Function getBase

src/util.ts:59–103

* Recursively iterate through the dependency chain until we reach the end of * the dependency chain or encounter a circular reference * @param filePath Filepath of file currently being read * @param customReadFilep The file reading function being used * @param readFiles an array of the previousl

(
  filePath: string,
  customReadFilep: ReadFileP,
  readFiles: Set<string>,
  currentDir: string,
)

 * returns a ConfigFile object containing the data from all the dependencies
 */
async function getBase(
  filePath: string,
  customReadFilep: ReadFileP,
  readFiles: Set<string>,
  currentDir: string,
): Promise<ConfigFile> {
  customReadFilep = customReadFilep || readFilep;

  filePath = path.resolve(currentDir, filePath);

  // An error is thrown if there is a circular reference as specified by the
  // TypeScript doc
  if (readFiles.has(filePath)) {
    throw new Error(`Circular reference in ${filePath}`);
  }
  readFiles.add(filePath);
  try {
    const json = await customReadFilep(filePath, 'utf8');
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    let contents: any;
    try {
      contents = JSON5.parse(json);
    } catch (e) {
      const err = e as Error;
      err.message = `Unable to parse ${filePath}!\n${err.message}`;
      throw err;
    }

    if (contents.extends) {
      const nextFile = await getBase(
        contents.extends,
        customReadFilep,
        readFiles,
        path.dirname(filePath),
      );
      contents = combineTSConfig(nextFile, contents);
    }

    return contents;
  } catch (e) {
    const err = e as Error;
    err.message = `Error: ${filePath}\n${err.message}`;
    throw err;
  }
}

/**
 * Takes in 2 config files