diff --git a/packages/gatsby/src/utils/worker/child.js b/packages/gatsby/src/utils/worker/child.js
deleted file mode 100644
index 25e8bd6469992..0000000000000
--- a/packages/gatsby/src/utils/worker/child.js
+++ /dev/null
@@ -1,8 +0,0 @@
-// Note: this doesn't check for conflicts between module exports
-import { getFilePath } from "./page-data"
-import { renderHTML } from "./render-html"
-
-module.exports = {
-  getFilePath,
-  renderHTML,
-}
diff --git a/packages/gatsby/src/utils/worker/child.ts b/packages/gatsby/src/utils/worker/child.ts
new file mode 100644
index 0000000000000..2bcff0b379e4e
--- /dev/null
+++ b/packages/gatsby/src/utils/worker/child.ts
@@ -0,0 +1,3 @@
+// Note: this doesn't check for conflicts between module exports
+export { getFilePath } from "./page-data"
+export { renderHTML } from "./render-html"