Switch to Parcel for building and adjust export path and build

[holblin]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[jogibear9988]

do you still add file extensions to imports in the esm build?

[holblin]

Hi @jogibear9988 , I do not understand your question. Could you rephrase it and give me an example with the current result and the expected result if there is a concern or a problem?

[holblin]

@jogibear9988 , I will address potential feedback on the next beta / rc version

[jogibear9988]

For me this now does not work, cause I want to use it in a VSCode extension, wich does not allow .mjs at the moment.
But I created an issue for this a vscode:
microsoft/vscode#176567

[jogibear9988]

But I think the mime type for .mjs/.cjs could more often be a problem. I think to move it to two folders with .js extension would be more error prune

[holblin]

Would that be a problem for you to use version 4.2.x until microsoft/vscode#176576 is merged?
I could also, do the two folder things if the vscode PR doesn't get some traction (but that would be better if they fix it on their side).

[jogibear9988]

for me it's now not a problem any more, but I wanted to show that it could be a problem for more people, cause mime type support dor these extensions is often not so good