diff --git a/vercel.d.ts b/vercel.d.ts
new file mode 100644
index 00000000..a726c39a
--- /dev/null
+++ b/vercel.d.ts
@@ -0,0 +1,61 @@
+// https://vercel.com/docs/projects/environment-variables/system-environment-variables
+
+declare namespace NodeJS {
+  interface ProcessEnv {
+    readonly VERCEL?: "1";
+    readonly CI?: "1";
+
+    /** @see https://vercel.com/docs/edge-network/regions#region-list */
+    readonly VERCEL_REGION?:
+      | "arn1"
+      | "bom1"
+      | "cdg1"
+      | "cle1"
+      | "cpt1"
+      | "dub1"
+      | "fra1"
+      | "gru1"
+      | "hkg1"
+      | "hnd1"
+      | "iad1"
+      | "icn1"
+      | "kix1"
+      | "lhr1"
+      | "pdx1"
+      | "sfo1"
+      | "sin1"
+      | "syd1"
+      | "dev1";
+
+    readonly VERCEL_ENV?: "production" | "preview" | "development";
+    readonly VERCEL_URL?: string;
+    readonly VERCEL_BRANCH_URL?: string;
+    readonly VERCEL_AUTOMATION_BYPASS_SECRET?: string;
+    readonly VERCEL_GIT_PROVIDER?: string;
+    readonly VERCEL_GIT_REPO_SLUG?: string;
+    readonly VERCEL_GIT_REPO_OWNER?: string;
+    readonly VERCEL_GIT_REPO_ID?: string;
+    readonly VERCEL_GIT_COMMIT_REF?: string;
+    readonly VERCEL_GIT_COMMIT_SHA?: string;
+    readonly VERCEL_GIT_COMMIT_MESSAGE?: string;
+    readonly VERCEL_GIT_COMMIT_AUTHOR_LOGIN?: string;
+    readonly VERCEL_GIT_COMMIT_AUTHOR_NAME?: string;
+    readonly VERCEL_GIT_PREVIOUS_SHA?: string;
+    readonly VERCEL_GIT_PULL_REQUEST_ID?: string;
+
+    readonly NEXT_PUBLIC_VERCEL_ENV?: "production" | "preview" | "development";
+    readonly NEXT_PUBLIC_VERCEL_URL?: string;
+    readonly NEXT_PUBLIC_VERCEL_BRANCH_URL?: string;
+    readonly NEXT_PUBLIC_VERCEL_AUTOMATION_BYPASS_SECRET?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_PROVIDER?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_REPO_SLUG?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_REPO_OWNER?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_REPO_ID?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_REF?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_SHA?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_MESSAGE?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_AUTHOR_LOGIN?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_AUTHOR_NAME?: string;
+    readonly NEXT_PUBLIC_VERCEL_GIT_PULL_REQUEST_ID?: string;
+  }
+}