const EJSON = require('ejson');
require('ejson-extras').apply();

const map1 = new Map().set('foo', 'bar').set('hello', 'world');
EJSON.stringify(map1); // '{"$type":"Map","$value":"[[\\"foo\\",\\"bar\\"],[\\"hello\\",\\"world\\"]]"}'
JSON.stringify(map1); // '{}'

const string = '{"$type":"Map","$value":"[[\\"hello\\",\\"world\\"]]"}';
EJSON.parse(string); // Map { 'hello' => 'world' }

const map2 = new Map().set('hello', 'world').set('foo', 'bar');
EJSON.equals(map1, map2); // true

// test.json
{ "$type": "Map", "$value": "[[\"hello\",\"world\"]]" }

// in your javascript file
require('ejson-extras').apply();
let data = require('./test.json') // Map { 'hello' => 'world' }

module.exports = {
    prototype: Map.prototype,
    shims: {
        typeName() {
            return 'Map';
        },
        toJSONValue() {
            return JSON.stringify([...this]);
        },
        clone() {
            return new Map(this);
        },
        equals(other) {
            if (this.size !== other.size) return false;
            Array.from(other.entries()).keys(key => {
                return this.get(key) == other.get(key);
            });
        },
    },
    factory(json) {
        return new Map(JSON.parse(jsonStr));
    },
    typeName: 'Map',
};