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Calling Functions

dagger check, dagger generate, and dagger up are conveniences built on top of the underlying primitive: calling a module's functions. When you need something those verbs don't cover, call functions directly.

dagger call jest test

dagger call is shorthand for dagger function call.

Discover functions​

List the functions available in your workspace:

dagger function list

List the functions on a specific module:

dagger function list jest

Every function and its arguments are also visible through --help:

dagger call jest --help

Pass arguments​

Arguments are flags on the function that accepts them:

dagger call jest --package-manager=yarn test

Secrets are passed the same way, via provider URIs — see Secrets:

dagger call deploy --token=env:DEPLOY_TOKEN

Chain functions​

Functions interconnect into a pipeline. Each function returns an object, and the next function is called on that result:

dagger -m core call container \
  from --address=alpine \
  with-exec --args=echo,hello \
  stdout

Output​

By default the result is printed to your terminal. Format it as JSON:

dagger call jest test --json

Or save a returned file or directory to the host:

dagger call build --output=./dist