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Fixed control flow Analysis of aliased discriminants with parenthesized initializers #61788
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -29247,26 +29247,25 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker { | |
| const symbol = getResolvedSymbol(expr); | ||
| if (isConstantVariable(symbol)) { | ||
| const declaration = symbol.valueDeclaration!; | ||
| let initializer = getCandidateVariableDeclarationInitializer(declaration); | ||
| // Given 'const x = obj.kind', allow 'x' as an alias for 'obj.kind' | ||
| if ( | ||
| isVariableDeclaration(declaration) && !declaration.type && declaration.initializer && isAccessExpression(declaration.initializer) && | ||
| isMatchingReference(reference, declaration.initializer.expression) | ||
| ) { | ||
| return declaration.initializer; | ||
| if (initializer && isAccessExpression(initializer) && isMatchingReference(reference, initializer.expression)) { | ||
| return initializer; | ||
| } | ||
| // Given 'const { kind: x } = obj', allow 'x' as an alias for 'obj.kind' | ||
| if (isBindingElement(declaration) && !declaration.initializer) { | ||
| const parent = declaration.parent.parent; | ||
| if ( | ||
| isVariableDeclaration(parent) && !parent.type && parent.initializer && (isIdentifier(parent.initializer) || isAccessExpression(parent.initializer)) && | ||
| isMatchingReference(reference, parent.initializer) | ||
| ) { | ||
| initializer = getCandidateVariableDeclarationInitializer(declaration.parent.parent); | ||
|
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. To avoid potential misuse, you might explicitly check that Copilot uses AI. Check for mistakes. Positive FeedbackNegative Feedback |
||
| if (initializer && (isIdentifier(initializer) || isAccessExpression(initializer)) && isMatchingReference(reference, initializer)) { | ||
| return declaration; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return undefined; | ||
|
|
||
| function getCandidateVariableDeclarationInitializer(node: Node) { | ||
|
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Add a JSDoc comment above this helper to explain that it skips parentheses and returns an initializer only for untyped variable declarations. Copilot uses AI. Check for mistakes. Positive FeedbackNegative Feedback |
||
| return isVariableDeclaration(node) && !node.type && node.initializer ? skipParentheses(node.initializer) : undefined; | ||
| } | ||
| } | ||
|
|
||
| function getDiscriminantPropertyAccess(expr: Expression, computedType: Type) { | ||
|
|
||
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,292 @@ | ||
| //// [tests/cases/conformance/controlFlow/controlFlowAliasing2.ts] //// | ||
|
|
||
| === controlFlowAliasing2.ts === | ||
| // https://github.com/microsoft/TypeScript/issues/61784 | ||
|
|
||
| type Test = TestA | TestB; | ||
| >Test : Symbol(Test, Decl(controlFlowAliasing2.ts, 0, 0)) | ||
| >TestA : Symbol(TestA, Decl(controlFlowAliasing2.ts, 2, 26)) | ||
| >TestB : Symbol(TestB, Decl(controlFlowAliasing2.ts, 7, 1)) | ||
|
|
||
| interface TestA { | ||
| >TestA : Symbol(TestA, Decl(controlFlowAliasing2.ts, 2, 26)) | ||
|
|
||
| type: 'a'; | ||
| >type : Symbol(TestA.type, Decl(controlFlowAliasing2.ts, 4, 17)) | ||
|
|
||
| name: string; | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| interface TestB { | ||
| >TestB : Symbol(TestB, Decl(controlFlowAliasing2.ts, 7, 1)) | ||
|
|
||
| type: 'b'; | ||
| >type : Symbol(TestB.type, Decl(controlFlowAliasing2.ts, 9, 17)) | ||
|
|
||
| value: number; | ||
| >value : Symbol(TestB.value, Decl(controlFlowAliasing2.ts, 10, 12)) | ||
| } | ||
|
|
||
| function _tcb1(this: { test: Test }) { | ||
| >_tcb1 : Symbol(_tcb1, Decl(controlFlowAliasing2.ts, 12, 1)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 14, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >Test : Symbol(Test, Decl(controlFlowAliasing2.ts, 0, 0)) | ||
|
|
||
| // TS generated by Angular's Type Check block | ||
| const _t1 = (((((this).test)).type)); | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 16, 7)) | ||
| >(((this).test)).type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 14, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
|
|
||
| if (_t1 === "a") { | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 16, 7)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 14, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above, without the parenthesis | ||
| const _t2 = this.test.type; | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 22, 7)) | ||
| >this.test.type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 14, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
|
|
||
| if (_t2 === "a") { | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 22, 7)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 14, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above without parenthesis at both places | ||
| const testType = this.test.type; | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 28, 7)) | ||
| >this.test.type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 14, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
|
|
||
| if (testType === "a") { | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 28, 7)) | ||
|
|
||
| this.test.name; | ||
| >this.test.name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 14, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 14, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
| } | ||
|
|
||
| function _tcb2(this: { test: Test }) { | ||
| >_tcb2 : Symbol(_tcb2, Decl(controlFlowAliasing2.ts, 32, 1)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 34, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >Test : Symbol(Test, Decl(controlFlowAliasing2.ts, 0, 0)) | ||
