1 files changed, 22 insertions, 0 deletions
diff --git a/packages/astro/src/core/polyfill.ts b/packages/astro/src/core/polyfill.ts
new file mode 100644
index 000000000..7b0280fb7
--- /dev/null
+++ b/packages/astro/src/core/polyfill.ts
@@ -0,0 +1,22 @@
+import buffer from 'node:buffer';
+import crypto from 'node:crypto';
+
+/**
+ * Astro aims to compatible with web standards as much as possible.
+ * This function adds two objects that are globally-available on most javascript runtimes but not on node 18.
+ */
+export function apply() {
+	// Remove when Node 18 is dropped for Node 20
+	if (!globalThis.crypto) {
+		Object.defineProperty(globalThis, 'crypto', {
+			value: crypto.webcrypto,
+		});
+	}
+
+	// Remove when Node 18 is dropped for Node 20
+	if (!globalThis.File) {
+		Object.defineProperty(globalThis, 'File', {
+			value: buffer.File,
+		});
+	}
+}