jsmodern/dist/extend.js

An extension to existing JavaScript, influenced by other great languages such as Rust, Dart, Java, Golang, etc.

function toObject(name) {
    switch (name) {
        case 'array': return Array;
        case 'boolean': return Boolean;
        case 'date': return Date;
        case 'error': return Error;
        case 'function': return Function;
        case 'map': return Map;
        case 'number': return Number;
        case 'object': return Object;
        case 'promise': return Promise;
        case 'regExp': return RegExp;
        case 'set': return Set;
        case 'string': return String;
        case 'symbol': return Symbol;
        case 'weakMap': return WeakMap;
        case 'weakSet': return WeakSet;
        case 'iterator':
        default: {
            return 'undefined' === typeof (window) ? global : window;
        }
    }
}
export function extend(extensions) {
    const ext = extensions || {};
    const extKeys = Object.keys(ext);
    if (!extKeys.length)
        return;
    const featuresList = extKeys.map((n) => {
        return { type: toObject(n), features: ext[n] };
    });
    for (const { type, features } of featuresList) {
        for (const { fn, label, isStatic } of features) {
            const ctr = type;
            const root = isStatic || !ctr.prototype ? ctr : ctr.prototype;
            if (label in root)
                continue;
            Object.defineProperty(root, label, {
                configurable: true,
                value: fn,
                writable: true,
            });
        }
    }
}
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