Web Reference: Jul 22, 2022 · Using type annotations, a developer can explicitly state the type of variable or expression (if it’s a string, type, boolean…). They start with colon : followed by the type. This proposal aims to enable developers to add type annotations to their JavaScript code, allowing those annotations to be checked by a type checker that is external to JavaScript. At runtime, a JavaScript engine ignores them, treating the types as comments. Feb 16, 2025 · The "Types as Comments" proposal for JavaScript, which aims to allow type annotations without requiring a build step, has been under discussion in TC39 for several years.
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