diff --git a/.eslintignore b/.eslintignore
index f210f48..eb3c474 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -2,3 +2,4 @@ dist/
 lib/
 coverage/*
 test/fixtures/**/*.js
+src/SpurErrors.d.ts
diff --git a/src/SpurErrors.d.ts b/src/SpurErrors.d.ts
new file mode 100644
index 0000000..979d6ec
--- /dev/null
+++ b/src/SpurErrors.d.ts
@@ -0,0 +1,41 @@
+export type SpurErrorCode = 400 | 401 | 403 | 404 | 405 | 408 | 409 | 500 | 502 | 503 | 504;
+
+export interface BaseError<TErrorCode extends SpurErrorCode | undefined = undefined> {
+  create(message: string, internalError?: Error): this;
+  extend(statusCode: number, defaultMessage: string, errorCode: string): this;
+  set internalError(internalError: Error);
+  setErrorCode(errorCode: string): this;
+  setMessage(message: string): this;
+  setStatusCode(statusCode: number): this;
+  setData(data: unknown): this;
+
+  errorCode: TErrorCode;
+}
+
+interface SpurErrors {
+  BaseError: BaseError;
+
+  ValidationError: BaseError<400>;
+  UnauthorizedError: BaseError<401>;
+  ForbiddenError: BaseError<403>;
+  NotFoundError: BaseError<404>;
+  MethodNotAllowedError: BaseError<405>;
+  RequestTimeoutError: BaseError<408>;
+  AlreadyExistsError: BaseError<409>;
+  InternalServerError: BaseError<500>;
+  BadGatewayError: BaseError<502>;
+  ServiceUnavailableError: BaseError<503>;
+  GatewayTimeoutError: BaseError<504>;
+
+  errorByStatusCode: <TErrorCode extends SpurErrorCode>(statusCode: TErrorCode) => CodedError<TErrorCode>;
+}
+
+type CodedErrors = {
+  [P in keyof SpurErrors as SpurErrors[P] extends BaseError<infer TErrorCode> ? `${TErrorCode}` : never]: SpurErrors[P];
+};
+
+type CodedError<TErrorCode extends SpurErrorCode> = CodedErrors[`${TErrorCode}`];
+
+declare const SpurErrors: SpurErrors;
+
+export default SpurErrors;