Name	Last modified	Size	Description
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  <a href="http://gulpjs.com">
    <img height="257" width="114" src="https://raw.githubusercontent.com/gulpjs/artwork/master/gulp-2x.png">
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# interpret

[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Travis Build Status][travis-image]][travis-url] [![AppVeyor Build Status][appveyor-image]][appveyor-url] [![Coveralls Status][coveralls-image]][coveralls-url] [![Gitter chat][gitter-image]][gitter-url]

A dictionary of file extensions and associated module loaders.

## What is it
This is used by [Liftoff](http://github.com/tkellen/node-liftoff) to automatically require dependencies for configuration files, and by [rechoir](http://github.com/tkellen/node-rechoir) for registering module loaders.

## API

### extensions
Map file types to modules which provide a [require.extensions] loader.

```js
{
  '.babel.js': [
    {
      module: '@babel/register',
      register: function(hook) {
        // register on .js extension due to https://github.com/joyent/node/blob/v0.12.0/lib/module.js#L353
        // which only captures the final extension (.babel.js -> .js)
        hook({ extensions: '.js' });
      },
    },
    {
      module: 'babel-register',
      register: function(hook) {
        hook({ extensions: '.js' });
      },
    },
    {
      module: 'babel-core/register',
      register: function(hook) {
        hook({ extensions: '.js' });
      },
    },
    {
      module: 'babel/register',
      register: function(hook) {
        hook({ extensions: '.js' });
      },
    },
  ],
  '.babel.ts': [
    {
      module: '@babel/register',
      register: function(hook) {
        hook({ extensions: '.ts' });
      },
    },
  ],
  '.buble.js': 'buble/register',
  '.cirru': 'cirru-script/lib/register',
  '.cjsx': 'node-cjsx/register',
  '.co': 'coco',
  '.coffee': ['coffeescript/register', 'coffee-script/register', 'coffeescript', 'coffee-script'],
  '.coffee.md': ['coffeescript/register', 'coffee-script/register', 'coffeescript', 'coffee-script'],
  '.csv': 'require-csv',
  '.eg': 'earlgrey/register',
  '.esm.js': {
    module: 'esm',
    register: function(hook) {
      // register on .js extension due to https://github.com/joyent/node/blob/v0.12.0/lib/module.js#L353
      // which only captures the final extension (.babel.js -> .js)
      var esmLoader = hook(module);
      require.extensions['.js'] = esmLoader('module')._extensions['.js'];
    },
  },
  '.iced': ['iced-coffee-script/register', 'iced-coffee-script'],
  '.iced.md': 'iced-coffee-script/register',
  '.ini': 'require-ini',
  '.js': null,
  '.json': null,
  '.json5': 'json5/lib/require',
  '.jsx': [
    {
      module: '@babel/register',
      register: function(hook) {
        hook({ extensions: '.jsx' });
      },
    },
    {
      module: 'babel-register',
      register: function(hook) {
        hook({ extensions: '.jsx' });
      },
    },
    {
      module: 'babel-core/register',
      register: function(hook) {
        hook({ extensions: '.jsx' });
      },
    },
    {
      module: 'babel/register',
      register: function(hook) {
        hook({ extensions: '.jsx' });
      },
    },
    {
      module: 'node-jsx',
      register: function(hook) {
        hook.install({ extension: '.jsx', harmony: true });
      },
    },
  ],
  '.litcoffee': ['coffeescript/register', 'coffee-script/register', 'coffeescript', 'coffee-script'],
  '.liticed': 'iced-coffee-script/register',
  '.ls': ['livescript', 'LiveScript'],
  '.mjs': '/absolute/path/to/interpret/mjs-stub.js',
  '.node': null,
  '.toml': {
    module: 'toml-require',
    register: function(hook) {
      hook.install();
    },
  },
  '.ts': [
    'ts-node/register',
    'typescript-node/register',
    'typescript-register',
    'typescript-require',
    'sucrase/register/ts',
    {
      module: '@babel/register',
      register: function(hook) {
        hook({ extensions: '.ts' });
      },
    },
  ],
  '.tsx': [
    'ts-node/register',
    'typescript-node/register',
    'sucrase/register',
    {
      module: '@babel/register',
      register: function(hook) {
        hook({ extensions: '.tsx' });
      },
    },
  ],
  '.wisp': 'wisp/engine/node',
  '.xml': 'require-xml',
  '.yaml': 'require-yaml',
  '.yml': 'require-yaml',
}
```

### jsVariants
Same as above, but only include the extensions which are javascript variants.

## How to use it

Consumers should use the exported `extensions` or `jsVariants` object to determine which module should be loaded for a given extension. If a matching extension is found, consumers should do the following:

1. If the value is null, do nothing.

2. If the value is a string, try to require it.

3. If the value is an object, try to require the `module` property. If successful, the `register` property (a function) should be called with the module passed as the first argument.

4. If the value is an array, iterate over it, attempting step #2 or #3 until one of the attempts does not throw.

[require.extensions]: http://nodejs.org/api/globals.html#globals_require_extensions

[downloads-image]: http://img.shields.io/npm/dm/interpret.svg
[npm-url]: https://www.npmjs.com/package/interpret
[npm-image]: http://img.shields.io/npm/v/interpret.svg

[travis-url]: https://travis-ci.org/gulpjs/interpret
[travis-image]: http://img.shields.io/travis/gulpjs/interpret.svg?label=travis-ci

[appveyor-url]: https://ci.appveyor.com/project/gulpjs/interpret
[appveyor-image]: https://img.shields.io/appveyor/ci/gulpjs/interpret.svg?label=appveyor

[coveralls-url]: https://coveralls.io/r/gulpjs/interpret
[coveralls-image]: http://img.shields.io/coveralls/gulpjs/interpret/master.svg

[gitter-url]: https://gitter.im/gulpjs/gulp
[gitter-image]: https://badges.gitter.im/gulpjs/gulp.svg