moduletype

(c)Guy Bedford MIT, edited by Bumblehead

Pass in the string representation of a file to get the file's module pattern. moduletype returns the module pattern type used by a script, for example 'cjs' or 'esm'.

moduletype.is("module.exports = require('dep');"); // 'cjs'

The regular expressions used here come from Guy Bedford's systemjs. Guy gives me permission to republish and use them here. Visit Guy's website.

These formats are identified:

• "esm": ECMAScript Module (aka es6)
• "cjs": CommonJS
• "amd": Asynchronous Module Definition
• undefined: unknown module format. probably a 'global' style script

var amdfile = "define(['dep'] , function (d) { return function () {}; });",
    bjsfile = "Object.defineProperty(exports, '__esModule', {",
    cjsfile = "module.exports = require('dep');",
    esmfile = "import {d} from './dep.js';",
    oldfile = "var global1 = dependency();";

moduletype.is(amdfile);  // 'amd'
moduletype.is(cjsfile);  // 'cjs'
moduletype.is(bjsfile);  // 'bjs'
moduletype.is(esmfile);  // 'esm'
moduletype.is(oldfile);  // undefined

moduletype.esm(esmfile); // true
moduletype.esm(amdfile); // false

moduletype.amd(cjsfile); // false
moduletype.amd(amdfile); // true

moduletype.cjs(esmfile); // false
moduletype.cjs(cjsfile); // true

moduletype.bjs(esmfile); // false
moduletype.bjs(bjsfile); // true

(The MIT License)

Copyright (c) Bumblehead [email protected]

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