feat: add html-w3c-validator command

src/utils/__test__/isExistingPath.test.ts

@@ -0,0 +1,29 @@
+import fsMock from 'mock-fs'
+
+import { isExistingPath } from '../isExistingPath.js'
+
+describe('utils/isExistingFile', () => {
+  afterEach(async () => {
+    fsMock.restore()
+  })
+
+  it('should return true if the file exists', async () => {
+    fsMock(
+      {
+        '/file.txt': ''
+      },
+      { createCwd: false }
+    )
+    expect(await isExistingPath('/file.txt')).toBeTruthy()
+  })
+
+  it("should return false if the file doesn't exists", async () => {
+    fsMock(
+      {
+        '/file.txt': ''
+      },
+      { createCwd: false }
+    )
+    expect(await isExistingPath('/randomfile.txt')).toBeFalsy()
+  })
+})

src/utils/isExistingPath.ts

@@ -0,0 +1,10 @@
+import fs from 'node:fs'
+
+export const isExistingPath = async (path: string): Promise<boolean> => {
+  try {
+    await fs.promises.access(path, fs.constants.F_OK)
+    return true
+  } catch {
+    return false
+  }
+}