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- # tslib
-
- This is a runtime library for [TypeScript](http://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 2.3.3 or later
- npm install --save tslib
-
- # TypeScript 2.3.2 or earlier
- npm install --save tslib@1.6.1
- ```
-
- ## bower
-
- ```sh
- # TypeScript 2.3.3 or later
- bower install tslib
-
- # TypeScript 2.3.2 or earlier
- bower install tslib@1.6.1
- ```
-
- ## JSPM
-
- ```sh
- # TypeScript 2.3.3 or later
- jspm install tslib
-
- # 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@1.10.0/tslib.d.ts"]
- }
- }
- }
- ```
-
-
- # 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).
- * Read the language specification ([docx](http://go.microsoft.com/fwlink/?LinkId=267121), [pdf](http://go.microsoft.com/fwlink/?LinkId=267238)).
-
- # Documentation
-
- * [Quick tutorial](http://www.typescriptlang.org/Tutorial)
- * [Programming handbook](http://www.typescriptlang.org/Handbook)
- * [Language specification](https://github.com/Microsoft/TypeScript/blob/master/doc/spec.md)
- * [Homepage](http://www.typescriptlang.org/)
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