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For functions, you could dump all currently-defined functions to a file such as appending to `~/.bashrc`.
```
typeset -f >> ~/.bashrc
```
Note that this specifically will display every function, regardless of where it was defined. So you would have to manually remove duplicates/unwanted entries.

You could also bother to save that output to a "full" file, and compare it to the output of a new shell.
```
bash -i -c 'typeset -f' > ~/funcs-plain
typeset -f > ~/funcs-mine
```
And then diff them for easy comparison.