For a long time now we have had the desire to improve our logging story
<https://bugzilla.mozilla.org/show_bug.cgi?id=881389>, especially from
JavaScript.
Currently we have three different methods of module-style logging in
JavaScript code: Log.sys.mjs
<https://searchfox.org/mozilla-central/source/toolkit/modules/Log.sys.mjs>,
Console.sys.mjs
<https://searchfox.org/mozilla-central/source/toolkit/modules/Console.sys.mjs>
and console.createInstance
<https://firefox-source-docs.mozilla.org/toolkit/javascript-logging.html#logging-using-the-console-web-api>.
We need to consolidate these to remove the complexity and make it easier
for the next steps.
Today we are taking the first steps - I am landing a patch
<https://bugzilla.mozilla.org/show_bug.cgi?id=1872674> that will raise
ESLint errors on new instances of Log.sys.mjs and Console.sys.mjs being
used. This is intended to stop us adding new instances where we don't
need to.
The first part of the current plan is to resolve differences between
Console.sys.mjs and console.createInstance and then remove
Console.sys.mjs <https://bugzilla.mozilla.org/show_bug.cgi?id=1430810>.
Log.sys.mjs replacement
<https://bugzilla.mozilla.org/show_bug.cgi?id=1828156> will need more
investigation as it has some additional functionality that may not be
available in the current console.createInstance.
Mark.
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