zsh configuration with zplug

.zshrc

export ZPLUG_HOME=/usr/local/opt/zplug

# Essential
source $ZPLUG_HOME/init.zsh

# Async for zsh, used by pure
zplug "mafredri/zsh-async", from:github, defer:0

# oh-my-zsh
zplug "lib/completion", from:oh-my-zsh
zplug "lib/directories", from:oh-my-zsh
zplug "lib/functions", from:oh-my-zsh
zplug "lib/history", from:oh-my-zsh
zplug "lib/theme-and-appearance", from:oh-my-zsh
zplug "plugins/command-not-found", from:oh-my-zsh
zplug "plugins/z", from:oh-my-zsh

# zsh-users
zplug "zsh-users/zsh-completions"
zplug "zsh-users/zsh-autosuggestions"
zplug "zsh-users/zsh-syntax-highlighting", defer:2
zplug "zsh-users/zsh-history-substring-search", defer:3

# theme
# zplug "sindresorhus/pure", use:pure.zsh, from:github, as:theme
zplug "oddhorse/bubblegum-zsh", use:bubblegum.zsh-theme, as:theme

# Install plugins if there are plugins that have not been installed
if ! zplug check --verbose; then
    printf "Install zplug plugins? [y/N]: "
    if read -q; then
        echo; zplug install
    fi
fi

zplug load