René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Low][core] debounce({leading,trailing}) double-invokes on a single call","articleBody":"## Severity: 🟢 Low (correctness)\n\n## Location\n[`src/core/utils/function.ts:99-118`](../blob/main/src/core/utils/function.ts#L99-L118) (`debounce`).\n\n## Description\nWith `{ leading: true, trailing: true }`, a **single** call double-invokes: the leading branch invokes immediately with `preservePending = trailing` (keeping `pendingArgs`), then `trailingTrigger` fires and, seeing `pendingArgs` still set, invokes **again**. So one call yields two invocations. Lodash semantics fire the trailing edge only when the function was called more than once during the wait window.\n\n## Reproduction\n```ts\nconst fn = debounce(spy, 50, { leading: true, trailing: true });\nfn('a');                 // leading fires immediately\n// after 50ms: trailing fires again with 'a'  → spy called twice for one call\n```\n\n## Suggested fix\nTrack whether a subsequent call occurred after the leading invoke; only run the trailing edge if so (clear `pendingArgs` after a leading-only single call).\n\n---\n_Filed as part of a full-codebase security \u0026 correctness audit._\n","author":{"url":"https://github.com/JosunLP","@type":"Person","name":"JosunLP"},"datePublished":"2026-07-05T17:03:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/178/bQuery/issues/178"}