Function mf

resources/vega-lite.min.js:7783–7793

(e, n, i)

    return `${a.name}[${t.stringValue(M(s))}]`;
  }
  function mf(e, n, i) {
    return _(n, (n) =>
      t.isString(n)
        ? n
        : (function (e) {
              return J(e, "param");
            })(n)
          ? ff(e, n, i)
          : nr(n),
    );
  }
  function pf(e, t, n, i) {
    ((e.encode ??= {}),
      (e.encode[t] ??= {}),