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Merge pull request #14874 from Microsoft/fixIndexedAccessRelation
Fix stack overflow in indexed access relation
2 parents 31701b6 + 0b8a9fc commit 1ae5bef

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6 files changed

+294
-32
lines changed

6 files changed

+294
-32
lines changed

‎src/compiler/checker.ts‎

Lines changed: 8 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -8525,16 +8525,9 @@ namespace ts {
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}
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}
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else if (target.flags & TypeFlags.IndexedAccess) {
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// if we have indexed access types with identical index types, see if relationship holds for
8529-
// the two object types.
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if (source.flags & TypeFlags.IndexedAccess && (<IndexedAccessType>source).indexType === (<IndexedAccessType>target).indexType) {
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if (result = isRelatedTo((<IndexedAccessType>source).objectType, (<IndexedAccessType>target).objectType, reportErrors)) {
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return result;
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}
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}
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// A type S is related to a type T[K] if S is related to A[K], where K is string-like and
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// A is the apparent type of S.
8537-
const constraint = getBaseConstraintOfType(target);
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const constraint = getConstraintOfType(<IndexedAccessType>target);
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if (constraint) {
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if (result = isRelatedTo(source, constraint, reportErrors)) {
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errorInfo = saveErrorInfo;
@@ -8581,6 +8574,13 @@ namespace ts {
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return result;
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}
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}
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else if (target.flags & TypeFlags.IndexedAccess && (<IndexedAccessType>source).indexType === (<IndexedAccessType>target).indexType) {
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// if we have indexed access types with identical index types, see if relationship holds for
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// the two object types.
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if (result = isRelatedTo((<IndexedAccessType>source).objectType, (<IndexedAccessType>target).objectType, reportErrors)) {
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return result;
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}
8583+
}
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}
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else {
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if (getObjectFlags(source) & ObjectFlags.Reference && getObjectFlags(target) & ObjectFlags.Reference && (<TypeReference>source).target === (<TypeReference>target).target) {

‎tests/baselines/reference/indexedAccessRelation.js‎

Lines changed: 56 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,56 @@
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//// [indexedAccessRelation.ts]
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// Repro from #14723
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class Component<S> {
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setState<K extends keyof S>(state: Pick<S, K>) {}
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}
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export interface State<T> {
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a?: T;
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}
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class Foo {}
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class Comp<T extends Foo, S> extends Component<S & State<T>>
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{
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foo(a: T) {
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this.setState({ a: a });
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}
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}
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//// [indexedAccessRelation.js]
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// Repro from #14723
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"use strict";
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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exports.__esModule = true;
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var Component = (function () {
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function Component() {
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}
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Component.prototype.setState = function (state) { };
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return Component;
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}());
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var Foo = (function () {
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function Foo() {
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}
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return Foo;
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}());
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var Comp = (function (_super) {
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__extends(Comp, _super);
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function Comp() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Comp.prototype.foo = function (a) {
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this.setState({ a: a });
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};
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return Comp;
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}(Component));

