chore: consolidate eslint rules (googleapis#8155)

* feat: centralize ESLint configurations inside the packages directory

* feat: add centralized eslint configurations

* test: update expected unique file paths count for consolidated eslint rules

* test: resolve Windows-specific test failures in gapic-node-processing

Author: shivanee-p

…lytics-data-v1alpha-nodejs/.eslintignore packages/.eslintignorepackages/gapic-node-processing/test/fixtures/combined-library/google-analytics-data-nodejs/analytics-data-v1alpha-nodejs/.eslintignore renamed to packages/.eslintignore packages/gapic-node-processing/test/fixtures/combined-library/google-analytics-data-nodejs/analytics-data-v1alpha-nodejs/.eslintignore renamed to packages/.eslintignore

@@ -0,0 +1,4 @@
+{
+  "extends": "../node_modules/gts",
+  "root": true
+}

packages/.eslintrc.json

@@ -162,8 +162,10 @@ export async function generateFinalDirectoryPath(
   const uniquefullPathAndContent = [];
 
   for (const fullPathAndContent of fullPathsAndContents) {
-    if (!uniquePaths.has(fullPathAndContent.filePath)) {
-      uniquePaths.add(fullPathAndContent.filePath);
+    const normalizedPath = fullPathAndContent.filePath.replace(/\\/g, '/');
+    fullPathAndContent.filePath = normalizedPath;
+    if (!uniquePaths.has(normalizedPath)) {
+      uniquePaths.add(normalizedPath);
       uniquefullPathAndContent.push(fullPathAndContent);
     }
   }
@@ -203,9 +205,10 @@ export function setOnlyDefaultSystemTests(
 
   for (let i = filePaths.length - 1; i >= 0; i--) {
     const filePathObj = filePaths[i];
+    const normalizedPath = filePathObj.filePath.replace(/\\/g, '/');
     if (
-      systemTestRegex.test(filePathObj.filePath) &&
-      !filePathObj.filePath.includes(defaultVersion)
+      systemTestRegex.test(normalizedPath) &&
+      !normalizedPath.includes(defaultVersion)
     ) {
       filePaths.splice(i, 1);
     }

packages/gapic-node-processing/.eslintignore

@@ -60,17 +60,19 @@ export async function getSamplesMetadata(
   // which we then use to remove from the absolute filePath (so
   // /google-cloud-node/packages/gapic-node-processing/test/fixtures/combined-library/google-cloud-speech/samples/generated/v1/adaptation.create_custom_class.js
   // becomes just google-cloud-speech/samples/generated/v1/adaptation.create_custom_class.js (the relative path to the new directory)
-  const stringToRemove = currentLibrary
+  const normalizedLibrary = currentLibrary.replace(/\\/g, '/');
+  const stringToRemove = normalizedLibrary
     .split('/')
-    .slice(0, currentLibrary.split('/').length - 1)
+    .slice(0, normalizedLibrary.split('/').length - 1)
     .join('/');
 
   const samples = await traverseDirectory(
     path.join(currentLibrary, SAMPLES_PATH),
     [],
   );
   samples.map(sample => {
-    sample.filePath = sample.filePath
+    const normalizedSamplePath = sample.filePath.replace(/\\/g, '/');
+    sample.filePath = normalizedSamplePath
       .replace(stringToRemove, '')
       .replace('-nodejs', '');
     Object.assign(sample, {title: getSampleName(sample)});
@@ -93,9 +95,10 @@ export async function getSamplesMetadata(
  */
 export function getSampleName(sample: {filePath: string}): string {
   // Get just the sample name from the path
-  let sampleName = sample.filePath;
+  const normalizedPath = sample.filePath.replace(/\\/g, '/');
+  let sampleName = normalizedPath;
   try {
-    sampleName = sampleName.split('/')[sample.filePath.split('/').length - 1];
+    sampleName = sampleName.split('/')[normalizedPath.split('/').length - 1];
     // Remove the API name
     sampleName = sampleName.split('.')[1];
     // Remove the .js

packages/gapic-node-processing/.eslintrc.json

@@ -84,7 +84,7 @@ describe('combine libraries', () => {
   it('should generate unique final directory paths', async () => {
     const libraryPaths = await generateFinalDirectoryPath(libraryConfigCJS);
     // This should be the amount of unique file paths in the tree directory
-    assert.deepStrictEqual(libraryPaths.length, 102);
+    assert.deepStrictEqual(libraryPaths.length, 100);
 
     // Confirm there are only unique items in the array
     assert.deepStrictEqual(