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RyanCavanaughRyanCavanaugh
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Check target equivalence in isMatchingReference before computing property key equivalence
Fixes microsoft#61606. Need PR results to see if this is worth it or not.
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5 files changed

+194
-3
lines changed

5 files changed

+194
-3
lines changed

‎src/compiler/checker.ts

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -27184,9 +27184,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
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case SyntaxKind.ElementAccessExpression:
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const sourcePropertyName = getAccessedPropertyName(source as AccessExpression);
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if (sourcePropertyName !== undefined) {
27187-
const targetPropertyName = isAccessExpression(target) ? getAccessedPropertyName(target) : undefined;
27188-
if (targetPropertyName !== undefined) {
27189-
return targetPropertyName === sourcePropertyName && isMatchingReference((source as AccessExpression).expression, (target as AccessExpression).expression);
27187+
if (isAccessExpression(target) && isMatchingReference((source as AccessExpression).expression, target.expression)) {
27188+
const targetPropertyName = isAccessExpression(target) ? getAccessedPropertyName(target) : undefined;
27189+
if (targetPropertyName !== undefined) {
27190+
return targetPropertyName === sourcePropertyName;
27191+
}
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}
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}
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if (isElementAccessExpression(source) && isElementAccessExpression(target) && isIdentifier(source.argumentExpression) && isIdentifier(target.argumentExpression)) {

‎tests/baselines/reference/circularRefFromClassMember.js

Lines changed: 40 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,40 @@
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//// [tests/cases/compiler/circularRefFromClassMember.ts] ////
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//// [circularRefFromClassMember.ts]
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// Test for #61606
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const result: boolean[] = [];
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class Test {
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n: 42 | "" = 42 as any;
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foo(): void {
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if (this.n === "") {
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return;
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}
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for (let i = 0; i < 1; i++) {
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const localN = this.n;
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const localN_alias = localN;
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result[localN_alias] = true;
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}
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}
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}
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//// [circularRefFromClassMember.js]
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// Test for #61606
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var result = [];
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var Test = /** @class */ (function () {
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function Test() {
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this.n = 42;
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}
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Test.prototype.foo = function () {
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if (this.n === "") {
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return;
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}
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for (var i = 0; i < 1; i++) {
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var localN = this.n;
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var localN_alias = localN;
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result[localN_alias] = true;
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}
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};
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return Test;
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}());

‎tests/baselines/reference/circularRefFromClassMember.symbols

Lines changed: 46 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,46 @@
1+
//// [tests/cases/compiler/circularRefFromClassMember.ts] ////
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=== circularRefFromClassMember.ts ===
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// Test for #61606
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const result: boolean[] = [];
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>result : Symbol(result, Decl(circularRefFromClassMember.ts, 2, 5))
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class Test {
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>Test : Symbol(Test, Decl(circularRefFromClassMember.ts, 2, 29))
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n: 42 | "" = 42 as any;
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>n : Symbol(Test.n, Decl(circularRefFromClassMember.ts, 3, 12))
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foo(): void {
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>foo : Symbol(Test.foo, Decl(circularRefFromClassMember.ts, 4, 27))
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if (this.n === "") {
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>this.n : Symbol(Test.n, Decl(circularRefFromClassMember.ts, 3, 12))
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>this : Symbol(Test, Decl(circularRefFromClassMember.ts, 2, 29))
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>n : Symbol(Test.n, Decl(circularRefFromClassMember.ts, 3, 12))
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return;
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}
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for (let i = 0; i < 1; i++) {
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>i : Symbol(i, Decl(circularRefFromClassMember.ts, 9, 16))
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>i : Symbol(i, Decl(circularRefFromClassMember.ts, 9, 16))
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>i : Symbol(i, Decl(circularRefFromClassMember.ts, 9, 16))
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const localN = this.n;
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>localN : Symbol(localN, Decl(circularRefFromClassMember.ts, 10, 17))
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>this.n : Symbol(Test.n, Decl(circularRefFromClassMember.ts, 3, 12))
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>this : Symbol(Test, Decl(circularRefFromClassMember.ts, 2, 29))
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>n : Symbol(Test.n, Decl(circularRefFromClassMember.ts, 3, 12))
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const localN_alias = localN;
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>localN_alias : Symbol(localN_alias, Decl(circularRefFromClassMember.ts, 11, 17))
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>localN : Symbol(localN, Decl(circularRefFromClassMember.ts, 10, 17))
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result[localN_alias] = true;
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>result : Symbol(result, Decl(circularRefFromClassMember.ts, 2, 5))
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>localN_alias : Symbol(localN_alias, Decl(circularRefFromClassMember.ts, 11, 17))
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}
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}
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}
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‎tests/baselines/reference/circularRefFromClassMember.types

Lines changed: 87 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,87 @@
1+
//// [tests/cases/compiler/circularRefFromClassMember.ts] ////
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=== circularRefFromClassMember.ts ===
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// Test for #61606
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const result: boolean[] = [];
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>result : boolean[]
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> : ^^^^^^^^^
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>[] : undefined[]
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> : ^^^^^^^^^^^
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class Test {
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>Test : Test
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> : ^^^^
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n: 42 | "" = 42 as any;
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>n : "" | 42
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> : ^^^^^^^
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>42 as any : any
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>42 : 42
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> : ^^
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foo(): void {
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>foo : () => void
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> : ^^^^^^
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if (this.n === "") {
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>this.n === "" : boolean
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> : ^^^^^^^
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>this.n : "" | 42
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> : ^^^^^^^
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>this : this
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> : ^^^^
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>n : "" | 42
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> : ^^^^^^^
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>"" : ""
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> : ^^
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return;
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}
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for (let i = 0; i < 1; i++) {
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>i : number
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> : ^^^^^^
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>0 : 0
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> : ^
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>i < 1 : boolean
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> : ^^^^^^^
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>i : number
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> : ^^^^^^
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>1 : 1
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> : ^
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>i++ : number
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> : ^^^^^^
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>i : number
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> : ^^^^^^
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const localN = this.n;
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>localN : 42
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> : ^^
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>this.n : 42
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> : ^^
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>this : this
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> : ^^^^
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>n : 42
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> : ^^
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const localN_alias = localN;
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>localN_alias : 42
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> : ^^
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>localN : 42
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> : ^^
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result[localN_alias] = true;
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>result[localN_alias] = true : true
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> : ^^^^
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>result[localN_alias] : boolean
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> : ^^^^^^^
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>result : boolean[]
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> : ^^^^^^^^^
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>localN_alias : 42
81+
> : ^^
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>true : true
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> : ^^^^
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}
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}
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}
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‎tests/cases/compiler/circularRefFromClassMember.ts

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,16 @@
1+
// Test for #61606
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3+
const result: boolean[] = [];
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class Test {
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n: 42 | "" = 42 as any;
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foo(): void {
7+
if (this.n === "") {
8+
return;
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}
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for (let i = 0; i < 1; i++) {
11+
const localN = this.n;
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const localN_alias = localN;
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result[localN_alias] = true;
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}
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}
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}

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