Create rule enforcing that goog.provide() is like the path

rules/valid-provide.js

@@ -0,0 +1,58 @@
+'use strict';
+
+const path = require('path');
+const util = require('./util');
+
+const sourceRoot = path.join(__dirname, '..', 'src');
+
+exports.rule = {
+  meta: {
+    docs: {
+      description: 'require the first goog.provide() has an arg named like the file path'
+    }
+  },
+
+  create: function(context) {
+    let gotFirst = false;
+    return {
+      CallExpression: function(expression) {
+        if (gotFirst) {
+          return;
+        }
+        if (util.isProvideExpression(expression)) {
+          gotFirst = true;
+          const parent = expression.parent;
+          if (parent.type !== 'ExpressionStatement') {
+            return context.report(expression, 'Expected goog.provide() to in an expression statement');
+          }
+
+          if (parent.parent.type !== 'Program') {
+            return context.report(expression, 'Expected goog.provide() 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');
+          }
+
+          const filePath = path.relative(sourceRoot, context.getFilename());
+          let ext;
+          if (path.basename(filePath) === 'index.js') {
+            ext = path.sep + 'index.js';
+          } else {
+            ext = '.js';
+          }
+          const name = arg.value;
+          const expectedPath = name.split('.').join(path.sep) + ext;
+          if (expectedPath.toLowerCase() !== filePath.toLowerCase()) {
+            return context.report(expression, `Expected goog.provide('${name}') to be like ${filePath}`);
+          }
+        }
+      }
+    };
+  }
+};