Rslib Modern Package Use this skill when creating a new Rslib library, modernizing an existing JS/TS package, or reviewing a package against an opinionated modern library standard. This skill is opinionated: it describes a recommended modern package contract and may suggest breaking changes when they make the package simpler, safer, and easier for modern consumers. Standard Default recommendation for new JS/TS libraries: - ESM-first, preferably pure ESM. - Strict TypeScript and correct declaration files. - Explicit public API through . - Small named-export API surface. - Few runtime dependenc…