Method concat

lib/lines.ts:695–700

(...args: (string | Lines)[])

  }

  concat(...args: (string | Lines)[]) {
    const list: typeof args = [this];
    list.push.apply(list, args);
    assert.strictEqual(list.length, args.length + 1);
    return emptyLines.join(list);
  }
}

const fromStringCache: any = {};