result.payloadEncoding === message_constants_1.PAYLOAD_ENCODING.JSON)) {
                     chai_1.expect(message_parser_1.parseData(result)).to.equal(true);
diff --git a/dist/test/message-parserSpec.js.map b/dist/test/message-parserSpec.js.map
index 32ff0c0..f3a410e 100644
--- a/dist/test/message-parserSpec.js.map
+++ b/dist/test/message-parserSpec.js.map
@@ -1 +1 @@
-{"version":3,"file":"message-parserSpec.js","sourceRoot":"","sources":["../../test/message-parserSpec.ts"],"names":[],"mappings":";;AAAA,gEAGiC;AACjC,0DAAwD;AACxD,yCAAqC;AACrC,+BAA6B;AAE7B,QAAQ,CAAC,gBAAgB,EAAE,GAAG,EAAE;IAC9B,GAAG,CAAC,CAAC,MAAM,QAAQ,IAAI,mBAAQ,CAAC,CAAC,CAAC;QAChC,MAAM,KAAK,GAAU,MAAM,CAAC,QAAQ,CAAC,CAAA;QACrC,GAAG,CAAC,CAAC,MAAM,UAAU,IAAI,mBAAQ,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;YACzC,MAAM,IAAI,GAAG,mBAAQ,CAAC,KAAK,CAAC,CAAC,UAAU,CAAC,CAAA;YACxC,EAAE,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC;gBACV,OAAO,CAAC,GAAG,CAAC,aAAa,EAAE,yBAAK,CAAC,KAAK,CAAC,EAAE,UAAU,EAAE,cAAc,CAAC,CAAA;gBACpE,QAAQ,CAAA;YACV,CAAC;YACD,EAAE,CAAE,UAAU,yBAAK,CAAC,KAAK,CAAC,aAAa,UAAU,YAAY,EAAE,GAAG,EAAE;gBAClE,MAAM,MAAM,GAAG,sBAAK,CAAC,IAAI,CAAC,GAAG,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAA;gBACvC,aAAM,CAAC,MAAM,CAAC,UAAU,CAAC,CAAC,EAAE,CAAC,EAAE,CAAC,SAAS,CAAA;gBACzC,EAAE,CAAC,CAAC,CAAC,MAAM,CAAC,UAAU;oBACpB,CAAC,CAAC,MAAM,CAAC,eAAe,IAAI,MAAM,CAAC,eAAe,KAAK,oCAAgB,CAAC,IAAI,CAC9E,CAAC,CAAC,CAAC;oBACD,aAAM,CAAC,0BAAS,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,KAAK,CAAC,IAAI,CAAC,CAAA;gBAC1C,CAAC;gBACD,aAAM,CAAC,MAAM,CAAC,CAAC,EAAE,CAAC,IAAI,CAAC,KAAK,CAAC,IAAI,CAAC,OAAO,CAAC,CAAA;YAC5C,CAAC,CAAC,CAAA;QACJ,CAAC;IACH,CAAC;AAEH,CAAC,CAAC,CAAA"}
\ No newline at end of file
+{"version":3,"file":"message-parserSpec.js","sourceRoot":"","sources":["../../test/message-parserSpec.ts"],"names":[],"mappings":";;AAAA,gEAGiC;AACjC,0DAAwD;AACxD,yCAAqC;AACrC,+BAA6B;AAE7B,QAAQ,CAAC,gBAAgB,EAAE,GAAG,EAAE;IAC9B,GAAG,CAAC,CAAC,MAAM,QAAQ,IAAI,mBAAQ,CAAC,CAAC,CAAC;QAChC,MAAM,KAAK,GAAU,MAAM,CAAC,QAAQ,CAAC,CAAA;QACrC,GAAG,CAAC,CAAC,MAAM,UAAU,IAAI,mBAAQ,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;YACzC,MAAM,IAAI,GAAG,mBAAQ,CAAC,KAAK,CAAC,CAAC,UAAU,CAAC,CAAA;YACxC,EAAE,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC;gBACV,OAAO,CAAC,GAAG,CAAC,aAAa,EAAE,yBAAK,CAAC,KAAK,CAAC,EAAE,UAAU,EAAE,cAAc,CAAC,CAAA;gBACpE,QAAQ,CAAA;YACV,CAAC;YACD,EAAE,CAAE,UAAU,yBAAK,CAAC,KAAK,CAAC,aAAa,UAAU,YAAY,EAAE,GAAG,EAAE;gBAClE,MAAM,MAAM,GAAG,sBAAK,CAAC,IAAI,CAAC,GAAG,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAA;gBACvC,aAAM,CAAC,MAAM,CAAC,UAAU,CAAC,CAAC,EAAE,CAAC,EAAE,CAAC,EAAE,CAAC,WAAW,CAAC,CAAA;gBAC/C,EAAE,CAAC,CAAC,CAAC,MAAM,CAAC,UAAU;oBACpB,CAAC,CAAC,MAAM,CAAC,eAAe,IAAI,MAAM,CAAC,eAAe,KAAK,oCAAgB,CAAC,IAAI,CAC9E,CAAC,CAAC,CAAC;oBACD,aAAM,CAAC,0BAAS,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,KAAK,CAAC,IAAI,CAAC,CAAA;gBAC1C,CAAC;gBACD,aAAM,CAAC,MAAM,CAAC,CAAC,EAAE,CAAC,IAAI,CAAC,KAAK,CAAC,IAAI,CAAC,OAAO,CAAC,CAAA;YAC5C,CAAC,CAAC,CAAA;QACJ,CAAC;IACH,CAAC;AAEH,CAAC,CAAC,CAAA"}
\ No newline at end of file
diff --git a/dist/test/messagesSpec.js b/dist/test/messagesSpec.js
index 979f26a..5b455ce 100644
--- a/dist/test/messagesSpec.js
+++ b/dist/test/messagesSpec.js
@@ -9,7 +9,7 @@ describe('protocol', () => {
         for (const action in message_constants_1.ACTIONS[topic]) {
             if (isNaN(Number(action))) {
                 it(`contains message for ${message_constants_1.TOPIC[topic]} with action ${action} in protocol`, () => {
-                    chai_1.expect(messages_1.MESSAGES[topic][action]).not.to.be.undefined;
+                    chai_1.expect(messages_1.MESSAGES[topic][action]).not.to.be.an('undefined');
                 });
             }
         }
diff --git a/dist/test/messagesSpec.js.map b/dist/test/messagesSpec.js.map
index 8403d31..29a3288 100644
--- a/dist/test/messagesSpec.js.map
+++ b/dist/test/messagesSpec.js.map
@@ -1 +1 @@
-{"version":3,"file":"messagesSpec.js","sourceRoot":"","sources":["../../test/messagesSpec.ts"],"names":[],"mappings":";;AAAA,+BAA6B;AAE7B,gEAGiC;AAEjC,gEAEiC;AAEjC,yCAAqC;AAErC,QAAQ,CAAC,UAAU,EAAE,GAAG,EAAE;IACxB,GAAG,CAAC,CAAC,MAAM,KAAK,IAAI,2BAAO,CAAC,CAAC,CAAC;QAC5B,GAAG,CAAC,CAAC,MAAM,MAAM,IAAI,2BAAO,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;YACpC,EAAE,CAAC,CAAC,KAAK,CAAC,MAAM,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC;gBAC1B,EAAE,CAAE,wBAAwB,yBAAK,CAAC,KAAK,CAAC,gBAAgB,MAAM,cAAc,EAAE,GAAG,EAAE;oBAClF,aAAM,CAAC,mBAAQ,CAAC,KAAK,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,GAAG,CAAC,EAAE,CAAC,EAAE,CAAC,SAAS,CAAA;gBACpD,CAAC,CAAC,CAAA;YACJ,CAAC;QACH,CAAC;IACH,CAAC;AACH,CAAC,CAAC,CAAA;AAEF,SAAS,CAAC,gBAAgB,EAAE,GAAG,EAAE;IAC/B,GAAG,CAAC,CAAC,MAAM,QAAQ,IAAI,mBAAQ,CAAC,CAAC,CAAC;QAChC,MAAM,KAAK,GAAU,MAAM,CAAC,QAAQ,CAAC,CAAA;QACrC,GAAG,CAAC,CAAC,MAAM,SAAS,IAAI,mBAAQ,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;YACxC,MAAM,IAAI,GAAG,mBAAQ,CAAC,KAAK,CAAC,CAAC,SAAS,CAAC,CAAA;YACvC,MAAM,MAAM,GAAG,2BAAO,CAAC,KAAK,CAAC,CAAC,SAAS,CAAC,CAAA;YACxC,EAAE,CAAE,kBAAkB,yBAAK,CAAC,KAAK,CAAC,gBAAgB,SAAS,WAAW,EAAE,GAAG,EAAE;gBAC3E,EAAE,CAAC,CAAC,IAAI,IAAI,CAAC,IAAI,CAAC,OAAO,CAAC,UAAU,CAAC,CAAC,CAAC;oBACrC,mDAAmD;gBACrD,CAAC;YACH,CAAC,CAAC,CAAA;YACF,EAAE,CAAE,+CAA+C,yBAAK,CAAC,KAAK,CAAC,gBAAgB,SAAS,EAAE,EAAE,GAAG,EAAE;gBAC/F,EAAE,CAAC,CAAC,IAAI,IAAI,IAAI,CAAC,GAAG,CAAC,IAAI,CAAC,OAAO,CAAC,eAAe,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC;oBAC1D,aAAM,CAAC,oCAAgB,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,KAAK,CAAC,IAAI,CAAC,CAAA;gBACxD,CAAC;gBAAC,IAAI,CAAC,CAAC;oBACN,aAAM,CAAC,oCAAgB,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,KAAK,CAAC,KAAK,CAAC,CAAA;gBACzD,CAAC;YACH,CAAC,CAAC,CAAA;QACJ,CAAC;IACH,CAAC;AACH,CAAC,CAAC,CAAA"}
\ No newline at end of file
+{"version":3,"file":"messagesSpec.js","sourceRoot":"","sources":["../../test/messagesSpec.ts"],"names":[],"mappings":";;AAAA,+BAA6B;AAE7B,gEAGiC;AAEjC,gEAEiC;AAEjC,yCAAqC;AAErC,QAAQ,CAAC,UAAU,EAAE,GAAG,EAAE;IACxB,GAAG,CAAC,CAAC,MAAM,KAAK,IAAI,2BAAO,CAAC,CAAC,CAAC;QAC5B,GAAG,CAAC,CAAC,MAAM,MAAM,IAAI,2BAAO,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;YACpC,EAAE,CAAC,CAAC,KAAK,CAAC,MAAM,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC;gBAC1B,EAAE,CAAE,wBAAwB,yBAAK,CAAC,KAAK,CAAC,gBAAgB,MAAM,cAAc,EAAE,GAAG,EAAE;oBAClF,aAAM,CAAC,mBAAQ,CAAC,KAAK,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,GAAG,CAAC,EAAE,CAAC,EAAE,CAAC,EAAE,CAAC,WAAW,CAAC,CAAA;gBAC1D,CAAC,CAAC,CAAA;YACJ,CAAC;QACH,CAAC;IACH,CAAC;AACH,CAAC,CAAC,CAAA;AAEF,SAAS,CAAC,gBAAgB,EAAE,GAAG,EAAE;IAC/B,GAAG,CAAC,CAAC,MAAM,QAAQ,IAAI,mBAAQ,CAAC,CAAC,CAAC;QAChC,MAAM,KAAK,GAAU,MAAM,CAAC,QAAQ,CAAC,CAAA;QACrC,GAAG,CAAC,CAAC,MAAM,SAAS,IAAI,mBAAQ,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;YACxC,MAAM,IAAI,GAAG,mBAAQ,CAAC,KAAK,CAAC,CAAC,SAAS,CAAC,CAAA;YACvC,MAAM,MAAM,GAAG,2BAAO,CAAC,KAAK,CAAC,CAAC,SAAS,CAAC,CAAA;YACxC,EAAE,CAAE,kBAAkB,yBAAK,CAAC,KAAK,CAAC,gBAAgB,SAAS,WAAW,EAAE,GAAG,EAAE;gBAC3E,EAAE,CAAC,CAAC,IAAI,IAAI,CAAC,IAAI,CAAC,OAAO,CAAC,UAAU,CAAC,CAAC,CAAC;oBACrC,mDAAmD;gBACrD,CAAC;YACH,CAAC,CAAC,CAAA;YACF,EAAE,CAAE,+CAA+C,yBAAK,CAAC,KAAK,CAAC,gBAAgB,SAAS,EAAE,EAAE,GAAG,EAAE;gBAC/F,EAAE,CAAC,CAAC,IAAI,IAAI,IAAI,CAAC,GAAG,CAAC,IAAI,CAAC,OAAO,CAAC,eAAe,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC;oBAC1D,aAAM,CAAC,oCAAgB,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,KAAK,CAAC,IAAI,CAAC,CAAA;gBACxD,CAAC;gBAAC,IAAI,CAAC,CAAC;oBACN,aAAM,CAAC,oCAAgB,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,KAAK,CAAC,KAAK,CAAC,CAAA;gBACzD,CAAC;YACH,CAAC,CAAC,CAAA;QACJ,CAAC;IACH,CAAC;AACH,CAAC,CAAC,CAAA"}
\ No newline at end of file
diff --git a/src/message-builder.ts b/src/message-builder.ts
index f927887..3ac72e3 100644
--- a/src/message-builder.ts
+++ b/src/message-builder.ts
@@ -58,8 +58,7 @@ import {
   hasPayload,
 } from './message-validator'
 
