What are the types in this TypeScript function doing?

export function partition<T, A extends T, B extends T>(
  items: T[],
  predicate: (item: T) => item is A
): [A[], B[]] {
  const [truthy, falsy] = [[], []] as [A[], B[]];

  for (const item of items) {
    if (predicate(item)) {
      truthy.push(item);
    } else {
      falsy.push(item as B);
    }
  }

  return [truthy, falsy];
}

system
is tipscript fnction main prakaar kya hai?

niryaat samaaroh vibhaajan <t, a vistaarit t, b vistaarit t> ((
  item: tii [],
  vidhey: (item: t) => item ek he
): [e [], bi []] {
  const [truthy, flasy] = [[], []] ke rup main [a [], b []];

  ke liye (item kaa cast item) {
    if (vidhey (item)) {
      truthy.push (item);
    } anya {
      falsy.push (b ke rup main item);
    }
  }

  vaapasi [satya, juthi];
}
user
vibhaajan fnction do parameter letaa he: item kaa ek sarani jiskaa prakaar tip parameter tii he, or ek vidhey fnction jo tip tii kaa ek item letaa he or ek bulian detaa he jo yah darshata he ki kya item fnction ke andar tip parameter e ke liye asin karne yogya he,do saraniyan banaai jaati hai;Truthy, jo un vastuon kaa ek sarani he, jinka prakaar prakaar kaa parameter A, or flasy he, jo ki tip parameter B kaa ek sarani he. yah ek do-tatv tapal detaa he jisamen truti sarani se milakar pehle tatv or galat sarani ke rup main sarani he.doosraa.
assistant
<|system|>
</s>
<|user|>
is tipscript fnction main prakaar kya hai?

niryaat samaaroh vibhaajan <t, a vistaarit t, b vistaarit t> ((
  item: tii [],
  vidhey: (item: t) => item ek he
): [e [], bi []] {
  const [truthy, flasy] = [[], []] ke rup main [a [], b []];

  ke liye (item kaa cast item) {
    if (vidhey (item)) {
      truthy.push (item);
    } anya {
      falsy.push (b ke rup main item);
    }
  }

  vaapasi [satya, juthi];
}</s>
<|assistant|>
vibhaajan fnction do parameter letaa he: item kaa ek sarani jiskaa prakaar tip parameter tii he, or ek vidhey fnction jo tip tii kaa ek item letaa he or ek bulian detaa he jo yah darshata he ki kya item fnction ke andar tip parameter e ke liye asin karne yogya he,do saraniyan banaai jaati hai;Truthy, jo un vastuon kaa ek sarani he, jinka prakaar prakaar kaa parameter A, or flasy he, jo ki tip parameter B kaa ek sarani he. yah ek do-tatv tapal detaa he jisamen truti sarani se milakar pehle tatv or galat sarani ke rup main sarani he.doosraa.</s>
