Collect coverage reports from electron tests

[Irev-Dev]

In our test setup we have the following block.

  if (process.env.GENERATE_PLAYWRIGHT_COVERAGE) {
    await context.addInitScript(() =>
      window.addEventListener('beforeunload', () =>
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        (window as any).collectIstanbulCoverage(
          JSON.stringify((window as any).__coverage__)
        )
      )
    )
    const istanbulCLIOutput = join(process.cwd(), '.nyc_output')
    await fsp.mkdir(istanbulCLIOutput, { recursive: true })
    await context.exposeFunction(
      'collectIstanbulCoverage',
      (coverageJSON: string) => {
        if (coverageJSON) {
          fs.writeFileSync(
            join(istanbulCLIOutput, `playwright_coverage_${uuidv4()}.json`),
            coverageJSON
          )
        }
      }
    )
  }

Which than allows

      await activePage.evaluate(() =>
        (window as any).collectIstanbulCoverage(
          JSON.stringify((window as any).__coverage__)
        )
      )

To run to collect coverage in the test tear down. However we get "window.collectIstanbulCoverage is not a function" errors in electron. as far as I could see there was no obvious work around from google, or why the exposeFunction isn't working in an electron context, so for now we have GENERATE_PLAYWRIGHT_COVERAGE: false for the electron tests.

Maybe using the electron specific exposeInMainWorld could be a work around?