[jeonghoon11]

Summary

Fixes #2068

Fixes the once function to preserve the this context of the wrapped function, matching Lodash's behavior.

Changes

The following case returns 42 in Lodash, while es-toolkit/compat returned undefined before this change because the wrapped function lost its this context.

import { once } from 'es-toolkit/compat';

const object = {
  value: 42,
  getValue: once(function () {
    return this?.value;
  }),
};

object.getValue();

// Lodash: 42
// es-toolkit/compat before this change: undefined

• Updated the shared once implementation to forward the wrapper's this context to the original function using func.apply(this, args).
• Added regression tests for both es-toolkit and es-toolkit/compat.

Since es-toolkit/compat reuses the main once implementation, both es-toolkit and es-toolkit/compat now return 42.

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Project	Deployment	Actions	Updated (UTC)
es-toolkit	Ready	Preview	Aug 28, 2026 8:18am