Set default output of filter if none are matched?

I would like to be able to set the default output if the list is empty.

Using the below as an example, I would like to be able to do two things.

1. Set a default like with.default: [src, server]
2. Have an option to use all filters as the default if empty. with.outputAllFilters: true or something like that

jobs:
  tests:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: dorny/paths-filter@v2
      id: filter
      with:
        filters: |
          backend:
            - 'backend/**'
          frontend:
            - 'frontend/**'

[Bearbobs]

The common pattern combined with YAML anchors would likely work.

However, there is one more question I have to make sure it would work.

In my common pattern, I would like to include almost all of a top level folder and ignore a specific sublevel folder.

I can do this in on.push/on.pull_request like below.

Is there a way I can do similarly in the common pattern? Or does micromatch only support inclusion not exclusion?

name: Snapshot Tests - Non-US
on:
    push:
        paths:
            # Generic
            - banners/**
            - modals/**
            - server/**
            - src/**
            - tests/functional/spec/*
            - tests/functional/spec/utils/**
            - utils/**
            # Exclude US Files
            - '!banners/US/**'
            - '!modals/US/**'
            - '!server/locale/US/**'
            - '!src/components/modal/content/US*/**'
            - '!tests/functional/spec/US/**'

@merlinpatt you can use same filters in an inverted approach where you seperate out both path to exculde and include under two filter and use if condition in github workflow to make the decision,like:

  changes:
    runs-on: ubuntu-latest
    # Set job outputs to values from filter step
    outputs:
      paths-to-exclude: ${{ steps.filter.outputs.paths-to-exclude }}
      paths-to-include: ${{ steps.filter.outputs.paths-to-include }}
    steps:
      - uses: actions/checkout@v2
      - uses: dorny/paths-filter@v2
        id: filter
        with:
          filters: |
            paths-to-include:
                - banners/**
                - modals/**
                - server/**
                - src/**
                - tests/functional/spec/*
                - tests/functional/spec/utils/**
                - utils/**
            paths-to-exclude: 
                - 'banners/US/**'
                - 'modals/US/**'
                - 'server/locale/US/**'
  run-tests:
    name: Run tests
    needs: [changes]
    if: |
      ${{ (needs.changes.outputs.paths-to-exclude == 'false' && needs.changes.outputs.paths-to-include == 'true') ||  (needs.changes.outputs.paths-to-exclude == 'true' && needs.changes.outputs.paths-to-include == 'true') }}
    #actual workflow

[merlinpatt]

The common pattern combined with YAML anchors would likely work.

However, there is one more question I have to make sure it would work.

In my common pattern, I would like to include almost all of a top level folder and ignore a specific sublevel folder.

I can do this in on.push/on.pull_request like below.

Is there a way I can do similarly in the common pattern? Or does micromatch only support inclusion not exclusion?

name: Snapshot Tests - Non-US
on:
    push:
        paths:
            # Generic
            - banners/**
            - modals/**
            - server/**
            - src/**
            - tests/functional/spec/*
            - tests/functional/spec/utils/**
            - utils/**
            # Exclude US Files
            - '!banners/US/**'
            - '!modals/US/**'
            - '!server/locale/US/**'
            - '!src/components/modal/content/US*/**'
            - '!tests/functional/spec/US/**'