Support file URLs for --experimental-modules

[roblourens]

When running Node with the --experimental-modules flag, it returns file paths as file URLs, not paths. We need to handle both formats.

We can set breakpoints without the file: prefix, because the regex still matches the rest. On Windows, slashes would have to changed to forward slashes.

[jpike88]

@roblourens just confirming that you think microsoft/vscode#45750 is directly related to this issue? It seems the case but just want your opinion

[roblourens]

Yes I am pretty sure it is

[zaverden]

@roblourens
could you please share plans when it will be implemented?

As I can see, breakpoints work in CJS file even with --experimental-modules flag. I believe, URL-formated paths is only for ESM files, and it'll be this way after they came out of flag.
In this case I believe a due date for file ULRs support is a date of a ESM release, but do you have plans to implement it earlier?

[roblourens]

No immediate plans but do you know when they will be out from the flag or considered "stable"?

[alexewerlof]

This works on Node 10 (I used nvm):

Open VS Code terminal and make sure you have Node 10:

$ nvm i 10
Downloading and installing node v10.4.0...
Downloading https://nodejs.org/dist/v10.4.0/node-v10.4.0-darwin-x64.tar.xz...
######################################################################## 100.0%
Computing checksum with shasum -a 256
Checksums matched!
Now using node v10.4.0 (npm v6.1.0)

$ node --version
v10.4.0

.vscode/launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch Program",
            "program": "${workspaceFolder}/index.mjs",
            "runtimeArgs": [
                "--experimental-modules"
            ]
        }
    ]
}

Debug

Now put a breakpoint in your code and press F5 to debug!