‎tests/baselines/reference/indexedAccessRelation.symbols‎

Lines changed: 53 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,53 @@
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=== tests/cases/compiler/indexedAccessRelation.ts ===
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// Repro from #14723
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class Component<S> {
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>Component : Symbol(Component, Decl(indexedAccessRelation.ts, 0, 0))
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>S : Symbol(S, Decl(indexedAccessRelation.ts, 2, 16))
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setState<K extends keyof S>(state: Pick<S, K>) {}
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>setState : Symbol(Component.setState, Decl(indexedAccessRelation.ts, 2, 20))
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>K : Symbol(K, Decl(indexedAccessRelation.ts, 3, 13))
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>S : Symbol(S, Decl(indexedAccessRelation.ts, 2, 16))
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>state : Symbol(state, Decl(indexedAccessRelation.ts, 3, 32))
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>Pick : Symbol(Pick, Decl(lib.d.ts, --, --))
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>S : Symbol(S, Decl(indexedAccessRelation.ts, 2, 16))
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>K : Symbol(K, Decl(indexedAccessRelation.ts, 3, 13))
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}
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export interface State<T> {
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>State : Symbol(State, Decl(indexedAccessRelation.ts, 4, 1))
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>T : Symbol(T, Decl(indexedAccessRelation.ts, 6, 23))
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a?: T;
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>a : Symbol(State.a, Decl(indexedAccessRelation.ts, 6, 27))
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>T : Symbol(T, Decl(indexedAccessRelation.ts, 6, 23))
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}
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class Foo {}
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>Foo : Symbol(Foo, Decl(indexedAccessRelation.ts, 8, 1))
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class Comp<T extends Foo, S> extends Component<S & State<T>>
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>Comp : Symbol(Comp, Decl(indexedAccessRelation.ts, 10, 12))
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>T : Symbol(T, Decl(indexedAccessRelation.ts, 12, 11))
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>Foo : Symbol(Foo, Decl(indexedAccessRelation.ts, 8, 1))
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>S : Symbol(S, Decl(indexedAccessRelation.ts, 12, 25))
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>Component : Symbol(Component, Decl(indexedAccessRelation.ts, 0, 0))
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>S : Symbol(S, Decl(indexedAccessRelation.ts, 12, 25))
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>State : Symbol(State, Decl(indexedAccessRelation.ts, 4, 1))
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>T : Symbol(T, Decl(indexedAccessRelation.ts, 12, 11))
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{
40+
foo(a: T) {
41+
>foo : Symbol(Comp.foo, Decl(indexedAccessRelation.ts, 13, 1))
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>a : Symbol(a, Decl(indexedAccessRelation.ts, 14, 8))
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>T : Symbol(T, Decl(indexedAccessRelation.ts, 12, 11))
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this.setState({ a: a });
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>this.setState : Symbol(Component.setState, Decl(indexedAccessRelation.ts, 2, 20))
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>this : Symbol(Comp, Decl(indexedAccessRelation.ts, 10, 12))
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>setState : Symbol(Component.setState, Decl(indexedAccessRelation.ts, 2, 20))
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>a : Symbol(a, Decl(indexedAccessRelation.ts, 15, 23))
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>a : Symbol(a, Decl(indexedAccessRelation.ts, 14, 8))
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}
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}
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‎tests/baselines/reference/indexedAccessRelation.types‎

Lines changed: 55 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,55 @@
1+
=== tests/cases/compiler/indexedAccessRelation.ts ===
2+
// Repro from #14723
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class Component<S> {
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>Component : Component<S>
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>S : S
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setState<K extends keyof S>(state: Pick<S, K>) {}
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>setState : <K extends keyof S>(state: Pick<S, K>) => void
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>K : K
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>S : S
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>state : Pick<S, K>
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>Pick : Pick<T, K>
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>S : S
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>K : K
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}
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export interface State<T> {
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>State : State<T>
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>T : T
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22+
a?: T;
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>a : T
24+
>T : T
25+
}
26+
27+
class Foo {}
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>Foo : Foo
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class Comp<T extends Foo, S> extends Component<S & State<T>>
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>Comp : Comp<T, S>
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>T : T
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>Foo : Foo
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>S : S
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>Component : Component<S & State<T>>
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>S : S
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>State : State<T>
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>T : T
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{
40+
foo(a: T) {
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>foo : (a: T) => void
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>a : T
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>T : T
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this.setState({ a: a });
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>this.setState({ a: a }) : void
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>this.setState : <K extends keyof (S & State<T>)>(state: Pick<S & State<T>, K>) => void
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>this : this
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>setState : <K extends keyof (S & State<T>)>(state: Pick<S & State<T>, K>) => void
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>{ a: a } : { a: T; }
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>a : T
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>a : T
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}
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}
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