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[Wip] Fix 11566 : allow null return in SFC #14045

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[Wip] Fix 11566 : allow null return in SFC #14045

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70e0c36
Allow stateless function component to return null
Feb 11, 2017
6b120f3
Update baselines
Feb 13, 2017
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13 changes: 8 additions & 5 deletions src/compiler/checker.ts
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Expand Up @@ -346,6 +346,7 @@ namespace ts {
});

let jsxElementType: Type;
let jsxStatelessElementType: Type;
let _jsxNamespace: string;
let _jsxFactoryEntity: EntityName;

Expand All @@ -358,7 +359,8 @@ namespace ts {
ElementAttributesPropertyNameContainer: "ElementAttributesProperty",
Element: "Element",
IntrinsicAttributes: "IntrinsicAttributes",
IntrinsicClassAttributes: "IntrinsicClassAttributes"
IntrinsicClassAttributes: "IntrinsicClassAttributes",
StatelessElement: "StatelessElement"
};

const subtypeRelation = createMap<RelationComparisonResult>();
Expand Down Expand Up @@ -12197,13 +12199,13 @@ namespace ts {
function defaultTryGetJsxStatelessFunctionAttributesType(openingLikeElement: JsxOpeningLikeElement, elementType: Type, elemInstanceType: Type, elementClassType?: Type): Type {
Debug.assert(!(elementType.flags & TypeFlags.Union));
if (!elementClassType || !isTypeAssignableTo(elemInstanceType, elementClassType)) {
if (jsxElementType) {
if (jsxStatelessElementType) {
// We don't call getResolvedSignature here because we have already resolve the type of JSX Element.
const callSignature = getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, /*candidatesOutArray*/ undefined);
if (callSignature !== unknownSignature) {
const callReturnType = callSignature && getReturnTypeOfSignature(callSignature);
let paramType = callReturnType && (callSignature.parameters.length === 0 ? emptyObjectType : getTypeOfSymbol(callSignature.parameters[0]));
if (callReturnType && isTypeAssignableTo(callReturnType, jsxElementType)) {
if (callReturnType && isTypeAssignableTo(callReturnType, jsxStatelessElementType)) {
// Intersect in JSX.IntrinsicAttributes if it exists
const intrinsicAttributes = getJsxType(JsxNames.IntrinsicAttributes);
if (intrinsicAttributes !== unknownType) {
Expand Down Expand Up @@ -12231,7 +12233,7 @@ namespace ts {
Debug.assert(!(elementType.flags & TypeFlags.Union));
if (!elementClassType || !isTypeAssignableTo(elemInstanceType, elementClassType)) {
// Is this is a stateless function component? See if its single signature's return type is assignable to the JSX Element Type
if (jsxElementType) {
if (jsxStatelessElementType) {
// We don't call getResolvedSignature because here we have already resolve the type of JSX Element.
const candidatesOutArray: Signature[] = [];
getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, candidatesOutArray);
Expand All @@ -12240,7 +12242,7 @@ namespace ts {
for (const candidate of candidatesOutArray) {
const callReturnType = getReturnTypeOfSignature(candidate);
const paramType = callReturnType && (candidate.parameters.length === 0 ? emptyObjectType : getTypeOfSymbol(candidate.parameters[0]));
if (callReturnType && isTypeAssignableTo(callReturnType, jsxElementType)) {
if (callReturnType && isTypeAssignableTo(callReturnType, jsxStatelessElementType)) {
let shouldBeCandidate = true;
for (const attribute of openingLikeElement.attributes.properties) {
if (isJsxAttribute(attribute) &&
Expand Down Expand Up @@ -21280,6 +21282,7 @@ namespace ts {
globalRegExpType = getGlobalType("RegExp");

