feat: support groups in groups

package.json

@@ -60,7 +60,7 @@
 		"quick-lru": "^6.1.1"
 	},
 	"devDependencies": {
-		"@prismicio/client": "^7.5.0",
+		"@prismicio/client": "^7.6.0-alpha.0",
 		"@prismicio/mock": "^0.3.6",
 		"@size-limit/preset-small-lib": "^8.2.6",
 		"@trivago/prettier-plugin-sort-imports": "^4.1.1",

src/lib/buildFieldProperties.ts

@@ -1,4 +1,7 @@
-import type { CustomTypeModelField } from "@prismicio/client";
+import {
+	type CustomTypeModelField,
+	CustomTypeModelFieldType,
+} from "@prismicio/client";
 import { source, stripIndent } from "common-tags";
 
 import { AuxiliaryType, FieldConfigs, FieldPath } from "../types";
@@ -291,10 +294,25 @@ function buildFieldProperty(
 			});
 			contentTypeNames.push(itemName);
 
-			code = addLine(
-				`${name}: prismic.GroupField<Simplify<${itemName}>>;`,
-				code,
+			const indexOfFirstGroupInPath = path.findIndex(
+				(pathElement) =>
+					pathElement.model &&
+					"type" in pathElement.model &&
+					pathElement.model.type === CustomTypeModelFieldType.Group,
 			);
+			const isNestedGroup = indexOfFirstGroupInPath < path.length - 1;
+
+			if (isNestedGroup) {
+				code = addLine(
+					`${name}: prismic.NestedGroupField<Simplify<${itemName}>>;`,
+					code,
+				);
+			} else {
+				code = addLine(
+					`${name}: prismic.GroupField<Simplify<${itemName}>>;`,
+					code,
+				);
+			}
 
 			break;
 		}

test/generateTypes-group.test.ts

@@ -56,6 +56,51 @@ it("creates an interface for a group item containing its fields", (ctx) => {
 	).toBe("prismic.SelectField");
 });
 
+it("supports nested groups", (ctx) => {
+	const model = ctx.mock.model.customType({
+		id: "foo",
+		fields: {
+			bar: ctx.mock.model.group({
+				fields: {
+					baz: ctx.mock.model.group({
+						fields: {
+							qux: ctx.mock.model.keyText(),
+							quux: ctx.mock.model.select(),
+						},
+					}),
+				},
+			}),
+		},
+	});
+
+	const types = lib.generateTypes({ customTypeModels: [model] });
+	const file = parseSourceFile(types);
+
+	const nestedGroupProperty = file
+		.getInterfaceOrThrow("FooDocumentDataBarItem")
+		.getPropertyOrThrow("baz");
+	expect(nestedGroupProperty.getTypeNodeOrThrow().getText()).toBe(
+		"prismic.NestedGroupField<Simplify<FooDocumentDataBazItem>>",
+	);
+
+	const nestedGroupItemInterface = file.getInterfaceOrThrow(
+		"FooDocumentDataBazItem",
+	);
+	expect(nestedGroupItemInterface.isExported()).toBe(true);
+	expect(
+		nestedGroupItemInterface
+			.getPropertyOrThrow("qux")
+			.getTypeNodeOrThrow()
+			.getText(),
+	).toBe("prismic.KeyTextField");
+	expect(
+		nestedGroupItemInterface
+			.getPropertyOrThrow("quux")
+			.getTypeNodeOrThrow()
+			.getText(),
+	).toBe("prismic.SelectField");
+});
+
 it("prefixes Group types starting with a number using an underscore prefix", (ctx) => {
 	const model = ctx.mock.model.customType({
 		id: "123",