iTerm/zsh not reading .bashrc OR .bash_profile

In ~/.bash_profile I have :

if [ -f ~/.bashrc ]; then
    source ~/.bashrc
fi

In ~/.bashrc I have some aliases

When I load a new iTerm window, my aliases do not work. If I source ~/.bashrc they work. If I source ~.bash_profile they work.

Isn't at least one of these supposed to be sourced automatically?

What might be causing it not to work properly?

The answer is simple, almost evident in the question. Here's why:

The shell zsh is not bash, it is a different shell. zsh will not use the default files built for bash: .bashrc or .bash_profile. These two files are startup configuration files for bash. zsh has its own startup configuration files.

You can find out more about them here on the zsh intro page:

There are five startup files that zsh will read commands from:

$ZDOTDIR/.zshenv
$ZDOTDIR/.zprofile
$ZDOTDIR/.zshrc
$ZDOTDIR/.zlogin
$ZDOTDIR/.zlogout

You had mentioned your aliases don't work, to fix this, apply your aliases here like so:

~/.zshrc

alias sz='source ~/.zshrc'     # Easily source your ~/.zshrc file.
alias ls='pwd; ls --color'     # Alias 'ls' to: pwd + ls + color.

If you are using zsh then to force source .bash_profile

in ~/.zshrc add the line below

source ~/.bash_profile

P.S - I havent investigated whether this can cause any problem.

Copy the lines from ~/.bash_profile to ~/.zshrc

cat ~/.bash_profile >> ~/.zshrc

And open a new terminal tab/window or use source ~/.zshrc