javascript - why don't these stylus hashes behave the same? -

in javascript:

// styl stylus compiler instance styl.define('passedhash', new stylus.nodes.object({   top: 0,   right: 2,   bottom: 5,   left: 20 })); 

in .styl file:

localhash = {   top: 0   right: 2   bottom: 5   left: 20 } .foobar   nodetype typeof(localhash)   padding unit(localhash['top'], 'px')   nodetype typeof(passedhash)   padding: unit(passedhash['top'], 'px') 

the compiled output becomes:

.foobar {   nodetype: 'object';   padding: 0px;   nodetype: 'object'; } 

if uncomment last line in stylus, expect padding rule written out same passedhash localhash. instead, stylus crashes:

typeerror: expected "unit" unit, got null:null 

why? compiler knows they're both objects... appear same exact object me....

well, according source of object node (https://github.com/learnboost/stylus/blob/master/lib/nodes/object.js) cannot pass js object constructor. passedhash empty , error. however, can coerce real js object stylus object using code:

styl.define('passedhash', {   top: 0,   right: 2,   bottom: 5,   left: 20 }, true); // <-- true raw coercion 

or more verbose version:

styl.define('passedhash', stylus.utils.coerceobject({   top: 0,   right: 2,   bottom: 5,   left: 20 }, true));