TypeScript debugging breakpoints broke on VSCode 1.25.1

[luthfianto]

• VSCode Version: 1.25.1
• OS Version: macOS 10.13.4 (17E199)

Steps to Reproduce:

1. Debug a Typescript project on VSCode 1.25.1. (Details: my project is not a frontend/webpack project)
2. Breakpoints would be unverified despite enabled sourcemap and correctlaunch.json and
   tsconfig.json

My launch.json after I tried different configurations on 1.25.1:

        {
            "name": "LAUNCH",
            "type": "node",
            "request": "launch",
            "runtimeArgs": [
                "--nolazy"
            ],
            "envFile": "${workspaceFolder}/.env",
            "sourceMaps": true,
            "cwd": "${workspaceFolder}",
            "program": "${workspaceFolder}/start.js",
            "outFiles": [
                "${workspaceFolder}/lib/**/*.js"
            ],
            "protocol": "inspector",
            "trace": "all"
        },

on launch.json I've tried to enable normal sourcemap or inlined sourcemap, no success.

3. Sometimes this error pops on 1.25.1 when I hit the debug launch button:

Found no exact match on Google, seems like it's a new bug

4. If I grep the log/trace it would show the sourcemap is found/loaded/created. But breakpoints are still unverified

SourceMap: creating for /Users/rilut/myproject/lib/components/repos/my_repo.js
SourceMaps.scriptParsed: /Users/rilut/myproject/lib/components/repos/my_repo.js was just loaded and has mapped sources: ["/components/repos/my_repo.ts"]

5. After reading @chriscordova comment on Debugger opens incorrect file #54697 (comment) that everything are okay in 1.24.1, I decided to downgrade to VSCode 1.24.1. (Details: I open the 1.24.1 without closing the 1.25.1)

6. Breakpoints are working in 1.24.1 even without any configurations, I still use the exact launch.json from no 2

7. Can't re-reproduce the error on 1.25.1 because when I press debug:

Debug adapter executable '/Users/rilut/.vscode/extensions/ms-vsliveshare.vsliveshare-0.3.395/dotnet_modules/Microsoft.Cascade.VSCodeHostAdapter' does not exist.

[weinand]

Can you still reproduce if you disable the Liveshare extension?

[luthfianto]

Yes, I can launch debug again in 1.25.1, and the Unverified Breakpoints still exist.

Which logs should I provide?

[roblourens]

Can you try this in insiders? Sounds similar to #54026

[luthfianto]

I can confirm breakpoints works again in Insider.

• rm -rf lib && tsc
• debug in 1.25.1, debugging doesn't work
• debug in Insider, debugging works

[roblourens]

Great, thanks for trying that.