TypeScript adds a new flag to its compiler: --erasableSyntaxOnly. It ensures you won’t use TypeScript features that generate code you haven’t written.

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TypeScript introduces a new compiler flag, `--erasableSyntaxOnly`, which restricts the use of TypeScript features that generate additional code. This helps avoid excessive code bloat, ensures stable APIs, and improves compatibility with TypeScript subsets. The flag, in conjunction with Node.js, allows TypeScript files to be run without further transpilation by simply erasing type information rather than performing a full transpile.

TypeScript's `--erasableSyntaxOnly` Flag