utils json.ts

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  import { SchematicsException, Tree } from '@angular-devkit/schematics';
 
export function readJsonFile<T>(tree: Tree, filePath: string): T {
  const buffer = tree.read(filePath);
  if (buffer === null) {
    throw new SchematicsException(`Could not read ${filePath}`);
  }
  try {
    return JSON.parse(buffer.toString());
  } catch (error) {
    throw new SchematicsException(`Invalid ${filePath}`);
  }
}