multi-value-map/esm/multi-value-weak-map.js

## Install

export class MultiValueWeakMap {
    constructor() {
        this.map = new WeakMap();
    }
    get(key) {
        return this.map.get(key) || [];
    }
    push(key, value) {
        const array = this.get(key);
        if (!array.length) {
            this.map.set(key, array);
        }
        array.push(value);
        return this;
    }
    delete(key) {
        return this.map.delete(key);
    }
    has(key) {
        return this.map.has(key);
    }
    get [Symbol.toStringTag]() {
        return this.map.toString();
    }
}
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