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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