TypeScript 5.8's new erasableSyntaxOnly flag enforces pure type annotations by disabling enums, namespaces, and parameter properties.

Anja Petry

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TypeScript 5.8 introduces a new flag called erasableSyntaxOnly that disables features like enums, namespaces, and class parameter properties, marking them as errors. This ensures easier handling for bundlers, especially with Node's recent TypeScript support. The TypeScript team is considering a future where such syntax is obsolete, and types could be treated as comments in JavaScript. While import aliases won't work with this flag, using package.json imports is recommended.

TypeScript 5.8 Ships --erasableSyntaxOnly To Disable Enums

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<p>The TypeScript team is considering a future where such syntax is obsolete</p>
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<p>Obsolete maybe but I don’t see them stop supporting it as those specific syntaxes are kinda heavily used…</p>
