ClojureScript

this-as unexpectedly binds js/window when used within function with post-condition

Details

  • Type: Defect Defect
  • Status: Open Open
  • Priority: Minor Minor
  • Resolution: Unresolved
  • Affects Version/s: None
  • Fix Version/s: None
  • Component/s: None
  • Labels:
    None

Description

Adding a post-condition to any function that uses cljs.core/this-as will unexpectedly cause this-as's "this" symbol to be bound to the root object (e.g., js/window) instead.

(defn f-no-post-condition [argument]
  (this-as this
    (js/console.log argument this)))

(defn f-with-post-condition [argument]
  {:post [true]}
  (this-as this
    (js/console.log argument this)))

(def test-object
  #js {:methodNoPostcondition f-no-post-condition
       :methodWithPostcondition f-with-post-condition})

(f-with-post-condition "A") ; Correctly prints js/window
(.methodNoPostcondition test-object "B") ; Correctly prints test-object
(.methodWithPostcondition test-object "C") ; Incorrectly prints js/window

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Dates

  • Created:
    Updated: