typings: provide internal types for wasi bindings

PR-URL: #54119
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>

Author: RulerOfCakes

typings/globals.d.ts

@@ -15,6 +15,7 @@ import { TimersBinding } from './internalBinding/timers';
 import { TypesBinding } from './internalBinding/types';
 import { URLBinding } from './internalBinding/url';
 import { UtilBinding } from './internalBinding/util';
+import { WASIBinding } from './internalBinding/wasi';
 import { WorkerBinding } from './internalBinding/worker';
 import { ModulesBinding } from './internalBinding/modules';
 
@@ -50,6 +51,7 @@ interface InternalBindingMap {
   types: TypesBinding;
   url: URLBinding;
   util: UtilBinding;
+  wasi: WASIBinding;
   worker: WorkerBinding;
 }
 

typings/internalBinding/wasi.d.ts

@@ -0,0 +1,14 @@
+declare namespace InternalWASIBinding {
+  type EnvStr = `${string}=${string}`
+
+  class WASI {
+    constructor(args: string[], env: EnvStr[], preopens: string[], stdio: [stdin: number, stdout: number, stderr: number])
+
+    _setMemory(memory: WebAssembly.Memory): void;
+  }
+}
+
+export interface WASIBinding {
+  WASI: typeof InternalWASIBinding.WASI;
+}
+