What problem does it solve? Adopting a Temporal-first date handling policy requires banning Date and legacy date libraries across a codebase, but wiring a new ESLint plugin into an existing flat config without breaking current lint rules is error-prone. This Skill guides the installation, configuration, and verification of @northguild/gmt-eslint so Date-ban rules are active with minimal config churn. ## Core Features & Use Cases - Dependency installation: Installs @northguild/gmt-eslint, eslint, and required parser dependencies. - Flat config wiring: Merges the gmt-eslint config into eslint.config.mjs while preserving existing project rules. - Enforcement verification: Runs ESLint to confirm Date API bans and restricted imports of moment, dayjs, luxon, date-fns, and similar libraries are reported. - Use Case: A team migrating to the TC39 Temporal standard uses this Skill to add gmt-eslint to their repo, verify new Date() is flagged, and stage import bans gradually in a codebase still using date-fns. ## Quick Start Set up @northguild/gmt-eslint in my project's ESLint flat config and verify that Date usage is banned.
