Ctags: javascript: Got "ctags: Warning: ignoring null tag"

Is there any update on this?

Or am I doing something wrong? The code I'm trying to tag is Javascript/React :)

Apparently it is related to Object destructuring like:

    const { name, email } = user;

I have not inspected the warning well.
However, the input you gave looks valid as I tested the input on node command
I would like you to open a new issue for the input.
If you are good at JavaScript, I would like to know the specification as reference.
See https://github.com/universal-ctags/ctags/issues/1949#issuecomment-457829914 how I struggled.

const { name, email } = user;

name and email should be tagged well.

[yamato@slave]~% node
> var user = {name: 'a', email: 'b'}
var user = {name: 'a', email: 'b'}
undefined
> const { name, email } = user;
const { name, email } = user;
undefined
> name
name
'a'

If you are good at JavaScript, I would like to know the specification as reference.

Not sure if I got your question but the specification for the Object Destructuring is on the ECMAScript specification:
https://www.ecma-international.org/ecma-262/6.0/#sec-destructuring-assignment

:)

Thanks. That is what I need.

Why does this issue not be addressed? I've got the same problem.

Thanks. That is what I need.

how did you remove the warning?

how did you remove the warning?

I didn't remove the warning.

how did you remove the warning?

I didn't remove the warning.

well, I've got the same issue, {A, B} = some_obj can be parsed correctly by ctags.

Looks like no one is going to fix this issue

Looks like no one is going to fix this issue

For the destructural binding, I tried once.

[jet@living]/tmp% cd /tmp
cd /tmp
[jet@living]/tmp% git clone https://github.com/masatake/ctags.git
git clone https://github.com/masatake/ctags.git
Cloning into 'ctags'...
...
[jet@living]/tmp% cd ctags
cd ctags
[jet@living]/tmp/ctags% git checkout  origin/js-destructual-binding 
git checkout  origin/js-destructual-binding 
Note: switching to 'origin/js-destructual-binding'.
...
HEAD is now at 4eeac5b9 JavaScript: support more forms of destructuring assignments
[jet@living]/tmp/ctags% bash ./autogen.sh
bash ./autogen.sh
+ type autoreconf
...
optlib2c: translating optlib/inko.ctags to optlib/inko.c
+ ./misc/optlib2c optlib/inko.ctags
+ exit 0
[jet@living]/tmp/ctags% ./configure
./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
...
config.status: creating config.h
config.status: executing depfiles commands
[jet@living]/tmp/ctags% make -j 9
make -j 9
REPOINFO   main/repoinfo.h
make  all-recursive
make[1]: Entering directory '/tmp/ctags'
make[2]: Entering directory '/tmp/ctags'
...
  AR       libctags.a
  CCLD     ctags
  CCLD     mini-geany
make[2]: Leaving directory '/tmp/ctags'
make[1]: Leaving directory '/tmp/ctags'
[jet@living]/tmp/ctags% cat /tmp/bar.js 
cat /tmp/bar.js 
const { name, email } = user;

[jet@living]/tmp/ctags% ./ctags -o - /tmp/bar.js 
./ctags -o - /tmp/bar.js 
email   /tmp/bar.js /^const { name, email } = user;$/;" C
name    /tmp/bar.js /^const { name, email } = user;$/;" C

The branch introduces so many changes.
So merging it to the master branch we use daily needs more consideration.

this[0] = function() {};

In this case, ctags says nothing.

{
    this[0] = function() {};
}

In this case, I got a warning. This will be an important hint fix for the original input.

Looks like no one is going to fix this issue

For the destructural binding, I tried once.

[jet@living]/tmp% cd /tmp
cd /tmp
[jet@living]/tmp% git clone https://github.com/masatake/ctags.git
git clone https://github.com/masatake/ctags.git
Cloning into 'ctags'...
...
[jet@living]/tmp% cd ctags
cd ctags
[jet@living]/tmp/ctags% git checkout  origin/js-destructual-binding 
git checkout  origin/js-destructual-binding 
Note: switching to 'origin/js-destructual-binding'.
...
HEAD is now at 4eeac5b9 JavaScript: support more forms of destructuring assignments
[jet@living]/tmp/ctags% bash ./autogen.sh
bash ./autogen.sh
+ type autoreconf
...
optlib2c: translating optlib/inko.ctags to optlib/inko.c
+ ./misc/optlib2c optlib/inko.ctags
+ exit 0
[jet@living]/tmp/ctags% ./configure
./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
...
config.status: creating config.h
config.status: executing depfiles commands
[jet@living]/tmp/ctags% make -j 9
make -j 9
REPOINFO   main/repoinfo.h
make  all-recursive
make[1]: Entering directory '/tmp/ctags'
make[2]: Entering directory '/tmp/ctags'
...
  AR       libctags.a
  CCLD     ctags
  CCLD     mini-geany
make[2]: Leaving directory '/tmp/ctags'
make[1]: Leaving directory '/tmp/ctags'
[jet@living]/tmp/ctags% cat /tmp/bar.js 
cat /tmp/bar.js 
const { name, email } = user;

[jet@living]/tmp/ctags% ./ctags -o - /tmp/bar.js 
./ctags -o - /tmp/bar.js 
email /tmp/bar.js /^const { name, email } = user;$/;" C
name  /tmp/bar.js /^const { name, email } = user;$/;" C

The branch introduces so many changes.
So merging it to the master branch we use daily needs more consideration.

I've tried it, a very good solution, thanks.
Did you made these branches, so many patches.

Hi

Although this is not contributing to the issue in ctags itself, I created a ctags shell function that ignores this specific warning for JavaScript files: https://gist.github.com/dietrichm/9e518549fd609173182ce36ac4726df2

Just in case you frequently run ctags on the command line and want to hide the warnings until the issue is fixed.

Dietrich

I also get this warning with array destructuring :
const [lang, setLang] = useState("en")

@Strangehill, could you add the same comment to #1112?

of course

Thank you.