Create Compatibility with Object.fromEntries() with ES5

[waynevanson]

Search Terms

Object.fromEntries()

Suggestion

I'd like to see Object.fromEntries() available to use as a function when compiling to the browser compatible ES5.

Use Cases

Using Object.fromEntries() when targeting ES5 alongside the friendly Object.entries()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries

Examples

Here is the polyfill from TC39 https://github.com/tc39/proposal-object-from-entries/blob/master/polyfill.js

  
function ObjectFromEntries(iter) {
  const obj = {};

  for (const pair of iter) {
    if (Object(pair) !== pair) {
      throw new TypeError('iterable for fromEntries should yield objects');
    }

    // Consistency with Map: contract is that entry has "0" and "1" keys, not
    // that it is an array or iterable.

    const { '0': key, '1': val } = pair;

    Object.defineProperty(obj, key, {
      configurable: true,
      enumerable: true,
      writable: true,
      value: val,
    });
  }

  return obj;
}

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

My Questions

• Is this feature left out intentionally?
• A guide/where to look when contributing to adding a feature like this?

[jcalz]

• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)

A polyfill for a function is a runtime feature. See #26087

[waynevanson]

Okay, so it is left out on purpose.

Thank you for your response :)

[HrshPtl]

Object.fromEntries() is not support in Microsoft Edge. so there are any replacement of this ?