Allow non-leading underscores (#94)

Author: jaskp

src/only-export-components.test.ts

@@ -29,6 +29,10 @@ const valid = [
     name: "Direct export AF component with number",
     code: "export const Foo2 = () => {};",
   },
+  {
+    name: "Direct export AF component with underscore",
+    code: "export const Foo_ = () => {};",
+  },
   {
     name: "Direct export uppercase function",
     code: "export function CMS() {};",
@@ -226,6 +230,11 @@ const invalid = [
     code: "export const foo = () => {}; export const Bar = () => {};",
     errorId: "namedExport",
   },
+  {
+    name: "Component and underscored component",
+    code: "export const _Foo = () => {}; export const Foo = () => {};",
+    errorId: "namedExport",
+  },
   {
     name: "Component and function with allowConstantExport",
     code: "export const foo = () => {}; export const Bar = () => {};",

src/only-export-components.ts

@@ -1,7 +1,7 @@
 import type { TSESLint } from "@typescript-eslint/utils";
 import type { TSESTree } from "@typescript-eslint/types";
 
-const reactComponentNameRE = /^[A-Z][a-zA-Z0-9]*$/u;
+const reactComponentNameRE = /^[A-Z][a-zA-Z0-9_]*$/u;
 
 export const onlyExportComponents: TSESLint.RuleModule<
   | "exportAll"