31d599abaf
* Revert "Revert "Explicitly typed special assignments are context sensitive (#25619)"" This reverts commit16676f2707. * Revert "Revert "Explicitly typed prototype assignments are context sensitive (#25688)"" This reverts commitff8c30d636. * Initial, wasteful, solution It burns a check flags. Probably necessary, but perhaps not. I haven't accepted baselines, but they are a bit questionable. I'm not sure the synthetic type is right, because I expected to see { "exports": typeof import("x") } but instead see { "x": typeof import("x") }. * Update some baselines * module.exports= always uses lhs type Conflicts between exports property assignments and exports assignments should get a union type instead of an error. * Fix lint and accept good user baselines * Add tests based on user tests. These currently fail. * Fix all but 1 of user test bugs found by typing module.exports Still quite messy and full of notes * Follow merged symbols+allow any object type This allows exports like `module.exports = new EE` to have properties added to them. Still messy, but I'm going to run user tests and look for regressions. * Update improved user baselines * Fix infinite recursion when checking module.exports * Fix bogus use-before-def error getExportSymbolOfValueSymbolIfExported should always merge its returned symbol, whether it's symbol.exportSymbol or just symbol. * Update user test baselines * Cleanup * More small cleanup * Bind `module` of `module.exports` as a special symbol Previously it was also special, but created during name resolution in the checker. It made sense when there was only one special symbol for all files, but now there is one `module` symbol per file.
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 Jake tools and dev dependencies:
npm install -g jake
npm install
Use one of the following to build and test:
jake local # Build the compiler into built/local
jake clean # Delete the built compiler
jake LKG # Replace the last known good with the built one.
# Bootstrapping step to be executed when the built compiler reaches a stable state.
jake tests # Build the test infrastructure using the built compiler.
jake 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>.
jake runtests-browser # Runs the tests using the built run.js file. Syntax is jake runtests. Optional
parameters 'host=', 'tests=[regex], reporter=[list|spec|json|<more>]'.
jake baseline-accept # This replaces the baseline test results with the results obtained from jake runtests.
jake lint # Runs tslint on the TypeScript source.
jake 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.