• cmd: put syscall code in OS specific files
• cmd: tweaks to bash_completion, see #441
• cmd: fix input/output directory edge cases and platform-specific operators in paths, fixes #438
• HTML: keep
  before , fixes #440
• HTML: don't keep whitespace after closing block tags with KeepWhitespace, fixes #442
• JS: fix statement list optimization when it's a list of empty statements, fixes OSSFuzz report
• JS: add support for top-level await and for class field definitions, fixes #412
• JS: improve variable declaration reordering, fixes #445
• JS: fix bug for var decl rearranging; use var renaming in decision to reorder var decls
• JS: remove unused function parameters; remove superfluous escapes in RegExp
• JS: add NoNullishOperator options, minify using nullish operator by default
• JS: fix bug for moving var decls and var renaming
• JS: const statement must have initializer
• JS: variable uses in for statement now don't interfere with declarations in for block