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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 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/)