add some missing types for validation

declarations.d.ts

@@ -110,7 +110,7 @@ declare module "@webassemblyjs/ast" {
 			Start?: (p: NodePath<Start>) => void;
 			Global?: (p: NodePath<Global>) => void;
 		}
-	);
+	): void;
 	export class NodePath<T> {
 		node: T;
 	}
@@ -121,14 +121,15 @@ declare module "@webassemblyjs/ast" {
 	export class Start extends Node {
 		index: Identifier;
 	}
+	export class ModuleImportDescription {
+		type: string;
+		valtype?: string;
+		id?: Identifier;
+		signature?: Signature;
+	}
 	export class ModuleImport extends Node {
 		module: string;
-		descr: {
-			type: string;
-			valtype?: string;
-			id?: Identifier;
-			signature?: Signature;
-		};
+		descr: ModuleImportDescription;
 		name: string;
 	}
 	export class ModuleExport extends Node {

lib/Module.js

@@ -262,6 +262,10 @@ class Module extends DependenciesBlock {
 		}
 	}
 
+	/**
+	 * @param {string=} exportName the name of the export
+	 * @returns {boolean|string} false if the export isn't used, true if no exportName is provided and the module is used, or the name to access it if the export is used
+	 */
 	isUsed(exportName) {
 		if (!exportName) return this.used !== false;
 		if (this.used === null || this.usedExports === null) return exportName;

lib/dependencies/WebAssemblyImportDependency.js

@@ -8,12 +8,20 @@ const DependencyReference = require("./DependencyReference");
 const ModuleDependency = require("./ModuleDependency");
 const UnsupportedWebAssemblyFeatureError = require("../wasm/UnsupportedWebAssemblyFeatureError");
 
+/** @typedef {import("@webassemblyjs/ast").ModuleImportDescription} ModuleImportDescription */
+
 class WebAssemblyImportDependency extends ModuleDependency {
+	/**
+	 * @param {string} request the request
+	 * @param {string} name the imported name
+	 * @param {ModuleImportDescription} description the WASM ast node
+	 * @param {false | string} onlyDirectImport if only direct imports are allowed
+	 */
 	constructor(request, name, description, onlyDirectImport) {
 		super(request);
 		/** @type {string} */
 		this.name = name;
-		/** @type {TODO} */
+		/** @type {ModuleImportDescription} */
 		this.description = description;
 		/** @type {false | string} */
 		this.onlyDirectImport = onlyDirectImport;