Add typings for wav-encoder 1.3 (#37727)

types/wav-encoder/index.d.ts

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+// Type definitions for wav-encoder 1.3
+// Project: https://github.com/mohayonao/wav-encoder/
+// Definitions by: Candid Dauth <https://github.com/cdauth>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare namespace WavEncoder {
+    interface AudioData {
+        sampleRate: number;
+        channelData: Float32Array[];
+    }
+
+    interface Options {
+        bitDepth: number;
+        float: boolean;
+        symmetric: boolean;
+    }
+}
+
+declare const WavEncoder: {
+    encode: {
+        (audioData: WavEncoder.AudioData, opts?: WavEncoder.Options): Promise<ArrayBuffer>;
+        sync: (audioData: WavEncoder.AudioData, opts?: WavEncoder.Options) => ArrayBuffer;
+    }
+};
+
+export = WavEncoder;

types/wav-encoder/tsconfig.json

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

types/wav-encoder/tslint.json

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

types/wav-encoder/wav-encoder-tests.ts

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+import WavEncoder = require('wav-encoder');
+
+const left = new Float32Array(10);
+const right = new Float32Array(10);
+
+function encode(): Promise<ArrayBuffer> {
+    return WavEncoder.encode({
+        sampleRate: 44100,
+        channelData: [
+            left,
+            right
+        ]
+    });
+}
+
+function encodeSync(): ArrayBuffer {
+    return WavEncoder.encode.sync({
+        sampleRate: 44100,
+        channelData: [
+            left,
+            right
+        ]
+    });
+}