Update to TypeScript 4.1.2

libraries/typescript/README.md

@@ -2,7 +2,7 @@
 # TypeScript
 
 [![Build Status](https://travis-ci.org/microsoft/TypeScript.svg?branch=master)](https://travis-ci.org/microsoft/TypeScript)
-[![VSTS Build Status](https://dev.azure.com/typescript/TypeScript/_apis/build/status/Typescript/node10)](https://dev.azure.com/typescript/TypeScript/_build/latest?definitionId=4&view=logs)
+[![Devops Build Status](https://dev.azure.com/typescript/TypeScript/_apis/build/status/Typescript/node10)](https://dev.azure.com/typescript/TypeScript/_build?definitionId=7)
 [![npm version](https://badge.fury.io/js/typescript.svg)](https://www.npmjs.com/package/typescript)
 [![Downloads](https://img.shields.io/npm/dm/typescript.svg)](https://www.npmjs.com/package/typescript)
 
@@ -33,8 +33,8 @@ There are many ways to [contribute](https://github.com/microsoft/TypeScript/blob
 * Help each other in the [TypeScript Community Discord](https://discord.gg/typescript).
 * Join the [#typescript](https://twitter.com/search?q=%23TypeScript) discussion on Twitter.
 * [Contribute bug fixes](https://github.com/microsoft/TypeScript/blob/master/CONTRIBUTING.md).
-* Read the language specification ([docx](https://github.com/microsoft/TypeScript/blob/master/doc/TypeScript%20Language%20Specification.docx?raw=true),
- [pdf](https://github.com/microsoft/TypeScript/blob/master/doc/TypeScript%20Language%20Specification.pdf?raw=true), [md](https://github.com/microsoft/TypeScript/blob/master/doc/spec.md)).
+* Read the archived language specification ([docx](https://github.com/microsoft/TypeScript/blob/master/doc/TypeScript%20Language%20Specification%20-%20ARCHIVED.docx?raw=true),
+ [pdf](https://github.com/microsoft/TypeScript/blob/master/doc/TypeScript%20Language%20Specification%20-%20ARCHIVED.pdf?raw=true), [md](https://github.com/microsoft/TypeScript/blob/master/doc/spec-archived.md)).
 
 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see
 the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com)
@@ -44,7 +44,6 @@ with any additional questions or comments.
 
 *  [TypeScript in 5 minutes](https://www.typescriptlang.org/docs/handbook/typescript-in-5-minutes.html)
 *  [Programming handbook](https://www.typescriptlang.org/docs/handbook/basic-types.html)
-*  [Language specification](https://github.com/microsoft/TypeScript/blob/master/doc/spec.md)
 *  [Homepage](https://www.typescriptlang.org/)
 
 ## Building
@@ -67,7 +66,7 @@ Install [Gulp](https://gulpjs.com/) tools and dev dependencies:
 
 ```bash
 npm install -g gulp
-npm install
+npm ci
 ```
 
 Use one of the following to build and test:
@@ -79,8 +78,6 @@ gulp LKG               # Replace the last known good with the built one.
                        # Bootstrapping step to be executed when the built compiler reaches a stable state.
 gulp tests             # Build the test infrastructure using the built compiler.
 gulp runtests          # Run tests using the built compiler and test infrastructure.
-                       # Some low-value tests are skipped when not on a CI machine - you can use the
-                       # --skipPercent=0 command to override this behavior and run all tests locally.
                        # You can override the specific suite runner used or specify a test for this command.
                        # Use --tests=<testPath> for a specific test and/or --runner=<runnerName> for a specific suite.
                        # Valid runners include conformance, compiler, fourslash, project, user, and docker