resolve-package-path/lib/cache.js

a special purpose fast memoizing way to resolve a node modules package.json

'use strict';
function makeCache() {
    // object with no prototype
    const cache = Object.create(null);
    // force the jit to immediately realize this object is a dictionary. This
    // should prevent the JIT from going wastefully one direction (fast mode)
    // then going another (dict mode) after
    cache['_cache'] = 1;
    delete cache['_cache'];
    return cache;
}
module.exports = class Cache {
    constructor() {
        this._store = makeCache();
    }
    set(key, value) {
        return (this._store[key] = value);
    }
    get(key) {
        return this._store[key];
    }
    has(key) {
        return key in this._store;
    }
    delete(key) {
        delete this._store[key];
    }
    get size() {
        return Object.keys(this._store).length;
    }
};
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