[wp-trac] [WordPress Trac] #42061: Add new utility function for checking if the current request is a REST API request.

[WordPress Trac]

#42061: Add new utility function for checking if the current request is a REST API
request.
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 Reporter:  lots.0.logs             |       Owner:  TimothyBlynJacobs
     Type:  enhancement             |      Status:  assigned
 Priority:  normal                  |   Milestone:  6.5
Component:  Bootstrap/Load          |     Version:  4.9
 Severity:  normal                  |  Resolution:
 Keywords:  has-patch dev-feedback  |     Focuses:  rest-api, performance
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Changes (by flixos90):

 * milestone:  Future Release => 6.5


Comment:

 @TimothyBlynJacobs I've taken another stab at this via
 https://github.com/WordPress/wordpress-develop/pull/5658. Please refer to
 the PR description for more context on what approach I am proposing.

 TL;DR: Most core use that checks `REST_REQUEST` is not actually about
 whether a "standalone" REST API request is made than it is about whether a
 REST endpoint request is currently being handled (e.g. could also be a
 preload request made within a regular WordPress request).

 Let me know your thoughts on the PR. If it's valuable, we could also
 consider splitting this apart into another ticket if you feel like it
 doesn't address the original request here as much.

 I'm putting this into 6.5 for consideration.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42061#comment:30>
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