Fail to build application with TypeScript 6

[stc1988]

As reported in this issue, builds using TypeScript 6 fail.

According to the release notes, there seem to be two issues.

• rootDir now defaults to .
• Deprecated: --baseUrl

[phoddie]

Thanks for opening this issue. I hope we can resolve this painlessly. I suppose in a perfect world, the solution would work with both TypeScript 5 and TypeScript 6.

[phoddie]

It looks like the change is pretty simple. In mcmanifest.js change

baseUrl: "./",

...to:

rootDir: tool.mainPath

We'll roll this into the April release. If you have a chance to try it before then, please let me know how it goes.

[stc1988]

I tried it, and in many cases there were no problems.
However, there is an issue when the application’s manifest file and the target source code are in different directories.

Manifest file of this example app includes manifest file in different directory.

As a result, you get a build error like the following.

# tsc tsconfig.json
error TS6059: File '/Users/satoshi/Projects/moddable-m5chain/src/m5chain/m5chainDevices/m5chainBus.ts' is not under 'rootDir' '/Users/satoshi/Projects/moddable-m5chain/examples/basic'. 'rootDir' is expected to contain all source files.
  The file is in the program because:
    Part of 'files' list in tsconfig.json

  ../../../moddable/build/tmp/esp32/debug/basic/files/tsconfig.json:466:3
    466   "/Users/satoshi/Projects/moddable-m5chain/src/m5chain/m5chainDevices/m5chainBus.ts",
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    File is matched by 'files' list specified here.

[phoddie]

Thanks for giving it a try! Happy we made some progress. I'll try to reproduce your failure case.

[stc1988]

In my failure case, by overriding typescript section in the manifest file as shown below, I was able to specify a common directory, and it worked well.

"typescript": {
	"tsconfig": {
		"compilerOptions": {
			"rootDir": "$(PWD)/../../"
		}
	}
}

On the other hand, I also thought of a very troublesome case.
In case of including Git Repositories, since the repository is cloned under the project’s temporary build directory, I think it would be difficult to set a common rootDir.

[phoddie]

Thanks for the example. There's no easy fix. The Moddable SDK has one idea about how to map source files to output (we use the module specifier) and TypeScript has another (they match the source tree organization). The solution is to use a separate tsconfig.json for each TypeScript source file so that the Moddable SDK build can control the mapping. I have this working, but it needs further testing. Source files can be in entirely arbitrary locations, like your parallel moddable-m5chain repo and downloaded git repos.