Clone engine262 in /engine262

engine262/test/eslint-plugin-engine262/valid-feature.js

@@ -0,0 +1,32 @@
+'use strict';
+
+let features;
+try {
+  features = require('../..').FEATURES.map((f) => f.flag);
+} catch {}
+
+function isFeatureCall(node) {
+  return node.callee.type === 'MemberExpression'
+    && node.callee.computed === false
+    && node.callee.property.name === 'feature';
+}
+
+module.exports = {
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (!isFeatureCall(node)) {
+          return;
+        }
+        if (node.arguments.length !== 1) {
+          context.report(node, 'Invalid arguments passed to feature()');
+          return;
+        }
+        const featureName = node.arguments[0].value;
+        if (!features.includes(featureName)) {
+          context.report(node.arguments[0], `'${featureName}' is not a valid feature. Check src/engine.mjs.`);
+        }
+      },
+    };
+  },
+};