--json prints only JSON on stdout (withJsonOutput around every command: logs, tables and prompts to stderr; printJson everywhere; test runs every --json command against the fake stores and parses stdout); prices ppp compares like with like: par = the store's own US-equivalent price (Play convertRegionPrices, Apple equalizations; offline base x fx x (1 + VAT) rounded up) scaled by the PPP price level; defaults only lower, only price levels <= 0.5, World Bank high-income at par, CN at par on Apple and skipped on Play, never above par (--only-decreases, --max-ratio, --min-ratio, --max-level, --include-high-income; --floor / --ceiling kept), top-10 revenue market drops > 20 % warned (sales reports, else a static list), unchanged regions out of the sheet; price changes of existing products only with --allow-price-changes, TTY or not (a terminal yes covered them), then their own question listing each old -> new, held section in dry runs (play products, prices import, play / apple subscriptions); pitfalls 61-63; tests

cli/lib/ctx.ts

@@ -3,6 +3,7 @@ import type { Language, Loaded } from './config';
 import { playCodes } from './config';
 import * as rt from './rt';
 import { stdinIsTTY } from './tty';
+import { promptOut } from './log';
 
 export interface Ctx { loaded: Loaded; args: Args }
 
@@ -43,7 +44,7 @@ export async function confirm(ctx: Ctx, question: string): Promise<boolean> {
     console.log(`${question}\n  not a terminal: re-run with --yes to confirm`);
     return declined('not a terminal and no --yes (re-run with --yes to confirm)');
   }
-  process.stdout.write(`${question} [y/N] `);
+  promptOut().write(`${question} [y/N] `);
   const line = await rt.readLine();
   return line !== null && /^y(es)?$/i.test(line.trim()) || declined(line === null ? 'no answer (stdin closed)' : 'the owner answered no');
 }