7e6315075d
* Integrate importStar and importDefault helpers * Accept baselines * Support dynamic imports, write helpers for umd module (and amd is possible) kinds * Accept baselines * Support AMD, use same helper initialization as is normal * update typechecker to have errors on called imported namespaces and good error recovery with a quickfix * Overhaul allowSyntheticDefaultExports to be safer * Put the new behavior behind a flag * Rename strictESM to ESMInterop * ESMInterop -> ESModuleInterop, make default for tsc --init * Rename ESMInterop -> ESModuleInterop in module.ts, add emit test (since fourslash doesnt do that) * Remove erroneous semicolons from helper * Reword diagnostic * Change style * Edit followup diagnostic * Add secondary quickfix for call sites, tests forthcoming * Add synth default to namespace import type, enhance quickfix * Pair of spare tests for good measure * Fix typos in diagnostic message * Improve comment clarity * Actually accept the updated changes to the esmodule interop description * ESModule -> esModule * Use find and not forEach * Use guard * Rely on implicit falsiness of Result.False * These should have been emit flags
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.