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Port anyFunctionType subtype fix and JSX children NonInferrableType propagation from typescript-go by Copilot · Pull Request #63163 · microsoft/TypeScript · GitHub

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Port anyFunctionType subtype fix and JSX children NonInferrableType propagation from typescript-go #63163

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Merged
Daniel Rosenwasser (DanielRosenwasser) merged 2 commits into from
Mar 3, 2026
Conversation 21 Commits 2 Checks 23 Files changed
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Port anyFunctionType subtype fix and JSX children NonInferrableType propagation from typescript-go #63163

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Initial plan
Copilot Feb 19, 2026
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Port typescript-go PRs: anyFunctionType subtype fix and JSX children …
Copilot Feb 19, 2026
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8 changes: 6 additions & 2 deletions src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -24603,9 +24603,13 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (relation === identityRelation) {
return signaturesIdenticalTo(source, target, kind);
}
if (target === anyFunctionType || source === anyFunctionType) {
// With respect to signatures, the anyFunctionType wildcard is a subtype of every other function type.
if (source === anyFunctionType) {
return Ternary.True;
}
if (target === anyFunctionType) {
return Ternary.False;
}

const sourceIsJSConstructor = source.symbol && isJSConstructor(source.symbol.valueDeclaration);
const targetIsJSConstructor = target.symbol && isJSConstructor(target.symbol.valueDeclaration);
Expand Down Expand Up @@ -33925,7 +33929,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
childrenPropSymbol.valueDeclaration.symbol = childrenPropSymbol;
const childPropMap = createSymbolTable();
childPropMap.set(jsxChildrenPropertyName, childrenPropSymbol);
spread = getSpreadType(spread, createAnonymousType(attributesSymbol, childPropMap, emptyArray, emptyArray, emptyArray), attributesSymbol, objectFlags, /*readonly*/ false);
spread = getSpreadType(spread, createAnonymousType(attributesSymbol, childPropMap, emptyArray, emptyArray, emptyArray), attributesSymbol, objectFlags | getPropagatingFlagsOfTypes(childrenTypes), /*readonly*/ false);
}
}

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186 changes: 186 additions & 0 deletions tests/baselines/reference/contextuallyTypedJsxChildren2.symbols
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@@ -0,0 +1,186 @@
//// [tests/cases/compiler/contextuallyTypedJsxChildren2.tsx] ////

=== contextuallyTypedJsxChildren2.tsx ===
/// <reference path="react16.d.ts" />

// https://github.com/microsoft/typescript-go/issues/2802

import * as React from 'react';
>React : Symbol(React, Decl(contextuallyTypedJsxChildren2.tsx, 4, 6))

declare const TestComponentWithChildren: <T, TParam>(props: {
>TestComponentWithChildren : Symbol(TestComponentWithChildren, Decl(contextuallyTypedJsxChildren2.tsx, 6, 13))
>T : Symbol(T, Decl(contextuallyTypedJsxChildren2.tsx, 6, 42))
>TParam : Symbol(TParam, Decl(contextuallyTypedJsxChildren2.tsx, 6, 44))
>props : Symbol(props, Decl(contextuallyTypedJsxChildren2.tsx, 6, 53))

state: T;
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 6, 61))
>T : Symbol(T, Decl(contextuallyTypedJsxChildren2.tsx, 6, 42))

selector?: (state: NoInfer<T>) => TParam;
>selector : Symbol(selector, Decl(contextuallyTypedJsxChildren2.tsx, 7, 11))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 8, 14))
>NoInfer : Symbol(NoInfer, Decl(lib.es5.d.ts, --, --))
>T : Symbol(T, Decl(contextuallyTypedJsxChildren2.tsx, 6, 42))
>TParam : Symbol(TParam, Decl(contextuallyTypedJsxChildren2.tsx, 6, 44))

children?: (state: NoInfer<TParam>) => React.ReactElement<any> | null;
>children : Symbol(children, Decl(contextuallyTypedJsxChildren2.tsx, 8, 43))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 9, 14))
>NoInfer : Symbol(NoInfer, Decl(lib.es5.d.ts, --, --))
>TParam : Symbol(TParam, Decl(contextuallyTypedJsxChildren2.tsx, 6, 44))
>React : Symbol(React, Decl(contextuallyTypedJsxChildren2.tsx, 4, 6))
>ReactElement : Symbol(React.ReactElement, Decl(react16.d.ts, 135, 9))

