babel-preset-mjs

0.0.4 • Public • Published

babel-preset-mjs

Babel preset to transpile JS to restricted mjs JS.

Features

Restriction Solution
No String, Number, RegExp, Date, Function, etc. Not solved
No try/catch/finally. Transpiled to functions that make try/catch/finally work.
No error classes. Not solved
No new or prototypes. In order to create an object with a custom prototype, use Object.create(), which is available. new is handled by Object.create(), and the constructor is called on the resultant object
Strict mode only. No for..of, =>, destructors, generators, proxies, promises, classes, template strings. Handled by babel-preset-es2015 (included by default).
No var, only let. All uses of var are changed to let.
No getters, setters, valueOf. Not solved
No == or !=, only === and !==. All uses of == are transpiled to a manually evaluated loose equals.
load() is used to load external JS, not very standardized and pollutes the global scope. Not solved
No setTimeout() and setInterval() API. Polyfilled using api_timer.js.

Usage

.babelrc:

{
  "presets": [
    "mjs"
  ]
}

License

Licensed under MIT license.

Copyright (C) 2017 Karim Alibhai.

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Install

npm i babel-preset-mjs

Weekly Downloads

1

Version

0.0.4

License

MIT

Last publish

Collaborators

  • karimsa