add treeshaking tests

local/browser-testing/dist/Select.d.ts

@@ -1,4 +1,3 @@
-/// <reference types="jest" />
 export declare const generateSelectCallback: (targetElms: HTMLElement[] | HTMLElement | null, callback: (targetAffectedElm: HTMLElement, possibleValues: string[], selectedValue: string) => any) => (event: Event | HTMLSelectElement | null) => void;
 export declare const generateClassChangeSelectCallback: (targetElms: HTMLElement[] | HTMLElement | null) => (event: Event | HTMLSelectElement | null) => void;
 export declare const selectOption: (select: HTMLSelectElement | null, selectedOption: string | number) => boolean;

local/browser-testing/tsconfig.json

@@ -2,6 +2,7 @@
   "extends": "@~local/tsconfig",
   "compilerOptions": {
     "outDir": "./dist/",
-    "baseUrl": "./src/"
+    "baseUrl": "./src/",
+    "typeRoots": []
   }
 }