Add TS server command for removing all unused code in a file

Search terms

• code action
• source action
• getCombinedCodeFix

Feature request

Add a new TS Server command that removes all unused code in a file. This should only perform 'safe' removals, such as:

• Unreachable code
• Unused imports
• Unused declarations

We should likely not remove unused parameters. Not sure about removing unused variable since removing them can also have side effects

Use case

VS Code allows users to configure code actions that are run on save. One of the supported code actions is source.removeUnused which attempts to remove unused code in a file

On the VS Code side, we can't implement this very well since unused code often ends up overlapping with other unused code and we don't have much insight into what is "safe" to remove and what is not

Comienza leyendo los comandos existentes de TS Server y la ruta getCombinedCodeFix mencionada en el issue; después, compara cómo VS Code invoca source.removeUnused. Se considera terminado cuando un comando elimina únicamente código inalcanzable seguro, imports no utilizados y declaraciones no utilizadas, dejando intactos los parámetros y las variables que podrían tener efectos secundarios.