Build hangs / floods terminal with "[ora] Multiple concurrent spinners detected" since v22 (parallel entry-point builds + ora ≥ 9.1) #3447

Since ng-packagr 22, building a library with multiple secondary entry points hangs when stdout is a TTY.
It repeatedly prints:

[ora] Multiple concurrent spinners detected. This may cause visual corruption. Use one spinner at a time.

Output grows without bound (hundreds of MB within 1–2 minutes). The build never finishes, or the host process
crashes (seen with Nx, see nrwl/nx#37183).

With stdout piped (non-TTY) the build completes normally.

Cause

• v22 builds independent entry points in parallel in one process (scheduleEntryPoints in
  src/lib/ng-package/package.transform.js, maxConcurrency = min(availableParallelism() - 1, 8)).
• Each entry point creates its own ora spinner in compile-ngc.transform, write-bundles.transform and
  write-package.transform.
• ora ≥ 9.1.0 hooks process.stdout.write / process.stderr.write while a spinner is active. ora supports one
  spinner at a time. With several active spinners, the hooks wrap each other and are restored out of order, so
  every write gets more ESC[1G prefixes.
• ng-packagr 21 (sequential builds) is not affected, and neither is v22 with ora 9.0.0 (no stream hooks).

How To Reproduce

1. Create a library with ~10–20 secondary entry points (each just ng-package.json and a src/index.ts
   exporting a component).

2. Install ng-packagr 22.2.1, Angular 22.2.0, TypeScript 6.0.3, with ora resolving to 9.4.x (the default).

3. Run in a real terminal:

   ng-packagr -p ng-package.json -c tsconfig.lib.prod.json
   

   → Ora warnings, runaway output, no completion.

4. Run with piped output:

   ng-packagr -p ng-package.json -c tsconfig.lib.prod.json | cat
   

   → Completes normally.

5. Force ora@9.0.0 via overrides/resolutions and repeat step 3.

   → Completes normally.

Expected Behaviour

Parallel entry-point builds should not break TTY output. Possible fixes:

• use a single shared spinner or progress reporter for the whole build instead of one ora instance per entry
  point; or
• disable spinners when maxConcurrency > 1; or
• pin ora to ~9.0.0 as a stopgap.

Environment

ng-packagr: 22.2.1
@angular/compiler-cli: 22.2.0
typescript: 6.0.3
ora: 9.4.1 (hangs), 9.0.0 (works)
node: 24.20.0
OS: macOS (darwin-arm64)

Workaround

# pnpm-workspace.yaml
overrides:
  ng-packagr@^22>ora: 9.0.0

Or pipe output / use a non-TTY output mode (e.g. Nx --outputStyle=stream).