diff --git a/browser-async.d.ts b/browser-async.d.ts
index a5a04ce572f3c4540131331a04c97f45d5a83aec..6487148089fabdc490b38e4c8b1fa18fd948abc3 100644
--- a/browser-async.d.ts
+++ b/browser-async.d.ts
@@ -4,4 +4,4 @@ import * as blake3 from './esm/browser';
  * Manually loads the WebAssembly module, returning a promise that resolves
  * to the BLAKE3 implementation once available.
  */
-export default function load(module: string | URL | Request | object): Promise<typeof blake3>;
+export default function load(module: string | URL | Request | object | ((imports: unknown) => Promise<WebAssembly.Module>)): Promise<typeof blake3>;
diff --git a/dist/wasm/web/blake3_js.d.ts b/dist/wasm/web/blake3_js.d.ts
index cd566ed3396cb5c5e591b3f6206c032bfa80ace6..a892506a5b9b7d73750b6e193c692d843615af70 100644
--- a/dist/wasm/web/blake3_js.d.ts
+++ b/dist/wasm/web/blake3_js.d.ts
@@ -50,7 +50,7 @@ export class HashReader {
   set_position(position: BigInt): void;
 }
 
-export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
+export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module | ((imports: unknown) => Promise<WebAssembly.Module>);
 
 export interface InitOutput {
   readonly memory: WebAssembly.Memory;
diff --git a/dist/wasm/web/blake3_js.js b/dist/wasm/web/blake3_js.js
index 4fa37747aa8b61fa8f29736871ec2c8d38ffcb3d..afa8d13e1d55092aa68d6867ca99238f519ec6b5 100644
--- a/dist/wasm/web/blake3_js.js
+++ b/dist/wasm/web/blake3_js.js
@@ -261,7 +261,15 @@ async function init(input) {
         input = fetch(input);
     }
 
-    const { instance, module } = await load(await input, imports);
+    let result;
+
+    if (typeof input === 'function') {
+        result = await input(imports);
+    } else {
+        result = await load(await input, imports);
+    }
+
+    const { instance, module } = result;
 
     wasm = instance.exports;
     init.__wbindgen_wasm_module = module;