diff --git a/package-lock.json b/package-lock.json
index d3f851a..6b89a2b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -50,7 +50,7 @@
 				"prettier": "^2.2.1",
 				"ts-loader": "^8.0.14",
 				"ts-node": "^10.4.0",
-				"typescript": "^4.1.3"
+				"typescript": "^4.7"
 			},
 			"engines": {
 				"node": ">=17.0.0"
diff --git a/package.json b/package.json
index 6771115..c91559a 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
 	"version": "0.1.0",
 	"description": "",
 	"main": "./dist/back/index.js",
+	"type": "module",
 	"scripts": {
 		"start": "docker-compose up -d db && node .",
 		"typecheck:back": "npx tsc --noEmit --target es6 --lib es2015,dom -p src/back",
@@ -32,7 +33,7 @@
 		"@hotwired/turbo": "^7.1.0",
 		"@koa/router": "^12.0.1",
 		"@playwright/test": "^1.36.1",
-		"@sealcode/sealgen": "^0.8.52",
+		"@sealcode/sealgen": "^0.9.0",
 		"@sealcode/ts-predicates": "^0.4.3",
 		"@types/kill-port": "^2.0.0",
 		"hint": "^7.0.1",
@@ -68,7 +69,7 @@
 		"prettier": "^2.2.1",
 		"ts-loader": "^8.0.14",
 		"ts-node": "^10.4.0",
-		"typescript": "^4.1.3"
+		"typescript": "^4.7"
 	},
 	"nyc": {
 		"extends": "@istanbuljs/nyc-config-typescript",
diff --git a/src/back/app.ts b/src/back/app.ts
index 1714d56..ff7ebe2 100644
--- a/src/back/app.ts
+++ b/src/back/app.ts
@@ -1,9 +1,10 @@
 import _locreq from "locreq";
-import { default as Sealious, App, LoggerMailer, SMTPMailer } from "sealious";
-import { LoggerLevel } from "sealious/@types/src/app/logger";
-import { collections } from "./collections/collections";
-import ADMIN_CREDENTIALS from "./default-admin-credentials";
-const locreq = _locreq(__dirname);
+import Sealious, { App, LoggerMailer, SMTPMailer } from "sealious";
+import type { LoggerLevel } from "sealious/@types/src/app/logger.js";
+import { collections } from "./collections/collections.js";
+import ADMIN_CREDENTIALS from "./default-admin-credentials.js";
+import { module_dirname } from "./util.js";
+const locreq = _locreq.default(module_dirname(import.meta.url));
 
 const PORT = process.env.SEALIOUS_PORT ? parseInt(process.env.SEALIOUS_PORT) : 8080;
 const base_url = process.env.SEALIOUS_BASE_URL || `http://localhost:${PORT}`;
diff --git a/src/back/collections/collections.ts b/src/back/collections/collections.ts
index 5f98446..e20ccc6 100644
--- a/src/back/collections/collections.ts
+++ b/src/back/collections/collections.ts
@@ -1,13 +1,13 @@
 // DO NOT EDIT! This file is generated automaticaly with 'npm run generate-collections'
 import { App } from "sealious";
 
-import _GroupsToUsers from "./groups-to-users";
-import _Groups from "./groups";
-import _PasswordResetIntents from "./password-reset-intents";
-import _Secrets from "./secrets";
-import _Tasks from "./tasks";
-import _UserRoles from "./user-roles";
-import _Users from "./users";
+import _GroupsToUsers from "./groups-to-users.js";
+import _Groups from "./groups.js";
+import _PasswordResetIntents from "./password-reset-intents.js";
+import _Secrets from "./secrets.js";
+import _Tasks from "./tasks.js";
+import _UserRoles from "./user-roles.js";
+import _Users from "./users.js";
 
