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52 lines
2.3 KiB
TypeScript
52 lines
2.3 KiB
TypeScript
// Copyright (c) 2022, Compiler Explorer Authors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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export type PropertyValue = string | boolean | number | undefined;
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// names don't matter
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interface TypeMap {
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a: string;
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b: boolean;
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c: number;
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d: undefined;
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}
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export type Widen<T> = T extends T
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? {
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[P in keyof TypeMap]: T extends TypeMap[P] ? TypeMap[P] : never;
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}[keyof TypeMap]
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: T;
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// TODO(jeremy-rifkin): I think the types could use some work here.
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// Maybe props<string>(property) should be string | undefined.
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function superficialGetter(property: string, defaultValue?: undefined): PropertyValue;
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function superficialGetter<T extends PropertyValue>(property: string, defaultValue: Widen<T>): typeof defaultValue;
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function superficialGetter<T extends PropertyValue>(property: string, defaultValue?: unknown): T;
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function superficialGetter(property: string, defaultValue?: unknown): unknown {
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return;
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}
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export type PropertyGetter = typeof superficialGetter;
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