Automatically install npm packages when running a script in Bun's runtime

[Jarred-Sumner]

This enables automatically installing npm packages used in a script and resolving from a global shared cache when no node_modules folder is present.

It works:

• with and without package.json
• with and without lockfiles

package.json can be used the same as with node_modules. The version ranges specified in the package.json for dependencies become the default used in the runtime. This makes it so you don't have to run npm install or bun install to install dependencies in Bun's runtime. There is no special syntax.

TODO:

• Tests
• Error handling
• Disable version specifier support when a package.json is present
• Update README for changes
• Load lockfile from nearest package.json
• Enable progress bar
• Save lockfile
• Add a flag that enables it even if a node_modules folder is present. Useful for monorepos with a <workspace>/scripts folder. Thinking something like: (cc @colinhacks), though they might actually put it in "scripts" within package.json

bun -i scripts/extract-tps-reports.js

Out of scope for this first release:

• TypeScript support (generate .d.ts)
• Nested lockfiles

[Jarred-Sumner]

Some of the errors:

Bug where error message is different if cached. I think we should ship with this known bug in the initially because fixing it is a pain and it's still informative

[Jarred-Sumner]

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[Jarred-Sumner]

Still need to write tests, but there's enough conflicting changes that I'm going to go ahead and merge it