diff --git a/types/webassembly-js-api/index.d.ts b/types/webassembly-js-api/index.d.ts
new file mode 100644
index 0000000000..4e7b0d52bf
--- /dev/null
+++ b/types/webassembly-js-api/index.d.ts
@@ -0,0 +1,107 @@
+// Type definitions for WebAssembly v1 (MVP)
+// Project: https://github.com/winksaville/test-webassembly-js-ts
+// Definitions by: 01alchemist <https://twitter.com/01alchemist>, Wink Saville <wink@saville.com>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * The WebAssembly namespace, see [WebAssembly](https://github.com/webassembly)
+ * and [WebAssembly JS API](http://webassembly.org/getting-started/js-api/)
+ * for more information.
+ */
+declare namespace WebAssembly {
+    /**
+     * WebAssembly.Module
+     */
+    class Module {
+        constructor(bufferSource: ArrayBuffer | Uint8Array);
+        static customSections(module: Module, sectionName: string): ArrayBuffer[];
+        static exports(module: Module): Array<{
+            name: string;
+            kind: string;
+        }>;
+        static imports(module: Module): Array<{
+            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): (args: any[]) => any;
+        grow(numElements: number): number;
+        set(index: number, value: (args: any[]) => any): 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 | Uint8Array): Promise<Module>;
+
+    interface ResultObject {
+        module: Module;
+        instance: Instance;
+    }
+
+    function instantiate(bufferSource: ArrayBuffer | Uint8Array, importObject?: any): Promise<ResultObject>;
+    function instantiate(module: Module, importObject?: any): Promise<Instance>;
+
+    function validate(bufferSource: ArrayBuffer | Uint8Array): boolean;
+}
diff --git a/types/webassembly-js-api/tsconfig.json b/types/webassembly-js-api/tsconfig.json
new file mode 100644
index 0000000000..581bbbdf29
--- /dev/null
+++ b/types/webassembly-js-api/tsconfig.json
@@ -0,0 +1,22 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "webassembly-js-api-tests.ts"
+    ]
+}
diff --git a/types/webassembly-js-api/tslint.json b/types/webassembly-js-api/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/types/webassembly-js-api/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }
diff --git a/types/webassembly-js-api/webassembly-js-api-tests.ts b/types/webassembly-js-api/webassembly-js-api-tests.ts
new file mode 100644
index 0000000000..5b62354070
--- /dev/null
+++ b/types/webassembly-js-api/webassembly-js-api-tests.ts
@@ -0,0 +1,75 @@
+function debug(s: string) {
+  // debug(s)
+}
+
+// Table
+let table = new WebAssembly.Table({element: "anyfunc", initial: 1, maximum: 10});
+debug(`table.length=${table.length}`);
+debug(`table.get(0)=${table.get(0)}`);
+table.grow(1);
+
+// Memory
+let memory = new WebAssembly.Memory({initial: 2, maximum: 8});
+debug(`memory.grow(6)=${memory.grow(6)}`);
+let u8 = new Uint8Array(memory.buffer);
+u8[0] = 1;
+u8[1] = 2;
+debug(`u8[0]=${u8[0]}`);
+debug(`u8[1]=${u8[1]}`);
+
+let wasmDataU8 = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7]);
+debug(`wasmDataU8.length=${wasmDataU8.length}`);
+debug(`wasmDataU8[0]=${wasmDataU8[0].toString(16)}`);
+debug(`wasmDataU8[1]=${wasmDataU8[1].toString(16)}`);
+debug(`wasmDataU8[2]=${wasmDataU8[2].toString(16)}`);
+debug(`wasmDataU8[3]=${wasmDataU8[3].toString(16)}`);
+debug(`wasmDataU8[4]=${wasmDataU8[4].toString(16)}`);
+debug(`wasmDataU8[5]=${wasmDataU8[5].toString(16)}`);
+debug(`wasmDataU8[6]=${wasmDataU8[6].toString(16)}`);
+debug(`wasmDataU8[7]=${wasmDataU8[7].toString(16)}`);
+
+// Validate
+let valid = WebAssembly.validate(wasmDataU8);
+debug("wasmDataU8 is " + (valid ? "" : "not ") + "a valid wasm wasmModule");
+
+// Module
+let wasmModule = new WebAssembly.Module(wasmDataU8);
+debug(`wasmModule=${wasmModule}`);
+
+// CustomSections
+let nameSections = WebAssembly.Module.customSections(wasmModule, "name");
+debug(`Module contains ${nameSections.length} name sections`);
+if (nameSections.length !== 0) {
+    debug("Module contains a name section");
+    debug(nameSections[0].toString());
+}
+
+// Instance
+let instance = new WebAssembly.Instance(wasmModule);
+debug(`instance=${instance}`);
+debug(`instance.exports=${instance.exports}`);
+
+// Compile Asynchronously
+debug("instantiateAsync compile:");
+WebAssembly.compile(wasmDataU8).then((mod: WebAssembly.Module) => {
+    debug(`instantiateAsync compiled: ${JSON.stringify(mod)}`);
+});
+
+// Instantiate
+//   Primary overload — taking wasm binary code
+WebAssembly.instantiate(wasmDataU8).then((result: WebAssembly.ResultObject) => {
+    debug(`Primary overload mod=${result.module}`);
+    debug(`Primary overload inst=${result.instance}`);
+    debug(`Primary exec instance.exports.addTwo1(-1, 1)=${result.instance.exports.addTwo1(-1, 1)}`);
+});
+
+// Instantiate
+//   Secondary overload — taking a Module object
+WebAssembly.instantiate(wasmModule).then((instance: WebAssembly.Instance) => {
+    debug(`Secondary overload instance=${instance}`);
+    debug(`Secondary exec instance.exports.addTwo1(0, -1)=${instance.exports.addTwo1(0, -1)}`);
+});
+
+// Validate
+WebAssembly.validate(new ArrayBuffer(8));
+WebAssembly.validate(wasmDataU8);