Package helpers in helpers-string.js as a commonjs module so that bun…

…dlers may include it as content

.gitignore

@@ -3,3 +3,4 @@ babel-plugin-transform-async-to-promises-*.tgz
 coverage
 async-to-promises.js
 async-to-promises.js.map
+helpers-string.js

.npmignore

@@ -1,6 +1,7 @@
 *.test.js
 babel-plugin-transform-async-to-promises-*.tgz
 coverage
+generate-helpers-string.js
 .travis.yml
 *.ts
 tests/

async-to-promises.ts

@@ -1,7 +1,6 @@
 import { ArrowFunctionExpression, AwaitExpression, BlockStatement, CallExpression, ClassMethod, LabeledStatement, Node, Expression, FunctionDeclaration, Statement, Identifier, ForStatement, ForInStatement, SpreadElement, ReturnStatement, ForOfStatement, Function, FunctionExpression, MemberExpression, NumericLiteral, ThisExpression, SwitchCase, Program, VariableDeclaration, VariableDeclarator, StringLiteral, BooleanLiteral, Pattern, LVal, YieldExpression } from "babel-types";
 import { NodePath, Scope, Visitor } from "babel-traverse";
-import { readFileSync } from "fs";
-import { join } from "path";
+import { code as helperCode } from "./helpers-string";
 
 // Configuration types
 interface AsyncToPromisesConfiguration {
@@ -2854,7 +2853,6 @@ export default function({ types, template, traverse, transformFromAst, version }
 				if (!helpers) {
 					// Read helpers from ./helpers.js
 					const newHelpers: { [name: string]: Helper } = {};
-					const helperCode = readFileSync(join(__dirname, "helpers.js")).toString();
 					const helperAst = require(isNewBabel ? "@babel/core" : "babylon").parse(helperCode, { sourceType: "module" });
 					transformFromAst(helperAst, helperCode, {
 						babelrc: false, plugins: [{

generate-helpers-string.js

@@ -0,0 +1,5 @@
+const { readFileSync, writeFileSync } = require("fs");
+const { join } = require("path");
+
+const helperCode = readFileSync("helpers.js").toString();
+writeFileSync("helpers-string.js", `exports.__esModule = true;\nexports.code = ${JSON.stringify(helperCode)};\n`);

helpers-string.d.ts

@@ -0,0 +1 @@
+export const code: string;

package.json

@@ -4,7 +4,7 @@
   "description": "Transform async/await to promise chains",
   "main": "async-to-promises.js",
   "scripts": {
-    "prepare": "tsc --strict --lib es5,es6,es2016 --types node --module commonjs --sourceMap async-to-promises.ts",
+    "prepare": "tsc --strict --lib es5,es6,es2016 --types node --module commonjs --sourceMap async-to-promises.ts && node ./generate-helpers-string.js",
     "test": "jest",
     "test:coverage": "jest --coverage"
   },