[DRAFT] feat: bun support

[jennifer-shehane]

• Closes

Additional details

Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

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Note

Adds Bun package manager support (detection, install commands, schema/types) and introduces Bun-focused system tests/projects.

• Core/App:
  • Add bun to PackageManagerEnum in schema.graphql and to PACKAGE_MANAGERS in packages/types.
  • Detect bun.lock in ProjectLifecycleManager.getPackageManagerUsed().
  • Wizard install command supports Bun (bun add -D).
• System Tests/Tooling:
  • Dependency installer detects conflicting lockfiles incl. bun.lock and runs appropriate installer (getBunCommand, getPnpmCommand).
  • Implement getBunCommand (env-based cache) and getPnpmCommand utilities; enhance runner to pass env to execa.
  • Update cache bootstrap to optionally install Cypress via Bun.
  • Improve projects-yarn-install.js:
    • Workspace package detection (supports yarn/npm/pnpm/bun lockfiles).
    • Skip Bun projects during CI cache step; export isWorkspacePackage.
• New System-Test Projects:
  • bun-with-deps, bun-component-testing (React + TS), bun-workspace (workspaces), and pristine-bun fixtures with bun.lock.
• Tests:
  • New specs: Bun CLI usage, e2e/component with Bun, TypeScript with Bun, workspace handling, and workspace detection unit tests.

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[cypress]

cypress    Run #67581

Run Properties:   Passed #67581  •  3c6bcc5c1c: Update bun_cli_spec.ts

Project	cypress
Branch Review	bun-support
Run status	Passed #67581
Run duration	19m 00s
Commit	3c6bcc5c1c: Update bun_cli_spec.ts
Committer	Jennifer Shehane
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	13
Pending	1097
Skipped	4
Passing	26698
View all changes introduced in this branch ↗︎

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Warning

Partial Report: The results for the Application Quality reports may be incomplete.

UI Coverage  45.48%
Untested elements	188
Tested elements	161

Accessibility  98%
Failed rules	4 critical   8 serious   2 moderate   2 minor
Failed elements	101

[MikeMcC399]

@jennifer-shehane

Does this mean that you are now considering supporting Bun?

• As package manager alternative?
• As Node.js alternative?
• Or both?

There are a couple of related issues / PRs:

• Add support for Bun #28962
• Support Bun: Running Bun Install in Docker gives The Cypress App could not be downloaded #28722
• feat: add Bun package manager support circleci-orb#560

[jennifer-shehane]

@MikeMcC399 Yes, was trying it out to see what the blockers were. It seems to be mostly working fine, but we need to restructure some of the test installs.