}) => React.ReactElement<any>;
>React : Symbol(React, Decl(contextuallyTypedJsxChildren2.tsx, 4, 6))
>ReactElement : Symbol(React.ReactElement, Decl(react16.d.ts, 135, 9))

declare const TestComponentWithoutChildren: <T, TParam>(props: {
>TestComponentWithoutChildren : Symbol(TestComponentWithoutChildren, Decl(contextuallyTypedJsxChildren2.tsx, 12, 13))
>T : Symbol(T, Decl(contextuallyTypedJsxChildren2.tsx, 12, 45))
>TParam : Symbol(TParam, Decl(contextuallyTypedJsxChildren2.tsx, 12, 47))
>props : Symbol(props, Decl(contextuallyTypedJsxChildren2.tsx, 12, 56))

state: T;
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 12, 64))
>T : Symbol(T, Decl(contextuallyTypedJsxChildren2.tsx, 12, 45))

selector?: (state: NoInfer<T>) => TParam;
>selector : Symbol(selector, Decl(contextuallyTypedJsxChildren2.tsx, 13, 11))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 14, 14))
>NoInfer : Symbol(NoInfer, Decl(lib.es5.d.ts, --, --))
>T : Symbol(T, Decl(contextuallyTypedJsxChildren2.tsx, 12, 45))
>TParam : Symbol(TParam, Decl(contextuallyTypedJsxChildren2.tsx, 12, 47))

notChildren?: (state: NoInfer<TParam>) => React.ReactElement<any> | null;
>notChildren : Symbol(notChildren, Decl(contextuallyTypedJsxChildren2.tsx, 14, 43))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 15, 17))
>NoInfer : Symbol(NoInfer, Decl(lib.es5.d.ts, --, --))
>TParam : Symbol(TParam, Decl(contextuallyTypedJsxChildren2.tsx, 12, 47))
>React : Symbol(React, Decl(contextuallyTypedJsxChildren2.tsx, 4, 6))
>ReactElement : Symbol(React.ReactElement, Decl(react16.d.ts, 135, 9))

}) => React.ReactElement<any>;
>React : Symbol(React, Decl(contextuallyTypedJsxChildren2.tsx, 4, 6))
>ReactElement : Symbol(React.ReactElement, Decl(react16.d.ts, 135, 9))

const App = () => {
>App : Symbol(App, Decl(contextuallyTypedJsxChildren2.tsx, 18, 5))

return (
<>
<TestComponentWithChildren state={{ foo: 123 }} selector={(state) => state.foo}>
>TestComponentWithChildren : Symbol(TestComponentWithChildren, Decl(contextuallyTypedJsxChildren2.tsx, 6, 13))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 21, 32))
>foo : Symbol(foo, Decl(contextuallyTypedJsxChildren2.tsx, 21, 41))
>selector : Symbol(selector, Decl(contextuallyTypedJsxChildren2.tsx, 21, 53))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 21, 65))
>state.foo : Symbol(foo, Decl(contextuallyTypedJsxChildren2.tsx, 21, 41))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 21, 65))
>foo : Symbol(foo, Decl(contextuallyTypedJsxChildren2.tsx, 21, 41))

{(selected) => <div>{Math.max(selected, 0)}</div>}
>selected : Symbol(selected, Decl(contextuallyTypedJsxChildren2.tsx, 22, 10))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react16.d.ts, 2548, 114))
>Math.max : Symbol(Math.max, Decl(lib.es5.d.ts, --, --))
>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
>max : Symbol(Math.max, Decl(lib.es5.d.ts, --, --))
>selected : Symbol(selected, Decl(contextuallyTypedJsxChildren2.tsx, 22, 10))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react16.d.ts, 2548, 114))

</TestComponentWithChildren>
>TestComponentWithChildren : Symbol(TestComponentWithChildren, Decl(contextuallyTypedJsxChildren2.tsx, 6, 13))

