Vanilla (Parcel): Default Open File is Unexpected / Unreliable

[karlhorky]

🐛 bug report

Description of the problem

Opening a Vanilla (Parcel) sandbox, it is not clear which file will open.

I have been unable to find why this is in my quick investigation of the behavior, but starting from a fresh sandbox, its behavior can be characterized as the following through these reproduction steps:

1. A new Vanilla (Parcel) sandbox will open src/index.js, even though it is not listed under the main field in package.json
2. If this sandbox is forked by a user and this file removed (either with or without the reference in index.html), then the default file that will open will now be index.html
3. If the src/styles.css file is renamed to src/index.css then this file will now be the default file to open.
4. If the index.html file is deleted and recreated, this will again become the default file to open 😳

It seems like there should be a more clear, reliable list of default files. My suggestion would be:

1. Optional: The last files open, if any (see Open previous files on Refresh #1456 below)
2. Initial opened file setting (see Set initial opened file, skip deps install & do not run start scripts as options in sandbox.config.json #514 below)
3. The main field in package.json

If these three configuration options are not set, I would suggest not opening any file initially.

This may also apply to other templates, potentially in different ways.

How has this issue affected you? What are you trying to accomplish?

I would like my sandboxes to have a reliable default initial file, based on clear rules.

Link to sandbox: link (optional)

Your Environment

Software	Name/Version
Сodesandbox	PROD-1564761038-1a9fb01ba
Browser	Chrome 76.0.3809.87 (Official Build) (64-bit)
Operating System	macOS Mojave 10.14.6 (18G84)

Related

Allow setting the initial opened file in sandbox.config.js: #514

Add sandbox configuration to change default opened file: #1254

Other related features:

Array syntax for main field in package.json: #1739

Open previously-opened files on refresh: #1456

Partially related:

Vanilla (Parcel) Unreliable Behavior When index.html Under Other Path (for example, in src)
#2240

[lbogdan]

Hey @karlhorky ,

Thanks for the really detailed description! (for the other opened issues, also 🙂) I'll brainstorm this with the team and hopefully we'll come up with a clear / intuitive enough solution.

[andyrichardson]

Weirdly enough I'm having this same issue.

Here's my sandbox.

Currently despite my main being set in package.json, it always opens the lock file by default.

Note: Also using Parcel.js

[github-actions]

This issue is stale because it has been open many days with no activity. It will be closed soon unless the stale label is removed or a comment is made.

[karlhorky]

not stale, although this point is no longer true:

3. If the src/styles.css file is renamed to src/index.css then this file will now be the default file to open.

[karlhorky]

And the file URL parameter helps a lot with specifying a file to open, also on a new sandbox:

https://codesandbox.io/s/new?file=/public/index.html

[github-actions]

This issue has automatically been marked stale because there has been no activity in a while. Please leave a comment if the issue has not been resolved, or if it is not stale for any other reason. After 2 weeks, this issue will automatically be closed, unless a comment is made or the stale label is removed.

[karlhorky]

not stale

[github-actions]

This issue has automatically been marked stale because there has been no activity in a while. Please leave a comment if the issue has not been resolved, or if it is not stale for any other reason. After 2 weeks, this issue will automatically be closed, unless a comment is made or the stale label is removed.

[karlhorky]

not stale

[github-actions]

This issue has automatically been marked stale because there has been no activity in a while. Please leave a comment if the issue has not been resolved, or if it is not stale for any other reason. After 2 weeks, this issue will automatically be closed, unless a comment is made or the stale label is removed.

[karlhorky]

not stale