feat(linter): add cwd property to JS plugin Context (#14814)

- Closes: #14777

---------

Co-authored-by: Cameron Clark <cameron.clark@hey.com>

Author: magic-akari

apps/oxlint/src-js/plugins/context.ts

@@ -89,6 +89,9 @@ export interface InternalContext {
   messages: Record<string, string> | null;
 }
 
+// Cached current working directory.
+let cachedCwd: string | null = null;
+
 /**
  * Context class.
  *
@@ -132,6 +135,12 @@ export class Context {
     return getInternal(this, 'access `context.physicalFilename`').filePath;
   }
 
+  // Getter for current working directory.
+  get cwd() {
+    getInternal(this, 'access `context.cwd`');
+    return cachedCwd ??= process.cwd();
+  }
+
   // Getter for options for file being linted.
   get options() {
     return getInternal(this, 'access `context.options`').options;

apps/oxlint/test/fixtures/context_properties/plugin.ts

@@ -35,6 +35,14 @@ const rule: Rule = {
       node: SPAN,
     });
 
+    if (context.cwd.length === 0) {
+      context.report({ message: 'cwd.length === 0', node: SPAN });
+    }
+
+    if (context.cwd !== process.cwd()) {
+      context.report({ message: 'cwd !== process.cwd()', node: SPAN });
+    }
+
     if (this !== rule) context.report({ message: 'this !== rule', node: SPAN });
 
     return {