Bug Fixes

• fix: if the reference or floating elements are falsy/null when computePosition() is called there's an unhelpful error about getComputedStyle; there is now a proper error message in dev mode. (#1954)

• fix: the middleware array can now contain false, null, or undefined values. This enables you to pass conditional middleware inline without needing a verbose spread ...(cond ? [m()] : []) or separate statements like .push() — at least for TypeScript, as you could already filter it manually externally. (#1954)

  middleware: [
    shouldFlip && flip(),  
    arrowElement && arrow({ element: arrowElement }),
  ]