Add @netlify/heuristics package about build HOT 8 CLOSED

FYI in case this is useful, we already have some very basic heuristics set up in the app. As swyx mentioned, we only use them right now to detect a user's build command and publish folder in the "create a new site" flow once a repo is linked.

https://github.com/netlify/netlify-react-ui/blob/master/src/lib/heuristics/automation.js

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Super late here, but good point @lesliecdubs. Ideally we wouldn't have two different implementations of the same logic. Want to start exploring CLI and UI parity and code reuse more.

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yes, we can also use heuristics in the netlify UI (to suggest build command and publish folder when setting up a project for the first time). basically this has the most value as an independent project that others can use and contribute to for non netlify usecases as well.

@RaeesBhatti knows about the split-out detector todo issue from netlify dev.

netlify dev detectors currently encode way too much netlify dev specifics, we would do well to come up with a simple project detector format and some heuristics for resolving conflicts (example, every sapper project is also a svelte project, so we need to just pick sapper if it exists. or figure out what to do if for example both gatsby and jekyll are installed in repo)

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Related #12

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Related: https://twitter.com/alexander_bird/status/1180544954214432768

Functionality we could improve: if single html file in dist directory and we detect react/preact/angular/vue/etc as dep, and don't find SPA redirect, console.log "hey you might need this redirect http://direct-link-to-docs.com"

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its probably too late at this point but i would strongly suggest making heuristics a launch feature.

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I'm picking up this issue to start working on it.

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Closing as done. Between the work linked above and the new https://github.com/netlify/framework-info library, I think we're effectively covered. If there are any outstanding tasks, please break them out into new issues.

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