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rewrite bindPredicateOr to have arbitrary arity

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Signed-off-by: Sebastian Malton <sebastian@malton.name>
This commit is contained in:
Sebastian Malton 2021-02-19 19:57:06 -05:00
parent 04c36b4b5b
commit 2fd41ad17d
2 changed files with 9 additions and 16 deletions
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4
src/common/ipc/update-available.ipc.ts
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@ -32,8 +32,8 @@ function isUpdateInfo(src: unknown): src is UpdateInfo {
&& hasTypedProperty(src, "releaseDate", isString) && hasTypedProperty(src, "releaseDate", isString)
&& hasTypedProperty(src, "files", bindPredicate(isTypedArray, isUpdateFileInfo)) && hasTypedProperty(src, "files", bindPredicate(isTypedArray, isUpdateFileInfo))
&& hasOptionalProperty(src, "releaseName", bindPredicateOr(isString, isNull)) && hasOptionalProperty(src, "releaseName", bindPredicateOr(isString, isNull))
&& hasOptionalProperty(src, "stagingPercentage", isNumber) && hasOptionalProperty(src, "releaseNotes", bindPredicateOr(isString, isReleaseNoteInfo, isNull))
&& hasOptionalProperty(src, "releaseNotes", bindPredicateOr(isString, isReleaseNoteInfo, isNull)); && hasOptionalProperty(src, "stagingPercentage", isNumber);
} }
export function isUpdateAvailableArgs(args: unknown[]): args is UpdateAvailableArgs { export function isUpdateAvailableArgs(args: unknown[]): args is UpdateAvailableArgs {

21
src/common/utils/type-narrowing.ts
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@ -113,20 +113,13 @@ export function bindPredicate<FnArgs extends any[], T>(fn: (arg1: unknown, ...ar
} }
type Predicate<T> = (arg: unknown) => arg is T; type Predicate<T> = (arg: unknown) => arg is T;
type Rest<T extends any[]> = T extends [any, ...infer R] ? R : any;
type First<T extends any[]> = T extends [infer R, ...any[]] ? R : any;
type ReturnPredicateType<T extends (src: unknown) => src is any> = T extends (src: unknown) => src is infer R ? R : any;
type OrReturnPredicateType<T extends Predicate<any>[]> = ReturnPredicateType<First<T>> | (T extends [any] ? never : OrReturnPredicateType<Rest<T>>);
export function bindPredicateOr<T1>(p1: Predicate<T1>): Predicate<T1>; export function bindPredicateOr<Predicates extends Predicate<any>[]>(...predicates: Predicates): Predicate<OrReturnPredicateType<Predicates>> {
export function bindPredicateOr<T1, T2>(p1: Predicate<T1>, p2: Predicate<T2>): Predicate<T1 | T2>; return (arg: unknown): arg is OrReturnPredicateType<Predicates> => {
export function bindPredicateOr<T1, T2, T3>(p1: Predicate<T1>, p2: Predicate<T2>, p3: Predicate<T3>): Predicate<T1 | T2 | T3>; return predicates.some(predicate => predicate(arg));
export function bindPredicateOr<T1, T2, T3, T4>(p1: Predicate<T1>, p2: Predicate<T2>, p3: Predicate<T3>, p4: Predicate<T4>): Predicate<T1 | T2 | T3 | T4>;
export function bindPredicateOr<T extends any[]>(...predicates: T): Predicate<T> {
return (arg: unknown): arg is any => {
for (const predicate of predicates) {
if (predicate) {
return true;
}
}
return false;
}; };
} }