Ability to modify log level from the JavaScript API

[natemoo-re]

There are cli flags like --quiet and --verbose, but I don't see a way to control the logger when invoking buildProject or startDevServer from Snowpack's JS API.

Any options to control the logger would be very handy for projects like Microsite which leverage Snowpack internally. When I'm using startDevServer, it automatically logs the message below, but Microsite users may be confused because their project is actually served on a different port and they don't need to know about Snowpack.

  http://localhost:3333 • http://10.0.0.1:3333
  Server started in 649ms.

[FredKSchott]

Ah you're right, we handle those flags in the CLI, outside of our programatic API. +1 for moving this into the config object.

[FredKSchott]

relevant lines of code here: https://github.com/snowpackjs/snowpack/blob/main/snowpack/src/index.ts#L57-L62

[natemoo-re]

Options in the config would be great. I'm happy to work on a PR... Do you think it would be a new top-level option or nested under one of the existing groups? Kinda seems like a top-level thing to me.

While we're addressing this, I wonder if it's worth doing something like Rollup's onwarn option? If a config provides a string, that would set the log level. But it could optionally pass a function to act as a custom logger? Might just be added complexity for now, could definitely be added down the road if it makes sense.

log: 'silent',
log({ level, name, message, task }, Logger)

[FredKSchott]

We actually follow that behavior for esinstall already (it takes a log or logger option, iirc). Definitely +1 on adding that support as well for Snowpack

[natemoo-re]

Ah cool, that's a nice way to do it. Looks like it's a top-level logger option. https://github.com/snowpackjs/snowpack/blob/main/esinstall/src/index.ts#L268

[FredKSchott]

Relevant comment for anyone looking to control logging more: #2559 (comment)