30 lines
1.9 KiB
TypeScript
30 lines
1.9 KiB
TypeScript
/// <reference path='fourslash.ts' />
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//@Filename: file.tsx
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// @jsx: preserve
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// @noLib: true
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//// declare function OverloadComponent<U>(attr: {b: U, a?: string, "ignore-prop": boolean}): JSX.Element;
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//// declare function OverloadComponent<T, U>(attr: {b: U, a: T}): JSX.Element;
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//// declare function OverloadComponent(): JSX.Element; // effective argument type of `{}`, needs to be last
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//// function Baz<T extends {b: number}, U extends {a: boolean, b:string}>(arg1: T, arg2: U) {
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//// let a0 = <Overloa/*1*/dComponent {...arg1} a="hello" ignore-prop />;
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//// let a1 = <Overloa/*2*/dComponent {...arg2} ignore-pro="hello world" />;
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//// let a2 = <Overloa/*3*/dComponent {...arg2} />;
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//// let a3 = <Overloa/*4*/dComponent {...arg1} ignore-prop />;
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//// let a4 = <Overloa/*5*/dComponent />;
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//// let a5 = <Overloa/*6*/dComponent {...arg2} ignore-prop="hello" {...arg1} />;
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//// let a6 = <Overloa/*7*/dComponent {...arg1} ignore-prop {...arg2} />;
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//// }
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verify.quickInfos({
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1: "function OverloadComponent<number>(attr: {\n b: number;\n a?: string;\n \"ignore-prop\": boolean;\n}): any (+2 overloads)",
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2: "function OverloadComponent<boolean, string>(attr: {\n b: string;\n a: boolean;\n}): any (+2 overloads)",
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3: "function OverloadComponent<boolean, string>(attr: {\n b: string;\n a: boolean;\n}): any (+2 overloads)",
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4: "function OverloadComponent(): any (+2 overloads)", // Subtype pass chooses this overload, since `a` is missing from the top overload, and `ignore-prop` is missing from the second (while T & {ignore-prop: true} is a proper subtype of `{}`)
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5: "function OverloadComponent(): any (+2 overloads)",
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6: "function OverloadComponent<boolean, never>(attr: {\n b: never;\n a: boolean;\n}): any (+2 overloads)",
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7: "function OverloadComponent<boolean, never>(attr: {\n b: never;\n a: boolean;\n}): any (+2 overloads)",
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});
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