Microsoft/TypeScript
`typeChecker.getTypeArguments` returns unexpected extra type argument
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#38 391 ouverte le 7 mai 2020
BugDomain: APIHelp Wanted
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Description
TypeScript Version: 3.8.3
Search Terms: getTypeArguments
Code
Given input like
class X extends Y<string> {}
Call typeChecker.getTypeArguments(typeChecker.getTypeAtLocation(...)) on the Y<string> node.
Expected behavior: You get back one type argument (string).
Actual behavior:
You get back two, string and X.
I imagine this is maybe something around how TS handles this typing internally, but as a user of the API I'm not sure I can predict when this function returns these or not.
Playground Link:
Related Issues: https://github.com/microsoft/TypeScript/issues/33693 suggests this API changed recently