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

Inizia leggendo i comandi TS Server esistenti e il percorso getCombinedCodeFix menzionato nell’issue, quindi confronta il modo in cui VS Code invoca source.removeUnused. Il lavoro è completato quando un comando rimuove solo il codice irraggiungibile sicuro, gli import inutilizzati e le dichiarazioni inutilizzate, lasciando invariati i parametri e le variabili potenzialmente soggette a effetti collaterali.