How to use the app-builder-lib/out/util/config.getConfig function in app-builder-lib

export async function installAppDeps(args: any) {
  try {
    log.info({version: PACKAGE_VERSION}, "electron-builder")
  }
  catch (e) {
    // error in dev mode without babel
    if (!(e instanceof ReferenceError)) {
      throw e
    }
  }

  const projectDir = process.cwd()
  const packageMetadata = new Lazy(() => orNullIfFileNotExist(readJson(path.join(projectDir, "package.json"))))
  const config = await getConfig(projectDir, null, null, packageMetadata)
  const results = await Promise.all([
    computeDefaultAppDirectory(projectDir, use(config.directories, it => it!.app)),
    getElectronVersion(projectDir, config, packageMetadata),
  ])

  // if two package.json — force full install (user wants to install/update app deps in addition to dev)
  await installOrRebuild(config, results[0], {
    frameworkInfo: {version: results[1], useCustomDist: true},
    platform: args.platform,
    arch: args.arch,
    productionDeps: createLazyProductionDeps(results[0], null),
  }, results[0] !== projectDir)
}

async function build(): Promise<{ packageFile: string }> {
    const packager = new Packager({
        targets: Platform.LINUX.createTarget("appimage"),
        config: await getConfig(
            CWD,
            path.join(CWD, "./electron-builder.yml"),
            null,
        ),
    });
    const {artifactPaths: [packageFile]} = await packager.build();

    if (!String(packageFile).endsWith(".AppImage")) {
        throw new Error(`Invalid artifact: "${packageFile}"`);
    }

    return {packageFile};
}

async function build(): Promise<{ packageFile: string }> {
    const packager = new Packager({
        targets: Platform.LINUX.createTarget("snap"),
        config: await getConfig(
            CWD,
            path.join(CWD, "./electron-builder.yml"),
            null,
        ),
    });
    const {artifactPaths: [packageFile]} = await packager.build();

    if (!String(packageFile).endsWith(".snap")) {
        throw new Error(`Invalid artifact: "${packageFile}"`);
    }

    return {packageFile};
}