Guard against recursion in inferTypeForHomomorphicMappedType #38224
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Heya @ahejlsberg, I've started to run the extended test suite on this PR at 8648986. You can monitor the build here. |
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Heya @ahejlsberg, I've started to run the parallelized community code test suite on this PR at 8648986. You can monitor the build here. |
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Heya @ahejlsberg, I've started to run the parallelized Definitely Typed test suite on this PR at 8648986. You can monitor the build here. |
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Test runs all appear to be clean (issues are preexisting conditions). |
| */ | ||
| function inferTypeForHomomorphicMappedType(source: Type, target: MappedType, constraint: IndexType): Type | undefined { | ||
| if (inInferTypeForHomomorphicMappedType) { | ||
| return undefined; |
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Do we need to cache this inference failure, as in invokeOnce, so if it's attempted again on the same types outside the same recursive context (but during the same traversal) we still refuse to perform the secondary inference?
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I don't think so. In the general case this function is never recursive. The only code paths that could recur are special cases for array and tuple types, so we're talking something that happens very rarely. I think this simple solution is fine.
Fixes #38198.