A Dagger module for Helm chart checks: lint every chart, and assert that every values file renders.

Install the module in your workspace:

dagger install github.com/dagger/helm

Run the checks:

dagger check                       # run every check in the workspace
dagger check helm:lint             # just chart linting
dagger check helm:assert-template  # just the values render assertions

Each chart is checked with its default values plus every values file matching valuesGlob — defaulting to ci/*-values.yaml, Helm chart-testing's CI values convention. assert-template intentionally skips the bare chart: some charts only render cleanly with one of their explicit values files.

Chart discovery searches for Chart.yaml at or below your current working directory, so running from a subdirectory checks only the charts in that subtree; chart paths are reported relative to it.

Each chart is mounted whole — the directory containing Chart.yaml is the chart boundary, so values, templates, dependencies, CRDs, and files referenced via .Files are all available — and each chart/values dimension runs in its own container, so results cache per dimension.

• version (default 3.18.4): the Helm version to use.
• valuesGlob (default ci/*-values.yaml): glob for chart values files to check as extra matrix dimensions.