@ayonli/jsext/esm/wrap.js

A JavaScript extension package for building strong and modern applications.

/**
 * Wraps a function for decorator pattern but keep its signature.
 * @module
 */
/**
 * Wraps a function inside another function and returns a new function that
 * copies the original function's name and other properties.
 *
 * @example
 * ```ts
 * import wrap from "@ayonli/jsext/wrap";
 *
 * function log(text: string) {
 *     console.log(text);
 * }
 *
 * const show = wrap(log, function (fn, text) {
 *     return fn.call(this, new Date().toISOString() + " " + text);
 * });
 *
 * console.log(show.name); // log
 * console.log(show.length); // 1
 * console.assert(show.toString() === log.toString());
 * ```
 */
function wrap(fn, wrapper) {
    const wrapped = function (...args) {
        return wrapper.call(this, fn, ...args);
    };
    Object.defineProperty(wrapped, "name", Object.getOwnPropertyDescriptor(fn, "name"));
    Object.defineProperty(wrapped, "length", Object.getOwnPropertyDescriptor(fn, "length"));
    Object.defineProperty(wrapped, "toString", {
        configurable: true,
        enumerable: false,
        writable: true,
        value: fn.toString.bind(fn),
    });
    return wrapped;
}

export { wrap as default };
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