CT: [PAGE ERROR] Error: SyntaxError: The requested module 'X.js' does not provide an export named 'default'

[zepumph]

This comes up a fair bit. @samreid and I discussed and feel like this is likely about race conditions in chipper dist. There are potentially multiple processes at once that are transpiling into that directory and reading from it.

Some places to investigate:

• Does Snapshot.create or some other top level spot do an initial transpile when it does a copy to a new directory?
• Do builds do a transpile step?
• Should we investigate "locking" the directory? This will help us understand what may be writing to chipper/dist after the fact. I would have assumed that there wouldn't be much writing. Just reading, but you could have trouble even if we were writing the same output to a file.
• This may be a browser resource issue.
• Perhaps don't do extra tranpiles during build, opt out of https://github.com/phetsims/chipper/blob/06c1847a25a64a5b54c02a0b5f9fd18508a28ba9/js/grunt/Gruntfile.js#L257

[zepumph]

I'd like to run a quick test here where we ask CT to not transpile. I think it will be a pretty simple job and then we can test to see if that cleans up CT.

[zepumph]

I added flags to opt out of transpile and tsc (while I was at it), and then updates CT to use them. Let's see how things go.

[zepumph]

In builds CT also get's errors like:

Error in fulfilling chunk Promise: [Error: TypeError: Yn(...) is not a function
at new zn (http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1035:588885)
at 733 (http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1035:880825)
at i (http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1035:1143250)
at http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1035:1144009
at http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1035:2328403
at phet.chipper.runWebpack (http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1035:2328407)
at i (http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1036:1052)
at t (http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1036:1080)
at http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1036:1105
at http://localhost:38227/circuit-construction-kit-ac/build/phet-io/circuit-construction-kit-ac_all_phet-io.html?ea&brand=phet-io&phetioStandalone&phetioPrintAPI&randomSeed=332211&locales=*:1036:1207]
Snapshot from 9/22/2023, 12:04:26 PM

I think this may be similar chipper/dist race conditions, and I will report back if CT shows any of these problems after the above fix. I don't think it will though.

[zepumph]

I haven't seen any of these errors in the last 2 days, whereas they were in about ~50% of columns before. Yay! @samreid can you please review the commits and see if there is anything else you can think of here?

[samreid]

This seems to be working well, thanks! The main part for me would be to document https://github.com/phetsims/aqua/commit/9634caffb43a7de8bf273e09ae4c1526eedee77d and describe what other process is responsible for the parts that are opting-out here. How can we be confident the other process solved those parts beforehand?

[zepumph]

Yeah good idea thanks. Closing