IDBOpenDBRequest.onupgradeneeded

Undocumented in source. Be warned that the author may not have intended to support it.
  1. void onupgradeneeded(Optional!(T0) onupgradeneeded)
    struct IDBOpenDBRequest
    nothrow
    void
    onupgradeneeded
    (
    T0
    )
    (
    scope auto ref Optional!(T0) onupgradeneeded
    )
  2. EventHandler onupgradeneeded()

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