Firebase function 에서 firestore 접근하기

const admin = require("firebase-admin");


admin
    .firestore()
    .collection("cities")
    .doc("LA")
    .set({
      name: "Los Angeles",
      state: "CA",
      country: "USA"
    })
    .then(function () {
      console.log("Document successfully written!");
    })
    .catch(function (error) {
      console.error("Error writing document: ", error);
    });