fixed some lint issues

changed @ts-ignore lint error to warning
tidied up some package scripts
added sanity test for dist package

Author: lvl99

.eslintignore

@@ -0,0 +1,3 @@
+node_modules
+coverage
+.vscode

.eslintrc.json

@@ -11,7 +11,8 @@
       "plugins": ["@typescript-eslint"],
       "rules": {
         "@typescript-eslint/no-explicit-any": 0,
-        "@typescript-eslint/no-use-before-define": 0
+        "@typescript-eslint/no-use-before-define": 0,
+        "@typescript-eslint/ban-ts-comment": "warn"
       },
       "parser": "@typescript-eslint/parser",
       "parserOptions": {

__tests__/sanity.test.js

@@ -0,0 +1,5 @@
+const barbell = require("../dist/index");
+
+it("should work as commonjs module", () => {
+  expect(barbell).toHaveProperty("default");
+});