utquidem/packages/toolkit/esmpack/src/constants.ts

The meta-framework suite designed from scratch for frontend-focused modern web development.

// [@\w] - Match a word-character or @ (valid package name)
// (?!.*(:\/\/)) - Ignore if previous match was a protocol (ex: http://)
export const BARE_SPECIFIER_REGEX = /^[@\w](?!.*(:\/\/))/;