[@types/gulp-imagemin] Add type definitions (#27692)

* Add koa-router's Router to koa's Context

* [@types/gulp-imagemin] Add type definitions

types/gulp-imagemin/gulp-imagemin-tests.ts

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+import * as GulpImagemin from 'gulp-imagemin';
+
+GulpImagemin();
+
+GulpImagemin([
+    GulpImagemin.gifsicle({ interlaced: true }),
+    GulpImagemin.jpegtran({ progressive: true }),
+    GulpImagemin.optipng({ optimizationLevel: 5 }),
+    GulpImagemin.svgo({
+        plugins: [{ removeViewBox: true }, { cleanupIDs: false }]
+    })
+]);
+
+GulpImagemin({ verbose: true });
+
+GulpImagemin([
+    GulpImagemin.svgo({
+        plugins: [{ removeViewBox: true }]
+    })
+], { verbose: true });

types/gulp-imagemin/index.d.ts

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+// Type definitions for gulp-imagemin 4.1
+// Project: https://github.com/sindresorhus/gulp-imagemin#readme
+// Definitions by: Romain Faust <https://github.com/romain-faust>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+import { Transform } from 'stream';
+
+declare function imagemin(pluginsOrOptions?: imagemin.Plugin[] | imagemin.Options): Transform;
+declare function imagemin(plugins?: imagemin.Plugin[], options?: imagemin.Options): Transform;
+
+declare namespace imagemin {
+    interface Options {
+        verbose?: boolean;
+    }
+
+    type Plugin = (input: any) => Promise<any>;
+    type PluginFactory = (options?: any) => Plugin;
+
+    const gifsicle: PluginFactory;
+    const jpegtran: PluginFactory;
+    const optipng: PluginFactory;
+    const svgo: PluginFactory;
+}
+
+export = imagemin;

types/gulp-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",
+        "gulp-imagemin-tests.ts"
+    ]
+}

types/gulp-imagemin/tslint.json

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