[poketopa]

Summary

During lazy evaluation, fp/intersectionBy keeps multiple values with the same mapped key, unlike its eager path.

import { intersectionBy, pipe, take } from 'es-toolkit/fp';

pipe([2.1, 2.2], intersectionBy([2.3, 3.4], Math.floor), take(2));
// Before: [2.1, 2.2]
// After:  [2.1]

Changes

• Create a separate set of unmatched keys for each lazy run and remove each key after its first match.
• Add regression tests for duplicate matches and reuse of the same operator.
• Update the bundle size snapshot and changelog.

[vercel]

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Project	Deployment	Actions	Updated
es-toolkit	Ready	Preview	Oct 22, 2026 1:09am UTC