Show additional data in debug log header

ts/logging/shared.ts

@@ -2,10 +2,34 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import * as pino from 'pino';
+import { isRecord } from '../util/isRecord';
 import { redactAll } from '../util/privacy';
 import { missingCaseError } from '../util/missingCaseError';
 import { reallyJsonStringify } from '../util/reallyJsonStringify';
 
+export type FetchLogIpcData = {
+  capabilities: Record<string, unknown>;
+  remoteConfig: Record<string, unknown>;
+  statistics: Record<string, unknown>;
+  user: Record<string, unknown>;
+
+  // We expect `logEntries` to be `Array<LogEntryType>`, but we don't validate that
+  //   upfront—we only validate it when we go to log each line. This improves the
+  //   performance, because we don't have to iterate over every single log entry twice. It
+  //   also means we can log entries if only some of them are invalid.
+  logEntries: Array<unknown>;
+};
+
+// We don't use Zod here because it'd be slow parsing all of the log entries.
+//   Unfortunately, Zod is a bit slow even with `z.array(z.unknown())`.
+export const isFetchLogIpcData = (data: unknown): data is FetchLogIpcData =>
+  isRecord(data) &&
+  isRecord(data.capabilities) &&
+  isRecord(data.remoteConfig) &&
+  isRecord(data.statistics) &&
+  isRecord(data.user) &&
+  Array.isArray(data.logEntries);
+
 // These match [Pino's recommendations][0].
 // [0]: https://getpino.io/#/docs/api?id=loggerlevels-object
 export enum LogLevel {
@@ -29,7 +53,7 @@ export type LogEntryType = Readonly<{
 // whenever we want to send the debug log. We can't use `zod` because it clones
 // the data on successful parse and ruins the performance.
 export const isLogEntry = (data: unknown): data is LogEntryType => {
-  if (data === null || typeof data !== 'object') {
+  if (!isRecord(data)) {
     return false;
   }