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# tslib This is a runtime library for [TypeScript](https://www.typescriptlang.org/) that contains all of the TypeScript helper functions. This library is primarily used by the `--importHelpers` flag in TypeScript. When using `--importHelpers`, a module that uses helper functions like `__extends` and `__assign` in the following emitted file: ```ts var __assign = (this && this.__assign) || Object.assign || function(t) { for (var s, i = 1, n = arguments.length; i < n; i++) { s = arguments[i]; for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p]; } return t; }; exports.x = {}; exports.y = __assign({}, exports.x); ``` will instead be emitted as something like the following: ```ts var tslib_1 = require("tslib"); exports.x = {}; exports.y = tslib_1.__assign({}, exports.x); ``` Because this can avoid duplicate declarations of things like `__extends`, `__assign`, etc., this means delivering users smaller files on average, as well as less runtime overhead. For optimized bundles with TypeScript, you should absolutely consider using `tslib` and `--importHelpers`. # Installing For the latest stable version, run: ## npm ```sh # TypeScript 3.9.2 or later npm install tslib # TypeScript 3.8.4 or earlier npm install tslib@^1 # TypeScript 2.3.2 or earlier npm install tslib@1.6.1 ``` ## yarn ```sh # TypeScript 3.9.2 or later yarn add tslib # TypeScript 3.8.4 or earlier yarn add tslib@^1 # TypeScript 2.3.2 or earlier yarn add tslib@1.6.1 ``` ## bower ```sh # TypeScript 3.9.2 or later bower install tslib # TypeScript 3.8.4 or earlier bower install tslib@^1 # TypeScript 2.3.2 or earlier bower install tslib@1.6.1 ``` ## JSPM ```sh # TypeScript 3.9.2 or later jspm install tslib # TypeScript 3.8.4 or earlier jspm install tslib@^1 # TypeScript 2.3.2 or earlier jspm install tslib@1.6.1 ``` # Usage Set the `importHelpers` compiler option on the command line: ``` tsc --importHelpers file.ts ``` or in your tsconfig.json: ```json { "compilerOptions": { "importHelpers": true } } ``` #### For bower and JSPM users You will need to add a `paths` mapping for `tslib`, e.g. For Bower users: ```json { "compilerOptions": { "module": "amd", "importHelpers": true, "baseUrl": "./", "paths": { "tslib" : ["bower_components/tslib/tslib.d.ts"] } } } ``` For JSPM users: ```json { "compilerOptions": { "module": "system", "importHelpers": true, "baseUrl": "./", "paths": { "tslib" : ["jspm_packages/npm/tslib@2.x.y/tslib.d.ts"] } } } ``` ## Deployment - Choose your new version number - Set it in `package.json` and `bower.json` - Create a tag: `git tag [version]` - Push the tag: `git push --tags` - Create a [release in GitHub](https://github.com/microsoft/tslib/releases) - Run the [publish to npm](https://github.com/microsoft/tslib/actions?query=workflow%3A%22Publish+to+NPM%22) workflow Done. # Contribute There are many ways to [contribute](https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md) to TypeScript. * [Submit bugs](https://github.com/Microsoft/TypeScript/issues) and help us verify fixes as they are checked in. * Review the [source code changes](https://github.com/Microsoft/TypeScript/pulls). * Engage with other TypeScript users and developers on [StackOverflow](http://stackoverflow.com/questions/tagged/typescript). * Join the [#typescript](http://twitter.com/#!/search/realtime/%23typescript) discussion on Twitter. * [Contribute bug fixes](https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md). # Documentation * [Quick tutorial](http://www.typescriptlang.org/Tutorial) * [Programming handbook](http://www.typescriptlang.org/Handbook) * [Homepage](http://www.typescriptlang.org/)