End up with following solution:

      - run: echo "::set-output name=js::$(tr '\n' ' ' < ./.github/diffWithMaster.js)"
        id: diffJS
        name: service run

      - name: Getting diff with master
        id: diff
        uses: actions/github-script@0.9.0
        with:
          any_variable: ${{github.event.ref || github.event.pull_request.head.ref}} 
          github-token: ${{secrets.GITHUB_TOKEN}}
          result-encoding: string
          script: ${{ steps.diffJS.outputs.js }}

tr '\n' ' ' for merging file into one line, so make sure you have ; in the js everywhere and don't use // comments, use block one instead.
Also, so far this is the only solution to nicely merge output (echo won't work on github actions for some reason).

Also note that in this case need to throw external variables inside script through with, and read in the script with core.getInput('any_variable').

Js script may be safely wrapped into async function to get correct syntax and avoid errors:

/* global github, context, core */
(async () => {
/*....code (remember about semicolons) */
})();

But in this case you won't be able to retrieve any returns from the script. This probably could be solved on the github-script side.

Is there any possibility to use file as a script? #38

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