Updated the files.

my-app/node_modules/@sigstore/sign/dist/signer/signer.d.ts

@@ -0,0 +1,16 @@
+/// <reference types="node" />
+export type KeyMaterial = {
+    $case: 'x509Certificate';
+    certificate: string;
+} | {
+    $case: 'publicKey';
+    publicKey: string;
+    hint?: string;
+};
+export type Signature = {
+    signature: Buffer;
+    key: KeyMaterial;
+};
+export interface Signer {
+    sign: (data: Buffer) => Promise<Signature>;
+}