refactor(v2): convert @docusaurus/plugin-ideal-image to TypeScript (#2011)

* refactor @docusaurus/plugin-ideal-image
refactor @docusaurus/plugin-ideal-image

* Update react-ideal-image.d.ts

* Update types.ts

* Update IdealImage.tsx

* Update package.json

packages/docusaurus-plugin-ideal-image/src/index.ts

@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+import {LoadContext} from '@docusaurus/types';
+import {PluginOptions} from './types';
+import {Configuration} from 'webpack';
+
+import path from 'path';
+
+export = function(_context: LoadContext, options: PluginOptions) {
+  const isProd = process.env.NODE_ENV === 'production';
+  return {
+    name: 'docusaurus-plugin-ideal-image',
+
+    getThemePath() {
+      return path.resolve(__dirname, './theme');
+    },
+
+    configureWebpack(_config: Configuration, isServer: boolean) {
+      return {
+        module: {
+          rules: [
+            {
+              test: /\.(png|jpe?g|gif)$/i,
+              use: [
+                '@endiliey/lqip-loader',
+                {
+                  loader: '@endiliey/responsive-loader',
+                  options: {
+                    emitFile: !isServer, // don't emit for server-side rendering
+                    disable: !isProd,
+                    // eslint-disable-next-line
+                    adapter: require('@endiliey/responsive-loader/sharp'),
+                    name: isProd
+                      ? 'ideal-img/[name].[hash:hex:7].[width].[ext]'
+                      : 'ideal-img/[name].[width].[ext]',
+                    ...options,
+                  },
+                },
+              ],
+            },
+          ],
+        },
+      };
+    },
+  };
+};