[next] improve tree shaking + update webpack & babel (#2132)

* feat: improve tree shaking + update webpack & babel

* fix: tests

src/types/terser-webpack-plugin.d.ts

@@ -0,0 +1,44 @@
+declare module "terser-webpack-plugin" {
+  import { Plugin } from "webpack";
+
+  export default class TerserPlugin extends Plugin {
+    constructor(options?: TerserPluginOptions);
+  }
+
+  export interface TerserPluginOptions {
+    test?: RegExp | RegExp[];
+    include?: RegExp | RegExp[];
+    exclude?: RegExp | RegExp[];
+    cache?: boolean | string;
+    parallel?: boolean | number;
+    sourceMap?: boolean;
+    terserOptions?: TerserOptions;
+    extractComments?:
+      | boolean
+      | RegExp
+      | ((node: object, comment: string) => boolean)
+      | ExtractCommentsOptions;
+    warningsFilter?: (source: string) => boolean;
+  }
+
+  export interface TerserOptions {
+    ie8?: boolean;
+    ecma?: number;
+    parse?: object;
+    mangle?: boolean | object;
+    output?: object;
+    compress?: boolean | object;
+    warnings?: boolean;
+    toplevel?: boolean;
+    nameCache?: object;
+    keep_classnames?: boolean;
+    keep_fnames?: boolean;
+    safari10?: boolean;
+  }
+
+  export interface ExtractCommentsOptions {
+    condition?: RegExp | ((node: object, comment: string) => boolean);
+    filename?: string | ((originalFileName: string) => string);
+    banner?: boolean | string | ((fileName: string) => string);
+  }
+}

src/types/webpack-deep-scope-plugin.d.ts

@@ -0,0 +1 @@
+declare module "webpack-deep-scope-plugin";