Propagate saved variance flags from cached comparisons

src/compiler/checker.ts

@@ -12981,6 +12981,18 @@ namespace ts {
                 return result;
             }
 
+            function propagateSidebandVarianceFlags(typeArguments: readonly Type[], variances: VarianceFlags[]) {
+                for (let i = 0; i < variances.length; i++) {
+                    const v = variances[i];
+                    if (v & VarianceFlags.Unmeasurable) {
+                        instantiateType(typeArguments[i], reportUnmeasurableMarkers);
+                    }
+                    if (v & VarianceFlags.Unreliable) {
+                        instantiateType(typeArguments[i], reportUnreliableMarkers);
+                    }
+                }
+            }
+
             // Determine if possibly recursive types are related. First, check if the result is already available in the global cache.
             // Second, check if we have already started a comparison of the given two types in which case we assume the result to be true.
             // Third, check if both types are part of deeply nested chains of generic type instantiations and if so assume the types are
@@ -12998,6 +13010,16 @@ namespace ts {
                         // as a failure, and should be updated as a reported failure by the bottom of this function.
                     }
                     else {
+                        if (outofbandVarianceMarkerHandler) {
+                            // We're in the middle of variance checking - integrate any unmeasurable/unreliable flags from this cached component
+                            if (source.flags & (TypeFlags.Object | TypeFlags.Conditional) && source.aliasSymbol &&
+                            source.aliasTypeArguments && source.aliasSymbol === target.aliasSymbol) {
+                                propagateSidebandVarianceFlags(source.aliasTypeArguments, getAliasVariances(source.aliasSymbol));
+                            }
+                            if (getObjectFlags(source) & ObjectFlags.Reference && getObjectFlags(target) & ObjectFlags.Reference && (<TypeReference>source).target === (<TypeReference>target).target && length((<TypeReference>source).typeArguments)) {
+                                propagateSidebandVarianceFlags((<TypeReference>source).typeArguments!, getVariances((<TypeReference>source).target));
+                            }
+                        }
                         return related === RelationComparisonResult.Succeeded ? Ternary.True : Ternary.False;
                     }
                 }
@@ -14070,12 +14092,6 @@ namespace ts {
                         if (unreliable) {
                             variance |= VarianceFlags.Unreliable;
                         }
-                        const covariantID = getRelationKey(typeWithSub, typeWithSuper, assignableRelation);
-                        const contravariantID = getRelationKey(typeWithSuper, typeWithSub, assignableRelation);
-                        // We delete the results of these checks, as we want them to actually be run, see the `Unmeasurable` variance we cache,
-                        // And then fall back to a structural result.
-                        assignableRelation.delete(covariantID);
-                        assignableRelation.delete(contravariantID);
                     }
                     variances.push(variance);
                 }

tests/baselines/reference/identicalTypesNoDifferByCheckOrder.js

@@ -0,0 +1,55 @@
+//// [identicalTypesNoDifferByCheckOrder.ts]
+interface SomeProps {
+    x?: string;
+    y?: number;
+    renderAs?: FunctionComponent1<SomeProps>
+}
+
+type SomePropsX = Required<Pick<SomeProps, "x">> & Omit<SomeProps, "x">;
+
+interface SomePropsClone {
+    x?: string;
+    y?: number;
+    renderAs?: FunctionComponent2<SomeProps>
+}
+
+type SomePropsCloneX = Required<Pick<SomePropsClone, "x">> & Omit<SomePropsClone, "x">;
+
+type Validator<T> = {(): boolean, opt?: T};
+type WeakValidationMap<T> = {[K in keyof T]?: null extends T[K] ? Validator<T[K] | null | undefined> : Validator<T[K]>};
+
+interface FunctionComponent1<P> {
+    (props: P & { children?: unknown }): void;
+    propTypes?: WeakValidationMap<P>;
+}
+
+interface FunctionComponent2<P> {
+    (props: P & { children?: unknown }): void;
+    propTypes?: WeakValidationMap<P>;
+}
+
+function needsComponentOfSomeProps3(...x: SomePropsClone[]): void {}
+const comp3: FunctionComponent2<SomePropsCloneX> = null as any;
+needsComponentOfSomeProps3({ renderAs: comp3 });
+
+function needsComponentOfSomeProps2(...x: SomeProps[]): void {}
+const comp2: FunctionComponent1<SomePropsX> = null as any;
+needsComponentOfSomeProps2({ renderAs: comp2 });
+
+//// [identicalTypesNoDifferByCheckOrder.js]
+function needsComponentOfSomeProps3() {
+    var x = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        x[_i] = arguments[_i];
+    }
+}
+var comp3 = null;
+needsComponentOfSomeProps3({ renderAs: comp3 });
+function needsComponentOfSomeProps2() {
+    var x = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        x[_i] = arguments[_i];
+    }
+}
+var comp2 = null;
+needsComponentOfSomeProps2({ renderAs: comp2 });

