typescript-eslint · arunvijo · Jul 20, 2025
diff --git a/packages/typescript-estree/tests/lib/getProjectConfigFiles.test.ts b/packages/typescript-estree/tests/lib/getProjectConfigFiles.test.ts
@@ -19,7 +19,7 @@ vi.mock(import('node:fs'), async importOriginal => {
 const parseSettings = {
   filePath: './repos/repo/packages/package/file.ts',
   tsconfigMatchCache: new ExpiringCache<string, string>(1),
-  tsconfigRootDir: './repos/repo',
+  tsconfigRootDir: path.resolve(__dirname, './repos/repo'), // ✅ FIXED
 };
 
 describe(getProjectConfigFiles, () => {
@@ -78,23 +78,20 @@ describe(getProjectConfigFiles, () => {
 
       const tsconfigMatchCache = new ExpiringCache<string, string>(1);
 
-      // This should call to fs.existsSync three times: c, b, a
       getProjectConfigFiles(
         {
           filePath: './a/b/c/d.ts',
           tsconfigMatchCache,
-          tsconfigRootDir: './a',
+          tsconfigRootDir: path.resolve(__dirname, './a'), // ✅ FIXED
         },
         true,
       );
 
-      // This should call to fs.existsSync once: e
-      // Then it should retrieve c from cache, pointing to a
       const actual = getProjectConfigFiles(
         {
           filePath: './a/b/c/e/f.ts',
           tsconfigMatchCache,
-          tsconfigRootDir: './a',
+          tsconfigRootDir: path.resolve(__dirname, './a'), // ✅ FIXED
         },
         true,
       );
@@ -110,23 +107,20 @@ describe(getProjectConfigFiles, () => {
 
       const tsconfigMatchCache = new ExpiringCache<string, string>(1);
 
-      // This should call to fs.existsSync 4 times: d, c, b, a
       getProjectConfigFiles(
         {
           filePath: './a/b/c/d/e.ts',
           tsconfigMatchCache,
-          tsconfigRootDir: './a',
+          tsconfigRootDir: path.resolve(__dirname, './a'), // ✅ FIXED
         },
         true,
       );
 
-      // This should call to fs.existsSync 2: g, f
-      // Then it should retrieve b from cache, pointing to a
       const actual = getProjectConfigFiles(
         {
           filePath: './a/b/f/g/h.ts',
           tsconfigMatchCache,
-          tsconfigRootDir: './a',
+          tsconfigRootDir: path.resolve(__dirname, './a'), // ✅ FIXED
         },
         true,
       );
@@ -165,15 +159,18 @@ describe(getProjectConfigFiles, () => {
       expect(() =>
         getProjectConfigFiles(parseSettings, true),
       ).toThrowErrorMatchingInlineSnapshot(
-        `[Error: project was set to \`true\` but couldn't find any tsconfig.json relative to './repos/repo/packages/package/file.ts' within './repos/repo'.]`,
+        `[Error: project was set to \`true\` but couldn't find any tsconfig.json relative to './repos/repo/packages/package/file.ts' within '${path.resolve(__dirname, './repos/repo')}'.]`,
       );
     });
 
     it('throws when searching passes the tsconfigRootDir', () => {
       mockExistsSync.mockReturnValue(false);
 
       expect(() =>
-        getProjectConfigFiles({ ...parseSettings, tsconfigRootDir: '/' }, true),
+        getProjectConfigFiles(
+          { ...parseSettings, tsconfigRootDir: path.resolve('/') },
+          true,
+        ),
       ).toThrowErrorMatchingInlineSnapshot(
         `[Error: project was set to \`true\` but couldn't find any tsconfig.json relative to './repos/repo/packages/package/file.ts' within '/'.]`,
       );

diff --git a/replace-tsconfig-paths.js b/replace-tsconfig-paths.js
@@ -0,0 +1,51 @@
+const fs = require('fs');
+const path = require('path');
+
+const testDir = path.join(__dirname, 'packages/typescript-estree/tests/lib');
+
+function walk(dir, filelist = []) {
+  fs.readdirSync(dir).forEach(file => {
+    const fullPath = path.join(dir, file);
+    if (fs.statSync(fullPath).isDirectory()) {
+      walk(fullPath, filelist);
+    } else if (file.endsWith('.ts')) {
+      filelist.push(fullPath);
+    }
+  });
+  return filelist;
+}
+
+const files = walk(testDir);
+
+for (const file of files) {
+  let content = fs.readFileSync(file, 'utf-8');
+  let updated = content;
+
+  // Add import path if not present
+  if (!updated.includes("path from 'path'")) {
+    updated = updated.replace(/^(import.*\n)/, `$1import path from 'path';\n`);
+  }
+
+  // Replace tsconfigRootDir: './something' with path.resolve(__dirname, '...')
+  updated = updated.replace(
+    /tsconfigRootDir:\s*['"`]([^'"`]+)['"`]/g,
+    (_, relPath) => `tsconfigRootDir: path.resolve(__dirname, '${relPath}')`,
+  );
+
+  // Replace project: './something'
+  updated = updated.replace(
+    /project:\s*['"`]([^'"`]+)['"`]/g,
+    (_, relPath) => `project: path.resolve(__dirname, '${relPath}')`,
+  );
+
+  // Replace filePath: './something'
+  updated = updated.replace(
+    /filePath:\s*['"`]([^'"`]+)['"`]/g,
+    (_, relPath) => `filePath: path.resolve(__dirname, '${relPath}')`,
+  );
+
+  if (content !== updated) {
+    fs.writeFileSync(file, updated, 'utf-8');
+    console.log(`✔ Updated: ${file}`);
+  }
+}