Types for imagemin-pngquant (#35068)

* clear to tests

* clear to tests

* clear to tests

* tslint passed

types/imagemin-pngquant/imagemin-pngquant-tests.ts

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+import imagemin = require('imagemin');
+import imageminPngquant = require('imagemin-pngquant');
+
+imagemin(['*.png'], {
+    plugins: [
+        imageminPngquant(),
+        imageminPngquant({
+            speed: 11,
+            strip: true,
+            quality: [0.4, 0.5],
+            dithering: 0,
+            posterize: 1,
+            verbose: true
+        })
+    ]
+});

types/imagemin-pngquant/index.d.ts

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+// Type definitions for imagemin-pngquant 7.0
+// Project: https://github.com/imagemin/imagemin-pngquant
+// Definitions by: Takesi Tokugawa <https://github.com/TokugawaTakesi>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+import { Plugin } from 'imagemin';
+import { Stream } from 'stream';
+
+declare function imageminPngquant(options?: ImageminPngquant.Options): Plugin;
+
+declare namespace ImageminPngquant {
+    interface Options {
+        speed?: number;
+        strip?: boolean;
+        quality?: [number, number];
+        dithering?: number | boolean;
+        posterize?: number;
+        verbose?: boolean;
+        input?: Buffer | Stream;
+    }
+}
+
+export = imageminPngquant;

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

types/imagemin-pngquant/tslint.json

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