jsxElementType = getExportedTypeFromNamespace("JSX", JsxNames.Element);
jsxStatelessElementType = getExportedTypeFromNamespace("JSX", JsxNames.StatelessElement)
getGlobalClassDecoratorType = memoize(() => getGlobalType("ClassDecorator"));
getGlobalPropertyDecoratorType = memoize(() => getGlobalType("PropertyDecorator"));
getGlobalMethodDecoratorType = memoize(() => getGlobalType("MethodDecorator"));
Expand Down
5 changes: 3 additions & 2 deletions tests/baselines/reference/contextuallyTypedStringLiteralsInJsxAttributes01.errors.txt
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@@ -1,14 +1,15 @@
tests/cases/conformance/types/contextualTypes/jsxAttributes/contextuallyTypedStringLiteralsInJsxAttributes01.tsx(16,15): error TS2322: Type '{ foo: "f"; }' is not assignable to type '{ foo: "A" | "B" | "C"; }'.
tests/cases/conformance/types/contextualTypes/jsxAttributes/contextuallyTypedStringLiteralsInJsxAttributes01.tsx(17,15): error TS2322: Type '{ foo: "f"; }' is not assignable to type '{ foo: "A" | "B" | "C"; }'.
Types of property 'foo' are incompatible.
Type '"f"' is not assignable to type '"A" | "B" | "C"'.
tests/cases/conformance/types/contextualTypes/jsxAttributes/contextuallyTypedStringLiteralsInJsxAttributes01.tsx(17,15): error TS2322: Type '{ foo: "f"; }' is not assignable to type '{ foo: "A" | "B" | "C"; }'.
tests/cases/conformance/types/contextualTypes/jsxAttributes/contextuallyTypedStringLiteralsInJsxAttributes01.tsx(18,15): error TS2322: Type '{ foo: "f"; }' is not assignable to type '{ foo: "A" | "B" | "C"; }'.
Types of property 'foo' are incompatible.
Type '"f"' is not assignable to type '"A" | "B" | "C"'.


==== tests/cases/conformance/types/contextualTypes/jsxAttributes/contextuallyTypedStringLiteralsInJsxAttributes01.tsx (2 errors) ====

namespace JSX {
export type StatelessElement = JSX.Element | null;
export interface IntrinsicElements {
span: {};
}
Expand Down
2 changes: 2 additions & 0 deletions tests/baselines/reference/contextuallyTypedStringLiteralsInJsxAttributes01.js
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@@ -1,6 +1,7 @@
//// [contextuallyTypedStringLiteralsInJsxAttributes01.tsx]

namespace JSX {
export type StatelessElement = JSX.Element | null;
export interface IntrinsicElements {
span: {};
}
Expand All @@ -27,6 +28,7 @@ var FooComponent = function (props) { return <span>{props.foo}</span>; };

//// [contextuallyTypedStringLiteralsInJsxAttributes01.d.ts]
declare namespace JSX {
type StatelessElement = JSX.Element | null;
interface IntrinsicElements {
span: {};
}
Expand Down
1 change: 1 addition & 0 deletions tests/baselines/reference/tsxAttributeResolution14.errors.txt
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Expand Up @@ -9,6 +9,7 @@ tests/cases/conformance/jsx/file.tsx(16,28): error TS2322: Type '{ justRandomPro
==== tests/cases/conformance/jsx/react.d.ts (0 errors) ====

declare module JSX {
type StatelessElement = JSX.Element | null;
interface Element { }
interface IntrinsicElements {
div: any;
Expand Down
1 change: 1 addition & 0 deletions tests/baselines/reference/tsxAttributeResolution14.js
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Expand Up @@ -3,6 +3,7 @@
//// [react.d.ts]

