makeSchemaClass

src/index.ts

@@ -0,0 +1 @@
+export * from "./makeSchemaClass"

src/makeSchemaClass.ts

@@ -0,0 +1,48 @@
+import { Class } from "type-fest"
+import { z } from "zod"
+import { StaticMembers, zodObjectRemoveDefaults } from "./util"
+
+
+export function makeSchemaClass<
+    SchemaWithDefaultValuesT           extends z.ZodRawShape,
+    SchemaWithDefaultValuesUnknownKeys extends z.UnknownKeysParam,
+    SchemaWithDefaultValuesCatchall    extends z.ZodTypeAny,
+    SchemaWithDefaultValuesOutput      extends SchemaWithDefaultValuesInput,  // TODO: apply "StripSchemaInputDefaults"?
+    SchemaWithDefaultValuesInput       extends {},
+>(
+    {
+        schema: schemaWithDefaultValues
+    }: {
+        schema: z.ZodObject<
+            SchemaWithDefaultValuesT,
+            SchemaWithDefaultValuesUnknownKeys,
+            SchemaWithDefaultValuesCatchall,
+            SchemaWithDefaultValuesOutput,
+            SchemaWithDefaultValuesInput
+        >
+    }
+) {
+
+    const schema = zodObjectRemoveDefaults(schemaWithDefaultValues)
+
+    class SchemaObject {
+        static readonly schema = schema
+        static readonly schemaWithDefaultValues = schemaWithDefaultValues
+
+        readonly schema = schema
+        readonly schemaWithDefaultValues = schemaWithDefaultValues
+
+        constructor(data: z.output<typeof schema>) {
+            Object.assign(this, data)
+        }
+    }
+
+    return SchemaObject as (
+        Class<
+            SchemaObject & z.output<typeof schema>,
+            ConstructorParameters<typeof SchemaObject>
+        > &
+        StaticMembers<typeof SchemaObject>
+    )
+
+}

src/tests.ts

@@ -0,0 +1,14 @@
+import { z } from "zod"
+import { makeSchemaClass } from "./makeSchemaClass"
+
+
+const UserSchema = z.object({
+    /** User ID */
+    id: z.bigint().default(-1n)
+})
+
+
+const UserSchemaObject = makeSchemaClass({ schema: UserSchema })
+
+const user = new UserSchemaObject({ id: 1n })
+user.id

src/util.ts

@@ -3,6 +3,15 @@ import { mapValues } from "lodash-es"
 import { z } from "zod"
 
 
+/**
+ * Represents the static members of a class.
+ * @template C - The class type.
+ */
+export type StaticMembers<C> = {
+    [Key in keyof C as Key extends "prototype" ? never : Key]: C[Key]
+}
+
+
 /**
  * Removes default values from a ZodObject schema and returns a new schema.
  *