1 files changed, 56 insertions, 0 deletions
diff --git a/@linaria/packages/babel/src/evaluators/visitors/JSXElement.ts b/@linaria/packages/babel/src/evaluators/visitors/JSXElement.ts
new file mode 100644
index 0000000..89a0ccd
--- /dev/null
+++ b/@linaria/packages/babel/src/evaluators/visitors/JSXElement.ts
@@ -0,0 +1,56 @@
+import { types as t } from '@babel/core';
+import type { NodePath } from '@babel/traverse';
+import type { Function, JSXElement as JSXElementNode } from '@babel/types';
+
+function getFunctionName(path: NodePath<Function>): string | null {
+  if (path.isClassMethod() && t.isIdentifier(path.node.key)) {
+    return path.node.key.name;
+  }
+
+  return null;
+}
+
+export default function JSXElement(path: NodePath<JSXElementNode>) {
+  // JSX can be safely replaced on an empty fragment because it is unnecessary for styles
+  const emptyFragment = t.jsxFragment(
+    t.jsxOpeningFragment(),
+    t.jsxClosingFragment(),
+    []
+  );
+
+  // We can do even more
+  // If that JSX is a result of a function, we can replace the function body.
+  const scopePath = path.scope.path;
+  if (scopePath.isFunction()) {
+    const emptyBody = t.blockStatement([t.returnStatement(emptyFragment)]);
+
+    // Is it not just a function, but a method `render`?
+    if (getFunctionName(scopePath) === 'render') {
+      const decl = scopePath.findParent((p) => p.isClassDeclaration());
+
+      // Replace the whole component
+      if (decl?.isClassDeclaration()) {
+        decl.replaceWith(t.functionDeclaration(decl.node.id, [], emptyBody));
+
+        return;
+      }
+    }
+
+    const body = scopePath.get('body');
+    if (Array.isArray(body)) {
+      throw new Error(
+        `A body of a function is expected to be a single element but an array was returned. It's possible if JS syntax has been changed since that code was written.`
+      );
+    }
+
+    const node: typeof scopePath.node = {
+      ...scopePath.node,
+      body: emptyBody,
+      params: [],
+    };
+
+    scopePath.replaceWith(node);
+  } else {
+    path.replaceWith(emptyFragment);
+  }
+}