TypeScript
JavaScript with type checks, for maintaining projects in the long term with confidence
Topics
Pages
Content
Byline:JavaScript that scales.
TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.
Any browser. Any host. Any OS. Open source.
Key links
- 🏠 Homepage: https://www.typescriptlang.org/
- 📗 Docs: https://www.typescriptlang.org/docs/
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👨💻 Repo:
- 🌐 Wikipedia
- 🗒️ DevHints cheatsheet
Uncategorized Links
- Download
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TypeScript Cheatsheet
- On my Dev Cheatsheets site
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TypeScript
- Guide on Learn to Code.
- TypeScript in 100 seconds
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React and Webpack
- in TS docs.
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TypeScript and Webpack
- on the Webpack docs.
Documentation
- Basic types
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Interfaces
- type checking based on the shape of the data.
- Enums
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Advanced types
- including type guards, nullable types, conditional types.
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Triple-slash directive
/// <reference path="..." />
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CLI options
- in TS docs
Tutorials
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TypeScript
- on Tutorials Teacher
- TypeScript in 5 minutes
Is TypeScript worth it?
See this comment thread on Y-combinator - Ask HN: Is TypeScript worth it?.
i) Like a framework, you are at the whim of TS devs as it gets updated
ii) Libraries are badly documented
iii) Error messages are hard to follow
iv) It requires yet more transpilation
Response from someone who works in the TypeScript project:
i. Dependency management is indeed frustrating…
ii. My anecdotal experience is that library documentation could indeed be better; however, that’s been the case with JavaScript libraries regardless of types.
iii. Our error messages need to get better - I’m in full agreement with you. Often a concrete repro is a good way to get us thinking. Our error reporting system can often take shortcuts to provide a good error message when we recognize a pattern.
iv. Compilation can be a burden from tooling overhead… Long-term, we’ve been investigating ways to bring type annotations to JavaScript itself and checked by TypeScript - but that might be years away.
Someone else said how the code you have written has to be changed to satisfy TypeScript but becomes less readable and that TypeScript doesn’t always catch issues that you thought it would.