Add yasuo.js (TypeScript & JavaScript) — modern, zero-dependency Riot Games API client - #224

Add yasuo.js — a modern, zero-dependency Riot Games API client for TypeScript

This PR adds the library to both the TypeScript and JavaScript lists — libraries/typescript/yasuojs.json and libraries/javascript/yasuojs.json. yasuo.js is written in TypeScript but ships a compiled JS + .d.ts build, so it's equally usable from plain JavaScript — same dual-listing pattern as twisted. No existing files are touched.

yasuo.js is the spiritual successor to twisted — same one-client, typed-response ergonomics, rebuilt around a query-builder API with zero runtime dependencies.

Links

Why it belongs here

• Zero runtime dependencies — nothing pulled into your node_modules (verify: npm view yasuo.js dependencies → empty). Just fully-typed TypeScript.
• First-class TypeScript — regions, queues, tiers, divisions and match types are enums (no magic strings); errors are typed ApiError subclasses you narrow with instanceof.
• Query builders + lazy relations — account.summoner(region).matchIds().execute() runs only the final request; relations auto-route (e.g. Region.KR → RegionGroup.ASIA) so you never re-specify routing.
• Rate limiting done right — reactive retry-after backoff is always on; opt-in proactive pacing reads Riot's x-app/x-method rate-limit headers and stays under the advertised limits, per host and per method.
• Pluggable caching — in-memory by default; Redis or Cloudflare Workers KV with no extra dependency.
• Async-iterator pagination — for await over a player's entire match history, paced by the limiter.
• Custom transport + axios-style middleware, a leveled logger, and a single-file dual ESM + CJS build (Node 18+ / Bun / Deno).
• 51 endpoints across LoL (33), TFT (14) and the Riot Account API (4), plus Data Dragon static data.

Live proof it works

www.yasuo.gg is a complete, open-source League of Legends summoner-profile site + public JSON API, built entirely on this library and running on Cloudflare Workers (source). It even ships an interactive playground that shows the exact yasuo.js code behind each lookup.

Entry checklist

• Files follow the naming rule (repo lowercased, non-alphanumeric stripped) → yasuojs.json, added under both libraries/typescript/ and libraries/javascript/
• No filename collision in either folder
• Validates against schema.json (additionalProperties: false satisfied)
• Includes the v4 tag (also v5) so it surfaces in the docs + #lol-dev
• rate-limiting tag — the library natively handles rate limiting
• tft tag — full TFT API support