@mnrendra/mixexports

A function to mix CommonJS exports.

Use cases

1. Mix named exports with default export.

transforming:

exports.named1 = 'named1';
exports.named2 = 'named2';
exports.default = () => 'main';

to:

exports.named1 = 'named1';
exports.named2 = 'named2';
exports.default = () => 'main';
module.exports = exports.default;
Object.defineProperties(module.exports, {
  __esModule: { value: exports.__esModule },
  named1: { value: exports.named1 },
  named2: { value: exports.named2 },
  default: { value: exports.default }
});

This allows the consumer to import or require the module in the following ways:

import main, { named1 } from 'module'

console.log(main()) // will print: 'main'
console.log(named1) // will print: 'named1'
console.log(main.named2) // will print: 'named2'

or:

const main = require('module')
const { named1 } = require('module')

console.log(main()) // will print: 'main'
console.log(named1) // will print: 'named1'
console.log(main.named2) // will print: 'named2'

2. Export all named exports using module.exports.

transforming:

exports.named1 = 'named1';
exports.named2 = 'named2';

to:

exports.named1 = 'named1';
exports.named2 = 'named2';
module.exports = {};
exports.default = module.exports;
Object.defineProperties(module.exports, {
  __esModule: { value: exports.__esModule },
  named1: { value: exports.named1, enumerable: true },
  named2: { value: exports.named2, enumerable: true },
  default: { value: exports.default }
});

This allows the consumer to import or require the module in the following ways:

import main, { named1 } from 'module'

console.log(named1) // will print: 'named1'
console.log(main.named2) // will print: 'named2'

or:

const main = require('module')
const { named1 } = require('module')

console.log(named1) // will print: 'named1'
console.log(main.named2) // will print: 'named2'

3. Keep external live bindings.

transforming:

let amount = 0;
const increaseAmount = () => {
  amount = amount + 1;
};

Object.defineProperty(exports, "amount", { get () { return amount; }, enumerable: true });
exports.increaseAmount = increaseAmount;

to:

let amount = 0;
const increaseAmount = () => {
  amount = amount + 1;
};
Object.defineProperty(exports, "amount", { get () { return amount; } });
exports.increaseAmount = increaseAmount;
module.exports = {};
exports.default = module.exports;
Object.defineProperties(exports, {
  __esModule: { value: exports.__esModule },
  amount: { get () { return amount; }, enumerable: true },
  increaseAmount: { value: exports.increaseAmount, enumerable: true },
  default: { value: exports.default }
});

This allows the consumer to import or require the module in the following ways:

import main, { increaseAmount } from 'module'

console.log(main.amount) // will print: 0
increaseAmount()
console.log(main.amount) // will print: 1

or:

const main = require('module')
const { increaseAmount } = require('module')

console.log(main.amount) // will print: 0
increaseAmount()
console.log(main.amount) // will print: 1

Note: This function uses Object.defineProperties to make all the named exports non-enumerable. Therefore, when the consumer logs the default value with console.log, all the named exports will be hidden (unless the module has no default export) but can still be accessed via destructuring with import or require.

Install

npm i @mnrendra/mixexports

Usage

Using ES Modules:

import { readFileSync, writeFileSync } from 'node:fs'
import mixexports from '@mnrendra/mixexports'

const source = readFileSync('./source.js', { encoding: 'utf8' })

const result = mixexports(source) // mix to pretty format
const minify = mixexports(source, { minify: true }) // mix to minify format

writeFileSync('./result.js', result)
writeFileSync('./minify.js', minify)

Using CommonJS:

const { readFileSync, writeFileSync } = require('node:fs')
const mixexports = require('@mnrendra/mixexports')

const source = readFileSync('./source.js', { encoding: 'utf8' })

const result = mixexports(source) // mix to pretty format
const minify = mixexports(source, { minify: true }) // mix to minify format

writeFileSync('./result.js', result)
writeFileSync('./minify.js', minify)

Options

• minify type: boolean default: false To produce the minified or pretty format.

• defineEsModule type: boolean|undefined default: undefined To specify whether to define exports.__esModule.

Types

import type {
  Options // The options interface.
} from '@mnrendra/mixexports'

License

MIT

Author

@mnrendra