feat: add InferDataPack, InferDataUnpack helpers

Author: kravetsone

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@gramio/callback-data",
-	"version": "0.0.8",
+	"version": "0.0.9",
 	"main": "dist/index.js",
 	"devDependencies": {
 		"@biomejs/biome": "^1.9.4",

src/index.ts

@@ -316,3 +316,16 @@ export class CallbackData<
 		return this as any;
 	}
 }
+
+export type InferDataPack<T extends CallbackData> = T extends CallbackData<
+	infer SchemaType,
+	infer SchemaTypeInput
+>
+	? SchemaTypeInput
+	: never;
+export type InferDataUnpack<T extends CallbackData> = T extends CallbackData<
+	infer SchemaType,
+	infer SchemaTypeInput
+>
+	? SchemaType
+	: never;

tests/types/index.ts

@@ -1,5 +1,9 @@
 import { expectTypeOf } from "expect-type";
-import { CallbackData } from "../../src/index.ts";
+import {
+	CallbackData,
+	type InferDataPack,
+	type InferDataUnpack,
+} from "../../src/index.ts";
 
 const callbackDataString = new CallbackData("test").string("name", {
 	optional: true,
@@ -118,3 +122,10 @@ const defaultUnpackedDataWithDefaults = defaultCallbackData.unpack(
 expectTypeOf(defaultUnpackedDataWithDefaults).toEqualTypeOf<{
 	isActive: boolean;
 }>();
+
+{
+	const cd = new CallbackData("test").boolean("test", { default: true });
+
+	expectTypeOf<InferDataPack<typeof cd>>().toEqualTypeOf<{ test?: boolean }>();
+	expectTypeOf<InferDataUnpack<typeof cd>>().toEqualTypeOf<{ test: boolean }>();
+}