Even simpler

packages/aws-cdk/lib/api/util/rwlock.ts

@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import { promises as fs } from 'fs';
 import * as path from 'path';
 
@@ -11,7 +12,6 @@ import * as path from 'path';
  * This class is not 100% race safe, but in practice it should be a lot
  * better than the 0 protection we have today.
  */
-/* istanbul ignore next */
 export class RWLock {
   private readonly pidString: string;
   private readonly writerFile: string;
@@ -159,7 +159,6 @@ export interface IWriterLock extends ILock {
   convertToReaderLock(): Promise<ILock>;
 }
 
-/* istanbul ignore next */
 async function readFileIfExists(filename: string): Promise<string | undefined> {
   try {
     return await fs.readFile(filename, { encoding: 'utf-8' });
@@ -170,15 +169,13 @@ async function readFileIfExists(filename: string): Promise<string | undefined> {
 }
 
 let tmpCounter = 0;
-/* istanbul ignore next */
 async function writeFileAtomic(filename: string, contents: string): Promise<void> {
   await fs.mkdir(path.dirname(filename), { recursive: true });
   const tmpFile = `${filename}.${process.pid}_${++tmpCounter}`;
   await fs.writeFile(tmpFile, contents, { encoding: 'utf-8' });
   await fs.rename(tmpFile, filename);
 }
 
-/* istanbul ignore next */
 async function deleteFile(filename: string) {
   try {
     await fs.unlink(filename);
@@ -190,7 +187,6 @@ async function deleteFile(filename: string) {
   }
 }
 
-/* istanbul ignore next */
 function processExists(pid: number) {
   try {
     process.kill(pid, 0);