diff --git a/.eslintignore b/.eslintignore
index d12992c..e8e690f 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -12,3 +12,4 @@ typings/
 dist
 .idea/
 .vscode/
+index.d.ts
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..fa10106
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,17 @@
+export = EError
+
+declare class EError extends Error {
+  [prop: string]: unknown;
+
+  public combine(fields: Record<string, unknown>): EError
+  public wrap<TError extends Partial<Error>>(error: TError): TError & { [prop: string]: unknown }
+
+  public static wrap<TError extends Partial<Error>>(error: TError, fields: Record<string, unknown>): TError & { [prop: string]: unknown }
+
+  public static prepare(baseClass: EErrorClass, fields: Record<string, unknown>): EErrorClass
+  public static prepare(fields: Record<string, unknown>): EErrorClass
+}
+
+declare interface EErrorClass {
+  new (message?: string): EError;
+}