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absolutely nobody used those outside of a language demo. We also got --erasableSyntaxOnly last year to remove them from the language. The TS team considers them “mistakes“ for a really long time now

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Thanks for the correction! It was a long time ago that I used TypeScript, and making things worse (for my memory) it was an Angular project.

So today, most people and teams avoid the parts of TS that require compilation into different JS, and --erasableSyntaxOnly lets you enforce this, right?

Exactly. There is plenty of code change however introduced by bundlers who do “bundling“, polyfill injection, minification, this kind of stuff.

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