uglify2.rb

require 'therubyracer'
require 'json'



ctx = V8::Context.new

ctx.eval(File.read('uglify/es5.js'))
ctx.eval(File.read('uglify/split.js'))
ctx.eval(File.read('uglify/uglify.js'))
ctx.eval(File.read('uglify/uglifier.js'))

puts "done loading"

  DEFAULTS = {
    # rubocop:disable LineLength
    :output => {
      :ascii_only => true, # Escape non-ASCII characterss
      :comments => :copyright, # Preserve comments (:all, :jsdoc, :copyright, :none)
      :inline_script => false, # Escape occurrences of </script in strings
      :quote_keys => false, # Quote keys in object literals
      :max_line_len => 32 * 1024, # Maximum line length in minified code
      :bracketize => false, # Bracketize if, for, do, while or with statements, even if their body is a single statement
      :semicolons => true, # Separate statements with semicolons
      :preserve_line => false, # Preserve line numbers in outputs
      :beautify => false, # Beautify output
      :indent_level => 4, # Indent level in spaces
      :indent_start => 0, # Starting indent level
      :space_colon => false, # Insert space before colons (only with beautifier)
      :width => 80, # Specify line width when beautifier is used (only with beautifier)
      :preamble => nil # Preamble for the generated JS file. Can be used to insert any code or comment.
    },
    :mangle => {
      :eval => false, # Mangle names when eval of when is used in scope
      :except => ["$super"], # Argument names to be excluded from mangling
      :sort => false, # Assign shorter names to most frequently used variables. Often results in bigger output after gzip.
      :toplevel => false, # Mangle names declared in the toplevel scope
      :properties => false # Mangle property names
    }, # Mangle variable and function names, set to false to skip mangling
    :mangle_properties => false, # Mangle property names
    :compress => {
      :sequences => true, # Allow statements to be joined by commas
      :properties => true, # Rewrite property access using the dot notation
      :dead_code => true, # Remove unreachable code
      :drop_debugger => true, # Remove debugger; statements
      :unsafe => false, # Apply "unsafe" transformations
      :conditionals => true, # Optimize for if-s and conditional expressions
      :comparisons => true, # Apply binary node optimizations for comparisons
      :evaluate => true, # Attempt to evaluate constant expressions
      :booleans => true, # Various optimizations to boolean contexts
      :loops => true, # Optimize loops when condition can be statically determined
      :unused => true, # Drop unreferenced functions and variables
      :hoist_funs => true, # Hoist function declarations
      :hoist_vars => false, # Hoist var declarations
      :if_return => true, # Optimizations for if/return and if/continue
      :join_vars => true, # Join consecutive var statements
      :cascade => true, # Cascade sequences
      :collapse_vars => false, # Collapse single-use var and const definitions when possible.
      :negate_iife => true, # Negate immediately invoked function expressions to avoid extra parens
      :pure_getters => false, # Assume that object property access does not have any side-effects
      :pure_funcs => nil, # List of functions without side-effects. Can safely discard function calls when the result value is not used
      :drop_console => false, # Drop calls to console.* functions
      :angular => false, # Process @ngInject annotations
      :keep_fargs => false, # Preserve unused function arguments
      :keep_fnames => false # Preserve function names
    }, # Apply transformations to code, set to false to skip
    :define => {}, # Define values for symbol replacement
    :enclose => false, # Enclose in output function wrapper, define replacements as key-value pairs
    :screw_ie8 => false, # Don't bother to generate safe code for IE8
    :source_map => false, # Generate source map
    :source_map_options => {}
  }

src = File.read(ARGV[0])
puts ctx.eval("var opts = #{JSON.generate(DEFAULTS)}; opts['source'] = #{src.inspect}; uglifier(opts)")