Refactored rules

rules/valid-requires.js

@@ -0,0 +1,36 @@
+const util = require('./util');
+
+exports.rule = {
+  meta: {
+    docs: {
+      description: 'require that all goog.require() have a valid arg and appear at the top level'
+    }
+  },
+
+  create: function(context) {
+    return {
+      CallExpression: function(expression) {
+        if (util.isRequireExpression(expression)) {
+          const ancestors = context.getAncestors();
+          const parent = ancestors[ancestors.length - 1];
+          if (parent.type !== 'ExpressionStatement') {
+            return context.report(expression, 'Expected goog.require() to in an expression statement');
+          }
+
+          if (ancestors.length !== 2) {
+            return context.report(expression, 'Expected goog.require() to be at the top level');
+          }
+
+          if (expression.arguments.length !== 1) {
+            return context.report(expression, 'Expected one argument for goog.require()');
+          }
+
+          const arg = expression.arguments[0];
+          if (arg.type !== 'Literal' || !arg.value || typeof arg.value !== 'string') {
+            return context.report(expression, 'Expected goog.require() to be called with a string');
+          }
+        }
+      }
+    };
+  }
+};