esm-to-plain-js

Simplistic string substitution to replace export with a globalThis assignment (CLI tool designed for use in npm scripts)

esm-to-plain-js transforms an ES modules file into a plain JavaScript file for browsers by commenting out the imports and replacing the export statement wth globalThis assignments.  The command's console output includes a timestamp and formatting helpful in build systems.

A) Setup

Install package for node:

$ npm install --save-dev esm-to-plain-js

B) Usage

1. npm scripts

Run esm-to-plain-js from the "scripts" section of your package.json file.

Parameters:

• The first parameter is the source file.
• The second parameter is the target file or folder (use the --folder flag).

Example package.json script:

   "scripts": {
      "make-plain-js": "esm-to-plain-js --cd=build web-app.esm.js web-app.js"
   },

2. Command-line npx

Example terminal commands:

$ npm install --save-dev esm-to-plain-js
$ npx esm-to-plain-js web-app.esm.js web-app.js

You can also install esm-to-plain-js globally (--global) and then run it anywhere directly from the terminal.

3. CLI flags

Command-line flags:

Flag	Description	Values
--cd	Change working directory before starting copy.	string
--note	Place to add a comment only for humans.	string
--quiet	Suppress informational messages.	N/A

Examples:

• esm-to-plain-js --cd=build web-app.esm.js web-app.js
  Transforms build/web-app.esm.js to build/web-app.js

• esm-to-plain-js web-app.esm.js web-app.js --quiet
  Displays no output.

C) Application Code

Even though esm-to-plain-js is primarily intended for build scripts, the package can be used programmatically in ESM and TypeScript projects.

Example:

import { esmToPlainJs } from 'esm-to-plain-js';

const result = esmToPlainJs.transform('build/web-app.esm.js', 'build/web-app.js');
console.log('Execution time:', result.duration, 'ms');

See the TypeScript Declarations at the top of esm-to-plain-js.ts for documentation.

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MIT License