TypeScript 4.0 arrives with performance boosts

TypeScript 4.0 arrives with performance boosts

TypeScript 4.0 boosts speed in the build mode, with the caching of semantic diagnostics in the builder written to the disk with .tsbuildinfo, to benefit the next incremental build.

TypeScript 4.0, a major upgrade to Microsoft’s popular typed superset of JavaScript, is now available as a production release, with improvements for builds and editing scenarios as well as support for variadic tuple types. The TypeScript 4.0 production release arrived August 20.

TypeScript 4.0 boosts speed in the build mode, with the caching of semantic diagnostics in the builder written to the disk with .tsbuildinfo, to benefit the next incremental build. This is intended to fix a situation in which compiling a program after a previous compile with errors under --incremental would be very slow when using the --noEmitOnError flag.

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Further, new JavaScript/TypeScript functionality improves editing scenarios in Visual Studio Code and Visual Studio 2017/2019. A new partial editing mode at startup addresses slow startup times, particularly on bigger projects. A smarter auto-imports capability does extra work in editor scenarios to include packages listed in the package.json’s dependencies field. Information from these packages is used to improve auto-imports while not changing anything like type-checking.

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