fix(scoped-jsx): Don't add JSX import if JSX is already imported (#458)

Co-authored-by: Sebastian "Sebbie" Silbermann <sebastian.silbermann@vercel.com>

Author: henryqdineen

.changeset/olive-suns-crash.md

@@ -0,0 +1,5 @@
+---
+"types-react-codemod": patch
+---
+
+fix(scoped-jsx): Don't add `JSX` import if `JSX` is already imported

transforms/__tests__/scoped-jsx.js

@@ -191,4 +191,16 @@ describe("transform scoped-jsx", () => {
 		[].reduce((acc, component, i) => {})"
 	`);
 	});
+
+	test("existing JSX import from jsx-runtime", () => {
+		expect(
+			applyTransform(`
+				import { JSX } from 'react/jsx-runtime';
+				declare const element: JSX.Element;
+			`),
+		).toMatchInlineSnapshot(`
+		"import { JSX } from 'react/jsx-runtime';
+		declare const element: JSX.Element;"
+	`);
+	});
 });

transforms/scoped-jsx.js

@@ -9,7 +9,7 @@ const traverse = require("@babel/traverse").default;
  * @param {import('jscodeshift').FileInfo} file
  * @param {import('jscodeshift').API} api
  */
-const deprecatedReactChildTransform = (file, api) => {
+const scopedJsxTransform = (file, api) => {
 	const j = api.jscodeshift;
 	const ast = parseSync(file);
 
@@ -34,7 +34,7 @@ const deprecatedReactChildTransform = (file, api) => {
 		},
 	});
 
-	if (hasGlobalNamespaceReferences) {
+	if (hasGlobalNamespaceReferences && !isJsxAlreadyImported(j, ast)) {
 		const reactImport = findReactImportForNewImports(j, ast);
 		const jsxImportSpecifier = reactImport.find(j.ImportSpecifier, {
 			imported: { name: "JSX" },
@@ -73,4 +73,16 @@ const deprecatedReactChildTransform = (file, api) => {
 	return file.source;
 };
 
-module.exports = deprecatedReactChildTransform;
+/**
+ * @param {import('jscodeshift').API['jscodeshift']} j
+ * @param {import('jscodeshift').Collection} ast
+ */
+function isJsxAlreadyImported(j, ast) {
+	return (
+		ast.find(j.ImportSpecifier, {
+			local: { name: "JSX" },
+		}).length > 0
+	);
+}
+
+module.exports = scopedJsxTransform;