Use underscore for unused variables

Author: wonjunior

.eslintrc.js

@@ -13,6 +13,7 @@ module.exports = {
 	},
 	rules: {
 	  'semi': ['error', 'never'],
+	  '@typescript-eslint/no-unused-vars': ['warn', { 'argsIgnorePattern': '^_', 'varsIgnorePattern': '^_' }],
 	},
 	ignorePatterns: [ "dist/*" ],
 }