tslib
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Package description
The tslib package is a runtime library for TypeScript that includes helper functions used by TypeScript emitted code when using various advanced features of the language such as async/await, for...of, spread, rest, and decorators. It is intended to be used with TypeScript's `importHelpers` flag to reduce code duplication and save on bundle size.
Async/Await
Provides a helper function for handling asynchronous operations using async/await syntax in environments that do not natively support these features.
__awaiter(this, void 0, void 0, function* () { const result = yield someAsyncFunction(); return result; })Spread and Rest
Offers a helper function to handle spread and rest operations with arrays, allowing for the combination and copying of arrays.
__spreadArrays([1, 2], [3, 4])Decorators
Includes helper functions for applying decorators to classes and methods, which are a TypeScript feature for adding annotations and a meta-programming syntax for class declarations and members.
__decorate([decoratorsArray], target, key, desc)Generators
Provides a helper function for working with generators and the yield keyword, enabling the use of generator functions in environments that do not support them natively.
__generator(this, function (_a) { switch (_a.label) { case 0: _a.trys.push([0, 2, , 3]); return [4 /*yield*/, someGeneratorFunction()]; case 1: _a.sent(); return [3 /*break*/, 3]; case 2: _a.sent(); return [3 /*break*/, 3]; case 3: return [2 /*return*/]; } });A modular standard library for JavaScript, core-js includes polyfills for ECMAScript features. It is similar to tslib in that it provides functionality to support newer language features on older environments, but it is more comprehensive and includes polyfills for a wider range of ECMAScript features.
Part of the Babel toolchain, babel-runtime is similar to tslib in that it provides a set of helpers for Babel-transpiled code to avoid duplicating helper code across multiple files. It is used in conjunction with Babel's transform-runtime plugin.
A standalone runtime for Regenerator-compiled generator and async functions. It is similar to tslib in providing support for generators and async functions, but it is focused specifically on the transformation of these features by the Regenerator compiler.
Readme
This is a runtime library for TypeScript that contains all of the TypeScript helper functions.
For the latest stable version:
npm install tslib
Set the noEmitHelpers compiler option on the command line or in your tsconfig.json:
tsc --noEmitHelpers
Import tslib in your TypeScript sources:
import * as tslib from "tslib";
const __extends = tslib.__extends;
const __awaiter = tslib.__awaiter;
...
Or use it globally on the web via <script src="tslib.js"></script>:
// <reference path="tslib.global.d.ts" />
var __extends = __tslib.__extends;
var __awaiter = __tslib.__awaiter;
...
There are many ways to contribute to TypeScript.
FAQs
Runtime library for TypeScript helper functions
The npm package tslib receives a total of 209,560,220 weekly downloads. As such, tslib popularity was classified as popular.
We found that tslib demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 8 open source maintainers collaborating on the project.
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