fix(compiler): fix transitive module dependencies in unit tests (#2178)

[chrisdarroch]

This should resolve a few Cannot use import statement outside a module errors when spec files are run.

There's a slightly deeper problem here re: who decides what is a module. Both typescript and jest can be configured to accept different extensions as module types, but neither configuration is honoured by the stencil compiler when spec files are run. Perhaps a better fix would be to inspect the opts in this helper function to determine which extensions to add here.

Adding js to the list of files to compile may introduce potential slowness or problems, as more files will be run through the typescript compiler now.

[chrisdarroch]

I'm happy to submit tests and/or make a more nuanced fix for this problem.

At the moment, I'm unable to get a development environment set up so that I can run the test suite successfully, as I'm getting the following errors:

> npm run test
> @stencil/core@1.15.0 test /Users/cdarroch/work/github/stencil
> jest

● Validation Error:

  Preset ./testing/jest-preset.js is invalid:

  The "id" argument must be of type string. Received type object
  TypeError [ERR_INVALID_ARG_TYPE]: The "id" argument must be of type string. Received type object

> npm run build
> @stencil/core@1.15.0 build <checkoutdir>/stencil
> node scripts && npm run tsc.prod && npm run rollup.prod.ci


> @stencil/core@1.15.0 tsc.prod <checkoutdir>/stencil
> tsc


> @stencil/core@1.15.0 rollup.prod.ci <checkoutdir>/stencil
> rollup --config --config-prod --config-ci

[!] Entry module not found: Error: Can't resolve '<checkoutdir>/stencil/src/sys/node/bundles/glob.js' in '<checkoutdir>/stencil'
resolve '<checkoutdir>/stencil/src/sys/node/bundles/glob.js' in '<checkoutdir>/stencil'
  using description file: <checkoutdir>/stencil/package.json (relative path: .)
    using description file: <checkoutdir>/stencil/package.json (relative path: ./src/sys/node/bundles/glob.js)
      no extension
        <checkoutdir>/stencil/src/sys/node/bundles/glob.js doesn't exist
      .wasm
        <checkoutdir>/stencil/src/sys/node/bundles/glob.js.wasm doesn't exist
      .mjs
        <checkoutdir>/stencil/src/sys/node/bundles/glob.js.mjs doesn't exist
      .js
        <checkoutdir>/stencil/src/sys/node/bundles/glob.js.js doesn't exist
      .json
        <checkoutdir>/stencil/src/sys/node/bundles/glob.js.json doesn't exist
      as directory
        <checkoutdir>/stencil/src/sys/node/bundles/glob.js doesn't exist

I also could not spot a sub-module responsible for testing the testing package... could you point that out to me?

[manucorporat]

Thanks for your PR!