Test "chaining" of X-TypeScript-Types headers. #4386
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Refs denoland#4184 Refs denoland#4040 In denoland#4040 we changed the way JavaScript dependencies are analysed in the TypeScript compiler. When we encounter a JavaScript file that doesn't have any types, and `checkJs` is disabled, we stop the analysis. This caused situations where when there was a typed file, loading an untyped file, loading a typed file, we stop the analysis. We didn't specifically check this "chaining" behaviour in our tests, and there were situations in the while where this behaviour was a regression, so this introduces test to ensure the behaviour as designed is preserved.
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Refs #4184
Refs #4040
In #4040 we changed the way JavaScript dependencies are analysed in the TypeScript compiler. When we encounter a JavaScript file that doesn't have any types, and
checkJsis disabled, we stop the analysis. This caused situations where when there was a typed file, loading an untyped file, loading a typed file, we stop the analysis. We didn't specifically check this "chaining" behaviour in our tests, and there were situations in the while where this behaviour was a regression, so this introduces test to ensure the behaviour as designed is preserved.