143 lines
3.4 KiB
Markdown
143 lines
3.4 KiB
Markdown
# tslib
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This is a runtime library for [TypeScript](http://www.typescriptlang.org/) that contains all of the TypeScript helper functions.
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This library is primarily used by the `--importHelpers` flag in TypeScript.
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When using `--importHelpers`, a module that uses helper functions like `__extends` and `__assign` in the following emitted file:
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```ts
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var __assign = (this && this.__assign) || Object.assign || function(t) {
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for (var s, i = 1, n = arguments.length; i < n; i++) {
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s = arguments[i];
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for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
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t[p] = s[p];
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}
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return t;
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};
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exports.x = {};
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exports.y = __assign({}, exports.x);
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```
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will instead be emitted as something like the following:
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```ts
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var tslib_1 = require("tslib");
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exports.x = {};
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exports.y = tslib_1.__assign({}, exports.x);
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```
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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.
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For optimized bundles with TypeScript, you should absolutely consider using `tslib` and `--importHelpers`.
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# Installing
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For the latest stable version, run:
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## npm
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```sh
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# TypeScript 2.3.3 or later
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npm install tslib
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# TypeScript 2.3.2 or earlier
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npm install tslib@1.6.1
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```
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## yarn
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```sh
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# TypeScript 2.3.3 or later
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yarn add tslib
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# TypeScript 2.3.2 or earlier
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yarn add tslib@1.6.1
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```
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## bower
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```sh
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# TypeScript 2.3.3 or later
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bower install tslib
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# TypeScript 2.3.2 or earlier
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bower install tslib@1.6.1
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```
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## JSPM
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```sh
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# TypeScript 2.3.3 or later
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jspm install tslib
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# TypeScript 2.3.2 or earlier
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jspm install tslib@1.6.1
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```
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# Usage
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Set the `importHelpers` compiler option on the command line:
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```
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tsc --importHelpers file.ts
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```
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or in your tsconfig.json:
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```json
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{
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"compilerOptions": {
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"importHelpers": true
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}
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}
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```
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#### For bower and JSPM users
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You will need to add a `paths` mapping for `tslib`, e.g. For Bower users:
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```json
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{
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"compilerOptions": {
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"module": "amd",
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"importHelpers": true,
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"baseUrl": "./",
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"paths": {
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"tslib" : ["bower_components/tslib/tslib.d.ts"]
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}
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}
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}
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```
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For JSPM users:
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```json
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{
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"compilerOptions": {
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"module": "system",
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"importHelpers": true,
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"baseUrl": "./",
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"paths": {
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"tslib" : ["jspm_packages/npm/tslib@1.[version].0/tslib.d.ts"]
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}
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}
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}
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```
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# Contribute
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There are many ways to [contribute](https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md) to TypeScript.
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* [Submit bugs](https://github.com/Microsoft/TypeScript/issues) and help us verify fixes as they are checked in.
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* Review the [source code changes](https://github.com/Microsoft/TypeScript/pulls).
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* Engage with other TypeScript users and developers on [StackOverflow](http://stackoverflow.com/questions/tagged/typescript).
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* Join the [#typescript](http://twitter.com/#!/search/realtime/%23typescript) discussion on Twitter.
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* [Contribute bug fixes](https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md).
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# Documentation
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* [Quick tutorial](http://www.typescriptlang.org/Tutorial)
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* [Programming handbook](http://www.typescriptlang.org/Handbook)
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* [Homepage](http://www.typescriptlang.org/)
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