Enable CFA on this keyword unconditionally #21490
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sandersn
approved these changes
Feb 2, 2018
| @@ -13317,13 +13317,13 @@ namespace ts { | |||
| .expression; // x | |||
| const classSymbol = checkExpression(className).symbol; | |||
| if (classSymbol && classSymbol.members && (classSymbol.flags & SymbolFlags.Function)) { | |||
| return getInferredClassType(classSymbol); | |||
| return getFlowTypeOfReference(node, getInferredClassType(classSymbol)); | |||
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Can you find out if there’s a performance hit for this PR? I would expect this line especially to be costly, since there are probably a lot of this.property references in an OO codebase.
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Never mind, I looked the file locally, outside github’s 3 lines of context, and see that this is for JS.
| @@ -0,0 +1,39 @@ | |||
| === tests/cases/compiler/controlFlowAnalysisOnBareThisKeyword.ts === | |||
| declare function isBig(x: any): x is { big: true }; | |||
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Shouldn’t there be way more type differences than this, since we are now narrowing this in classes? Maybe I’m missing something about the actual change.
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[Later] Yes, I did. But github doesn’t display the “Are you sure you want to delete your comment?” message on the iPad, so I can’t delete it.
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Fixes #21248
We already generated these types if, for example, you say
this.prop- we just didn't reflect the narrowed types on the types of the barethisreference if thethiswasn't supplied by a class declaration.