Fix various linter errors

src/logs.js

@@ -43,7 +43,7 @@ class LogStream extends TransformStream {
 
     _transform(chunk, encoding, callback) {
         const data = this._soFar + this._decoder.write(chunk);
-        let start = this._soFar.length, end = -1;
+        let start = this._soFar.length, end;
         while ((end = data.indexOf('\n', start)) !== -1) {
             const line = data.slice(start, end); // does not include end
             this.push(this._format(line));