message: refactor(compiler): remove TypeScript 4.0 program reuse check
  We no longer support TS 4.0, hence this check is redundant.
  PR Close
diff: @@ -668,10 +668,7 @@ class AngularCompilerProgram implements Program {
  // - we cache all the files in the hostAdapter
  // - new new stubs use the exactly same imports/exports as the old once (we assert that in
  // hostAdapter.updateGeneratedFile).
  - // TS 4.1+ stores the reuse state in the new program
  - const checkReuseProgram =
  - (ts.versionMajorMinor as string) === '4.0' ? tmpProgram : this._tsProgram;
  - if (tsStructureIsReused(checkReuseProgram) !== StructureIsReused.Completely) {
  + if (tsStructureIsReused(this._tsProgram) !== StructureIsReused.Completely) {
  throw new Error(`Internal Error: The structure of the program changed during codegen.`);
  }
  }
  