objectIs

A vendorable Object.is polyfill bundle based on the dependency-free object-is 1.1.0 release. Useful when you want the classic shim behavior locally without pulling in newer helper packages.

Why copy this?

This page ships an Object.is polyfill bundle based on the old dependency-free release line. The value is to keep SameValue semantics local and inspectable without carrying the newer helper graph.

Native alternative: Object.is exists in modern runtimes, but old compatibility layers and cleanup work may still want a vendorable shim with the familiar export shape.

Note: Current object-is releases pull in helper packages. This snippet intentionally uses the simpler 1.1.0 release line as a vendorable first pass.

This copy is your responsibility once you adopt it. It does not automatically receive upstream bug fixes or security updates.

Snippet

Copy-first distribution

Normalized

ESM / TS / normalized

Runtime: node, bun

/**
 * Derived from [email protected]
 * Rule-based normalized variant generated by this repository.
 * Preserve the upstream license and attribution notices when copying this file.
 */
/**
 * Derived from [email protected]
 * Rule-based normalized variant generated by this repository.
 * See THIRD_PARTY_NOTICES.md for upstream license and attribution details.
 */
"use strict";
var numberIsNaN = function (value) {
  return value !== value;
};

var implementation = function is(a, b) {
  if (a === 0 && b === 0) {
    return 1 / a === 1 / b;
  }
  if (a === b) {
    return true;
  }
  if (numberIsNaN(a) && numberIsNaN(b)) {
    return true;
  }
  return false;
};

var getPolyfill = function getPolyfill() {
  return typeof Object.is === "function" ? Object.is : implementation;
};

var shim = function shimObjectIs() {
  var polyfill = getPolyfill();
  if (typeof Object.defineProperty === "function") {
    Object.defineProperty(Object, "is", {
      configurable: true,
      enumerable: false,
      writable: true,
      value: polyfill,
    });
  } else {
    Object.is = polyfill;
  }
  return polyfill;
};

var polyfill = getPolyfill();
polyfill.getPolyfill = getPolyfill;
polyfill.implementation = implementation;
polyfill.shim = shim;

export default polyfill;

Variant note: Bundled from the dependency-free release line, then rule-based normalized for copy-paste into modern TS projects.

Transforms: module.exports-to-export-default, js-extension-to-ts-extension, bundled-upstream-helper

Validation: This normalized variant is intended to stay oxlint and oxfmt clean in this repo.

Raw

CJS / JS / raw

Runtime: node, bun

'use strict';

var numberIsNaN = function (value) {
  return value !== value;
};

var implementation = function is(a, b) {
  if (a === 0 && b === 0) {
    return 1 / a === 1 / b;
  }
  if (a === b) {
    return true;
  }
  if (numberIsNaN(a) && numberIsNaN(b)) {
    return true;
  }
  return false;
};

var getPolyfill = function getPolyfill() {
  return typeof Object.is === 'function' ? Object.is : implementation;
};

var shim = function shimObjectIs() {
  var polyfill = getPolyfill();
  if (typeof Object.defineProperty === 'function') {
    Object.defineProperty(Object, 'is', {
      configurable: true,
      enumerable: false,
      writable: true,
      value: polyfill
    });
  } else {
    Object.is = polyfill;
  }
  return polyfill;
};

var polyfill = getPolyfill();
polyfill.getPolyfill = getPolyfill;
polyfill.implementation = implementation;
polyfill.shim = shim;

module.exports = polyfill;

Variant note: Single-file CommonJS bundle preserving the package's polyfill export shape.