Mutable target environment to assign into.
Absolute path to the dynamic module file.
Selected environment name (if any).
Cache subdirectory under .tsbuild/ for compiled artifacts.
A Promise\<void\> which resolves after the module (if present) has been applied.
Load a default-export dynamic map from a JS/TS file and apply it. Uses util/loadModuleDefault for robust TS handling (direct import, esbuild, typescript.transpile fallback).
Error behavior: