@lopatnov/make-iterable/dist/make-iterable.cjs

A TypeScript library that converts objects, functions, and their prototypes into Array-like iterable entities. Supports ES Modules, CommonJS, and UMD.

'use strict';

const objNameSet = new Set(Object.getOwnPropertyNames(Object.prototype));
const arrNames = Object.getOwnPropertyNames(Array.prototype);
const iterableNames = arrNames.filter((name) => !objNameSet.has(name));
function attachIterable(value) {
    if (!Symbol || !Symbol.iterator) {
        return;
    }
    if (Object.getOwnPropertyDescriptor(value, Symbol.iterator)) {
        return;
    }
    Object.defineProperty(value, Symbol.iterator, {
        writable: false,
        enumerable: false,
        configurable: false,
        value: function () {
            let index = 0;
            return {
                next: () => {
                    if (this.length && index < this.length) {
                        return { value: this[index++], done: false };
                    }
                    else {
                        return { value: undefined, done: true };
                    }
                },
            };
        },
    });
}
function attachArrayProperties(value) {
    if (typeof value.push === "function" &&
        typeof value.pop === "function" &&
        typeof value.splice === "function") {
        return;
    }
    const proto = Array.prototype;
    iterableNames.forEach((name) => {
        if (proto[name] instanceof Function) {
            value[name] = function (...args) {
                return proto[name].apply(this, args);
            };
        }
        else {
            if (name === "length") {
                let index = 0;
                while (value[index] !== undefined) {
                    index++;
                }
                Object.defineProperty(value, "length", {
                    value: index,
                    writable: true,
                    enumerable: false,
                    configurable: false,
                });
            }
            else {
                value[name] = proto[name];
            }
        }
    });
}
/**
 * Convert the value to iterable and Array-like object.
 * @param value The value to convert
 * @returns the value with its type and any[]
 * @throws {Error} if value is null, undefined, boolean, number, or string
 */
function makeIterable(value) {
    if (value === undefined ||
        value === null ||
        typeof value === "boolean" ||
        typeof value === "number" ||
        typeof value === "string") {
        throw new Error(`Incorrect argument: ${value}`);
    }
    attachArrayProperties(value);
    attachIterable(value);
    return value;
}

module.exports = makeIterable;
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