fix: support Rslint v0.9.0 config paths

Author: chenjiahan

packages/rstack/src/rslintConfig.ts

@@ -1,3 +1,5 @@
+import { existsSync } from 'node:fs';
+import { join } from 'node:path';
 import { loadRstackConfig, type LoadedRstackConfig } from './config.ts';
 import type { RslintConfig } from '@rslint/core';
 
@@ -16,4 +18,32 @@ if (typeof lintDefinition === 'function') {
   lintConfig = lintDefinition;
 }
 
-export default lintConfig;
+const basePath = process.cwd();
+const lintEntries = lintConfig.flat();
+
+// Rslint resolves entries without a basePath from the explicit config file.
+// Rstack's explicit config is this internal module, so preserve the historical
+// behavior of resolving user-authored paths from the invocation directory.
+const resolvedLintConfig: RslintConfig = lintEntries.map((entry) => ({
+  basePath,
+  ...entry,
+}));
+
+const hasExplicitProject = lintEntries.some(
+  (entry) => entry.languageOptions?.parserOptions?.project !== undefined,
+);
+
+// Rslint's implicit tsconfig lookup also follows the internal config directory.
+// Preserve the CWD lookup without overriding user projects.
+if (!hasExplicitProject && existsSync(join(basePath, 'tsconfig.json'))) {
+  resolvedLintConfig.push({
+    basePath,
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.json'],
+      },
+    },
+  });
+}
+
+export default resolvedLintConfig;

packages/rstack/tests/config/define-lint-base-path/index.test.ts

@@ -0,0 +1,20 @@
+import { writeFile } from 'node:fs/promises';
+import path from 'node:path';
+import { test } from '#test-helpers';
+import { expect } from 'rstack/test';
+
+test('should preserve an explicit basePath', async ({
+  cwd,
+  execCli,
+  logHelper,
+}) => {
+  const filePath = path.join(cwd, 'src/index.js');
+  await writeFile(filePath, `alert('hello');\n`);
+
+  try {
+    expect(() => execCli('lint src/index.js')).toThrow();
+    await logHelper.expectLog('Unexpected alert');
+  } finally {
+    await writeFile(filePath, `console.log('hello');\n`);
+  }
+});

packages/rstack/tests/config/define-lint-base-path/rstack.config.ts

@@ -0,0 +1,11 @@
+import { define } from 'rstack';
+
+define.lint([
+  {
+    basePath: 'src',
+    files: ['index.js'],
+    rules: {
+      'no-alert': 'error',
+    },
+  },
+]);

packages/rstack/tests/config/define-lint-base-path/src/index.js

@@ -0,0 +1 @@
+console.log('hello');

pnpm-lock.yaml

@@ -17,7 +17,7 @@ catalog:
   '@rsbuild/plugin-react': '^2.1.0'
   '@rsbuild/plugin-sass': '^2.0.1'
   '@rslib/core': '~1.0.0-rc.2'
-  '@rslint/core': '0.8.1'
+  '@rslint/core': '0.9.0'
   '@rspress/core': '^2.0.20'
   '@rspress/plugin-client-redirects': '^2.0.20'
   '@rspress/plugin-sitemap': '^2.0.20'