数据转换器

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你可以对响应数据和输入参数进行序列化处理。转换器需要同时在服务器端和客户端添加。

使用 superjson

SuperJSON 允许我们在服务器和客户端之间透明地传输标准类型（如 Date、Map、Set）。这意味着你可以直接从 API 解析器返回这些类型，并在客户端直接使用它们，无需从 JSON 重新构建对象。

使用方法

1. 安装

bash
yarn add superjson

bash
yarn add superjson

2. 添加到 initTRPC

routers/router/_app.ts
ts
import { initTRPC } from '@trpc/server';
import superjson from 'superjson';
export const t = initTRPC.create({
  transformer: superjson,
});

routers/router/_app.ts
ts
import { initTRPC } from '@trpc/server';
import superjson from 'superjson';
export const t = initTRPC.create({
  transformer: superjson,
});

3. 添加到 httpLink()、wsLink() 等

在 initTRPC 对象添加转换器后，TypeScript 会引导你在需要的位置添加 transformer

createTRPCClient()：

src/app/_trpc/client.ts
ts
import { createTRPCClient } from '@trpc/client';
import type { AppRouter } from '~/server/routers/_app';
import superjson from 'superjson';
export const client = createTRPCClient<AppRouter>({
  links: [
    httpLink({
      url: 'http://localhost:3000',
      transformer: superjson,
    }),
  ],
});

src/app/_trpc/client.ts
ts
import { createTRPCClient } from '@trpc/client';
import type { AppRouter } from '~/server/routers/_app';
import superjson from 'superjson';
export const client = createTRPCClient<AppRouter>({
  links: [
    httpLink({
      url: 'http://localhost:3000',
      transformer: superjson,
    }),
  ],
});

使用 devalue

Devalue 的功能类似 superjson，但专注于提升性能和缩小负载体积，代价是降低了正文的人类可读性。

使用方法

1. 安装

bash
yarn add superjson devalue

bash
yarn add superjson devalue

2. 添加到 utils/trpc.ts

这里使用 parse 和 stringify 是因为它们能缓解 XSS 攻击。

utils/trpc.ts
ts
import { parse, stringify } from 'devalue';
// [...]
export const transformer = {
  deserialize: (object: any) => parse(object),
  serialize: (object: any) => stringify(object),
};

utils/trpc.ts
ts
import { parse, stringify } from 'devalue';
// [...]
export const transformer = {
  deserialize: (object: any) => parse(object),
  serialize: (object: any) => stringify(object),
};

3. 添加到你的 initTRPC

server/routers/_app.ts
ts
import { initTRPC } from '@trpc/server';
import { transformer } from '../../utils/trpc';
export const t = initTRPC.create({
  transformer,
});

server/routers/_app.ts
ts
import { initTRPC } from '@trpc/server';
import { transformer } from '../../utils/trpc';
export const t = initTRPC.create({
  transformer,
});

4. 添加到 httpLink()、wsLink() 等

在 initTRPC 对象添加转换器后，TypeScript 会引导你在需要的位置添加 transformer

createTRPCClient()：

src/app/_trpc/client.ts
ts
import { createTRPCClient } from '@trpc/client';
import type { AppRouter } from '~/server/routers/_app';
import { transformer } from '../../utils/trpc';
export const client = createTRPCClient<AppRouter>({
  links: [
    httpLink({
      url: 'http://localhost:3000',
      transformer,
    }),
  ],
});

src/app/_trpc/client.ts
ts
import { createTRPCClient } from '@trpc/client';
import type { AppRouter } from '~/server/routers/_app';
import { transformer } from '../../utils/trpc';
export const client = createTRPCClient<AppRouter>({
  links: [
    httpLink({
      url: 'http://localhost:3000',
      transformer,
    }),
  ],
});

为上传和下载配置不同转换器

如果转换器只需单向使用，或需要为上传/下载分别配置不同转换器（例如出于性能考虑），可以为上传和下载分别指定独立转换器。请确保在所有位置使用相同的组合转换器。

DataTransformer 接口

ts
export interface DataTransformer {
  serialize(object: any): any;
  deserialize(object: any): any;
}
interface InputDataTransformer extends DataTransformer {
  /**
   * This function runs **on the client** before sending the data to the server.
   */
  serialize(object: any): any;
  /**
   * This function runs **on the server** to transform the data before it is passed to the resolver
   */
  deserialize(object: any): any;
}
interface OutputDataTransformer extends DataTransformer {
  /**
   * This function runs **on the server** before sending the data to the client.
   */
  serialize(object: any): any;
  /**
   * This function runs **only on the client** to transform the data sent from the server.
   */
  deserialize(object: any): any;
}
export interface CombinedDataTransformer {
  /**
   * Specify how the data sent from the client to the server should be transformed.
   */
  input: InputDataTransformer;
  /**
   * Specify how the data sent from the server to the client should be transformed.
   */
  output: OutputDataTransformer;
}

ts
export interface DataTransformer {
  serialize(object: any): any;
  deserialize(object: any): any;
}
interface InputDataTransformer extends DataTransformer {
  /**
   * This function runs **on the client** before sending the data to the server.
   */
  serialize(object: any): any;
  /**
   * This function runs **on the server** to transform the data before it is passed to the resolver
   */
  deserialize(object: any): any;
}
interface OutputDataTransformer extends DataTransformer {
  /**
   * This function runs **on the server** before sending the data to the client.
   */
  serialize(object: any): any;
  /**
   * This function runs **only on the client** to transform the data sent from the server.
   */
  deserialize(object: any): any;
}
export interface CombinedDataTransformer {
  /**
   * Specify how the data sent from the client to the server should be transformed.
   */
  input: InputDataTransformer;
  /**
   * Specify how the data sent from the server to the client should be transformed.
   */
  output: OutputDataTransformer;
}