is-extendable is a JavaScript utility that returns whether a value is one of the types that can be extended (array, plain object, or function). It is useful for safely deciding if a value should support key-based extension.
Project status
- The repository appears quiet or in maintenance mode, with the last upstream push on 2021-08-20 and the most recent listed version update dating to 2017-09-11, so there is no evidence of active ongoing development as of 2026-06-09.
- The update cadence is sporadic and long gaps are evident, with releases in 2015, then 2017 (0.1.0 to 1.0.0), and another update in 2017, and then no further updates after 2017.
AI summary generated
Recent updates
1.0.1
Release 1.0.1 does not include any publisher-provided release notes. The code diff shows this version primarily adds TypeScript type definitions and updates package metadata to ship them.
1.0.0
No publisher release notes were provided for version 1.0.0 (the <release_notes> section is empty). The code diff shows a major behavioral change to is-extendable, plus various repo/tooling updates (linting, CI matrix, and documentation generation).
0.1.1
Release 0.1.1 was published, but no release notes were provided by the publisher. There is no documented information about new features, bug fixes, security updates, or breaking changes in the supplied data.
0.1.0
Release 0.1.0 was published on 2015-06-29, but no release notes were provided by the publisher. As a result, there is no documented information about new features, bug fixes, breaking changes, security updates, or migration steps for this version.