Check that dependencies are install before running scripts

[Nick-Mazuk]

What is the problem this feature would solve?

It's easy to begin development with the wrong dependencies installed. Here's some examples:

• Switch branches, where the new branch has different dependencies
• Pull the repo for the first time

What is the feature you are proposing to solve the problem?

Normally you'd have to remember to run bun i in these scenarios. I'd like bun to "remember" for me.

Before I run a script in the "scripts" field of the package.json (or bun test, etc.), I'd like bun to check that the correct dependencies are installed then either:

• Error out, notifying me that I should run bun i
• Automatically install the dependencies for me (i.e., run bun i in the background).

Drawbacks:

• This will increase the latency of every command. It may be possible to utilize caching to speed this up for subsequent bun invocations.
• Automatically running bun i can pose security risks (because postinstall scripts can run arbitrary code), so doing this should be opt-in on the developer-level in my opinion.

What alternatives have you considered?

Keep the status quo.