diff --git a/configs/git.sh b/configs/git.sh
index 3c7e6d2..db51b60 100644
--- a/configs/git.sh
+++ b/configs/git.sh
@@ -59,6 +59,7 @@ if bacon_defined BACON_PROMPT_PS1_LAYOUT && bacon_definedf bacon_promptc; then
         brch="${brchi[1]//..*/}"
         # check whether the local repo is different from remote tracked repo
         [[ -n ${brchi[2]} && ${brchi[*]:2} =~ '[' ]] && brch+="${trki[${brchi[2]#[}]}${brchi[3]%]}"
+        local c
         local tmp=()
         for c in "${bstat[@]:1}"; do
             # prevent special chars to be expand
diff --git a/configs/pip.sh b/configs/pip.sh
index 20c3b34..3c101bb 100644
--- a/configs/pip.sh
+++ b/configs/pip.sh
@@ -7,6 +7,7 @@ hash pip &>/dev/null || return 1
 bacon_export pip
 
 pip_upgrade() {
+    local pkg
     for pkg in $(pip list --outdate --format legacy | awk '{print $1}'); do
         sudo pip install --upgrade "${pkg}"
     done
diff --git a/lib/bacon-async.sh b/lib/bacon-async.sh
index 3242046..bcab5c5 100644
--- a/lib/bacon-async.sh
+++ b/lib/bacon-async.sh
@@ -42,6 +42,7 @@ bacon_async_add() {
 bacon_async_del() {
     [[ $# == 1 ]] || return 1
     local jobs=()
+    local j
     [[ $# == 0 ]] && jobs=("${!BACON_ASYNC_RUN[@]}") || jobs=("$@")
     for j in "${jobs[@]}"; do
         [[ -n $j && -n ${BACON_ASYNC_RUN[$j]} ]] && unset BACON_ASYNC_RUN["$j"]
@@ -81,6 +82,7 @@ bacon_async_run() {
 bacon_async_start() {
     [[ -n $BACON_ASYNC_MQ ]] || bacon_async_mq_init || return 1
     local jobs=()
+    local j
     [[ $# == 0 ]] && jobs=("${!BACON_ASYNC_RUN[@]}") || jobs=("$@")
     for j in "${jobs[@]}"; do
         if [[ -n ${BACON_ASYNC_RUN[$j]} ]]; then
@@ -91,6 +93,7 @@ bacon_async_start() {
 
 bacon_async_stop() {
     local jobs=()
+    local j
     [[ $# == 0 ]] && jobs=("${!BACON_ASYNC_JQ[@]}") || jobs=("$@")
     for j in "${jobs[@]}"; do
         if [[ -n ${BACON_ASYNC_JQ[$j]} ]] && bacon_is_running "${BACON_ASYNC_JQ[$j]}"; then
@@ -102,6 +105,7 @@ bacon_async_stop() {
 
 bacon_async_wait() {
     local pids=() runs=()
+    local p
     [[ $# == 0 ]] && pids=("${BACON_ASYNC_JQ[@]}") || pids=("$@")
     for p in "${pids[@]}"; do
         [[ -n $p && $p =~ [0-9]+ ]] && bacon_is_running "$p" && runs+=("$p")
diff --git a/lib/bacon-main.sh b/lib/bacon-main.sh
index f638c39..bb7bc68 100644
--- a/lib/bacon-main.sh
+++ b/lib/bacon-main.sh
@@ -9,6 +9,7 @@ export BACON_MAIN_ABS_DIR="$(dirname "$BACON_MAIN_ABS_SRC")"
 
 bacon_init() {
     local BACON_LIB_DIR=("$BACON_MAIN_ABS_DIR")
+    local c
     for c in "$@"; do
         bacon_load "${c}.sh" || true
     done
diff --git a/lib/bacon-precmd.sh b/lib/bacon-precmd.sh
index a2cf32d..ead6a87 100644
--- a/lib/bacon-precmd.sh
+++ b/lib/bacon-precmd.sh
@@ -9,6 +9,7 @@ declare -ga BACON_PRECMD_TRAP=()
 declare -g  BACON_PRECMD_TRAP_SIG="${BACON_PRECMD_TRAP_SIG:-}"
 
 bacon_precmd_handler() {
+    local cmd
     for cmd in "${BACON_PRECMD_TRAP[@]}"; do
         eval "$cmd"
     done
diff --git a/lib/bacon-prompt.sh b/lib/bacon-prompt.sh
index 391307f..cd73f31 100644
--- a/lib/bacon-prompt.sh
+++ b/lib/bacon-prompt.sh
@@ -36,7 +36,7 @@ bacon_prompt_location() {
 
 bacon_prompt_counter() {
     local -A counters
-    local str=''
+    local str='' cnt
     for cnt in "${BACON_PROMPT_COUNTERS[@]}"; do
         # shellcheck disable=SC2155
         local nr="$(eval "$cnt")"
@@ -57,7 +57,7 @@ bacon_prompt_dollar() {
 }
 
 bacon_prompt_ps1() {
-    ps1=
+    local ps1 layout
     for layout in "${BACON_PROMPT_PS1_LAYOUT[@]}"; do
         bacon_definedf "$layout" && ps1+="$($layout)"
     done
diff --git a/lib/bacon-utils.sh b/lib/bacon-utils.sh
index 1b92a53..a88f285 100644
--- a/lib/bacon-utils.sh
+++ b/lib/bacon-utils.sh
@@ -20,6 +20,7 @@ bacon_has_map() {
 # Assigns the selected set of escape mappings to the given associative array names.
 bacon_color_init() {
     local -a fg_clrs bg_clrs msc
+    local x
     fg_clrs=(black red green yellow blue magenta cyan grey darkgrey ltred ltgreen ltyellow ltblue ltmagenta ltcyan white)
     bg_clrs=($(IFS=,; eval "echo bg_{${fg_clrs[*]}}"))
     msc=(sgr0 bold dim smul blink rev invis)
@@ -53,7 +54,7 @@ bacon_color_init() {
 bacon_color_init --setaf BACON_COLOR --setab BACON_COLOR --misc BACON_COLOR
 
 bacon_set_color() {
-    local color
+    local color c
     for c in "$@"; do
         bacon_has_map BACON_COLOR "$c" && color+="${BACON_COLOR[$c]}"
     done
@@ -255,7 +256,7 @@ bacon_popts() {
     shift 4
     local -a soa=() loa=()
     local -A som=() lom=()
-    local sos los tmp m n
+    local sos los tmp o m n
 
     # construct optstrings
     for o in "${!__optstr[@]}"; do
@@ -311,6 +312,7 @@ bacon_require_base() {
     local cmd="$1"
     local msg="$2"
     shift 2
+    local obj
     for obj in "$@"; do
         "$cmd" "$obj" || miss+=("$obj")
     done
@@ -417,6 +419,7 @@ bacon_filter() {
     local -n __array="$1"
     local p="$2"
     shift 2
+    local arg
     for arg in "$@"; do
         [[ $arg =~ $p ]] && __array+=("$arg") || true
     done
@@ -431,6 +434,7 @@ bacon_map() {
     local -n __array="$1"
     local func="$2"
     shift 2
+    local i
     __array+=("$@")
     for i in "${__array[@]}"; do
         "$func" "__array[$i]"