declare module JSX {
type StatelessElement = JSX.Element | null;
interface Element { }
interface IntrinsicElements {
div: any;
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxDefaultAttributesResolution1.symbols
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Expand Up @@ -20,8 +20,8 @@ class Poisoned extends React.Component<Prop, {}> {
>render : Symbol(Poisoned.render, Decl(file.tsx, 6, 50))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxDefaultAttributesResolution2.symbols
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Expand Up @@ -20,8 +20,8 @@ class Poisoned extends React.Component<Prop, {}> {
>render : Symbol(Poisoned.render, Decl(file.tsx, 6, 50))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxSpreadAttributesResolution1.symbols
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Expand Up @@ -13,8 +13,8 @@ class Poisoned extends React.Component<{}, {}> {
>render : Symbol(Poisoned.render, Decl(file.tsx, 3, 48))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxSpreadAttributesResolution11.symbols
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Expand Up @@ -49,8 +49,8 @@ class OverWriteAttr extends React.Component<Prop, {}> {
>render : Symbol(OverWriteAttr.render, Decl(file.tsx, 18, 55))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxSpreadAttributesResolution3.symbols
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Expand Up @@ -24,8 +24,8 @@ class Poisoned extends React.Component<PoisonedProp, {}> {
>render : Symbol(Poisoned.render, Decl(file.tsx, 8, 58))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
8 changes: 4 additions & 4 deletions tests/baselines/reference/tsxSpreadAttributesResolution4.symbols
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Expand Up @@ -24,8 +24,8 @@ class Poisoned extends React.Component<PoisonedProp, {}> {
>render : Symbol(Poisoned.render, Decl(file.tsx, 8, 58))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down Expand Up @@ -57,8 +57,8 @@ class EmptyProp extends React.Component<{}, {}> {
>render : Symbol(EmptyProp.render, Decl(file.tsx, 22, 49))

return <div>Default hi</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxSpreadAttributesResolution8.symbols
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Expand Up @@ -46,8 +46,8 @@ class OverWriteAttr extends React.Component<Prop, {}> {
>render : Symbol(OverWriteAttr.render, Decl(file.tsx, 18, 55))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxSpreadAttributesResolution9.symbols
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Expand Up @@ -24,8 +24,8 @@ class Opt extends React.Component<OptionProp, {}> {
>render : Symbol(Opt.render, Decl(file.tsx, 8, 51))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}
}

Expand Down
14 changes: 7 additions & 7 deletions tests/baselines/reference/tsxStatelessFunctionComponents3.symbols
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Expand Up @@ -6,7 +6,7 @@ import React = require('react');
const Foo = (props: any) => <div/>;
>Foo : Symbol(Foo, Decl(file.tsx, 3, 5))
>props : Symbol(props, Decl(file.tsx, 3, 13))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))

// Should be OK
const foo = <Foo />;
Expand All @@ -20,14 +20,14 @@ var MainMenu: React.StatelessComponent<{}> = (props) => (<div>
>React : Symbol(React, Decl(file.tsx, 0, 0))
>StatelessComponent : Symbol(React.StatelessComponent, Decl(react.d.ts, 197, 40))
>props : Symbol(props, Decl(file.tsx, 9, 46))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))

<h3>Main Menu</h3>
>h3 : Symbol(JSX.IntrinsicElements.h3, Decl(react.d.ts, 2409, 48))
>h3 : Symbol(JSX.IntrinsicElements.h3, Decl(react.d.ts, 2409, 48))
>h3 : Symbol(JSX.IntrinsicElements.h3, Decl(react.d.ts, 2412, 48))
>h3 : Symbol(JSX.IntrinsicElements.h3, Decl(react.d.ts, 2412, 48))

</div>);
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))

var App: React.StatelessComponent<{ children }> = ({children}) => (
>App : Symbol(App, Decl(file.tsx, 13, 3))
Expand All @@ -37,12 +37,12 @@ var App: React.StatelessComponent<{ children }> = ({children}) => (
>children : Symbol(children, Decl(file.tsx, 13, 52))

<div >
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))

<MainMenu/>
>MainMenu : Symbol(MainMenu, Decl(file.tsx, 9, 3))

</div>
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))

