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node_modules/eslint-plugin-react/lib/rules/style-prop-object.js

@@ -0,0 +1,93 @@
+/**
+ * @fileoverview Enforce style prop value is an object
+ * @author David Petersen
+ */
+
+'use strict';
+
+const variableUtil = require('../util/variable');
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Enforce style prop value is an object',
+      category: '',
+      recommended: false,
+      url: docsUrl('style-prop-object')
+    },
+    schema: []
+  },
+
+  create(context) {
+    /**
+     * @param {ASTNode} expression An Identifier node
+     * @returns {boolean}
+     */
+    function isNonNullaryLiteral(expression) {
+      return expression.type === 'Literal' && expression.value !== null;
+    }
+
+    /**
+     * @param {object} node A Identifier node
+     */
+    function checkIdentifiers(node) {
+      const variable = variableUtil.variablesInScope(context).find(item => item.name === node.name);
+
+      if (!variable || !variable.defs[0] || !variable.defs[0].node.init) {
+        return;
+      }
+
+      if (isNonNullaryLiteral(variable.defs[0].node.init)) {
+        context.report({
+          node,
+          message: 'Style prop value must be an object'
+        });
+      }
+    }
+
+    return {
+      CallExpression(node) {
+        if (
+          node.callee &&
+          node.callee.type === 'MemberExpression' &&
+          node.callee.property.name === 'createElement' &&
+          node.arguments.length > 1
+        ) {
+          if (node.arguments[1].type === 'ObjectExpression') {
+            const style = node.arguments[1].properties.find(property => property.key && property.key.name === 'style' && !property.computed);
+            if (style) {
+              if (style.value.type === 'Identifier') {
+                checkIdentifiers(style.value);
+              } else if (isNonNullaryLiteral(style.value)) {
+                context.report({
+                  node: style.value,
+                  message: 'Style prop value must be an object'
+                });
+              }
+            }
+          }
+        }
+      },
+
+      JSXAttribute(node) {
+        if (!node.value || node.name.name !== 'style') {
+          return;
+        }
+
+        if (node.value.type !== 'JSXExpressionContainer' || isNonNullaryLiteral(node.value.expression)) {
+          context.report({
+            node,
+            message: 'Style prop value must be an object'
+          });
+        } else if (node.value.expression.type === 'Identifier') {
+          checkIdentifiers(node.value.expression);
+        }
+      }
+    };
+  }
+};