Replace indentation tabs to spaces, 4-to-2 spaces

tabToSpaceMacOSX.sh

# Reference: 
# https://stackoverflow.com/questions/11094383/how-can-i-convert-tabs-to-spaces-in-every-file-of-a-directory/11094422
# http://azaleasays.com/2014/03/07/os-x-sed-does-not-recognize-tab-character/

# "\( -iname \*.ts -o -iname \*.tsx -o -iname \*.js \)" means filtering only .ts .tsx, or .js files

# Tab to space
# * Press Ctrl+V and Tab to replace "\t" on Mac
find ./YOUR_PATH -type f \( -iname \*.ts -o -iname \*.tsx -o -iname \*.js \) -exec sed -i '' -E 's/\t/ /g' {} \;

# Convert 4 spaces to 2 spaces
find ./YOUR_PATH -type f \( -iname \*.ts -o -iname \*.tsx -o -iname \*.js \) -exec sed -i '' -E 's/  / /g' {} \;

# Remove trailing spaces
find ./YOUR_PATH -type f \( -iname \*.ts -o -iname \*.tsx -o -iname \*.js \) -exec sed -i '' 's/[[:space:]]\{1,\}$//' {} \+

# Remove trailing newline
find ./YOUR_PATH -type f \( -iname \*.ts -o -iname \*.tsx -o -iname \*.js \) -exec sed -i '' -e :a -e '/^\n*$/{$d;N;};/\n$/ba' {} \;