task/docs/taskfile_versions.md

Taskfile Versions

The Taskfile syntax and features changed with time. This document explains what changed on each version and how to upgrade your Taskfile.

What the Taskfile version mean

The Taskfile version follows the Task version. E.g. the change to Taskfile version 2 means that Task v2.0.0 should be release to support it.

The version: key on Taskfile accepts a semver string, so either 2, 2.0 or 2.0.0 is accepted. If you choose to use 2.0 Task will not enable future 2.1 features, but if you choose to use 2, then any 2.x.x features will be available, but not 3.0.0+.

Version 1

NOTE: Taskfiles in version 1 are not supported on Task >= v3.0.0 anymore.

In the first version of the Taskfile, the version: key was not available, because the tasks was in the root of the YAML document. Like this:

echo:
  cmds:
    - echo "Hello, World!"

The variable priority order was also different:

1. Call variables
2. Environment
3. Task variables
4. Taskvars.yml variables

Version 2.0

At version 2, we introduced the version: key, to allow us to evolve Task with new features without breaking existing Taskfiles. The new syntax is as follows:

version: '2'

tasks:
  echo:
    cmds:
      - echo "Hello, World!"

Version 2 allows you to write global variables directly in the Taskfile, if you don't want to create a Taskvars.yml:

version: '2'

vars:
  GREETING: Hello, World!

tasks:
  greet:
    cmds:
      - echo "{{.GREETING}}"

The variable priority order changed to the following:

1. Task variables
2. Call variables
3. Taskfile variables
4. Taskvars file variables
5. Environment variables

A new global option was added to configure the number of variables expansions (which default to 2):

version: '2'

expansions: 3

vars:
  FOO: foo
  BAR: bar
  BAZ: baz
  FOOBAR: "{{.FOO}}{{.BAR}}"
  FOOBARBAZ: "{{.FOOBAR}}{{.BAZ}}"

tasks:
  default:
    cmds:
      - echo "{{.FOOBARBAZ}}"

Version 2.1

Version 2.1 includes a global output option, to allow having more control over how commands output are printed to the console (see documentation for more info):

version: '2'

output: prefixed

tasks:
  server:
    cmds:
      - go run main.go
  prefix: server

From this version it's also possible to ignore errors of a command or task (check documentation here):

version: '2'

tasks:
  example-1:
    cmds:
      - cmd: exit 1
        ignore_error: true
      - echo "This will be print"

  example-2:
    cmds:
      - exit 1
      - echo "This will be print"
    ignore_error: true

Version 2.2

Version 2.2 comes with a global includes options to include other Taskfiles:

version: '2'

includes:
  docs: ./documentation # will look for ./documentation/Taskfile.yml
  docker: ./DockerTasks.yml

Version 2.6

Version 2.6 comes with preconditions stanza in tasks.

version: '2'

tasks:
  upload_environment:
    preconditions:
      - test -f .env
    cmds:
      - aws s3 cp .env s3://myenvironment

Please check the documentation