Transform ES modules into CommonJS

The transform-esm-into-cjs utility transforms ES6 modules into CommonJS without adding any unnecessary code.

Warning: If module exports default and named members, default member will be named “default”.

Warning: If default and named members are imported from the same module, default member will be named “default”.

Installation

npm i --save-dev @suns-echoes/transform-esm-into-cjs

Import

// Import utility distribution file
import { transformESMIntoCJS } from '@suns-echoes/transform-esm-into-cjs';

// Import utility from source
import { transformESMIntoCJS } from '@suns-echoes/transform-esm-into-cjs/src';
// or
import { transformESMIntoCJS } from '@suns-echoes/transform-esm-into-cjs/src/transform-esm-into-cjs';

Usage

const cjsCode = transformESMIntoCJS(esmCode, silent);

Arguments

<string> source - original source code (ESM);
<boolean> [silent=false] - Optional, mute warnings (def.: false).

Returns

<string> - transformed source code (CJS).

Examples

Transform ESM code into CJS code and mute warnings:

input string:

import { MyModule } from 'my-module';

transformation script:

const output = transformESMIntoCJS(input, true);

output string:

const { MyModule } = require('my-module');

License

Licensed under MIT