[Feature Request] Print project directory when diagnostics enabled

Search Terms

diagnostics, project directory

Suggestion

I have about 40+ sub-projects in a composite project right now and when building, it takes about 10 minutes.

It's hard to troubleshoot which projects are the bottleneck when I don't even know which projects are being built.

Enabling diagnostics only tells me how long a project took but doesn't tell me what that project is.

So, my feature request is to print the project directory when diagnostics is enabled.

At the moment, I've modified my own tsc.js,

//Find this line
reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);

//Replace with this snippet
reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);
if (program.getRootFileNames().length > 0) {
    const path = program.getRootFileNames()[0].replace(/\/[^/]+?\.[^.]+?$/, "");
    reportStatisticalValue("Project", (
        path.indexOf(program.getCurrentDirectory()) == 0 ?
            path.substr(program.getCurrentDirectory().length) :
            path
    ));
}

It works enough for me,

Files:                                      2944
Lines:                                    279749
Nodes:                                   1473021
Identifiers:                              417022
Symbols:                                  295304
Types:                                        73
Memory used:                             748010K
Assignability cache size:                      0
Identity cache size:                           0
Subtype cache size:                            0
I/O Read time:                             0.02s
Parse time:                                0.21s
Program time:                              0.84s
Bind time:                                 0.18s
printTime time:                            0.01s
Emit time:                                 0.01s
I/O Write time:                            0.01s
Total time:                                1.03s
Project:                  /src/app-route-handler

I don't really know much about the TypeScript API. There's probably a proper way to get this information but with my limited knowledge, I managed to hack that together.

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

Start by locating the diagnostics reporting code around reportTimeStatistic in tsc.js and inspect how program.getRootFileNames() and program.getCurrentDirectory() are available. The change is complete when diagnostics output identifies the project directory for each reported project; use the existing reportStatisticalValue pattern as the reference.