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core-js-pure
Advanced tools
The core-js-pure package is a version of core-js that doesn't pollute the global namespace. It provides polyfills for ECMAScript features, including promises, symbols, collections, iterators, typed arrays, and many other features that are part of the ECMAScript specification but may not be available in all JavaScript environments.
Polyfilling Promises
This code sample demonstrates how to polyfill Promises using core-js-pure. It allows you to use Promises in environments where they are not natively supported.
import 'core-js-pure/stable/promise';
const promise = Promise.resolve(42);
promise.then(value => console.log(value));
Polyfilling Array methods
This code sample shows how to polyfill Array.prototype.find method. It enables the use of this method in environments where it is not part of the Array prototype.
import 'core-js-pure/stable/array/find';
const array = [1, 2, 3];
const found = array.find(item => item > 1);
console.log(found); // 2
Polyfilling Object static methods
This code sample illustrates how to polyfill Object.assign method. It allows the merging of multiple source objects into a target object in environments that do not support this method natively.
import 'core-js-pure/stable/object/assign';
const target = { a: 1 };
const source = { b: 2 };
const returnedTarget = Object.assign(target, source);
console.log(returnedTarget); // { a: 1, b: 2 }
Polyfilling String methods
This code sample demonstrates how to polyfill String.prototype.includes method. It provides a way to check if one string may be found within another string, returning true or false as appropriate.
import 'core-js-pure/stable/string/includes';
const string = 'hello world';
const includesHello = string.includes('hello');
console.log(includesHello); // true
Babel-polyfill is a package that includes core-js and a custom regenerator runtime to emulate a full ES2015+ environment. It's similar to core-js-pure but is more tightly coupled with Babel's transpilation process.
The es6-shim package provides polyfills for many new JavaScript features introduced in ES5 and ES6. It is similar to core-js-pure but does not offer as modular an approach, and it may include shims for features that are not strictly polyfills.
The polyfill-service (also known as polyfill.io) is a service that provides polyfills based on the user's browser user-agent. Unlike core-js-pure, it is a service rather than a package you include in your code, and it dynamically serves only the polyfills needed by the browser.
FAQs
Standard library
The npm package core-js-pure receives a total of 10,582,566 weekly downloads. As such, core-js-pure popularity was classified as popular.
We found that core-js-pure demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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