[wp-trac] [WordPress Trac] #48456: Update CodeMirror to latest v5 version

[WordPress Trac]

#48456: Update CodeMirror to latest v5 version
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 Reporter:  TobiasBg                       |       Owner:  westonruter
     Type:  enhancement                    |      Status:  accepted
 Priority:  normal                         |   Milestone:  7.0
Component:  External Libraries             |     Version:  4.9
 Severity:  normal                         |  Resolution:
 Keywords:  early has-patch needs-testing  |     Focuses:  javascript
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Comment (by westonruter):

 In addition to the PR attached to this ticket, I've opened a sub-PR to
 replace Esprima with Espree in the JavaScript linter:
 https://github.com/westonruter/wordpress-develop/pull/4 This is important
 because Esprima does not support ES6, so any scripts using `const`, `let`
 and the like currently show up as syntax errors.

 This deprecates the use of `fakejshint.js` while at the same time
 registering `espree` as a //script module//. This then gets imported
 dynamically by a new `javascript-lint.js` which replaces that module in
 the CodeMirror build. Note that since classic scripts cannot explicitly
 depend on script modules (#61500), this is currently implemented as a bit
 of a hack. A new `wp-codemirror` script module is registered with an empty
 string `src`. This module has `espree` added as a dynamic dependency. The
 empty string has the effect of preventing the `wp-codemirror` script
 module from being printed, while at the same time any of its dependencies
 still get added to the `importmap`.

 I expect to file a new ticket for this Esprima to Espree upgrade, once
 CodeMirror v5 is upgraded.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48456#comment:17>
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