vscode: "Unbound breakpoint" (missing source maps) when debugging any typescript project (after 1.83.0 update)

Type: Bug

I recently stopped being able to use breakpoints across multiple typescript projects (they show up as Unbound breakpoint because source maps aren’t found), and I’m wondering if it’s a bug in the recent 1.83.0 release. Here’s a simple repro:

1. Launch latest insiders build with --disable-extensions (on mac):

   • /Applications/Visual\ Studio\ Code\ -\ Insiders.app/Contents/Resources/app/bin/code --disable-extensions

2. Open a sample typescript project from vscode-extension-samples:

   • https://github.com/Microsoft/vscode-extension-samples/tree/main/document-editing-sample
   • I’m on commit a8a74c4 (2023-10-03), and I have no local changes

3. Run npm install in the project dir:

~/hack/vscode/vscode-extension-samples/document-editing-sample $ npm install

added 133 packages, and audited 134 packages in 1s

34 packages are looking for funding
  run `npm fund` for details

1 moderate severity vulnerability

To address all issues, run:
  npm audit fix

Run `npm audit` for details.

1. Set a breakpoint, observe that it shows as red (no debugger running yet):

   

2. Run Debug: Start Debugging (F5)

3. Observe that the breakpoint icon changes from red to gray, and shows Unbound breakpoint on hover:

   

4. Click the “troubleshoot” link (Debug: Diagnose Breakpoint Problems) and observe that it says it can’t find the source maps:

   

5. Observe thattsconfig.json and .vscode/launch.json both look sane:

~/hack/vscode/vscode-extension-samples/document-editing-sample $ cat tsconfig.json
{
	"compilerOptions": {
		"module": "commonjs",
		"target": "es2020",
		"lib": ["es2020"],
		"outDir": "out",
		"sourceMap": true,
		"strict": true,
		"rootDir": "src"
	},
	"exclude": ["node_modules", ".vscode-test"]
}

~/hack/vscode/vscode-extension-samples/document-editing-sample $ cat .vscode/launch.json
// A launch configuration that compiles the extension and then opens it inside a new window
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Extension",
            "type": "extensionHost",
            "request": "launch",
            "runtimeExecutable": "${execPath}",
            "args": [
                "--extensionDevelopmentPath=${workspaceFolder}"
            ],
            "outFiles": [
                "${workspaceFolder}/out/**/*.js"
            ],
            "preLaunchTask": "npm: watch"
        }
    ]
}

~/hack/vscode/vscode-extension-samples/document-editing-sample $ ls -l out/**/*.js*
-rw-r--r-- 1 danb staff 882 Oct  6 15:00 out/extension.js
-rw-r--r-- 1 danb staff 775 Oct  6 15:00 out/extension.js.map

VS Code version: Code - Insiders 1.84.0-insider (Universal) (874831ebcf088f59735879156f62308ce48f17d1, 2023-10-06T19:18:47.163Z) OS version: Darwin arm64 22.6.0 Modes:

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