I have a github workflow where I want to filter the terraform destroy changes from the terraform plan file and post that as comment in the PR.

    - name: Terraform Plan
      id: plan_json
      run: |
        terraform plan -out planfile 2>error.log
        terraform show -json planfile > plan.json
      continue-on-error: true

    - uses: actions/github-script@v5
      id: message
      if: ${{ always() }}
      with:
        result-encoding: string
        script: |
          const fs = require('fs');
          const report = JSON.parse(fs.readFileSync('./plan.json'));

          var message = '';
          for (const changes in report.resource_changes) {
            message += `${changes.change.actions[0]} ${changes.name} (${changes.type})\n`
          };

          console.log('Message: ', message);
          return message;

When I run the workflow it gives this error:

SyntaxError: Unexpected token c in JSON at position 1
    at JSON.parse (<anonymous>)
    at eval (eval at callAsyncFunction (/home/runner/work/_actions/actions/github-script/v5/dist/index.js:4942:56), <anonymous>:4:21)
    at callAsyncFunction (/home/runner/work/_actions/actions/github-script/v5/dist/index.js:4943:12)
Error: Unhandled error: SyntaxError: Unexpected token c in JSON at position 1
    at main (/home/runner/work/_actions/actions/github-script/v5/dist/index.js:4997:26)
    at Module.272 (/home/runner/work/_actions/actions/github-script/v5/dist/index.js:4981:1)
    at __webpack_require__ (/home/runner/work/_actions/actions/github-script/v5/dist/index.js:24:31)
    at startup (/home/runner/work/_actions/actions/github-script/v5/dist/index.js:43:19)
    at /home/runner/work/_actions/actions/github-script/v5/dist/index.js:49:18
    at Object.<anonymous> (/home/runner/work/_actions/actions/github-script/v5/dist/index.js:52:10)
    at Module._compile (internal/modules/cjs/loader.js:959:30)

I don't have any nodejs/javascript experience so I have no clue what I am doing wrong here.

The actual plan file can be found here.

When I run the nodejs script locally it works.

❯ node tfplan.js
Message:  create, rg (azurerm_resource_group)
create, rg-name (random_pet)