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19 lines
1.0 KiB
TypeScript
19 lines
1.0 KiB
TypeScript
import {expectNotAssignable, expectType} from 'tsd';
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import type {SetReadonly} from '../index';
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// Update one readonly and one non readonly to readonly.
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declare const variation1: SetReadonly<{a: number; readonly b: string; c: boolean}, 'b' | 'c'>;
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expectType<{a: number; readonly b: string; readonly c: boolean}>(variation1);
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// Update two non readonly to readonly.
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declare const variation2: SetReadonly<{readonly a: number; readonly b: string; c: boolean}, 'a' | 'b'>;
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expectType<{readonly a: number; readonly b: string; c: boolean}>(variation2);
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// Three readonly remain readonly.
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declare const variation3: SetReadonly<{readonly a: number; readonly b?: string; readonly c: boolean}, 'a' | 'b' | 'c'>;
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expectType<{readonly a: number; readonly b?: string; readonly c: boolean}>(variation3);
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// Fail if type changes even if readonly is right.
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declare const variation4: SetReadonly<{a: number; readonly b: string; c: boolean}, 'b' | 'c'>;
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expectNotAssignable<{a: boolean; readonly b: string; readonly c: boolean}>(variation4);
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