54 lines
2.5 KiB
Plaintext
54 lines
2.5 KiB
Plaintext
tests/cases/compiler/intersectionsAndOptionalProperties.ts(5,1): error TS2322: Type '{ a: null; b: string; }' is not assignable to type '{ a?: number | undefined; b: string; }'.
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Types of property 'a' are incompatible.
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Type 'null' is not assignable to type 'number | undefined'.
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tests/cases/compiler/intersectionsAndOptionalProperties.ts(6,1): error TS2322: Type '{ a: null; } & { b: string; }' is not assignable to type '{ a?: number | undefined; b: string; }'.
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Types of property 'a' are incompatible.
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Type 'null' is not assignable to type 'number | undefined'.
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tests/cases/compiler/intersectionsAndOptionalProperties.ts(19,5): error TS2322: Type 'From' is not assignable to type 'To'.
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Types of property 'field' are incompatible.
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Type 'null' is not assignable to type 'number | undefined'.
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tests/cases/compiler/intersectionsAndOptionalProperties.ts(20,5): error TS2322: Type 'null' is not assignable to type 'number | undefined'.
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==== tests/cases/compiler/intersectionsAndOptionalProperties.ts (4 errors) ====
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declare let x: { a?: number, b: string };
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declare let y: { a: null, b: string };
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declare let z: { a: null } & { b: string };
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x = y; // Error
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~
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!!! error TS2322: Type '{ a: null; b: string; }' is not assignable to type '{ a?: number | undefined; b: string; }'.
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!!! error TS2322: Types of property 'a' are incompatible.
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!!! error TS2322: Type 'null' is not assignable to type 'number | undefined'.
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x = z; // Error
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~
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!!! error TS2322: Type '{ a: null; } & { b: string; }' is not assignable to type '{ a?: number | undefined; b: string; }'.
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!!! error TS2322: Types of property 'a' are incompatible.
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!!! error TS2322: Type 'null' is not assignable to type 'number | undefined'.
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// Repro from #36604
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interface To {
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field?: number;
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anotherField: string;
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}
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type From = { field: null } & Omit<To, 'field'>;
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function foo(v: From) {
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let x: To;
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x = v; // Error
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~
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!!! error TS2322: Type 'From' is not assignable to type 'To'.
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!!! error TS2322: Types of property 'field' are incompatible.
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!!! error TS2322: Type 'null' is not assignable to type 'number | undefined'.
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x.field = v.field; // Error
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~~~~~~~
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!!! error TS2322: Type 'null' is not assignable to type 'number | undefined'.
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}
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// Repro from #38348
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const yy: number[] & [number, ...number[]] = [1];
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const xx: [number, ...number[]] = yy;
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