Added image-thumbnail types (#39086)

* Added image-thumbnail types

* Updated types to use the generator

types/image-thumbnail/image-thumbnail-tests.ts

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+import { createReadStream } from 'fs';
+import imageThumbnail = require('image-thumbnail');
+
+imageThumbnail({ uri: '' }); // $ExpectType Promise<Buffer>
+imageThumbnail({ uri: '' }, { responseType: 'base64' }); // $ExpectType Promise<string>
+
+imageThumbnail(''); // $ExpectType Promise<Buffer>
+imageThumbnail('', { responseType: 'base64' }); // $ExpectType Promise<string>
+
+imageThumbnail(Buffer.from([])); // $ExpectType Promise<Buffer>
+imageThumbnail(Buffer.from([]), { responseType: 'base64' }); // $ExpectType Promise<string>
+
+imageThumbnail(createReadStream('')); // $ExpectType Promise<Buffer>
+imageThumbnail(createReadStream(''), { responseType: 'base64' }); // $ExpectType Promise<string>

types/image-thumbnail/index.d.ts

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+// Type definitions for image-thumbnail 1.0
+// Project: https://github.com/onildoaguiar/image-thumbnail#readme
+// Definitions by: Noam Alffasy <https://github.com/noamalffasy>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+import { ReadStream } from 'fs';
+
+export = imageFunction;
+
+declare function imageFunction(
+    src: { uri: string } | string | Buffer | ReadStream,
+    options?: { responseType: 'buffer' } & imageFunction.Options,
+): Promise<Buffer>;
+declare function imageFunction(
+    src: { uri: string } | string | Buffer | ReadStream,
+    options?: { responseType: 'base64' } & imageFunction.Options,
+): Promise<string>;
+
+declare namespace imageFunction {
+    interface Options {
+        percentage?: number;
+        width?: number;
+        height?: number;
+        responseType?: string;
+    }
+}

types/image-thumbnail/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",
+        "image-thumbnail-tests.ts"
+    ]
+}

types/image-thumbnail/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }