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node_modules/eslint-plugin-react/lib/rules/jsx-filename-extension.js

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+/**
+ * @fileoverview Restrict file extensions that may contain JSX
+ * @author Joe Lencioni
+ */
+
+'use strict';
+
+const path = require('path');
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Constants
+// ------------------------------------------------------------------------------
+
+const DEFAULTS = {
+  extensions: ['.jsx']
+};
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Restrict file extensions that may contain JSX',
+      category: 'Stylistic Issues',
+      recommended: false,
+      url: docsUrl('jsx-filename-extension')
+    },
+
+    schema: [{
+      type: 'object',
+      properties: {
+        extensions: {
+          type: 'array',
+          items: {
+            type: 'string'
+          }
+        }
+      },
+      additionalProperties: false
+    }]
+  },
+
+  create(context) {
+    let invalidExtension;
+    let invalidNode;
+
+    function getExtensionsConfig() {
+      return context.options[0] && context.options[0].extensions || DEFAULTS.extensions;
+    }
+
+    function handleJSX(node) {
+      const filename = context.getFilename();
+      if (filename === '<text>') {
+        return;
+      }
+
+      if (invalidNode) {
+        return;
+      }
+
+      const allowedExtensions = getExtensionsConfig();
+      const isAllowedExtension = allowedExtensions.some(extension => filename.slice(-extension.length) === extension);
+
+      if (isAllowedExtension) {
+        return;
+      }
+
+      invalidNode = node;
+      invalidExtension = path.extname(filename);
+    }
+
+    // --------------------------------------------------------------------------
+    // Public
+    // --------------------------------------------------------------------------
+
+    return {
+      JSXElement: handleJSX,
+      JSXFragment: handleJSX,
+
+      'Program:exit': function () {
+        if (!invalidNode) {
+          return;
+        }
+
+        context.report({
+          node: invalidNode,
+          message: `JSX not allowed in files with extension '${invalidExtension}'`
+        });
+      }
+    };
+  }
+};