🤖 Cherry-pick PR #34706 into release-3.7#34708
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sandersn merged 1 commit intomicrosoft:release-3.7from Oct 24, 2019
Merged
🤖 Cherry-pick PR #34706 into release-3.7#34708sandersn merged 1 commit intomicrosoft:release-3.7from
sandersn merged 1 commit intomicrosoft:release-3.7from
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Component commits: 056a656 Restore delayed merge check to getTypeFromJSDocValueReference This is needed when a function merges with a prototype assignment. The resulting *merged* symbol is a constructor function marked with SymbolFlags.Class. However, the merge doesn't happen until getTypeOfFuncClassEnumModule is called, which, in the getTypeReferenceType code path, doesn't happen until getTypeFromJSDocValueReference. That means the check for SymbolFlags.Class is missed. Previously, getTypeFromJSDocValueReference had a weird check `symbol !== getTypeOfSymbol(symbol).symbol`, which, if true, ran getTypeReferenceType again on `getTypeOfSymbol(symbol).symbol`. For JS "aliases", this had the effect of dereferencing the alias, and for function-prototype merges, this had the effect of ... just trying again after the merge had happened. This is a confusing way to run things. getTypeReferenceType should instead detect a function-prototype merge, cause it to happen, and *then* run the rest of its code instead of relying on try-again logic at the very end. However, for the RC, I want to fix this code by restoring the old check, with an additional check to make sure that microsoft#33106 doesn't break again: ```ts const valueType = getTypeOfSymbol(symbol) symbol !== valueType.symbol && getMergedSymbol(symbol) === valueType.symbol ``` I'll work on the real fix afterwards and put it into 3.8. d1515f4 Add bug number
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This cherry-pick was triggerd by a request on #34706
Please review the diff and merge if no changes are unexpected.
You can view the cherry-pick log here.
cc @sandersn