 export const GroupsToUsers = new _GroupsToUsers();
 export const Groups = new _Groups();
diff --git a/src/back/collections/groups-to-users.ts b/src/back/collections/groups-to-users.ts
index 4314e5a..3439d76 100644
--- a/src/back/collections/groups-to-users.ts
+++ b/src/back/collections/groups-to-users.ts
@@ -1,5 +1,5 @@
 import { Collection, FieldTypes, Policies } from "sealious";
-import { Roles } from "../policy-types/roles";
+import { Roles } from "../policy-types/roles.js";
 
 export default class GroupsToUsers extends Collection {
 	fields = {
diff --git a/src/back/collections/groups.ts b/src/back/collections/groups.ts
index f1c4dce..6d01787 100644
--- a/src/back/collections/groups.ts
+++ b/src/back/collections/groups.ts
@@ -1,5 +1,5 @@
 import { Collection, FieldTypes, Policies } from "sealious";
-import { Roles } from "../policy-types/roles";
+import { Roles } from "../policy-types/roles.js";
 
 export default class Groups extends Collection {
 	fields = {
diff --git a/src/back/collections/password-reset-intents.test.ts b/src/back/collections/password-reset-intents.test.ts
index f2a77b2..e2d555a 100644
--- a/src/back/collections/password-reset-intents.test.ts
+++ b/src/back/collections/password-reset-intents.test.ts
@@ -1,7 +1,7 @@
 import axios from "axios";
 import assert from "assert";
-import TheApp from "../app";
-import { withProdApp } from "../test_utils/with-prod-app";
+import TheApp from "../app.js";
+import { withProdApp } from "../test_utils/with-prod-app.js";
 
 describe("password-reset-intents", function () {
 	//ts-ignore
@@ -18,7 +18,7 @@ describe("password-reset-intents", function () {
 		return withProdApp(async ({ app, base_url }) => {
 			const email = "fake@example.com";
 			try {
-				await axios.post(
+				await axios.default.post(
 					`${base_url}/api/v1/collections/password-reset-intents`,
 					{
 						email: email,
@@ -39,7 +39,7 @@ describe("password-reset-intents", function () {
 		withProdApp(async ({ app, base_url }) => {
 			await createAUser(app);
 			const { email, token } = (
-				await axios.post(
+				await axios.default.post(
 					`${base_url}/api/v1/collections/password-reset-intents`,
 					{
 						email: "user@example.com",
@@ -59,7 +59,7 @@ describe("password-reset-intents", function () {
 		withProdApp(async ({ app, base_url }) => {
 			const email = "incorrect-address";
 			try {
-				await axios.post(
+				await axios.default.post(
 					`${base_url}/api/v1/collections/password-reset-intents`,
 					{
 						email: email,
@@ -78,9 +78,12 @@ describe("password-reset-intents", function () {
 	it("sends an email with the reset password link", async () =>
 		withProdApp(async ({ app, base_url, mail_api }) => {
 			await createAUser(app);
-			await axios.post(`${base_url}/api/v1/collections/password-reset-intents`, {
-				email: "user@example.com",
-			});
+			await axios.default.post(
+				`${base_url}/api/v1/collections/password-reset-intents`,
+				{
+					email: "user@example.com",
+				}
+			);
 			const messages = (await mail_api.getMessages()).filter(
 				(message) => message.recipients[0] == "<user@example.com>"
 			);
diff --git a/src/back/collections/password-reset-intents.ts b/src/back/collections/password-reset-intents.ts
index c9e79a7..65b4b06 100644
--- a/src/back/collections/password-reset-intents.ts
+++ b/src/back/collections/password-reset-intents.ts
@@ -1,7 +1,7 @@
 import { App, Collection, CollectionItem, Context, FieldTypes, Policies } from "sealious";
 import assert from "assert";
-import PasswordResetTemplate from "../email-templates/password-reset";
-import TheApp from "../app";
+import PasswordResetTemplate from "../email-templates/password-reset.js";
+import TheApp from "../app.js";
 import { assertType, predicates } from "@sealcode/ts-predicates";
 
 export default class PasswordResetIntents extends Collection {
diff --git a/src/back/collections/secrets.ts b/src/back/collections/secrets.ts
index 1a14d4e..ff02014 100644
--- a/src/back/collections/secrets.ts
+++ b/src/back/collections/secrets.ts
@@ -1,5 +1,5 @@
 import { Collection, FieldTypes } from "sealious";
-import { Roles } from "../policy-types/roles";
+import { Roles } from "../policy-types/roles.js";
 
