depmedic / benchmarks / microsoft/TypeScript

microsoft/TypeScript - GitHub Actions cost & CI smells

From the depmedic OSS benchmark dataset. Source: public workflow YAML in microsoft/TypeScript/.github/workflows.

Workflows

Per-run $ (modeled)

$1.92

Monthly $ @ 30/day

$1,728

ci-doctor findings

Numbers are modeled: 8 minutes per priced job, 30 runs per day per workflow, 30-day month, GitHub-hosted runner rate sheet. microsoft/TypeScript's real run frequency is unknown to me. Smells, however, are real - they come from parsing the actual YAML.

Findings by rule

Rule	Hits
`missing-timeout`	32
`missing-cache`	25
`pinned-action-sha`	5
`fetch-depth-zero`	5
`missing-concurrency`	4
`artifact-no-retention`	3
`always-run-on-pr`	3
`matrix-overcommit`	1

Per-workflow breakdown

Workflow	Jobs	Per-run $	Findings
`ci.yml`	13	$0.70	30
`insiders.yaml`	2	$0.13	4
`nightly.yaml`	2	$0.13	4
`accept-baselines-fix-lints.yaml`	1	$0.06	2
`close-issues.yml`	1	$0.06	1
`codeql.yml`	1	$0.06	5
`copilot-setup-steps.yml`	1	$0.06	2
`create-cherry-pick-pr.yml`	1	$0.06	3
`lkg.yml`	1	$0.06	2
`new-release-branch.yaml`	1	$0.06	4
`pr-modified-files.yml`	1	$0.06	1
`release-branch-artifact.yaml`	1	$0.06	4
`scorecard.yml`	1	$0.06	2
`set-version.yaml`	1	$0.06	3
`sync-branch.yaml`	1	$0.06	4
`sync-wiki.yml`	1	$0.06	2
`twoslash-repros.yaml`	1	$0.06	4
`update-package-lock.yaml`	1	$0.06	2

Examples of what ci-doctor reports

ci.yml · WARN missing-cache
actions/setup-node has no cache option. Add 'with: cache: <ecosystem>' to skip dep re-downloads. Saves 30-90 seconds per run.

insiders.yaml · WARN missing-cache
actions/setup-node has no cache option. Add 'with: cache: <ecosystem>' to skip dep re-downloads. Saves 30-90 seconds per run.

insiders.yaml · WARN missing-timeout
Job 'test' has no timeout-minutes. Default is 360 (6h). A hung job can drain your CI budget.

What you can do

If you maintain microsoft/TypeScript or a similar workflow shape, three patterns probably move the most dollars per minute of work:

Add a concurrency: block with cancel-in-progress: true on every PR-triggered workflow.
Set timeout-minutes on every job (default is 6 hours).
Make sure every setup-* action sets cache: <ecosystem>.

Free CLIs that automate the audit and the pin step:

npx ci-doctor             # 14-rule audit
npx ci-doctor --fix       # auto-apply the four safe fixes
npx pin-actions           # pin every uses: ref to a SHA
npx gha-budget            # estimate per-run $ + monthly

About this dataset