diff --git a/.zsh/configs/functions.zsh b/.zsh/configs/functions.zsh
index daaef87..6b50fcf 100644
--- a/.zsh/configs/functions.zsh
+++ b/.zsh/configs/functions.zsh
@@ -11,19 +11,6 @@ function mkd() {
    mkdir -p "$@" && cd "$@"
 }
 
-function db {
-  if [ "$1" = "refresh" ]; then
-    mysql -uroot -e "drop database $2; create database $2"
-  elif [ "$1" = "create" ]; then
-    mysql -uroot -e "create database $2"
-  elif [ "$1" = "drop" ]; then
-    mysql -uroot -e "drop database $2"
-  fi
-}
-
-is_linux() { [[ "$(uname)" == 'Linux'  ]] }
-is_macos() { [[ "$(uname)" == "Darwin" ]] }
-
 function composer() {
   docker run -u $UID -it --rm \
     -v $(pwd):/app \
diff --git a/.zsh/configs/plugins.zsh b/.zsh/configs/plugins.zsh
index 3255541..6a1243e 100644
--- a/.zsh/configs/plugins.zsh
+++ b/.zsh/configs/plugins.zsh
@@ -1,10 +1,6 @@
-if is_macos; then
-  source /usr/local/share/antigen/antigen.zsh
-elif is_linux; then
-  # antigen.zsh has been downloaded manually for now,
-  # see https://github.com/zsh-users/antigen/issues/659.
-  source $HOME/.antigen.zsh
-fi
+# antigen.zsh has been downloaded manually for now,
+# see https://github.com/zsh-users/antigen/issues/659.
+source $HOME/.antigen.zsh
 
 antigen bundle mollifier/cd-gitroot
 antigen bundle zsh-users/zsh-autosuggestions
diff --git a/.zsh/configs/tmux.zsh b/.zsh/configs/tmux.zsh
index 2077aa6..61e6ad0 100644
--- a/.zsh/configs/tmux.zsh
+++ b/.zsh/configs/tmux.zsh
@@ -1,20 +1,5 @@
-_not_inside_tmux() {
-  [[ -z "$TMUX" ]]
-}
-
-_not_inside_phpstorm() {
-  if is_macos; then
-    # VS Code returns "vscode".
-    # iTerm returns "iTerm.app".
-    # PhpStorm returns nothing.
-    [[ "$TERM_PROGRAM" != "" ]]
-  elif is_linux; then
-    [[ "$TERMINAL_EMULATOR" != "JetBrains"* ]]
-  fi
-}
-
 ensure_tmux_is_running() {
-  if _not_inside_tmux && _not_inside_phpstorm; then
+  if _not_inside_tmux; then
     tat
   fi
 }