Extract types from object literals instead of using the type checker. #60540
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jakebailey
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Nov 25, 2024
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| const symbolType = getTypeOfSymbol(symbol); | ||
| if (widen) { | ||
| type = instantiateType(getWidenedType(symbolType), context.mapper); | ||
| } | ||
| else { | ||
| type = symbol && !(symbol.flags & (SymbolFlags.TypeLiteral | SymbolFlags.Signature)) | ||
| ? instantiateType(getWidenedLiteralType(symbolType), context.mapper) | ||
| : errorType; | ||
| } |
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Seems like this could be just:
Suggested change
| const symbolType = getTypeOfSymbol(symbol); | |
| if (widen) { | |
| type = instantiateType(getWidenedType(symbolType), context.mapper); | |
| } | |
| else { | |
| type = symbol && !(symbol.flags & (SymbolFlags.TypeLiteral | SymbolFlags.Signature)) | |
| ? instantiateType(getWidenedLiteralType(symbolType), context.mapper) | |
| : errorType; | |
| } | |
| type = widen || (symbol && !(symbol.flags & (SymbolFlags.TypeLiteral | SymbolFlags.Signature))) | |
| ? instantiateType(getWidenedLiteralType(getTypeOfSymbol(symbol)), context.mapper) | |
| : errorType; |
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(the original code with one more expression)
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This PR brings TS emit closer to what an external tool could emit without type information by extracting object type directly from their source object literal where possible.