ES6 Map Implemented in typescript
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ES6 Map implemented in TypeScript.

This is not an ES6 Map polyfill, it is not a pure implementation (but it's really close!). I just needed a way to declare maps in my ts code in a safe, reusable way without taking dozens of kilobytes.

Just over 1 kilobyte gzipped. :)


npm install typescript-map

The lib creates a single global variable: TSMap

If you're using typescript/ES6:

import { TSMap } from "typescript-map"

If you're using commonjs:

const TSMap = require("typescript-map").TSMap;

If you're just using it in the browser:

  1. Download dist/tsmap.min.js

  2. Include it in your head: <script src="tsmap.min.js"></script>.


var myMap = new TSMap();
console.log(myMap.get('foo')) //<= "bar"

var myMap = new TSMap<string,number>();

//ES6 Maps take an array of arrays as the optional init object:
var myMap = new TSMap([

Also includes several functions that aren't in the spec

// Safely retrieve a deeply nested object, works for nested TSMaps, objects and arrays.
let someValue = myMap.deepGet(["deeply","nested","property"]);

// Insert items keeping the keys sorted (Uses a super fast binary insert method)
myMap.sortedSet(5, "apple");
myMap.sortedSet(2, "orange");
myMap.sortedSet(7, "bannana");
console.log(myMap.keys()) // <= [2, 5, 7];

//Import JSON into the map
var myMap = new TSMap().fromJSON({
}, true); // <= optional second parameter, if "true" nested objects should be converted to TSMaps.

//Export the map to JSON
var myJSON = myMap.toJSON();

//Map the map (insert meme here).  Returns an array, not the map.
var anArray =, key) {
    return value + " oh look, another hippy".

//Filter the map (removes items in the current map)
myMap.filter(function(value, key) {
    return key%2; //Remove all even objects;

Everything is documented in the src/index.ts file and the definitions file is pretty clear. If you need a full doc on using Maps look here: MDN Map Docs


npm install && npm run build