[kissfft-js]: add type declarations for kissfft-js

types/kissfft-js/index.d.ts

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+// Type definitions for kissfft-js 0.1
+// Project: https://github.com/j-funk/kissfft-js#readme
+// Definitions by: racerhere <https://github.com/racerhere>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped/types/kissfft-js
+
+declare abstract class AbstractKissFFT {
+    constructor(size: number);
+    forward(input: number[]): number[];
+    inverse(input: number[]): number[];
+    dispose(): void;
+}
+
+export class FFT extends AbstractKissFFT {
+}
+
+export class FFTR extends AbstractKissFFT {
+}

types/kissfft-js/kissfft-js-tests.ts

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+import {FFT} from "kissfft-js";
+import {FFTR} from "kissfft-js";
+
+const fft = new FFT(0); // $ExpectType FFT
+fft.forward([1, 2, 3]); // $ExpectType number[]
+fft.inverse([1, 2, 3]); // $ExpectType number[]
+fft.dispose(); // $ExpectType void
+
+const fftr = new FFTR(0); // $ExpectType FFTR
+fftr.forward([1, 2, 3]); // $ExpectType number[]
+fftr.inverse([1, 2, 3]); // $ExpectType number[]
+fftr.dispose(); // $ExpectType void

types/kissfft-js/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "kissfft-js-tests.ts"
+    ]
+}

types/kissfft-js/tslint.json

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+{ "extends": "dtslint/dt.json" }