Options +FollowSymLinks -MultiViews

RewriteEngine on

# Remove trailing slashes from directories.
DirectorySlash Off
RewriteCond %{REQUEST_FILENAME} -d
RewriteCond %{REQUEST_URI} !/$
RewriteCond %{REQUEST_FILENAME}/index.html -f
RewriteRule (.*) $1/index.html [L]
RewriteRule ^(.*)/$ /$1 [L,R=301]

# Remove index.html from URLs.
RewriteCond %{THE_REQUEST} \s/+(.*/)?index\.html[\s?] [NC]
RewriteRule ^(.*)index\.html$ /$1 [L,R=301]