|
|
||
| // TS generated by Angular's Type Check block | ||
| const _t1 = (((((this).test)).type)); | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 36, 7)) | ||
| >(((this).test)).type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 34, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
|
|
||
| if ("a" === _t1) { | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 36, 7)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 34, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above, without the parenthesis | ||
| const _t2 = this.test.type; | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 42, 7)) | ||
| >this.test.type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 34, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
|
|
||
| if ("a" === _t2) { | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 42, 7)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 34, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above without parenthesis at both places | ||
| const testType = this.test.type; | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 48, 7)) | ||
| >this.test.type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 34, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
|
|
||
| if ("a" === testType) { | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 48, 7)) | ||
|
|
||
| this.test.name; | ||
| >this.test.name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 34, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 34, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
| } | ||
|
|
||
| function _tcb3(this: { test: Test }) { | ||
| >_tcb3 : Symbol(_tcb3, Decl(controlFlowAliasing2.ts, 52, 1)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 54, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >Test : Symbol(Test, Decl(controlFlowAliasing2.ts, 0, 0)) | ||
|
|
||
| const { type: _t1 } = (((((this).test)))); | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 55, 9)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 54, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
|
|
||
| if (_t1 === "a") { | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 55, 9)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 54, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above, without the parenthesis | ||
| const { type: _t2 } = this.test; | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 61, 9)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 54, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
|
|
||
| if (_t2 === "a") { | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 61, 9)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 54, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above without parenthesis at both places | ||
| const { type: testType } = this.test; | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 67, 9)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 54, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
|
|
||
| if (testType === "a") { | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 67, 9)) | ||
|
|
||
| this.test.name; | ||
| >this.test.name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 54, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 54, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
| } | ||
|
|
||
| function _tcb4(this: { test: Test }) { | ||
| >_tcb4 : Symbol(_tcb4, Decl(controlFlowAliasing2.ts, 71, 1)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 73, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >Test : Symbol(Test, Decl(controlFlowAliasing2.ts, 0, 0)) | ||
|
|
||
| const { type: _t1 } = (((((this).test)))); | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 74, 9)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 73, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
|
|
||
| if ("a" === _t1) { | ||
| >_t1 : Symbol(_t1, Decl(controlFlowAliasing2.ts, 74, 9)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 73, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above, without the parenthesis | ||
| const { type: _t2 } = this.test; | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 80, 9)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 73, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
|
|
||
| if ("a" === _t2) { | ||
| >_t2 : Symbol(_t2, Decl(controlFlowAliasing2.ts, 80, 9)) | ||
|
|
||
| (((((this).test)).name)); | ||
| >(((this).test)).name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >(this).test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 73, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
|
|
||
| // Same as above without parenthesis at both places | ||
| const { type: testType } = this.test; | ||
| >type : Symbol(type, Decl(controlFlowAliasing2.ts, 4, 17), Decl(controlFlowAliasing2.ts, 9, 17)) | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 86, 9)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 73, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
|
|
||
| if ("a" === testType) { | ||
| >testType : Symbol(testType, Decl(controlFlowAliasing2.ts, 86, 9)) | ||
|
|
||
| this.test.name; | ||
| >this.test.name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| >this.test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >this : Symbol(this, Decl(controlFlowAliasing2.ts, 73, 15)) | ||
| >test : Symbol(test, Decl(controlFlowAliasing2.ts, 73, 22)) | ||
| >name : Symbol(TestA.name, Decl(controlFlowAliasing2.ts, 5, 12)) | ||
| } | ||
| } | ||
|
|
||
| export {}; | ||
|
|
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[nitpick] Instead of reusing
initializerfor both branches, consider using separate variables (e.g.,directInitanddestructuredInit) to clarify the two distinct alias checks.Copilot uses AI. Check for mistakes.