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node_modules/eslint-plugin-react/lib/rules/no-multi-comp.js

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+/**
+ * @fileoverview Prevent multiple component definition per file
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+const Components = require('../util/Components');
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Prevent multiple component definition per file',
+      category: 'Stylistic Issues',
+      recommended: false,
+      url: docsUrl('no-multi-comp')
+    },
+
+    schema: [{
+      type: 'object',
+      properties: {
+        ignoreStateless: {
+          default: false,
+          type: 'boolean'
+        }
+      },
+      additionalProperties: false
+    }]
+  },
+
+  create: Components.detect((context, components, utils) => {
+    const configuration = context.options[0] || {};
+    const ignoreStateless = configuration.ignoreStateless || false;
+
+    const MULTI_COMP_MESSAGE = 'Declare only one React component per file';
+
+    /**
+     * Checks if the component is ignored
+     * @param {Object} component The component being checked.
+     * @returns {Boolean} True if the component is ignored, false if not.
+     */
+    function isIgnored(component) {
+      return (
+        ignoreStateless && (
+          /Function/.test(component.node.type) ||
+          utils.isPragmaComponentWrapper(component.node)
+        )
+      );
+    }
+
+    // --------------------------------------------------------------------------
+    // Public
+    // --------------------------------------------------------------------------
+
+    return {
+      'Program:exit': function () {
+        if (components.length() <= 1) {
+          return;
+        }
+
+        const list = components.list();
+
+        Object.keys(list).filter(component => !isIgnored(list[component])).forEach((component, i) => {
+          if (i >= 1) {
+            context.report({
+              node: list[component].node,
+              message: MULTI_COMP_MESSAGE
+            });
+          }
+        });
+      }
+    };
+  })
+};