35 lines
1.3 KiB
TypeScript
35 lines
1.3 KiB
TypeScript
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/**
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* Aggregate Promise.allSettled results into a single Error that names every
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* failed endpoint, or return null when all fulfilled. Used at TUI bootstrap
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* boundaries so a single 4xx doesn't drown its parallel siblings as
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* unhandled rejections — every failure surfaces in one labeled message.
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*/
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export type LabeledSettled = {
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name: string
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result: PromiseSettledResult<unknown>
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}
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export function aggregateFailures(labeled: LabeledSettled[]): Error | null {
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const failed = labeled.filter(
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(x): x is { name: string; result: PromiseRejectedResult } => x.result.status === "rejected",
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)
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if (failed.length === 0) return null
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const reasons = failed.map((f) => `${f.name}: ${reasonMessage(f.result.reason)}`).join("; ")
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const summary = `${failed.length} of ${labeled.length} requests failed: ${reasons}`
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const err = new Error(summary)
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err.cause = { failures: failed.map((f) => ({ name: f.name, reason: f.result.reason })) }
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return err
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}
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function reasonMessage(reason: unknown): string {
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if (reason instanceof Error) return reason.message
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if (typeof reason === "string") return reason
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if (reason && typeof reason === "object") {
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const obj = reason as { message?: unknown; name?: unknown }
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if (typeof obj.message === "string") return obj.message
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if (typeof obj.name === "string") return obj.name
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}
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return String(reason)
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}
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