-export function getMessage (msg: Message, isAck: boolean): Buffer {
-  const message = msg as any
+export function getMessage (message: Message, isAck: boolean): Buffer {
   let action = message.action
 
   // convert action to write ack if necessary
@@ -67,9 +66,11 @@ export function getMessage (msg: Message, isAck: boolean): Buffer {
     action = ACTION_TO_WRITE_ACK[message.action]
   }
 
+  const actionTopic = ACTIONS[message.topic]
+
   if (message.isAck || isAck) {
     action |= 0x80
-    if ((ACTIONS as any)[message.topic][message.action] === undefined) {
+    if (!actionTopic || actionTopic[message.action] === undefined) {
       throw new Error(`message ${TOPIC[message.topic]} ${message.action} should not have an ack`)
     }
   }
@@ -84,7 +85,7 @@ export function getMessage (msg: Message, isAck: boolean): Buffer {
 
   const metaError = validateMeta(message.topic, action, meta)
   if (metaError) {
-    throw new Error(`invalid ${TOPIC[message.topic]} ${(ACTIONS as any)[message.topic][action] || action}: ${metaError}`)
+    throw new Error(`invalid ${TOPIC[message.topic]} ${actionTopic[action] || action}: ${metaError}`)
   }
 
   const metaStr = JSON.stringify(meta)
diff --git a/src/message-constants.ts b/src/message-constants.ts
index 10ee341..005ba38 100644
--- a/src/message-constants.ts
+++ b/src/message-constants.ts
@@ -97,7 +97,7 @@ export interface RecordAckMessage extends RecordMessage {
 }
 
 export interface ParseError {
-  parseError: boolean
+  parseError: true
   action: PARSER_ACTIONS
 
   parsedMessage: Message
diff --git a/test/message-parserSpec.ts b/test/message-parserSpec.ts
index df5760e..f3a6053 100644
--- a/test/message-parserSpec.ts
+++ b/test/message-parserSpec.ts
@@ -17,7 +17,7 @@ describe('message parser', () => {
       }
       it (`parses ${TOPIC[topic]} messages ${authAction} correctly`, () => {
         const result = parse(spec.urp.value)[0]
-        expect(result.parseError).to.be.undefined
+        expect(result.parseError).to.be.an('undefined')
         if (!result.parseError &&
           (!result.payloadEncoding || result.payloadEncoding === PAYLOAD_ENCODING.JSON)
         ) {
diff --git a/test/messagesSpec.ts b/test/messagesSpec.ts
index 5735ff6..5f8f00c 100644
--- a/test/messagesSpec.ts
+++ b/test/messagesSpec.ts
@@ -16,7 +16,7 @@ describe('protocol', () => {
     for (const action in ACTIONS[topic]) {
       if (isNaN(Number(action))) {
         it (`contains message for ${TOPIC[topic]} with action ${action} in protocol`, () => {
-         expect(MESSAGES[topic][action]).not.to.be.undefined
+         expect(MESSAGES[topic][action]).not.to.be.an('undefined')
         })
       }
     }