1917973 - Falsy values on watch list are displayed as "(unavailable)" text which consufses

Status: NEW

(DevTools :: Debugger, defect, P2)

Description

[esprigde]

Attachment: aaaaaaaaaaaaaaaaaaaaaaaaaaaa.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:130.0) Gecko/20100101 Firefox/130.0

Steps to reproduce:

I added few different values to evaluate and watch into debuggers watch list, some of them have falsy values (0,false,''`)

Actual results:

Falsy values on watch list are displayed as (unavailable) text which confuses developer

Expected results:

These values should be displayed with original values (number 0, boolean false, string '') and not evaluable (due to error) values need to show as (unavailable)

Comment 1

[Julian Descottes [:jdescottes]]

Interestingly, null and undefined don't show up as unavailable.

Issue might be coming from https://searchfox.org/mozilla-central/rev/3b59c739df66574d94022a684596845cd05e7c65/devtools/client/debugger/src/utils/expressions.js#48-50

In general, it's not clear when "unavailable" makes sense, as opposed to showing a clearer value (even if there is an error, we could at least show the error name?)

Comment 2

[esprigde]

This bug still lives and make debugging a lot heavier because of you cant be sure what value is hidden under text "unavailable"