diff --git a/types/Chain.d.ts b/types/Chain.d.ts
index 57af254..2ebd5bb 100644
--- a/types/Chain.d.ts
+++ b/types/Chain.d.ts
@@ -12,7 +12,7 @@ export default class Chain {
     };
     apply(options?: {}): SourceMap;
     trace(oneBasedLineIndex: any, zeroBasedColumnIndex: any): any;
-    write(dest: any, options: any): Promise<any>;
+    write(dest: any, options: any): Promise<void[]>;
     writeSync(dest: any, options: any): void;
 }
 import SourceMap from './SourceMap.js';
diff --git a/types/Node.d.ts b/types/Node.d.ts
index cfc983c..8f8a719 100644
--- a/types/Node.d.ts
+++ b/types/Node.d.ts
@@ -21,7 +21,7 @@ export default class Node {
         tracingTime: number;
         untraceable: number;
     };
-    load(sourcesContentByPath: any, sourceMapByPath: any): any;
+    load(sourcesContentByPath: any, sourceMapByPath: any): Promise<any>;
     loadSync(sourcesContentByPath: any, sourceMapByPath: any): void;
     /**
      * Traces a segment back to its origin
diff --git a/types/index.d.ts b/types/index.d.ts
index 8cff109..c9a41f2 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -9,7 +9,7 @@
 export function load(file: string, options: {
     content?: Record<string, string>;
     sourcemaps?: Record<string, any>;
-}): any;
+}): Promise<Chain>;
 /**
  * @param {string} file
  * @param {{