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20 lines
569 B
TypeScript
20 lines
569 B
TypeScript
export function insertInto<T>(arr: T[], index: number, elem: T): T[] {
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if (index >= arr.length) return [...arr, elem];
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if (index <= 0) return [elem, ...arr];
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return arr.flatMap((x, id) => {
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return id === index ? [elem, x] : x;
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});
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}
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// fs Promise functions return errors, but no stack trace. This adds back in
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// the stack trace.
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export function withTrace<Args extends unknown[], Result>(
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fn: (...x: Args) => Promise<Result>,
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...args: Args
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): Promise<Result> {
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return fn(...args).catch((reason: Error) => {
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throw Error(reason.message);
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});
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}
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