Add Git-like suggestions for mistyped CLI commands

[ompathak2004]

Goals

1. Improve the CLI experience when users mistype a command or subcommand.
2. Suggest the closest valid Resend command, similar to how Git suggests commands.
3. Support nested commands, aliases, and avoid suggesting hidden/internal commands.

Background

Currently, when a user mistypes a Resend CLI command, the error message can be technically correct but not very helpful.

For example:

resend template
error: unknown command 'template'

In this case, the user likely meant:

resend templates

A more helpful error message could suggest the closest valid command:

resend template
error: unknown command 'template'

(Did you mean resend templates?)

This is similar to Git’s behavior when a user mistypes a command:

git adds
git: 'adds' is not a git command. See 'git --help'.

The most similar command is
  add

Adding Git-like suggestions would improve the CLI experience by helping users recover from typos quickly, especially when commands are pluralized, nested, or easy to mistype.

Proposal

I would like to add a command suggestion layer to the CLI.

The approach would be:

• Hook into Commander’s error output.
• Detect command-related errors like unknown commands or extra arguments caused by mistyped subcommands.
• Walk the registered Resend command tree to find valid commands.
• Compare the mistyped command against visible commands using an edit-distance based similarity check.
• Print a helpful suggestion when there is a close match.
• Avoid suggesting hidden/internal commands such as telemetry-related commands.
• Add tests for top-level commands, nested commands, aliases, global options, and hidden commands.

Working demo

[felipefreitag]

@ompathak2004 thanks for the suggestion, that seems like a good idea!

[ompathak2004]

I've opened a PR implementing this: #322
Happy to adjust based on feedback.