fix: replace backslash in partials with forward slash

lib/express-handlebars.ts

@@ -328,7 +328,8 @@ export default class ExpressHandlebars {
 			if (options._throwTestError) {
 				throw new Error("test");
 			}
-			return (await dir).concat();
+
+			return (await dir).map(d => d.replace(/\\/g, "/"));
 		} catch (err) {
 			delete cache[dirPath];
 			throw err;

spec/express-handlebars.test.ts

@@ -58,6 +58,7 @@ describe("express-handlebars", () => {
 			expect(partials).toEqual({
 				partial: expect.any(Function),
 				"partial-latin1": expect.any(Function),
+				"subdir/partial-subdir": expect.any(Function),
 			});
 		});
 
@@ -67,6 +68,7 @@ describe("express-handlebars", () => {
 			expect(partials).toEqual({
 				partial: expect.any(Function),
 				"partial-latin1": expect.any(Function),
+				"subdir/partial-subdir": expect.any(Function),
 			});
 		});
 
@@ -109,6 +111,7 @@ describe("express-handlebars", () => {
 			expect(partials).toEqual({
 				partial: expect.any(Function),
 				"partial-latin1": expect.any(Function),
+				"subdir/partial-subdir": expect.any(Function),
 			});
 		});
 
@@ -241,7 +244,7 @@ describe("express-handlebars", () => {
 			const exphbs = expressHandlebars.create();
 			const dirPath = fixturePath("templates");
 			const templates = await exphbs.getTemplates(dirPath);
-			const paths = Object.keys(templates).map(t => t.replace(/\\/g, "/"));
+			const paths = Object.keys(templates);
 			expect(paths).toEqual([
 				"template.handlebars",
 				"template-latin1.handlebars",
@@ -322,6 +325,15 @@ describe("express-handlebars", () => {
 			expect(html.replace(/\r/g, "")).toBe("<h1>partial test text</h1>\n<p>test text</p>");
 		});
 
+		test("should render with subdir/partial", async () => {
+			const exphbs = expressHandlebars.create({
+				partialsDir: fixturePath("partials"),
+			});
+			const filePath = fixturePath("render-subdir-partial.handlebars");
+			const html = await exphbs.render(filePath, { text: "test text" });
+			expect(html.replace(/\r/g, "")).toBe("<h1>subdir partial test text</h1>\n<p>test text</p>");
+		});
+
 		test("should render with runtimeOptions", async () => {
 			const exphbs = expressHandlebars.create({
 				runtimeOptions: { allowProtoPropertiesByDefault: true },

spec/fixtures/partials/subdir/partial-subdir.handlebars

@@ -0,0 +1 @@
+subdir partial {{text}}

spec/fixtures/render-subdir-partial.handlebars

@@ -0,0 +1,2 @@
+<h1>{{> subdir/partial-subdir}}</h1>
+<p>{{text}}</p>