async function functionCallingWithSchema() {
  const model = init();
  const chat = model.startChat({
    tools: [
      {
        functionDeclarations: [
          {
            name: "getWeather",
            description: "Gets the weather of a given location",
            parameters: Schema.object({
              properties: {
                location: Schema.string({
                  description: "location of which the weather is returned",
                }),
                horoscope: Schema.string({
                  description: "user's horoscope sign",
                }),
              },
              optionalProperties: ["horoscope"],
            }),
          },
        ],
      },
    ],
  });
  const result = await chat.sendMessage(
    "\"I'm trying to decide whether to go to London or Zurich this weekend. How hot are those cities? How about Singapore? Or maybe Tokyo. I want to go somewhere not that cold but not too hot either. Suggest me."
  );
  result.response.candidates[0].content.parts.push({
    functionCall: { name: "fakeFunction", args: { fakeArg: "fakeValue" } },
  });
  result.response.candidates[0].content.parts.push({ text: "fakeText" });
  console.log(result.response.text());
  console.log(result.response.functionCalls());
  console.log(result.response);
}

{
        name: "goToItem",
        description: "Go to a player, team, league, manager or fixture page",
        parameters: Schema.object({
          type: SchemaType.OBJECT,
          properties: {
            type: Schema.string({
              description: "The type of item to go to",
              enum: ["player", "team", "league", "manager", "fixture"],
            }),
            id: Schema.number({
              description:
                "The id of the player, team, league, manager or fixture to go to",
            }),
            sport: Schema.string({
              description:
                "The sport of the player, team, league, manager or fixture to go to",
              enum: ["football"],
            }),
          },
          optionalProperties: ["sport"],
        }),
      },

{
        name: "goToItem",
        description: "Go to a player, team, league, manager or fixture page",
        parameters: {
          type: SchemaType.OBJECT,
          properties: {
            type: Schema.string({
              description: "The type of item to go to",
              enum: ["player", "team", "league", "manager", "fixture"],
            }),
            id: Schema.number({
              description:
                "The id of the player, team, league, manager or fixture to go to",
            }),
            sport: Schema.string({
              description:
                "The sport of the player, team, league, manager or fixture to go to",
              enum: ["football"],
            }),
          },
          optionalProperties: ["sport"],
        },
      }