Enable lint to prevent extra blank lines and fix cases

.eslintrc.json

@@ -57,6 +57,7 @@
     "no-bitwise": "off",
     "no-continue": "off",
     "no-dupe-class-members": "off",
+    "no-multiple-empty-lines": ["error", {"max":  1}],
     "no-plusplus": ["error", {"allowForLoopAfterthoughts": true}],
     "no-restricted-syntax": ["error", "ForInStatement", "LabeledStatement", "WithStatement"],
     "no-unused-vars": "off",
@@ -79,4 +80,4 @@
       }
     }
   ]
-}
+}

src/error.ts

@@ -10,7 +10,6 @@ function extractMessage(error: unknown): string {
     return 'unknown error';
 }
 
-
 export function formatMessage(error: unknown): string {
     const message = extractMessage(error);
 

src/event.ts

@@ -80,7 +80,6 @@ export const pageEventTypes = [
     'pageOpened',
 ] as const;
 
-
 export const tabEventTypes = [
     'tabOpened',
     'tabUrlChanged',

src/sdk.ts

@@ -31,7 +31,6 @@ function validateConfiguration(configuration: unknown): asserts configuration is
     }
 }
 
-
 export default class Sdk {
     private container: Container;