setWindowOptions = function () {
    for (const key in options) {
      if (typeof window !== 'undefined' &&
          typeof window.texme !== 'undefined' &&
          typeof window.texme[key] !== 'undefined') {
        options[key] = window.texme[key]
      }
    }
  }
Read configuration options specified in `window.texme` and
configure TeXMe.

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