tests/baselines/reference/identicalTypesNoDifferByCheckOrder.symbols

@@ -0,0 +1,127 @@
+=== tests/cases/compiler/identicalTypesNoDifferByCheckOrder.ts ===
+interface SomeProps {
+>SomeProps : Symbol(SomeProps, Decl(identicalTypesNoDifferByCheckOrder.ts, 0, 0))
+
+    x?: string;
+>x : Symbol(SomeProps.x, Decl(identicalTypesNoDifferByCheckOrder.ts, 0, 21))
+
+    y?: number;
+>y : Symbol(SomeProps.y, Decl(identicalTypesNoDifferByCheckOrder.ts, 1, 15))
+
+    renderAs?: FunctionComponent1<SomeProps>
+>renderAs : Symbol(SomeProps.renderAs, Decl(identicalTypesNoDifferByCheckOrder.ts, 2, 15))
+>FunctionComponent1 : Symbol(FunctionComponent1, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 120))
+>SomeProps : Symbol(SomeProps, Decl(identicalTypesNoDifferByCheckOrder.ts, 0, 0))
+}
+
+type SomePropsX = Required<Pick<SomeProps, "x">> & Omit<SomeProps, "x">;
+>SomePropsX : Symbol(SomePropsX, Decl(identicalTypesNoDifferByCheckOrder.ts, 4, 1))
+>Required : Symbol(Required, Decl(lib.es5.d.ts, --, --))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>SomeProps : Symbol(SomeProps, Decl(identicalTypesNoDifferByCheckOrder.ts, 0, 0))
+>Omit : Symbol(Omit, Decl(lib.es5.d.ts, --, --))
+>SomeProps : Symbol(SomeProps, Decl(identicalTypesNoDifferByCheckOrder.ts, 0, 0))
+
+interface SomePropsClone {
+>SomePropsClone : Symbol(SomePropsClone, Decl(identicalTypesNoDifferByCheckOrder.ts, 6, 72))
+
+    x?: string;
+>x : Symbol(SomePropsClone.x, Decl(identicalTypesNoDifferByCheckOrder.ts, 8, 26))
+
+    y?: number;
+>y : Symbol(SomePropsClone.y, Decl(identicalTypesNoDifferByCheckOrder.ts, 9, 15))
+
+    renderAs?: FunctionComponent2<SomeProps>
+>renderAs : Symbol(SomePropsClone.renderAs, Decl(identicalTypesNoDifferByCheckOrder.ts, 10, 15))
+>FunctionComponent2 : Symbol(FunctionComponent2, Decl(identicalTypesNoDifferByCheckOrder.ts, 22, 1))
+>SomeProps : Symbol(SomeProps, Decl(identicalTypesNoDifferByCheckOrder.ts, 0, 0))
+}
+
+type SomePropsCloneX = Required<Pick<SomePropsClone, "x">> & Omit<SomePropsClone, "x">;
+>SomePropsCloneX : Symbol(SomePropsCloneX, Decl(identicalTypesNoDifferByCheckOrder.ts, 12, 1))
+>Required : Symbol(Required, Decl(lib.es5.d.ts, --, --))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>SomePropsClone : Symbol(SomePropsClone, Decl(identicalTypesNoDifferByCheckOrder.ts, 6, 72))
+>Omit : Symbol(Omit, Decl(lib.es5.d.ts, --, --))
+>SomePropsClone : Symbol(SomePropsClone, Decl(identicalTypesNoDifferByCheckOrder.ts, 6, 72))
+
+type Validator<T> = {(): boolean, opt?: T};
