Start with assemblyscript-bson as skeleton

tests/types/webassembly/index.d.ts

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+/**
+ * WebAssembly v1 (MVP) declaration file for TypeScript
+ * Definitions by: 01alchemist (https://twitter.com/01alchemist)
+ */
+declare namespace WebAssembly {
+  /**
+   * WebAssembly.Module
+   **/
+  class Module {
+    constructor(bufferSource: ArrayBuffer | ArrayBufferView<number>);
+
+    static customSections(module: Module, sectionName: string): ArrayBuffer[];
+    static exports(module: Module): { name: string, kind: string }[];
+    static imports(module: Module): { module: string, name: string, kind: string }[];
+  }
+
+  /**
+   * WebAssembly.Instance
+   **/
+  class Instance {
+    readonly exports: any;
+    constructor(module: Module, importObject?: any);
+  }
+
+  /**
+   * WebAssembly.Memory
+   * Note: A WebAssembly page has a constant size of 65,536 bytes, i.e., 64KiB.
+   **/
+  interface MemoryDescriptor {
+    initial: number;
+    maximum?: number;
+  }
+
+  class Memory {
+    readonly buffer: ArrayBuffer;
+    constructor(memoryDescriptor: MemoryDescriptor);
+    grow(numPages: number): number;
+  }
+
+  /**
+   * WebAssembly.Table
+   **/
+  interface TableDescriptor {
+    element: "anyfunc",
+    initial: number;
+    maximum?: number;
+  }
+
+  class Table {
+    readonly length: number;
+    constructor(tableDescriptor: TableDescriptor);
+    get(index: number): Function;
+    grow(numElements: number): number;
+    set(index: number, value: Function): void;
+  }
+
+  /**
+   * Errors
+   */
+  class CompileError extends Error {
+    readonly fileName: string;
+    readonly lineNumber: string;
+    readonly columnNumber: string;
+    constructor(message?: string, fileName?: string, lineNumber?: number);
+    toString(): string;
+  }
+
+  class LinkError extends Error {
+    readonly fileName: string;
+    readonly lineNumber: string;
+    readonly columnNumber: string;
+    constructor(message?: string, fileName?: string, lineNumber?: number);
+    toString(): string;
+  }
+
+  class RuntimeError extends Error {
+    readonly fileName: string;
+    readonly lineNumber: string;
+    readonly columnNumber: string;
+    constructor(message?: string, fileName?: string, lineNumber?: number);
+    toString(): string;
+  }
+
+  function compile(bufferSource: ArrayBuffer | ArrayBufferView<number>): Promise<Module>;
+
+  interface ResultObject {
+    module: Module;
+    instance: Instance;
+  }
+
+  function instantiateStreaming(bufferSource: ArrayBuffer | ArrayBufferView<number>, importObject?: any): Promise<ResultObject>;
+  function instantiate(bufferSource: ArrayBuffer | ArrayBufferView<number>, importObject?: any): Promise<ResultObject>;
+  function instantiate(module: Module, importObject?: any): Promise<Instance>;
+
+  function validate(bufferSource: ArrayBuffer | ArrayBufferView<number>): boolean;
+}

tests/types/webassembly/package.json

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+{
+  "types": "index.d.ts"
+}