[wp-trac] [WordPress Trac] #64558: CodeMirror: JavaScript linting is incompatible with newer language features

[WordPress Trac]

#64558: CodeMirror: JavaScript linting is incompatible with newer language features
--------------------------------+-------------------------
 Reporter:  westonruter         |      Owner:  westonruter
     Type:  defect (bug)        |     Status:  assigned
 Priority:  normal              |  Milestone:  7.0
Component:  External Libraries  |    Version:  4.9.3
 Severity:  normal              |   Keywords:
  Focuses:  javascript          |
--------------------------------+-------------------------
 In #42850 (r42547), JSHint was replaced with Esprima due to the former
 having a GPL-incompatible license. However, the
 [https://www.npmjs.com/package/esprima `esprima` package] has not been
 updated since July 2018. Because it hasn't been updated in so long, it
 does not support "newer" syntax ECMAScript syntax (since 2020) like
 dynamic imports, optional chaining, and nullish coalescing:

 {{{#!js
 async function getMod() {
     const mod = await import( 'https://example.com/module.js' );
     // ❌ ------------^
     return mod;
 }

 const baz = window?.foo?.bar?.baz;
 // ❌ -------------^

 const quux = baz ?? 'baz';
 // ❌ ------------^
 }}}

 The [https://www.npmjs.com/package/espree Espree project] (part of ESLint)
 is an actively-maintained substitute for Esprima.

 As a follow-up to #48456 (r61539) which upgraded CodeMirror to the latest
 v5 and Esprima (from 4.0.0 to 4.0.1), we can now do a better upgrade by
 using Espree instead of Esprima.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/64558>
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