+>Validator : Symbol(Validator, Decl(identicalTypesNoDifferByCheckOrder.ts, 14, 87))
+>T : Symbol(T, Decl(identicalTypesNoDifferByCheckOrder.ts, 16, 15))
+>opt : Symbol(opt, Decl(identicalTypesNoDifferByCheckOrder.ts, 16, 33))
+>T : Symbol(T, Decl(identicalTypesNoDifferByCheckOrder.ts, 16, 15))
+
+type WeakValidationMap<T> = {[K in keyof T]?: null extends T[K] ? Validator<T[K] | null | undefined> : Validator<T[K]>};
+>WeakValidationMap : Symbol(WeakValidationMap, Decl(identicalTypesNoDifferByCheckOrder.ts, 16, 43))
+>T : Symbol(T, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 23))
+>K : Symbol(K, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 30))
+>T : Symbol(T, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 23))
+>T : Symbol(T, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 23))
+>K : Symbol(K, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 30))
+>Validator : Symbol(Validator, Decl(identicalTypesNoDifferByCheckOrder.ts, 14, 87))
+>T : Symbol(T, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 23))
+>K : Symbol(K, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 30))
+>Validator : Symbol(Validator, Decl(identicalTypesNoDifferByCheckOrder.ts, 14, 87))
+>T : Symbol(T, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 23))
+>K : Symbol(K, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 30))
+
+interface FunctionComponent1<P> {
+>FunctionComponent1 : Symbol(FunctionComponent1, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 120))
+>P : Symbol(P, Decl(identicalTypesNoDifferByCheckOrder.ts, 19, 29))
+
+    (props: P & { children?: unknown }): void;
+>props : Symbol(props, Decl(identicalTypesNoDifferByCheckOrder.ts, 20, 5))
+>P : Symbol(P, Decl(identicalTypesNoDifferByCheckOrder.ts, 19, 29))
+>children : Symbol(children, Decl(identicalTypesNoDifferByCheckOrder.ts, 20, 17))
+
+    propTypes?: WeakValidationMap<P>;
+>propTypes : Symbol(FunctionComponent1.propTypes, Decl(identicalTypesNoDifferByCheckOrder.ts, 20, 46))
+>WeakValidationMap : Symbol(WeakValidationMap, Decl(identicalTypesNoDifferByCheckOrder.ts, 16, 43))
+>P : Symbol(P, Decl(identicalTypesNoDifferByCheckOrder.ts, 19, 29))
+}
+
+interface FunctionComponent2<P> {
+>FunctionComponent2 : Symbol(FunctionComponent2, Decl(identicalTypesNoDifferByCheckOrder.ts, 22, 1))
+>P : Symbol(P, Decl(identicalTypesNoDifferByCheckOrder.ts, 24, 29))
+
+    (props: P & { children?: unknown }): void;
+>props : Symbol(props, Decl(identicalTypesNoDifferByCheckOrder.ts, 25, 5))
