Added all the available typings for Imagemin plugins.

package.json

@@ -45,6 +45,10 @@
   },
   "homepage": "https://github.com/Klathmon/imagemin-webpack-plugin#readme",
   "dependencies": {
+    "@types/imagemin-gifsicle": "^5.2.0",
+    "@types/imagemin-jpegtran": "^5.0.0",
+    "@types/imagemin-optipng": "^5.2.0",
+    "@types/imagemin-svgo": "^7.0.0",
     "@types/webpack": "^4.4.24",
     "async-throttle": "^1.1.0",
     "babel-runtime": "^6.18.0",

src/index.d.ts

@@ -1,3 +1,8 @@
+import { Options as GifsicleOptions } from 'imagemin-gifsicle';
+import { Options as JpegTranOptions } from 'imagemin-jpegtran';
+import { Options as OptiPngOptions } from 'imagemin-optipng';
+import { Options as SvgoOptions } from 'imagemin-svgo';
+
 import { Plugin } from 'webpack';
 
 export default ImageminWebpackPugin;
@@ -9,7 +14,7 @@ declare class ImageminWebpackPugin extends Plugin {
 declare namespace ImageminWebpackPugin {
   type TestOption = RegExp | string | (() => boolean);
 
-  // Keeping it as generic object as including all the other types would be too heavy
+  // Generic options for plugins missing typings
   interface ExternalOptions {
     [key: string]: any;
   }
@@ -18,10 +23,10 @@ declare namespace ImageminWebpackPugin {
     disable?: boolean;
     test?: TestOption | TestOption[];
     maxConcurrency?: number;
-    optipng?: ExternalOptions | null;
-    gifsicle?: ExternalOptions | null;
-    jpegtran?: ExternalOptions | null;
-    svgo?: ExternalOptions | null;
+    optipng?: OptiPngOptions | null;
+    gifsicle?: GifsicleOptions | null;
+    jpegtran?: JpegTranOptions | null;
+    svgo?: SvgoOptions | null;
     pngquant?: ExternalOptions | null;
     plugins?: Array<Promise<Buffer>> | [];
   }

yarn.lock

@@ -99,11 +99,52 @@
   resolved "https://registry.yarnpkg.com/@types/anymatch/-/anymatch-1.3.0.tgz#d1d55958d1fccc5527d4aba29fc9c4b942f563ff"
   integrity sha512-7WcbyctkE8GTzogDb0ulRAEw7v8oIS54ft9mQTU7PfM0hp5e+8kpa+HeQ7IQrFbKtJXBKcZ4bh+Em9dTw5L6AQ==
 
+"@types/imagemin-gifsicle@^5.2.0":
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/@types/imagemin-gifsicle/-/imagemin-gifsicle-5.2.0.tgz#349160f17412e26de8d5794e70aad504781ea7d8"
+  integrity sha512-WohEsNMyGYTc+u6WA7KUvX8g+uLgTJOhqteexGdGZ/TPyS65GuCzMJ1RTaSzqG/cIfLFxbxg/HbGBg8YJrNZaw==
+  dependencies:
+    "@types/imagemin" "*"
+
+"@types/imagemin-jpegtran@^5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@types/imagemin-jpegtran/-/imagemin-jpegtran-5.0.0.tgz#44d98874bdcc3f290ce1e158355f33fc90ac2758"
+  integrity sha512-uwJknBgND9Jx+/d5bJf+mvAjfes0NIDyCeOKFJ9LbEYnp8/PVt0YDGh8K96JemeF84VbhHFxnN62Wz68rVNfFQ==
+  dependencies:
+    "@types/imagemin" "*"
+
+"@types/imagemin-optipng@^5.2.0":
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/@types/imagemin-optipng/-/imagemin-optipng-5.2.0.tgz#83046e0695739661fa738ad253bdbf51bc4f9e9d"
+  integrity sha512-Qn4gTV1fpPG2WIsUIl10yi2prudOuDIx+D+O0H3aKZRcTCwpMjszBVeRWUqkhG5wADhWO4giLut1sFNr3H2XIQ==
+  dependencies:
+    "@types/imagemin" "*"
+
+"@types/imagemin-svgo@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@types/imagemin-svgo/-/imagemin-svgo-7.0.0.tgz#c9ffe209ed7695c9ae4bebef083f47de2cd98c1e"
+  integrity sha512-Uq2T4hHE9PvBLB1lZM1+bZUzPc14XCKKWzQqJ47qe4/iuVHavYX4ig/gbBj8W3ZvRAJcQV3nagfoqFUzzdFD4g==
+  dependencies:
+    "@types/imagemin" "*"
+    "@types/svgo" "*"
+
+"@types/imagemin@*":
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/@types/imagemin/-/imagemin-6.0.0.tgz#c7b72bb08657396884acfac735c204379b0fe0a4"
+  integrity sha512-07dAIxWudAi8dHBS7W5JJ1rj4XR+FBLooq1yXXZo2XTv9kbMHKeDjq1pd9ou4Ui6yBZzfezlNxfJM1++fbc5/A==
+  dependencies:
+    "@types/node" "*"
+
 "@types/node@*":
   version "10.12.21"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-10.12.21.tgz#7e8a0c34cf29f4e17a36e9bd0ea72d45ba03908e"
   integrity sha512-CBgLNk4o3XMnqMc0rhb6lc77IwShMEglz05deDcn2lQxyXEZivfwgYJu7SMha9V5XcrP6qZuevTHV/QrN2vjKQ==
 
+"@types/svgo@*":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@types/svgo/-/svgo-1.0.1.tgz#6095fc0119febcf5920ed9cdacdcc0a0d026e4a5"
+  integrity sha512-tV+xgQS8v4McSQqk+tGDCwTT1Bo/QLqgRPS1M9UgNZHK2cTf6CdwzxcMG7YAQwd/ZPUNgfgvN7tfe4OUv077Lw==
+
 "@types/tapable@*":
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/@types/tapable/-/tapable-1.0.4.tgz#b4ffc7dc97b498c969b360a41eee247f82616370"