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Enable "useDefineForClassFields" in tsc --init #39311

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@robpalme

Description

@robpalme

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useDefineForClassFields, tsc --init, tsconfig

Suggestion

tsc --init's generated tsconfig.json should include "useDefineForClassFields": true

Use Cases

All major web and non-web engines now ship Define-style semantics.

So the safest approach is to ensure new TypeScript projects use standard web-compatible behavior.

Examples

It looks like we just need to add one line here. I am happy to send a PR.

Checklist

My suggestion meets these guidelines:

  • This wouldn't be a breaking change in existing TypeScript/JavaScript code
  • This wouldn't change the runtime behavior of existing JavaScript code
  • This could be implemented without emitting different JS based on the types of the expressions
  • This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
  • This feature would agree with the rest of TypeScript's Design Goals.

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