Support Node 14

Some features, like optional chaining, are unsupported in Node 12. This can be problematic because GitHub actions supports Node 14 (14.16.1 at time of writing), leading to a split where run steps are in Node 14, but our action is running on Node 12.

Generally this is not an issue, but can be confusing because a Storybook build will work in a run step, then fail when invoked by the action.

This update is blocked by actions/runner#772, as JavaScript actions do not currently support node14.

The current workaround is to build in a run step to a known directory, then use storybookBuildDir to upload the prebuilt Storybook.

[jmhobbs]

For the issue with compiled packages, not missing language features, the action file would look something like this:

name: 'Chromatic'

on: push

jobs:
  chromatic-deployment:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1
      ############################################
      # Insert this step before npm / yarn install
      - uses: actions/setup-node@v2
        with:
          node-version: '12'
      ############################################
      - name: Install dependencies
        run: yarn
      - name: Publish to Chromatic
        uses: chromaui/action@v1
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}

[ghengeveld]

This should be fixed with chromatic@5.8.2. Please let us know if it doesn’t resolve the problem for you.