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ES6-shim is a powerful, ECMAScript 6 (Harmony) compatible tool designed to create seamless compatibility shims for legacy JavaScript engines. With ES6-shim, your JavaScript environment mimics as closely as possible to ECMAScript 6 (Harmony), allowing more progressive coding patterns and language features to be executed even on systems that may not natively support them. Notably, it caters to several functionalities such as Map, Set, Promise, and various String, Object, Number, Array, RegExp, Math functions, and more.
To use ES6-shim, you have two main options:
For use in a browser, you need to include the es6-shim before your scripts. If your browser doesn't support ECMAScript 5, you should also include es5-shim before es6-shim.
For node.js, io.js or any npm-managed workflow, you just have to install it through the npm package manager with the command npm install es6-shim.
For better String.prototype.normalize support, it is recommended to install the unorm package alongside es6-shim.
Below is a basic usage code snippet:
require('es6-shim');
var assert = require('assert');
//Using startsWith and endsWith String methods
assert.equal(true, 'abc'.startsWith('a'));
assert.equal(false, 'abc'.endsWith('a'));
//Using Map, a replacement for `{}` key-value storage.
var map = new Map([['Bob', 42], ['Foo', 'bar']]);
map.set('John', 25);
map.set('Alice', 400);
map.set(['meh'], 555);
//... and so on
Consult the README of es6-shim for a detailed usage guide.
For detailed documentation and support, visit the official GitHub repository git://github.com/paulmillr/es6-shim.git. The repository contains comprehensive information about what's provided by ES6-shim, and how to use it effectively. For a more detailed understanding of ECMAScript 6 spec shims, you can visit the HTML version of the final ECMAScript 6 spec here.