<TestComponentWithoutChildren
>TestComponentWithoutChildren : Symbol(TestComponentWithoutChildren, Decl(contextuallyTypedJsxChildren2.tsx, 12, 13))

state={{ foo: 123 }}
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 25, 35))
>foo : Symbol(foo, Decl(contextuallyTypedJsxChildren2.tsx, 26, 16))

selector={(state) => state.foo}
>selector : Symbol(selector, Decl(contextuallyTypedJsxChildren2.tsx, 26, 28))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 27, 19))
>state.foo : Symbol(foo, Decl(contextuallyTypedJsxChildren2.tsx, 26, 16))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 27, 19))
>foo : Symbol(foo, Decl(contextuallyTypedJsxChildren2.tsx, 26, 16))

notChildren={(selected) => <div>{Math.max(selected, 0)}</div>}
>notChildren : Symbol(notChildren, Decl(contextuallyTypedJsxChildren2.tsx, 27, 39))
>selected : Symbol(selected, Decl(contextuallyTypedJsxChildren2.tsx, 28, 22))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react16.d.ts, 2548, 114))
>Math.max : Symbol(Math.max, Decl(lib.es5.d.ts, --, --))
>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
>max : Symbol(Math.max, Decl(lib.es5.d.ts, --, --))
>selected : Symbol(selected, Decl(contextuallyTypedJsxChildren2.tsx, 28, 22))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react16.d.ts, 2548, 114))

/>
</>
);
};

// https://github.com/microsoft/typescript-go/issues/2797

interface State {
>State : Symbol(State, Decl(contextuallyTypedJsxChildren2.tsx, 32, 2))

value: boolean
>value : Symbol(State.value, Decl(contextuallyTypedJsxChildren2.tsx, 36, 17))
}

declare const Subscribe: <TSelected = State>(props: {
>Subscribe : Symbol(Subscribe, Decl(contextuallyTypedJsxChildren2.tsx, 40, 13))
>TSelected : Symbol(TSelected, Decl(contextuallyTypedJsxChildren2.tsx, 40, 26))
>State : Symbol(State, Decl(contextuallyTypedJsxChildren2.tsx, 32, 2))
>props : Symbol(props, Decl(contextuallyTypedJsxChildren2.tsx, 40, 45))

selector?: (state: State) => TSelected
>selector : Symbol(selector, Decl(contextuallyTypedJsxChildren2.tsx, 40, 53))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 41, 14))
>State : Symbol(State, Decl(contextuallyTypedJsxChildren2.tsx, 32, 2))
>TSelected : Symbol(TSelected, Decl(contextuallyTypedJsxChildren2.tsx, 40, 26))

children: (state: TSelected) => void
>children : Symbol(children, Decl(contextuallyTypedJsxChildren2.tsx, 41, 40))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 42, 13))
>TSelected : Symbol(TSelected, Decl(contextuallyTypedJsxChildren2.tsx, 40, 26))

}) => React.ReactElement<any>
>React : Symbol(React, Decl(contextuallyTypedJsxChildren2.tsx, 4, 6))
>ReactElement : Symbol(React.ReactElement, Decl(react16.d.ts, 135, 9))

const _result = (
>_result : Symbol(_result, Decl(contextuallyTypedJsxChildren2.tsx, 45, 5))

<Subscribe
>Subscribe : Symbol(Subscribe, Decl(contextuallyTypedJsxChildren2.tsx, 40, 13))

selector={(state) => {
>selector : Symbol(selector, Decl(contextuallyTypedJsxChildren2.tsx, 46, 12))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 47, 15))

return [state.value]
>state.value : Symbol(State.value, Decl(contextuallyTypedJsxChildren2.tsx, 36, 17))
>state : Symbol(state, Decl(contextuallyTypedJsxChildren2.tsx, 47, 15))
>value : Symbol(State.value, Decl(contextuallyTypedJsxChildren2.tsx, 36, 17))

}}
>
{([value = false]) => {
>value : Symbol(value, Decl(contextuallyTypedJsxChildren2.tsx, 51, 7))

console.log(value)
>console.log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>console : Symbol(console, Decl(lib.dom.d.ts, --, --))
>log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>value : Symbol(value, Decl(contextuallyTypedJsxChildren2.tsx, 51, 7))

}}
</Subscribe>
>Subscribe : Symbol(Subscribe, Decl(contextuallyTypedJsxChildren2.tsx, 40, 13))

)

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