BREAKING CHANGE: Node.js 22.12.0 or newer is now required.

Removes the legacy esm package fallback and loads compiled ESM transformer output through native Node require(esm). Forced-ESM .cts transformer entries are now rejected with a clear error pointing to .mts or removing isEsm.

Re-enables ESM transformer coverage and removes stale missing-esm fixture scaffolding. Includes a small TsInstance typing fix so the patch self-build sees the originalCreateProgram augmentation under the TS 5.9 baseline.

BREAKING CHANGE: removes the optional esm package fallback. ESM transformer loading now relies on Node >=22.12.0 native ESM support. Configuring isEsm: true on a .cts transformer entry is now rejected.

…require wrap with module.registerHooks

Drop ts-node for TypeScript transformer loading, replace it with direct TypeScript compiler API compilation and format classification, and swap the previous require-wrapper module interception for Node module.registerHooks().

Transformer source now supports nested TS imports, transformer tsConfig options, path aliases, package/module format inference, inline source maps, and scoped hook deregistration without relying on ts-node at runtime.

Classify transformer load format through TypeScript per-file emit-format workers so .mts/.cts, package "type", NodeNext semantics, and explicit transformer tsConfig settings follow compiler behavior. Known non-Node module wrappers are rejected, None/undecided formats fall back to the legacy CJS runtime behavior, and unknown future module kinds are treated as ESM.

Add module-format coverage for extension semantics, package/module inference, transformer tsConfig, unsupported module kinds, and runtime guidance for CJS/ESM mismatch cases.

BREAKING CHANGE: raises the Node.js floor to >=22.15.0 for module.registerHooks(). TypeScript transformer loading no longer uses ts-node; transformer module format is inferred from TypeScript compiler semantics, and the public isEsm option has been removed.