);
8 changes: 4 additions & 4 deletions tests/baselines/reference/tsxUnionElementType1.symbols
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Expand Up @@ -9,8 +9,8 @@ function SFC1(prop: { x: number }) {
>x : Symbol(x, Decl(file.tsx, 3, 21))

return <div>hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))

};

Expand All @@ -20,8 +20,8 @@ function SFC2(prop: { x: boolean }) {
>x : Symbol(x, Decl(file.tsx, 7, 21))

return <h1>World </h1>;
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2407, 47))
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2407, 47))
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2410, 47))
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2410, 47))
}

var SFCComp = SFC1 || SFC2;
Expand Down
12 changes: 6 additions & 6 deletions tests/baselines/reference/tsxUnionElementType5.symbols
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Expand Up @@ -7,16 +7,16 @@ function EmptySFC1() {
>EmptySFC1 : Symbol(EmptySFC1, Decl(file.tsx, 1, 32))

return <div>hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}

function EmptySFC2() {
>EmptySFC2 : Symbol(EmptySFC2, Decl(file.tsx, 5, 1))

return <div>Hello</div>;
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2397, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
>div : Symbol(JSX.IntrinsicElements.div, Decl(react.d.ts, 2400, 45))
}

function SFC2(prop: { x: boolean }) {
Expand All @@ -25,8 +25,8 @@ function SFC2(prop: { x: boolean }) {
>x : Symbol(x, Decl(file.tsx, 11, 21))

return <h1>World</h1>;
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2407, 47))
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2407, 47))
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2410, 47))
>h1 : Symbol(JSX.IntrinsicElements.h1, Decl(react.d.ts, 2410, 47))
}

var EmptySFCComp = EmptySFC1 || EmptySFC2;
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/tsxUnionTypeComponent1.symbols
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Expand Up @@ -39,8 +39,8 @@ class MyComponent extends React.Component<ComponentProps, {}> {
<MyComponent AnyComponent={() => <button>test</button>}/>
>MyComponent : Symbol(MyComponent, Decl(file.tsx, 5, 1))
>AnyComponent : Symbol(AnyComponent, Decl(file.tsx, 15, 12))
>button : Symbol(JSX.IntrinsicElements.button, Decl(react.d.ts, 2383, 43))
>button : Symbol(JSX.IntrinsicElements.button, Decl(react.d.ts, 2383, 43))
>button : Symbol(JSX.IntrinsicElements.button, Decl(react.d.ts, 2386, 43))
>button : Symbol(JSX.IntrinsicElements.button, Decl(react.d.ts, 2386, 43))

// Component Class as Props
class MyButtonComponent extends React.Component<{},{}> {
Expand Down
1 change: 1 addition & 0 deletions tests/cases/conformance/jsx/tsxAttributeResolution14.tsx
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Expand Up @@ -3,6 +3,7 @@

//@filename: react.d.ts
declare module JSX {
type StatelessElement = JSX.Element | null;
interface Element { }
interface IntrinsicElements {
div: any;
Expand Down
1 change: 1 addition & 0 deletions .../types/contextualTypes/jsxAttributes/contextuallyTypedStringLiteralsInJsxAttributes01.tsx
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Expand Up @@ -2,6 +2,7 @@
// @declaration: true

namespace JSX {
export type StatelessElement = JSX.Element | null;
export interface IntrinsicElements {
span: {};
}
Expand Down
1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxCompletion12.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
Expand Down
1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxCompletion13.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
Expand Down
1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxCompletionUnionElementType.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
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1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxFindAllReferences10.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
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1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxFindAllReferences7.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
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1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxFindAllReferences9.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
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1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxGoToDefinitionStatelessFunction1.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
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1 change: 1 addition & 0 deletions tests/cases/fourslash/tsxRename10.ts
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Expand Up @@ -5,6 +5,7 @@
// @noLib: true

//// declare module JSX {
//// type StatelessElement = JSX.Element | null;
//// interface Element { }
//// interface IntrinsicElements {
//// }
Expand Down
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