Small improvements

frontend/deterministic-tests/src/cli.ts

@@ -42,7 +42,7 @@ function testUsesPauseServer(test: TestDefinition): boolean {
  */
 function findProjectRoot(): string {
     let dir = path.dirname(__filename);
-    const root = path.parse(dir).root;
+    const {root} = path.parse(dir);
     while (dir !== root) {
         if (
             fs.existsSync(path.join(dir, "sync-server")) &&

frontend/deterministic-tests/src/deterministic-agent.ts

@@ -304,7 +304,7 @@ export class DeterministicAgent extends debugging.InMemoryFileSystem {
             });
         }
 
-        const nextWriteRename = this.nextWriteRename;
+        const { nextWriteRename } = this;
         if (
             nextWriteRename !== undefined &&
             nextWriteRename.oldPath === path

frontend/deterministic-tests/src/server-control.ts

@@ -239,8 +239,7 @@ export class ServerControl {
     public isRunning(): boolean {
         const proc = this.process;
         return (
-            proc !== null &&
-            proc.pid !== undefined &&
+            proc?.pid !== undefined &&
             proc.exitCode === null &&
             proc.signalCode === null
         );

frontend/deterministic-tests/src/test-runner.ts

@@ -190,7 +190,7 @@ export class TestRunner {
                     (entry) =>
                         entry.details.type === step.syncType &&
                         entry.details.relativePath === step.path,
-                    () => this.serverControl.pause()
+                    () => { this.serverControl.pause(); }
                 );
                 this.serverControl.resume();
                 await historySeen;