36 lines
995 B
TypeScript
36 lines
995 B
TypeScript
// Repro from #14896
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type Attributes<Keys extends string> = {
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[Key in Keys]: string;
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}
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class Query<A extends Attributes<keyof A>> {
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multiply<B extends Attributes<keyof B>>(x: B): Query<A & B>;
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}
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// Repro from #14940
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type ClassName<S> = keyof S;
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type ClassNameMap<S> = { [K in keyof S]?: boolean }
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type ClassNameObjectMap<S> = object & ClassNameMap<S>;
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type ClassNameArg<S> = ClassName<S> | ClassNameObjectMap<S>;
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export function css<S extends { [K in keyof S]: string }>(styles: S, ...classNames: ClassNameArg<S>[]): string {
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const args = classNames.map(arg => {
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if (arg == null) {
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return null;
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}
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if (typeof arg == "string") {
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return styles[arg];
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}
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if (typeof arg == "object") {
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return Object.keys(arg).reduce<ClassNameObject>((obj: ClassNameObject, key: keyof S) => {
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const exportedClassName = styles[key];
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obj[exportedClassName] = (arg as ClassNameMap<S>)[key];
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return obj;
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}, {});
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}
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});
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return "";
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}
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