155 lines
3.4 KiB
Markdown
155 lines
3.4 KiB
Markdown
# 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 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"]
|
|
}
|
|
}
|
|
}
|
|
```
|
|
|
|
|
|
# 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/)
|