Function readFileFromDirectory

src/utils.ts:817–842

(
  directory: string,
  file: string,
)

 * Retrieves a file from the directory.
 */
export function readFileFromDirectory(
  directory: string,
  file: string,
): Promise<{ source: string; sourceDirectory: string }> {
  return new Promise<string>((resolve, reject) => {
    fs.readFile(path.resolve(directory, file), "utf8", (err, data) => {
      if (err) {
        if (err.code === "ENOENT") {
          return reject(
            new FirebaseError(`Could not find "${file}" in "${directory}"`, { original: err }),
          );
        }
        reject(
          new FirebaseError(`Failed to read file "${file}" in "${directory}"`, { original: err }),
        );
      } else {
        resolve(data);
      }
    });
  }).then((source) => {
    return {
      source,
      sourceDirectory: directory,
    };
  });
}

/**
 * Wrapps `yaml.safeLoad` with an error handler to present better YAML parsing