e53e56cf82
* Enable '--strictNullChecks' * Fix API baselines * Make sys.getEnvironmentVariable non-nullable * make properties optional instead of using `| undefined` in thier type * reportDiagnostics should be required * Declare firstAccessor as non-nullable * Make `some` a type guard * Fix `getEnvironmentVariable` definition in tests * Pretend transformFlags are always defined * Fix one more use of sys.getEnvironmentVariable * `requiredResponse` accepts undefined, remove assertions * Mark optional properties as optional instead of using `| undefined` * Mark optional properties as optional instead of using ` | undefined` * Remove unnecessary null assertions * Put the bang on the declaration instead of every use * Make `createMapFromTemplate` require a parameter * Mark `EmitResult.emittedFiles` and `EmitResult.sourceMaps` as optional * Plumb through undefined in emitLsit and EmitExpressionList * `ElementAccessExpression.argumentExpression` can not be `undefined` * Add overloads for `writeTokenText` * Make `shouldWriteSeparatingLineTerminator` argument non-nullable * Make `synthesizedNodeStartsOnNewLine` argument required * `PropertyAssignment.initializer` cannot be undefined * Use one `!` at declaration site instead of on every use site * Capture host in a constant and avoid null assertions * Remove few more unused assertions * Update baselines * Use parameter defaults * Update baselines * Fix lint * Make Symbol#valueDeclaration and Symbol#declarations non-optional to reduce assertions * Make Node#symbol and Type#symbol non-optional to reduce assertions * Make `flags` non-nullable to reduce assertions * Convert some asserts to type guards * Make `isNonLocalAlias` a type guard * Add overload for `getSymbolOfNode` for `Declaration` * Some more `getSymbolOfNode` changes * Push undefined suppression into `typeToTypeNodeHelper` * `NodeBuilderContext.tracker` is never `undefined` * use `Debug.assertDefined` * Remove unnecessary tag * Mark `LiteralType.freshType` and `LiteralTupe.regularType` as required |
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TypeScript
TypeScript is a language for application-scale JavaScript. TypeScript adds optional types, classes, and modules to JavaScript. TypeScript supports tools for large-scale JavaScript applications for any browser, for any host, on any OS. TypeScript compiles to readable, standards-based JavaScript. Try it out at the playground, and stay up to date via our blog and Twitter account.
Installing
For the latest stable version:
npm install -g typescript
For our nightly builds:
npm install -g typescript@next
Contribute
There are many ways to contribute to TypeScript.
- Submit bugs and help us verify fixes as they are checked in.
- Review the source code changes.
- Engage with other TypeScript users and developers on StackOverflow.
- Join the #typescript discussion on Twitter.
- Contribute bug fixes.
- Read the language specification (docx, pdf, md).
This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.
Documentation
Building
In order to build the TypeScript compiler, ensure that you have Git and Node.js installed.
Clone a copy of the repo:
git clone https://github.com/Microsoft/TypeScript.git
Change to the TypeScript directory:
cd TypeScript
Install Gulp tools and dev dependencies:
npm install -g gulp
npm install
Use one of the following to build and test:
gulp local # Build the compiler into built/local
gulp clean # Delete the built compiler
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.
# You can override the host or specify a test for this command.
# Use host=<hostName> or tests=<testPath>.
gulp runtests-browser # Runs the tests using the built run.js file. Syntax is gulp runtests. Optional
parameters 'host=', 'tests=[regex], reporter=[list|spec|json|<more>]'.
gulp baseline-accept # This replaces the baseline test results with the results obtained from gulp runtests.
gulp lint # Runs tslint on the TypeScript source.
gulp help # List the above commands.
Usage
node built/local/tsc.js hello.ts
Roadmap
For details on our planned features and future direction please refer to our roadmap.