fix: dist files not working correctly with node resolutions (#169)

Author: marcalexiei

package.json

@@ -3,16 +3,22 @@
   "version": "5.0.0",
   "description": "Zod Type Provider for Fastify@5",
   "type": "module",
-  "main": "./dist/cjs/index.js",
+  "main": "./dist/cjs/index.cjs",
   "module": "./dist/esm/index.js",
+  "types": "./dist/cjs/index.d.cts",
   "exports": {
-    "require": "./dist/cjs/index.js",
-    "import": "./dist/esm/index.js"
+    "require": {
+      "types": "./dist/cjs/index.d.cts",
+      "default": "./dist/cjs/index.cjs"
+    },
+    "default": {
+      "types": "./dist/esm/index.d.ts",
+      "default": "./dist/esm/index.js"
+    }
   },
-  "types": "./dist/cjs/index.d.ts",
   "files": ["README.md", "LICENSE", "dist"],
   "scripts": {
-    "build": "tsc -p tsconfig.cjs.json && tsc -p tsconfig.esm.json",
+    "build": "vite build",
     "test:coverage": "vitest --coverage",
     "test:ci": "npm run build && npm run typescript && npm run test:coverage",
     "lint": "biome check . && tsc --noEmit",
@@ -50,6 +56,7 @@
     "oas-validator": "^5.0.8",
     "tsd": "^0.32.0",
     "typescript": "^5.8.3",
+    "unplugin-isolated-decl": "^0.14.3",
     "vitest": "^3.2.2",
     "zod": "^3.25.56"
   },

src/core.ts

@@ -92,7 +92,7 @@ export const createJsonSchemaTransform = ({
   }
 }
 
-export const jsonSchemaTransform = createJsonSchemaTransform({})
+export const jsonSchemaTransform: SwaggerTransform<Schema> = createJsonSchemaTransform({})
 
 type CreateJsonSchemaTransformObjectOptions = {
   schemaRegistry?: z.core.$ZodRegistry<{ id?: string | undefined }>
@@ -132,7 +132,7 @@ export const createJsonSchemaTransformObject =
     } as ReturnType<SwaggerTransformObject>
   }
 
-export const jsonSchemaTransformObject = createJsonSchemaTransformObject({})
+export const jsonSchemaTransformObject: SwaggerTransformObject = createJsonSchemaTransformObject({})
 
 export const validatorCompiler: FastifySchemaCompiler<z.ZodTypeAny> =
   ({ schema }) =>
@@ -177,7 +177,8 @@ export const createSerializerCompiler =
     return JSON.stringify(result.data, options?.replacer)
   }
 
-export const serializerCompiler = createSerializerCompiler({})
+export const serializerCompiler: ReturnType<typeof createSerializerCompiler> =
+  createSerializerCompiler({})
 
 /**
  * FastifyPluginCallbackZod with Zod automatic type inference

src/errors.ts

@@ -1,25 +1,37 @@
-import createError from '@fastify/error'
+import createError, { type FastifyErrorConstructor } from '@fastify/error'
 import type { FastifyError } from 'fastify'
 import type { FastifySchemaValidationError } from 'fastify/types/schema'
 import type { z } from 'zod/v4'
 
-export const InvalidSchemaError = createError<[string]>(
-  'FST_ERR_INVALID_SCHEMA',
-  'Invalid schema passed: %s',
-  500,
-)
+export const InvalidSchemaError: FastifyErrorConstructor<
+  {
+    code: string
+  },
+  [string]
+> = createError<[string]>('FST_ERR_INVALID_SCHEMA', 'Invalid schema passed: %s', 500)
 
-const ZodFastifySchemaValidationErrorSymbol = Symbol.for('ZodFastifySchemaValidationError')
+const ZodFastifySchemaValidationErrorSymbol: symbol = Symbol.for('ZodFastifySchemaValidationError')
 
 export type ZodFastifySchemaValidationError = FastifySchemaValidationError & {
   [ZodFastifySchemaValidationErrorSymbol]: true
 }
 
-export class ResponseSerializationError extends createError<[{ cause: z.ZodError }]>(
+const ResponseSerializationBase: FastifyErrorConstructor<
+  {
+    code: string
+  },
+  [
+    {
+      cause: z.ZodError
+    },
+  ]
+> = createError<[{ cause: z.ZodError }]>(
   'FST_ERR_RESPONSE_SERIALIZATION',
   "Response doesn't match the schema",
   500,
-) {
+)
+
+export class ResponseSerializationError extends ResponseSerializationBase {
   cause!: z.ZodError
 
   constructor(

src/zod-to-json.ts

@@ -29,7 +29,9 @@ const getOverride = (
   }
 }
 
-const deleteInvalidProperties = (schema: z.core.JSONSchema.BaseSchema) => {
+const deleteInvalidProperties: (
+  schema: z.core.JSONSchema.BaseSchema,
+) => Omit<z.core.JSONSchema.BaseSchema, 'id' | '$schema'> = (schema) => {
   const object = { ...schema }
 
   delete object.id
@@ -38,11 +40,11 @@ const deleteInvalidProperties = (schema: z.core.JSONSchema.BaseSchema) => {
   return object
 }
 
-export const zodSchemaToJson = (
+export const zodSchemaToJson: (
   zodSchema: z.ZodType,
   registry: z.core.$ZodRegistry<{ id?: string }>,
   io: 'input' | 'output',
-) => {
+) => ReturnType<typeof deleteInvalidProperties> = (zodSchema, registry, io) => {
   const result = z.toJSONSchema(zodSchema, {
     io,
     unrepresentable: 'any',
@@ -61,10 +63,10 @@ export const zodSchemaToJson = (
   return jsonSchema
 }
 
-export const zodRegistryToJson = (
+export const zodRegistryToJson: (
   registry: z.core.$ZodRegistry<{ id?: string }>,
   io: 'input' | 'output',
-) => {
+) => Record<string, z.core.JSONSchema.BaseSchema> = (registry, io) => {
   const result = z.toJSONSchema(registry, {
     io,
     unrepresentable: 'any',

tsconfig.cjs.json

@@ -6,6 +6,7 @@
       "esModuleInterop": true,
       "declaration": true,
       "strict": true,
+      "isolatedDeclarations": true
     },
-    "exclude": ["./node_modules", "types/**/*.test-d.ts", "test", "dist", "vitest.config.mts"]
+    "exclude": ["./node_modules", "types/**/*.test-d.ts", "test", "dist", "vite.config.ts", "vitest.config.ts"]
   }  

tsconfig.esm.json

@@ -0,0 +1,25 @@
+import { defineConfig } from "vite";
+import UnpluginIsolatedDecl from 'unplugin-isolated-decl/vite'
+
+export default defineConfig({
+  build: {
+    lib: { entry: "src/index.ts",},
+    outDir: "dist",
+    emptyOutDir: true,
+    minify: false,
+    sourcemap: true,
+    rollupOptions: {
+      external: ["fastify", "zod/v4", "@fastify/swagger", "@fastify/error"],
+      output: [{
+        preserveModules: true,
+        entryFileNames: 'cjs/[name].cjs',
+        format: 'commonjs'
+      }, {
+        preserveModules: true,
+        entryFileNames: 'esm/[name].js',
+        format: 'es'
+      }],
+    },
+  },
+  plugins: [UnpluginIsolatedDecl()],
+});