Method driveHmr

packages/compiler-cli/test/ngtsc/env.ts:370–387

(fileName: string, className: string)

  }

  driveHmr(fileName: string, className: string): string | null {
    const {rootNames, options} = readNgcCommandLineAndConfiguration(this.commandLineArgs);
    const host = createCompilerHost({options});
    const program = createProgram({rootNames, host, options});
    const sourceFile = program.getTsProgram().getSourceFile(fileName);

    if (sourceFile == null) {
      throw new Error(`Cannot find file at "${fileName}"`);
    }

    for (const node of sourceFile.statements) {
      if (ts.isClassDeclaration(node) && node.name != null && node.name.text === className) {
        return (program as NgtscProgram).compiler.emitHmrUpdateModule(node);
      }
    }

    throw new Error(`Cannot find class with name "${className}" in "${fileName}"`);
  }
}

class AugmentedCompilerHost extends NgtscTestCompilerHost {