add typings for node-gzip (#36560)

types/node-gzip/index.d.ts

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+// Type definitions for node-gzip 1.1
+// Project: https://github.com/Rebsos/node-gzip#readme
+// Definitions by: mike castleman <https://github.com/mlc>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+// TypeScript Version: 2.1
+
+/// <reference types="node" />
+
+import { InputType, ZlibOptions } from 'zlib';
+
+export function gzip(input: InputType, options?: ZlibOptions): Promise<Buffer>;
+export function ungzip(input: InputType, options?: ZlibOptions): Promise<Buffer>;

types/node-gzip/node-gzip-tests.ts

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+import { gzip, ungzip } from 'node-gzip';
+
+const testGzip = async () => {
+    const someBuffer = Buffer.from('hello');
+    const zipped1 = await gzip(someBuffer);
+
+    const zipped2 = await gzip('gzipping a string directly');
+
+    return [zipped1.byteLength, zipped2[0]];
+};
+
+const testUngzip = async () => {
+    const data = Buffer.from('H4sICHeEGV0AA2EA4wIAkwbXMgEAAAA=', 'base64');
+    const ungzipped = await ungzip(data);
+    return ungzipped.toString('utf-8');
+};

types/node-gzip/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",
+        "node-gzip-tests.ts"
+    ]
+}

types/node-gzip/tslint.json

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