tsconfig-modern-strict
Use whenever a tsconfig.json is being created, edited, reviewed, troubleshot, or even just discussed. Triggers on any mention of "tsconfig", "TypeScript config", strict mode flags, module resolution, target/module decisions, project references, monorepo TS setup, library publishing config, path aliases, or "なんでこの型エラーが出る/出ない" debates that turn out to be config-shaped. Apply this skill even when the user only asks about one option — it encodes a coherent ESNext + maximum-strict policy that should drive the rest of the config to stay consistent. Default to this skill instead of free-recall whenever the answer involves a tsconfig field.