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node_modules/eslint-plugin-react/lib/rules/jsx-no-literals.js

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+/**
+ * @fileoverview Prevent using string literals in React component definition
+ * @author Caleb Morris
+ * @author David Buchan-Swanson
+ */
+
+'use strict';
+
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Prevent using string literals in React component definition',
+      category: 'Stylistic Issues',
+      recommended: false,
+      url: docsUrl('jsx-no-literals')
+    },
+
+    schema: [{
+      type: 'object',
+      properties: {
+        noStrings: {
+          type: 'boolean'
+        },
+        allowedStrings: {
+          type: 'array',
+          uniqueItems: true,
+          items: {
+            type: 'string'
+          }
+        }
+      },
+      additionalProperties: false
+    }]
+  },
+
+  create(context) {
+    const isNoStrings = context.options[0] ? context.options[0].noStrings : false;
+    const allowedStrings = context.options[0] ? new Set(context.options[0].allowedStrings) : false;
+
+    const message = isNoStrings ?
+      'Strings not allowed in JSX files' :
+      'Missing JSX expression container around literal string';
+
+    function reportLiteralNode(node) {
+      context.report({
+        node,
+        message: `${message}: “${context.getSourceCode().getText(node).trim()}”`
+      });
+    }
+
+    function getParentIgnoringBinaryExpressions(node) {
+      let current = node;
+      while (current.parent.type === 'BinaryExpression') {
+        current = current.parent;
+      }
+      return current.parent;
+    }
+
+    function getValidation(node) {
+      if (allowedStrings && allowedStrings.has(node.value)) {
+        return false;
+      }
+      const parent = getParentIgnoringBinaryExpressions(node);
+      const standard = !/^[\s]+$/.test(node.value) &&
+          typeof node.value === 'string' &&
+          parent.type.indexOf('JSX') !== -1 &&
+          parent.type !== 'JSXAttribute';
+      if (isNoStrings) {
+        return standard;
+      }
+      return standard && parent.type !== 'JSXExpressionContainer';
+    }
+
+    // --------------------------------------------------------------------------
+    // Public
+    // --------------------------------------------------------------------------
+
+    return {
+
+      Literal(node) {
+        if (getValidation(node)) {
+          reportLiteralNode(node);
+        }
+      },
+
+      JSXText(node) {
+        if (getValidation(node)) {
+          reportLiteralNode(node);
+        }
+      },
+
+      TemplateLiteral(node) {
+        const parent = getParentIgnoringBinaryExpressions(node);
+        if (isNoStrings && parent.type === 'JSXExpressionContainer') {
+          reportLiteralNode(node);
+        }
+      }
+
+    };
+  }
+};