Function getConfig

packages/plugin-lighthouse/src/lib/runner/utils.ts:128–177

(
  options: ConfigOptions = {},
)

>;

export async function getConfig(
  options: ConfigOptions = {},
): Promise<Config | undefined> {
  const { configPath, preset } = options;

  if (configPath != null) {
    // Resolve the config file path relative to where cli was called.
    return logger.task(
      `Loading lighthouse config from ${configPath}`,
      async () => {
        const message = `Loaded lighthouse config from ${configPath}`;
        if (configPath.endsWith('.json')) {
          return { message, result: await readJsonFile<Config>(configPath) };
        }
        if (/\.(ts|js|mjs)$/.test(configPath)) {
          return {
            message,
            result: await importModule<Config>({
              filepath: configPath,
            }),
          };
        }
        throw new Error(
          `Unknown Lighthouse config file extension in ${configPath}`,
        );
      },
    );
  }

  if (preset != null) {
    const supportedPresets: Record<
      NonNullable<LighthouseCliFlags['preset']>,
      Config
    > = {
      desktop: desktopConfig,
      perf: perfConfig,
      experimental: experimentalConfig,
    };
    // in reality, the preset could be a string not included in the type definition
    const config: Config | undefined = supportedPresets[preset];
    if (config) {
      logger.info(`Loaded config from ${ansis.bold(preset)} preset`);
      return config;
    } else {
      logger.warn(`Preset "${preset}" is not supported`);
    }
  }

  return undefined;
}

export function enrichFlags(
  flags: LighthouseCliFlags,