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npm · #68 most downloaded on npm
A robust, ES3 compatible, "has own property" predicate.
Last release 4 months ago
28 May 2026
Ships unpredictably
gaps range from 4 weeks to 9.1 years
Nearly every release is documented
notes for 6 of 6 stable releases
Nothing withdrawn
no release was ever pulled
12 years old
6 releases · first in 2014
[types] drop the dead key-narrowing overload `fdab00e`
[actions] update workflows `fb837b8`
fb837b8@arethetypeswrong/cli, @ljharb/eslint-config, @ljharb/tsconfig, @types/tape, auto-changelog, eslint, mock-property, npmignore, tape f4b279beslint, @ljharb/eslint-config; migrate to flat config 7e415ceeslint ef313danpm audit instead of aud d5c6d4dcc03a09One column per quarter.
[types] use shared config `68e9d4d`
[types] use a handwritten d.ts file; fix exported type `012b989`
revamped implementation, tests, readme `72bf8b3`
### Commits - Initial commit `8dbfde6`
8dbfde6Your coding agent can read these notes before it upgrades. Set up the MCP server →