chapter8 chapter10 parcel package.json, index.html error

[neilhan]

In chapter8 and chapter 10, follow 2 changes are needed to run parcel src/index --open

package.json "main":"" will cause an error. To start parcel, it need to be:

"main": "output/Main/index.js"

for src/index.html, this line need to be updated. "type='module'" is required.

<script type="module" src="./index.js"></script>