Support Superstruct (#3)

* feat: add superstruct support

* docs: change body validation

README.md

@@ -226,7 +226,7 @@ export default middleware<NextApiRequest, NextApiResponse>()
 
 ## Body Validation
 
-This adapter validates the request body with zod or yup.
+This adapter validates the request body with zod, yup, superstruct or custom validators.
 
 ```typescript
 export function withValidatedBody<TReq extends { body?: unknown }, TRes extends ServerResponse, T>(parser: Parser<T>)

package.json

@@ -57,6 +57,7 @@
     "prettier": "^2.8.8",
     "rimraf": "^5.0.0",
     "semantic-release": "^21.0.2",
+    "superstruct": "^1.0.3",
     "typescript": "^5.0.4",
     "vitest": "^0.31.0",
     "yup": "^1.1.1",

src/adapters/validation-adapter.ts

@@ -15,6 +15,13 @@ interface YupLike<T> {
   cast: (value: unknown) => T
 }
 
+/**
+ * Parse the body of a request using Superstruct.
+ */
+interface SuperstructLike<T> {
+  create: (value: unknown) => T
+}
+
 /**
  * Parse the body of a request using a function.
  */
@@ -23,7 +30,7 @@ type FunctionalParser<T> = (value: unknown) => T
 /**
  * A parser that can be used to parse the body of a request.
  */
-type Parser<T> = ZodLike<T> | YupLike<T> | FunctionalParser<T>
+type Parser<T> = ZodLike<T> | YupLike<T> | SuperstructLike<T> | FunctionalParser<T>
 
 /**
  * Convert a parser to a functional parser.
@@ -35,6 +42,8 @@ function uniformParser<T>(parser: Parser<T>): FunctionalParser<T> {
     return (value: unknown) => parser.parse(value)
   } else if ("cast" in parser) {
     return (value: unknown) => parser.cast(value)
+  } else if ("create" in parser) {
+    return (value: unknown) => parser.create(value)
   } else if (typeof parser === "function") {
     return parser
   }

test/adapters/validation-adapter.test.ts

@@ -1,6 +1,7 @@
 import { describe, it, vitest } from "vitest"
 import { z } from "zod"
 import yup from "yup"
+import superstruct from "superstruct"
 import { middleware, withValidatedBody } from "../../src"
 import { ServerResponse } from "http"
 
@@ -47,6 +48,27 @@ describe("withValidatedBody", () => {
     })
   })
 
+  it("superstruct", async ({ expect }) => {
+    const res = {
+      setHeader: vitest.fn(),
+      end: vitest.fn(),
+    }
+
+    const superstructSchema = superstruct.object({
+      name: superstruct.string(),
+    })
+
+    const f = middleware<{ body: unknown }, ServerResponse>()
+      .pipe(withValidatedBody(superstructSchema))
+      .pipe((req, res, next, body) => body)
+
+    const result = await f({ body: { name: "abc" } }, res as never)
+
+    expect(result).toEqual({
+      name: "abc",
+    })
+  })
+
   it("zod invalid", async ({ expect }) => {
     const res = {
       setHeader: vitest.fn(),
@@ -87,6 +109,26 @@ describe("withValidatedBody", () => {
     expect(res.statusCode).toEqual(400)
   })
 
+  it("superstruct invalid", async ({ expect }) => {
+    const res = {
+      setHeader: vitest.fn(),
+      statusCode: 0,
+      end: vitest.fn(),
+    }
+
+    const schema = superstruct.object({
+      name: superstruct.string(),
+    })
+
+    const f = middleware<{ body: unknown }, ServerResponse>()
+      .pipe(withValidatedBody(schema))
+      .pipe((req, res, next, body) => body)
+
+    await f({ body: { age: "heheheha" } }, res as never)
+
+    expect(res.statusCode).toEqual(400)
+  })
+
   it("custom", async ({ expect }) => {
     const res = {
       setHeader: vitest.fn(),