Refactored rules

rules/no-duplicate-requires.js

@@ -0,0 +1,46 @@
+const util = require('./util');
+
+exports.rule = {
+  meta: {
+    docs: {
+      description: 'disallow duplicate goog.require() calls'
+    },
+    fixable: 'code'
+  },
+
+  create: function(context) {
+    const alreadyRequired = {};
+
+    return {
+      ExpressionStatement: function(statement) {
+        if (util.isRequireStatement(statement)) {
+          const expression = statement.expression;
+
+          if (!expression.arguments[0]) {
+            return;
+          }
+          const name = expression.arguments[0].value;
+
+          if (alreadyRequired[name]) {
+            const source = context.getSourceCode();
+
+            return context.report({
+              node: statement,
+              message: `Duplicate goog.require('${name}')`,
+              fix: function(fixer) {
+                const afterToken = source.getTokenAfter(statement);
+                const range = [
+                  statement.range[0],
+                  afterToken ? afterToken.range[0] : statement.range[1]
+                ];
+                return fixer.removeRange(range);
+              }
+            });
+          }
+          alreadyRequired[name] = true;
+        }
+      }
+    };
+  }
+
+};