Minify: Minify options

[boopathi]

Since it is a preset, there won't be any options passed to the minifier.

for example,

• mangle topLevel names
• mangle eval accessible bindings - don't deopt because of the presense of eval
• apply unsafe optimizations like - !== to !=, >= to <
• drop debugger & console statements or just one of them
• preserve fn args and fn name for code depending on fn.length & fn.name

etc...

How to support these as options to be passed to the minifier - when used as a CLI or a Preset?

[hzoo]

we could land https://github.com/babel/babel/pull/3331 before that (options for presets)?

[boopathi]

Yay! It's merged now - https://github.com/babel/babel/pull/3331. We could start discussion about the list of options.

mangle : bool | {
  keepFnames: bool, // overrides keepFnames in root
  eval: bool,
  blacklist: [string]
},
deadcode: bool | {
  keepFnames: bool, // overrides keepFnames in root
  keepFargs: bool,
},
keepFnames: bool, // passed to DCE and Mangler
unsafe: bool | {
  flipComparisons,
  typeConstructors,
  simplifyComparisons,
  guardedExpr,
},
evaluate: bool, // constant folding,
simplify: bool, // simplify, undef to void, 
booleans: bool,
properties: bool,

[jacott]

I would much appreciate a keepClassNames option