[@types/imagemin] Add type definitions

types/imagemin/imagemin-tests.ts

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+import * as Imagemin from 'imagemin';
+
+const input = ['fileA.jpg', 'fileB.png'];
+const output = 'output';
+const options = { plugins: [] };
+
+Imagemin(input);
+Imagemin(input, output);
+Imagemin(input, options);
+Imagemin(input, output, options);

types/imagemin/index.d.ts

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+// Type definitions for imagemin 6.0
+// Project: https://github.com/imagemin/imagemin#readme
+// Definitions by: Romain Faust <https://github.com/romain-faust>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+declare function imagemin(input: string[], outputOrOptions?: string | imagemin.Options, options?: imagemin.Options): Promise<imagemin.Result[]>;
+
+declare namespace imagemin {
+    function buffer(buffer: Buffer, options?: Options): Promise<Buffer>;
+
+    type Plugin = (input: Buffer) => Promise<Buffer>;
+
+    interface Options {
+        plugins: Plugin[];
+    }
+
+    interface Result {
+        data: Buffer;
+        path: string;
+    }
+}
+
+export = imagemin;

types/imagemin/tsconfig.json

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

types/imagemin/tslint.json

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