Deduplicate webhook deliveries

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Deduplicate webhook deliveries · UIHero

Deduplicate webhook deliveries

Keep the first delivery of each webhook event while preserving arrival order and caller-owned data.

EasyPayments Reliability

20 min0% acceptance

Description

Implement dedupeWebhookEvents for a webhook receiver that can be sent the same event more than once. Keep only the first event for each exact id, preserve the order of first delivery, and return fresh event objects without mutating the input.

Requirements

The solution exports a callable function named dedupeWebhookEvents.
Only the first event with each exact id is included in the result.
Retained events appear in the same relative order as their first deliveries.
Event ids are compared as case-sensitive strings.
An empty input array returns an empty array.
The function returns a new array containing new event objects.
The input array and its event objects are not mutated.

Retried delivery

Input

[{ id: 'evt_1' }, { id: 'evt_2' }, { id: 'evt_1' }]

Expected output

[{ id: 'evt_1' }, { id: 'evt_2' }]

Explanation

The second evt_1 delivery is ignored because its id has already been processed.

Constraints

Every event has a non-empty string id
The input may contain up to 10000 events
Keep the first payload when duplicate ids contain different data
Do not mutate the input array or its event objects

Hints

Hint 1

Track exact identifiers as you scan once, and decide which encounter is allowed to populate the output.

Hint 2

Treat identifier casing as meaningful rather than normalizing it for comparison.

Hint 3

Create the accepted output objects independently so input records cannot be changed through the result.

arrayssetsidempotencywebhooks

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