Hi! I've written a full TypeScript rewrite of zxcvbn called zxcvbn-ts in case anyone is looking for a type-safe alternative.

It includes:

• Strict TypeScript with a discriminated-union Match type for exhaustive pattern narrowing
• Dual CJS/ESM output
• All 93,855 dictionary words bundled
• Optional AI-powered feedback via zxcvbnAI() — returns a plain-English explanation of exactly why a password is weak, powered by Claude (bring your own API key)
• A few bug fixes over the original (notably a lazy-init bug that silently disabled all dictionary matching when setUserInputDictionary was called first)

Available on npm: bun add zxcvbn-ts / npm install zxcvbn-ts

Happy to take feedback or PRs.