+>P : Symbol(P, Decl(identicalTypesNoDifferByCheckOrder.ts, 24, 29))
+>children : Symbol(children, Decl(identicalTypesNoDifferByCheckOrder.ts, 25, 17))
+
+    propTypes?: WeakValidationMap<P>;
+>propTypes : Symbol(FunctionComponent2.propTypes, Decl(identicalTypesNoDifferByCheckOrder.ts, 25, 46))
+>WeakValidationMap : Symbol(WeakValidationMap, Decl(identicalTypesNoDifferByCheckOrder.ts, 16, 43))
+>P : Symbol(P, Decl(identicalTypesNoDifferByCheckOrder.ts, 24, 29))
+}
+
+function needsComponentOfSomeProps3(...x: SomePropsClone[]): void {}
+>needsComponentOfSomeProps3 : Symbol(needsComponentOfSomeProps3, Decl(identicalTypesNoDifferByCheckOrder.ts, 27, 1))
+>x : Symbol(x, Decl(identicalTypesNoDifferByCheckOrder.ts, 29, 36))
+>SomePropsClone : Symbol(SomePropsClone, Decl(identicalTypesNoDifferByCheckOrder.ts, 6, 72))
+
+const comp3: FunctionComponent2<SomePropsCloneX> = null as any;
+>comp3 : Symbol(comp3, Decl(identicalTypesNoDifferByCheckOrder.ts, 30, 5))
+>FunctionComponent2 : Symbol(FunctionComponent2, Decl(identicalTypesNoDifferByCheckOrder.ts, 22, 1))
+>SomePropsCloneX : Symbol(SomePropsCloneX, Decl(identicalTypesNoDifferByCheckOrder.ts, 12, 1))
+
+needsComponentOfSomeProps3({ renderAs: comp3 });
+>needsComponentOfSomeProps3 : Symbol(needsComponentOfSomeProps3, Decl(identicalTypesNoDifferByCheckOrder.ts, 27, 1))
+>renderAs : Symbol(renderAs, Decl(identicalTypesNoDifferByCheckOrder.ts, 31, 28))
+>comp3 : Symbol(comp3, Decl(identicalTypesNoDifferByCheckOrder.ts, 30, 5))
+
+function needsComponentOfSomeProps2(...x: SomeProps[]): void {}
+>needsComponentOfSomeProps2 : Symbol(needsComponentOfSomeProps2, Decl(identicalTypesNoDifferByCheckOrder.ts, 31, 48))
+>x : Symbol(x, Decl(identicalTypesNoDifferByCheckOrder.ts, 33, 36))
+>SomeProps : Symbol(SomeProps, Decl(identicalTypesNoDifferByCheckOrder.ts, 0, 0))
+
+const comp2: FunctionComponent1<SomePropsX> = null as any;
+>comp2 : Symbol(comp2, Decl(identicalTypesNoDifferByCheckOrder.ts, 34, 5))
+>FunctionComponent1 : Symbol(FunctionComponent1, Decl(identicalTypesNoDifferByCheckOrder.ts, 17, 120))
+>SomePropsX : Symbol(SomePropsX, Decl(identicalTypesNoDifferByCheckOrder.ts, 4, 1))
+
+needsComponentOfSomeProps2({ renderAs: comp2 });
+>needsComponentOfSomeProps2 : Symbol(needsComponentOfSomeProps2, Decl(identicalTypesNoDifferByCheckOrder.ts, 31, 48))
+>renderAs : Symbol(renderAs, Decl(identicalTypesNoDifferByCheckOrder.ts, 35, 28))
+>comp2 : Symbol(comp2, Decl(identicalTypesNoDifferByCheckOrder.ts, 34, 5))
+

