[@types/imagemin-jpegtran] Add type definitions

types/imagemin-jpegtran/imagemin-jpegtran-tests.ts

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+import imagemin = require('imagemin');
+import imageminJpegtran = require('imagemin-jpegtran');
+
+imagemin(['*.png'], {
+    plugins: [
+        imageminJpegtran(),
+        imageminJpegtran({ progressive: true })
+    ]
+});

types/imagemin-jpegtran/index.d.ts

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+// Type definitions for imagemin-jpegtran 5.0
+// Project: https://github.com/imagemin/imagemin-jpegtran#readme
+// Definitions by: Romain Faust <https://github.com/romain-faust>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import { Plugin } from 'imagemin';
+
+declare function imageminJpegtran(options?: imageminJpegtran.Options): Plugin;
+
+declare namespace imageminJpegtran {
+    interface Options {
+        arithmetic?: boolean;
+        progressive?: boolean;
+    }
+}
+
+export = imageminJpegtran;

types/imagemin-jpegtran/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-jpegtran-tests.ts"
+    ]
+}

types/imagemin-jpegtran/tslint.json

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