Frontend dev ships first npm package 'daterly' using AI, now live in production

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A frontend developer with three years of experience has published his first npm package, a React date picker called 'daterly', which is already deployed in internal projects at his company, Sima-Land. The package was built primarily using Claude Code and related AI tools, addressing recurring friction with an existing date picker that clashed with the team's react-hook-form workflow and design system. Daterly is built on react-day-picker v9 and date-fns v4, offering features like masked text input, locale and format customisation, optional time selection, and a separate RHF integration entry point to avoid unnecessary overhead. The developer notes that AI assistance was most effective for complex, self-contained algorithms, such as building a custom digit-only input mask with precise cursor restoration logic. The project was motivated not by a desire for npm downloads but by the need for a date picker that fits the team's consistent, shared tech stack, particularly for Russian-market requirements.

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