tests/baselines/reference/identicalTypesNoDifferByCheckOrder.types

@@ -0,0 +1,88 @@
+=== tests/cases/compiler/identicalTypesNoDifferByCheckOrder.ts ===
+interface SomeProps {
+    x?: string;
+>x : string | undefined
+
+    y?: number;
+>y : number | undefined
+
+    renderAs?: FunctionComponent1<SomeProps>
+>renderAs : FunctionComponent1<SomeProps> | undefined
+}
+
+type SomePropsX = Required<Pick<SomeProps, "x">> & Omit<SomeProps, "x">;
+>SomePropsX : SomePropsX
+
+interface SomePropsClone {
+    x?: string;
+>x : string | undefined
+
+    y?: number;
+>y : number | undefined
+
+    renderAs?: FunctionComponent2<SomeProps>
+>renderAs : FunctionComponent2<SomeProps> | undefined
+}
+
+type SomePropsCloneX = Required<Pick<SomePropsClone, "x">> & Omit<SomePropsClone, "x">;
+>SomePropsCloneX : SomePropsCloneX
+
+type Validator<T> = {(): boolean, opt?: T};
+>Validator : Validator<T>
+>opt : T | undefined
+
+type WeakValidationMap<T> = {[K in keyof T]?: null extends T[K] ? Validator<T[K] | null | undefined> : Validator<T[K]>};
+>WeakValidationMap : WeakValidationMap<T>
+>null : null
+>null : null
+
+interface FunctionComponent1<P> {
+    (props: P & { children?: unknown }): void;
+>props : P & { children?: unknown; }
+>children : unknown
+
+    propTypes?: WeakValidationMap<P>;
+>propTypes : WeakValidationMap<P> | undefined
+}
+
+interface FunctionComponent2<P> {
+    (props: P & { children?: unknown }): void;
+>props : P & { children?: unknown; }
+>children : unknown
+
+    propTypes?: WeakValidationMap<P>;
+>propTypes : WeakValidationMap<P> | undefined
+}
+
+function needsComponentOfSomeProps3(...x: SomePropsClone[]): void {}
+>needsComponentOfSomeProps3 : (...x: SomePropsClone[]) => void
+>x : SomePropsClone[]
+
+const comp3: FunctionComponent2<SomePropsCloneX> = null as any;
+>comp3 : FunctionComponent2<SomePropsCloneX>
+>null as any : any
+>null : null
+
+needsComponentOfSomeProps3({ renderAs: comp3 });
+>needsComponentOfSomeProps3({ renderAs: comp3 }) : void
+>needsComponentOfSomeProps3 : (...x: SomePropsClone[]) => void
+>{ renderAs: comp3 } : { renderAs: FunctionComponent2<SomePropsCloneX>; }
+>renderAs : FunctionComponent2<SomePropsCloneX>
+>comp3 : FunctionComponent2<SomePropsCloneX>
+
+function needsComponentOfSomeProps2(...x: SomeProps[]): void {}
+>needsComponentOfSomeProps2 : (...x: SomeProps[]) => void
+>x : SomeProps[]
+
+const comp2: FunctionComponent1<SomePropsX> = null as any;
+>comp2 : FunctionComponent1<SomePropsX>
+>null as any : any
+>null : null
+
+needsComponentOfSomeProps2({ renderAs: comp2 });
+>needsComponentOfSomeProps2({ renderAs: comp2 }) : void
+>needsComponentOfSomeProps2 : (...x: SomeProps[]) => void
+>{ renderAs: comp2 } : { renderAs: FunctionComponent1<SomePropsX>; }
+>renderAs : FunctionComponent1<SomePropsX>
+>comp2 : FunctionComponent1<SomePropsX>
+

tests/cases/compiler/identicalTypesNoDifferByCheckOrder.ts

@@ -0,0 +1,38 @@
+// @strictNullChecks: true
+
+interface SomeProps {
+    x?: string;
+    y?: number;
+    renderAs?: FunctionComponent1<SomeProps>
+}
+
+type SomePropsX = Required<Pick<SomeProps, "x">> & Omit<SomeProps, "x">;
+
+interface SomePropsClone {
+    x?: string;
+    y?: number;
+    renderAs?: FunctionComponent2<SomeProps>
+}
+
+type SomePropsCloneX = Required<Pick<SomePropsClone, "x">> & Omit<SomePropsClone, "x">;
+
+type Validator<T> = {(): boolean, opt?: T};
+type WeakValidationMap<T> = {[K in keyof T]?: null extends T[K] ? Validator<T[K] | null | undefined> : Validator<T[K]>};
+
+interface FunctionComponent1<P> {
+    (props: P & { children?: unknown }): void;
+    propTypes?: WeakValidationMap<P>;
+}
+
+interface FunctionComponent2<P> {
+    (props: P & { children?: unknown }): void;
+    propTypes?: WeakValidationMap<P>;
+}
+
+function needsComponentOfSomeProps3(...x: SomePropsClone[]): void {}
+const comp3: FunctionComponent2<SomePropsCloneX> = null as any;
+needsComponentOfSomeProps3({ renderAs: comp3 });
+
+function needsComponentOfSomeProps2(...x: SomeProps[]): void {}
+const comp2: FunctionComponent1<SomePropsX> = null as any;
+needsComponentOfSomeProps2({ renderAs: comp2 });