Proposal: TypeScript rewrite (dual ESM+CJS, types, Bun) — maintained fork available

[fdciabdul]

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Opening this for discussion rather than as a giant PR, since it touches the whole tree.

I rewrote node-smpp in TypeScript while keeping the runtime API 100% backward
compatible, and published it as a maintained fork:
https://github.com/fdciabdul/node-smpp-next (npm i node-smpp-next).

What it includes

• TypeScript source with bundled .d.ts (addresses Types Support #180 "Types Support")
• Dual ESM + CommonJS build via tsup (import and require both work)
• Bun support (bun runtime + bun test)
• Node baseline raised to >=18; native Buffer (drops safer-buffer)
• Security: removed abandoned coveralls + nyc (43 transitive CVEs); 0 prod vulnerabilities
• findhit-proxywrap made an optional, lazily-loaded dependency so the core
  install carries no GPLv3 transitive dep (addresses Transitive dependency to GPLv3 package findhit-util #214)
• New features: session pool (Support for Session Pooling. #249), client auto-reconnect (Rebind on reconnecting to smsc is not working #248), per-request
  response timeout (define wait-ack #227), user-defined TLV round-trip (Support for user-defined TLVs #231)
• The three pure bug fixes (Crash when short_message misstype #229/Trying to debug message undefined error #256, message.decode() incorrect detects encoding #66/Client receiving empty message due to encoding conflict. #252, Support for user-defined TLVs #231) are also offered as a small
  JS-only PR here: Fix message encode crash, DCS-aware decode, and user-defined TLV round-trip #261

Question for the maintainer

Would you be open to upstreaming any of this — e.g. the TS migration, the type
defs, or the GPLv3-dependency removal? Happy to split it into reviewable PRs
(types-only, build-only, proxy-dep-only, etc.) if that is preferable to one large
change. If you would rather keep this repo as-is, the fork is available for users
who need these.

Thanks for the original library — it is the foundation for all of the above.
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