node package manager

transpile

Transpiles JavaScript modules from one format to another.

It supports from:

  • es6,
  • cjs,
  • amd,
  • steal

to

  • amd,
  • steal,
  • cjs.

Currently, it can not transpile to ES6 module syntax.

Install

> npm install transpile --save-dev

Use

transpile.to transpiles from one format to another format. transpile.able lets you know if a transpile is possible.

Formats

Formats are specified by strings like:

  • "es6" - ES6 Module syntax like import Point from "math";
  • "cjs" - CommonJS syntax like var _ = require('underscore');
  • "amd" - Asynchronous Module Definition syntax like define(['jquery'],function($){});
  • "steal" - steal syntax like steal('jquery', function($){})

transpile.to(load, format, options) -> transpiledResult

Transpiles from the load's format to the specified format. If the load does not specify a format, "es6" modules are assumed. Returns an object containing the transpiled source and sourceMap (if sourceMap option provided).

Example:

var transpile = require('transpile');
var res = transpile.to({
  name: "my/module",
  source: "var foo = require('foo')",
  metadata: {format: "cjs"}
}, "amd")
 
res.code //-> "define("my/module", function(require, exports, module) { ... " 

A load is an object in the shape of an ES6 Load Record like:

{
  name: "moduleName",
  source: "source code",
  metadata: {format: "formatName"}
}

NOTE

Previously transpile.to returned a string containing the transpiled source. To accomodate Source Maps support the API has changed and now returns an object that looks like:

{
  code: "define(...", // The transpiled source, 
  map: {}, // A source map, if sourceMaps option is provided. 
  ast: {} // A Mozilla Parser API compatible AST, created by Esprima 
}

options

  • normalizeMap Object<moduleName,moduleName> - A mapping module names that will be used to replace dependency names in the transpiled result.
  • normalize function(name, currentName, address) -> String - A function that can be used to change moduleNames that are written in the transpiled result.
  • namedDefines Boolean=false - Set to true to insert named defines.
  • transpiler String=traceur - Set which ES6 transpiler to use. Valid options are traceur or 6to5 with traceur being the default.
  • transpile function(source, compileOptions, options) -> Object - If you want to handle tranpiling yourself and not use the built-in options, this is a function that will be given the source and is expected to return an object containing a code string.
  • sourceMaps Boolean=false - Set to true to return a map and ast object along with the result.
  • sourceMapsContent Boolean=false - If sourceMaps is set to true, this option will include the original source contents with the source maps.

transpile.able(fromFormat, toFormat) -> transpiledPath

Returns the path used to transpile from fromFormat to toFormat. If transpiling is not possible, null will be returned.

Example:

var res = transpile.able("steal","cjs");
res //-> ["steal","amd"]; 

This means that a module will be converted from "steal" to "amd" and then to "cjs".

Test

> npm test