Miguel Ángel
cabd0616ea
* fix(cli): suppress EPIPE crashes in piped agent environments When the CLI runs inside a piped environment (Claude Code, Codex, Cursor), the reader may close the pipe before we finish writing. Node treats EPIPE on stdout/stderr as an uncaughtException, crashing the process with a non-zero exit code. Add stream-level EPIPE handlers on stdout/stderr at the top of the entry point (before any output) and make the uncaughtException handler EPIPE-aware so it exits cleanly (code 0) instead of crash-reporting. PostHog data: ~10,300 EPIPE errors over 10 days, contributing to the preview command's 43-59% failure rate in agent environments. * fix(cli): set commandFailed before EPIPE exit to prevent false success telemetry EPIPE is a pipe-reader-closed signal, not a successful run. The exit handler uses 'code === 0 && !commandFailed' to determine success — without setting commandFailed=true before process.exit(0), every EPIPE exit was recorded as success:true in telemetry. Moves the commandFailed declaration to the top of the file so the stream-error EPIPE handlers (which must run before any writes) can reference it. Also sets commandFailed=true in the uncaughtException EPIPE path for the same reason.
hyperframes
CLI for creating, previewing, and rendering HTML video compositions.
Install
npm install -g hyperframes
Or use directly with npx:
npx hyperframes <command>
Requirements: Node.js >= 22, FFmpeg
Commands
init
Scaffold a new Hyperframes project from a template:
npx hyperframes init my-video
cd my-video
preview
Start the live preview studio in your browser:
npx hyperframes preview
# Studio running at http://localhost:3002
npx hyperframes preview --port 4567
render
Render a composition to MP4:
npx hyperframes render ./my-composition.html -o output.mp4
lint
Validate your Hyperframes HTML:
npx hyperframes lint ./my-composition
npx hyperframes lint ./my-composition --json # JSON output for CI/tooling
npx hyperframes lint ./my-composition --verbose # Include info-level findings
By default only errors and warnings are shown. Use --verbose to also display informational findings (e.g., external script dependency notices). Use --json for machine-readable output with errorCount, warningCount, infoCount, and a findings array.
compositions
List compositions found in the current project:
npx hyperframes compositions
benchmark
Run rendering benchmarks:
npx hyperframes benchmark ./my-composition.html
doctor
Check your environment for required dependencies (Chrome, FFmpeg, Node.js):
npx hyperframes doctor
browser
Manage the bundled Chrome/Chromium installation:
npx hyperframes browser
info
Print version and environment info:
npx hyperframes info
docs
Open the documentation in your browser:
npx hyperframes docs
upgrade
Check for updates and show upgrade instructions:
npx hyperframes upgrade
npx hyperframes upgrade --check --json # machine-readable for agents
Documentation
Full documentation: hyperframes.heygen.com/packages/cli
Related packages
@hyperframes/core— types, parsers, frame adapters@hyperframes/engine— rendering engine@hyperframes/producer— render pipeline@hyperframes/studio— composition editor UI