Tnv源码中EnvOptions类型解释

在本文中，我们将研究 T3 Env 源代码中的 EnvOptions 类型。如果您想知道 T3 Env 或 EnvOptions 是什么，

T3 Env 使用 zod 提供类型安全环境变量的验证。您使用 createEnv 函数并为您的服务器和客户端环境变量提供 zod 验证，如下例所示。

// src/env.mjs
import { createEnv } from "@t3-oss/env-nextjs";
import { z } from "zod";
export const env = createEnv({
 /*
 * Serverside Environment variables, not available on the client.
 * Will throw if you access these variables on the client.
 */
 server: {
 DATABASE_URL: z.string().url(),
 OPEN_AI_API_KEY: z.string().min(1),
 },
 /*
 * Environment variables available on the client (and server).
 *
 * ? You'll get type errors if these are not prefixed with NEXT_PUBLIC_.
 */
 client: {
 NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY: z.string().min(1),
 },
 /*
 * Due to how Next.js bundles environment variables on Edge and Client,
 * we need to manually destructure them to make sure all are included in bundle.
 *
 * ? You'll get type errors if not all variables from `server` & `client` are included here.
 */
 runtimeEnv: {
 DATABASE_URL: process.env.DATABASE_URL,
 OPEN_AI_API_KEY: process.env.OPEN_AI_API_KEY,
 NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY:
 process.env.NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY,
 },
});

此 createEnv 具有 T3 Env 源代码中定义的以下类型：

export function createEnv<
 TPrefix extends TPrefixFormat,
 TServer extends TServerFormat = NonNullable<unknown>,
 TClient extends TClientFormat = NonNullable<unknown>,
 TShared extends TSharedFormat = NonNullable<unknown>,
 const TExtends extends TExtendsFormat = [],
>(
 opts: EnvOptions<TPrefix, TServer, TClient, TShared, TExtends>,
): CreateEnv<TServer, TClient, TShared, TExtends> {
 const runtimeEnv = opts.runtimeEnvStrict ?? opts.runtimeEnv ?? process.env;

这里的函数参数是类型为EnvOptions

的opts

export type EnvOptions<
 TPrefix extends string | undefined,
 TServer extends Record<string, ZodType>,
 TClient extends Record<string, ZodType>,
 TShared extends Record<string, ZodType>,
 TExtends extends Array<Record<string, unknown>>,
> =
 | (LooseOptions<TShared, TExtends> &
 ServerClientOptions<TPrefix, TServer, TClient>)
 | (StrictOptions<TPrefix, TServer, TClient, TShared, TExtends> &
 ServerClientOptions<TPrefix, TServer, TClient>);

EnvOptions 是一个泛型类型。传递的 opts 中的服务器对象具有通用类型 - TServer extends Record

// server type is TServer that is a Record with key being string 
// and value being ZodType
server: {
 DATABASE_URL: z.string().url(),
 OPEN_AI_API_KEY: z.string().min(1),
},
// client type is TClient that is a Record with key being string 
// and value being ZodType
client: {
 NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY: z.string().min(1),
},

我在这里仅仅触及了表面，这感觉就像一个高级的 Typescript 用例，因为此 EnvOptions 类型返回：

| (LooseOptions<TShared, TExtends> &
 ServerClientOptions<TPrefix, TServer, TClient>)
| (StrictOptions<TPrefix, TServer, TClient, TShared, TExtends> &
 ServerClientOptions<TPrefix, TServer, TClient>);

查看 t3-env 源代码中的 LooseOptions 和 ServerClientOptions。

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参考文献：

1. https://github.com/t3-oss/t3-env/blob/main/packages/core/src/index.ts#L222

2. https://github.com/t3-oss/t3-env/blob/main/packages/core/src/index.ts#L183

3. https://env.t3.gg/

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