ms-vscode.js-debug is slow to activate

[jrieken]

• get the ms-vscode.js-debug activated
• check F1 > Startup Performance
• 🐌 it takes 265ms to load the code for that extension

| ms-vscode.js-debug                         | false | 265       | 11            | 1   

[connor4312]

Thanks for the issue. js-debug has become a big bundle that activates on quite a few things. We can probably split the "debug adapter" portion of the bundle so that only UI contributions get loaded until a debug session starts.

[connor4312]

In the linked commit I have removed our runtime dependency on TypeScript in favor of Acorn (which we were already using for beautification) which drops the bundle size from 3.6 -> 1.3MB and should significantly improve startup time.