Stylus detected types — for use with `typeof()` and `is a`: http://codepen.io/thybzi/pen/MKMGoK

types.styl

/*! bool, null */
typeof()                          // -> "null"
typeof(null)                      // -> "null"
typeof(undefined)                 // -> "ident"
typeof(false)                     // -> "boolean"
typeof(no)                        // -> "ident"

/*! color */
typeof(#ff0000)                   // -> "rgba"
typeof(#f00)                      // -> "rgba"
typeof(red)                       // -> "rgba"
typeof(rgba(255, 0, 0, 0.5))      // -> "rgba"
typeof(hsla(0, 100%, 50%, 0.5))   // -> "hsla"
typeof(hsl(0, 100%, 50%))         // -> "hsla"
typeof(invert(red))               // -> "rgba"
typeof(invert(hsl(0, 100%, 50%))) // -> "rgba"

/*! ident, string, unit, call */
typeof(foobar)                    // -> "ident"
typeof('foobar')                  // -> "string"
typeof(15)                        // -> "unit"
typeof(15px)                      // -> "unit"
typeof(15deg)                     // -> "unit"
typeof(rotate(15deg))             // -> "call"
typeof(url('http://example.com')) // -> "call"

/*! function, mixin o_O, property */
foobar($a, $b)
  $a + $b
typeof(foobar)                    // -> "function"
typeof(foobar(1, 2))              // -> "unit"
foobar($a, $b)
  {$a}: $b
typeof(foobar)                    // -> "function"
typeof(foobar(1, 2))              // -> "property"

/*! object, list o_O */
typeof({ a: 42 })                 // -> "object"
typeof({ a: 42 }.a)               // -> "unit"
typeof(a, 42)                     // -> "ident"
typeof(42, a)                     // -> "unit"

/*! list variables */
a = 1px solid red
typeof(a)                         // -> "unit"
typeof(a, 42)                     // -> "unit"
b = italic 15px serif
typeof(b)                         // -> "ident"
c = (1 2 3)
typeof(c)                         // -> "unit"
typeof(a, b, c)                   // -> "unit"
typeof(b, a, c)                   // -> "ident"
typeof(c, b, a)                   // -> "unit"
b = c
typeof(b, a, c)                   // -> "unit"
b = rotate(45deg) scaleX(2)
typeof(b)                         // -> "call"
typeof(c)                         // -> "unit"
c = a, 42
typeof(c)                         // -> "unit"