Consistent Jsx case in variables (#9871)

scripts/tools/eslint-plugin-prettier-internal-rules/index.js

@@ -4,6 +4,7 @@ module.exports = {
   rules: {
     "better-parent-property-check-in-needs-parens": require("./better-parent-property-check-in-needs-parens"),
     "directly-loc-start-end": require("./directly-loc-start-end"),
+    "jsx-identifier-case": require("./jsx-identifier-case"),
     "no-node-comments": require("./no-node-comments"),
     "prefer-fast-path-each": require("./prefer-fast-path-each"),
     "require-json-extensions": require("./require-json-extensions"),

scripts/tools/eslint-plugin-prettier-internal-rules/jsx-identifier-case.js

@@ -0,0 +1,46 @@
+"use strict";
+
+const MESSAGE_ID = "jsx-identifier-case";
+
+// To ignore variables, config eslint like this
+// {'prettier-internal-rules/jsx-identifier-case': ['error', 'name1', ... 'nameN']}
+
+module.exports = {
+  meta: {
+    type: "suggestion",
+    docs: {
+      url:
+        "https://github.com/prettier/prettier/blob/master/scripts/eslint-plugin-prettier-internal-rules/jsx-identifier-case.js",
+    },
+    messages: {
+      [MESSAGE_ID]: "Please rename '{{name}}' to '{{fixed}}'.",
+    },
+    fixable: "code",
+  },
+  create(context) {
+    const ignored = new Set(context.options);
+    return {
+      "Identifier[name=/JSX/]:not(ObjectExpression > Property.properties > .key)"(
+        node
+      ) {
+        const { name } = node;
+
+        if (ignored.has(name)) {
+          return;
+        }
+
+        const fixed = name.replace(/JSX/g, "Jsx");
+        context.report({
+          node,
+          messageId: MESSAGE_ID,
+          data: { name, fixed },
+          fix: (fixer) => fixer.replaceText(node, fixed),
+        });
+      },
+    };
+  },
+  schema: {
+    type: "array",
+    uniqueItems: true,
+  },
+};