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This is an ECMAScript proposal that adds static type syntax to JavaScript, enabling type checking without a separate transpilation step. The proposal defines a standard for type annotations, interfaces, generics, and type imports and exports that are stripped during execution, allowing code to run natively in existing JavaScript engines while still being validated by external type checkers.
The main features of tc39/proposal-type-annotations are: ECMAScript Type Specifications, Runtime-Stripped Generic Parameters, Variable Type Declarations, Runtime-Ignored Type Execution, Type Annotation Stripping, Non-Compiled Static Typing, Explicit Type Argument Syntax, Type Parameter Declaration Syntax.
Open-source alternatives to tc39/proposal-type-annotations include: microsoft/typescript-handbook — This project is a comprehensive guide and educational resource for the TypeScript language. It covers the fundamental… gopl-zh/gopl-zh.github.com — This project is a Chinese translation of a comprehensive guide to the Go programming language. It serves as a… alangpierce/sucrase — Sucrase is a high-speed transpilation tool that compiles modern JavaScript, TypeScript, JSX, and Flow to standard… facebook/flow — Flow is a JavaScript static type checker and AST parser that identifies type errors and prevents runtime failures… gibbok/typescript-book — The Concise TypeScript Book: A Concise Guide to Effective Development in TypeScript. Free and Open Source. rust-lang/rust-by-example — This project is an interactive programming education resource and tutorial designed for learning the Rust programming…
This project is a comprehensive guide and educational resource for the TypeScript language. It covers the fundamental principles of the language, including its structural type system, static type analysis, and the process of transpiling typed source files into JavaScript. The material details how to model complex data and reusable type logic using generics, conditional types, and mapped types. It also explains the use of declaration files to provide type safety for external JavaScript libraries and the integration of type checking into existing JavaScript projects via JSDoc annotations. The
The Concise TypeScript Book: A Concise Guide to Effective Development in TypeScript. Free and Open Source.
Sucrase is a high-speed transpilation tool that compiles modern JavaScript, TypeScript, JSX, and Flow to standard JavaScript for modern runtimes. It operates as a fast alternative to Babel, using a single-pass scanner and tokenizer that strips type annotations and applies only requested syntax transforms without building an AST or performing type checking. The tool differentiates itself through a zero-type-checking pipeline that omits type checking entirely, relying on the assumption that input code is already valid for the target runtime. It uses scanner-based tokenization and single-pass co
Flow is a JavaScript static type checker and AST parser that identifies type errors and prevents runtime failures through static annotations. It functions as a code intelligence engine and a static analysis linter to identify unsafe coding patterns and enforce consistency across a codebase. The project includes a type annotation stripper that removes static type signatures from source code, ensuring the resulting JavaScript is compatible with any runtime environment. It also provides a parser that converts typed JavaScript into an abstract syntax tree conforming to the ESTree specification.