New: Support .mjs extension (closes #65)

README.md

@@ -114,6 +114,7 @@ Map file types to modules which provide a [require.extensions] loader.
  '.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',

index.js

@@ -1,3 +1,7 @@
+var path = require('path');
+
+var mjsStub = path.join(__dirname, 'mjs-stub');
+
 var extensions = {
  '.babel.js': [
  {
@@ -93,6 +97,7 @@ var extensions = {
  '.litcoffee': ['coffeescript/register', 'coffee-script/register', 'coffeescript', 'coffee-script'],
  '.liticed': 'iced-coffee-script/register',
  '.ls': ['livescript', 'LiveScript'],
+ '.mjs': mjsStub,
  '.node': null,
  '.toml': {
  module: 'toml-require',
@@ -148,6 +153,7 @@ var jsVariantExtensions = [
  '.litcoffee',
  '.liticed',
  '.ls',
+ '.mjs',
  '.ts',
  '.tsx',
  '.wisp',

mjs-stub.js

@@ -0,0 +1 @@
+require.extensions['.mjs'] = null;

package.json

@@ -15,7 +15,8 @@
  "main": "index.js",
  "files": [
  "LICENSE",
- "index.js"
+ "index.js",
+ "mjs-stub.js"
  ],
  "scripts": {
  "lint": "eslint .",

test/fixtures/mjs/0/package.json

@@ -0,0 +1 @@
+{}

test/fixtures/mjs/0/test.mjs

@@ -0,0 +1,9 @@
+export default {
+ data: {
+ trueKey: true,
+ falseKey: false,
+ subKey: {
+ subProp: 1
+ }
+ }
+};

test/fixtures/mjs/1/package.json

@@ -0,0 +1 @@
+{}

test/fixtures/mjs/1/test.mjs

@@ -0,0 +1,9 @@
+module.exports = {
+ data: {
+ trueKey: true,
+ falseKey: false,
+ subKey: {
+ subProp: 1
+ }
+ }
+};

test/index.js

@@ -84,6 +84,11 @@ describe('interpret.extensions', function() {
  return attempts;
  }
 
+ // We will handle the .mjs tests separately
+ if (ext === '.mjs') {
+ return attempts;
+ }
+
  modules.forEach(function(mod, idx) {
  if (mod && typeof mod !== 'string') {
  mod = mod.module;
@@ -205,9 +210,71 @@ describe('interpret.extensions', function() {
  };
  expect(require(fixture)).toEqual(expected);
  }
-
  done();
  });
  });
 
+ it('does not error with the .mjs extension', function(done) {
+ var ext = '.mjs';
+ var fixture = './fixtures/' + ext.slice(1) + '/0/test' + ext;
+
+ var result = rechoir.prepare(extensions, fixture);
+
+ expect(Array.isArray(result)).toEqual(true);
+ expect(result[0].moduleName).toEqual(path.join(__dirname, '../mjs-stub'));
+ done();
+ });
+
+ it('the module can be loaded with import(), ignoring the loader', function() {
+ if (nodeVersion.major < 12) {
+ this.skip();
+ }
+
+ var ext = '.mjs';
+ var fixture = './fixtures/' + ext.slice(1) + '/0/test' + ext;
+
+ rechoir.prepare(extensions, fixture);
+
+ var expected = {
+ data: {
+ trueKey: true,
+ falseKey: false,
+ subKey: {
+ subProp: 1,
+ },
+ },
+ };
+
+ // This avoid SyntaxError when parsing on old node versions
+ var imprt = new Function('a', 'return import(a)');
+
+ return imprt(fixture)
+ .then(function(result) {
+ expect(result.default).toEqual(expected);
+ });
+ });
+
+ it('stubs .mjs extension with null on old node that do not care about it', function(done) {
+ if (nodeVersion.major > 10) {
+ this.skip();
+ }
+
+ var ext = '.mjs';
+ var fixture = './fixtures/' + ext.slice(1) + '/1/test' + ext;
+
+ rechoir.prepare(extensions, fixture);
+
+ var expected = {
+ data: {
+ trueKey: true,
+ falseKey: false,
+ subKey: {
+ subProp: 1,
+ },
+ },
+ };
+ expect(require(fixture)).toEqual(expected);
+ done();
+ });
+
 });