diff --git a/node-file-trace.d.ts b/node-file-trace.d.ts
index c18d8336..ee4623c8 100644
--- a/node-file-trace.d.ts
+++ b/node-file-trace.d.ts
@@ -1,14 +1,58 @@
-interface NodeFileTraceOptions {
+interface Stats {
+  isFile(): boolean;
+  isDirectory(): boolean;
+  isBlockDevice(): boolean;
+  isCharacterDevice(): boolean;
+  isSymbolicLink(): boolean;
+  isFIFO(): boolean;
+  isSocket(): boolean;
+  dev: number;
+  ino: number;
+  mode: number;
+  nlink: number;
+  uid: number;
+  gid: number;
+  rdev: number;
+  size: number;
+  blksize: number;
+  blocks: number;
+  atimeMs: number;
+  mtimeMs: number;
+  ctimeMs: number;
+  birthtimeMs: number;
+  atime: Date;
+  mtime: Date;
+  ctime: Date;
+  birthtime: Date;
+}
+
+export interface NodeFileTraceOptions {
   base?: string;
   ignore?: string | string[] | ((path: string) => boolean);
   ts?: boolean;
   log?: boolean;
   mixedModules?: boolean;
   readFile?: (path: string) => Buffer | string | null;
-  stat?: (path: string) => Object | null;
+  stat?: (path: string) => Stats | null;
   readlink?: (path: string) => string | null;
 }
 
-declare function NodeFileTrace (files: string[], opts: NodeFileTraceOptions): Promise<{ fileList: string[], esmFileList: string[] }>;
+export interface NodeFileTraceReasons {
+  [fileName: string]: {
+    type: string;
+    ignored: boolean;
+    parents: string[];
+  };
+}
+
+export interface NodeFileTraceResult {
+  fileList: string[];
+  esmFileList: string[];
+  reasons: NodeFileTraceReasons;
+  warnings: Error[];
+}
 
-export = NodeFileTrace;
+export default function NodeFileTrace(
+  files: string[],
+  opts: NodeFileTraceOptions
+): Promise<NodeFileTraceResult>;