 /* For testing the Roles policy */
 export default class Secrets extends Collection {
diff --git a/src/back/collections/user-roles.test.ts b/src/back/collections/user-roles.test.ts
index b3d6099..962e27f 100644
--- a/src/back/collections/user-roles.test.ts
+++ b/src/back/collections/user-roles.test.ts
@@ -1,9 +1,9 @@
 import assert from "assert";
 import axios from "axios";
 import { Context, TestUtils } from "sealious";
-import { withProdApp } from "../test_utils/with-prod-app";
-import { createAdmin, createAUser } from "../test_utils/users";
-import Users from "./users";
+import { withProdApp } from "../test_utils/with-prod-app.js";
+import { createAdmin, createAUser } from "../test_utils/users.js";
+import Users from "./users.js";
 
 describe("user-roles", () => {
 	it("rejects when given an empty role", async () =>
@@ -31,7 +31,7 @@ describe("user-roles", () => {
 	it("accepts correct dataset", async () =>
 		withProdApp(async ({ app, base_url, rest_api }) => {
 			const [user, session] = await createAdmin(app, rest_api);
-			const response = await axios.post(
+			const response = await axios.default.post(
 				`${base_url}/api/v1/collections/user-roles`,
 				{
 					user: user.id,
diff --git a/src/back/collections/user-roles.ts b/src/back/collections/user-roles.ts
index 5402f78..e88c9be 100644
--- a/src/back/collections/user-roles.ts
+++ b/src/back/collections/user-roles.ts
@@ -1,5 +1,5 @@
 import { App, Collection, FieldTypes, Policies, Policy } from "sealious";
-import { Roles } from "../policy-types/roles";
+import { Roles } from "../policy-types/roles.js";
 
 export default class UserRoles extends Collection {
 	name = "user-roles";
diff --git a/src/back/collections/users.ts b/src/back/collections/users.ts
index 0da7410..330ba4d 100644
--- a/src/back/collections/users.ts
+++ b/src/back/collections/users.ts
@@ -1,7 +1,7 @@
 import { App, Collections, Context, FieldTypes, Policies } from "sealious";
 import assert from "assert";
-import TheApp from "../app";
-import ADMIN_CREDENTIALS from "../default-admin-credentials";
+import TheApp from "../app.js";
+import ADMIN_CREDENTIALS from "../default-admin-credentials.js";
 
 export default class Users extends Collections.users {
 	fields = {
diff --git a/src/back/email-templates/password-reset.ts b/src/back/email-templates/password-reset.ts
index d9fe767..bd6421e 100644
--- a/src/back/email-templates/password-reset.ts
+++ b/src/back/email-templates/password-reset.ts
@@ -1,5 +1,5 @@
 import { EmailTemplates, Errors } from "sealious";
-import TheApp from "../app";
+import TheApp from "../app.js";
 
 export default async function PasswordResetTemplate(
 	app: TheApp,
diff --git a/src/back/html.ts b/src/back/html.ts
index a98fce7..71a239e 100644
--- a/src/back/html.ts
+++ b/src/back/html.ts
@@ -1,7 +1,7 @@
 import { Templatable, tempstream } from "tempstream";
 import { Readable } from "stream";
 import { BaseContext } from "koa";
-import navbar from "./routes/common/navbar";
+import navbar from "./routes/common/navbar.js";
 
 export const defaultHead = (ctx: BaseContext, title: string) => /* HTML */ `<title>
 		${title} · ${ctx.$app.manifest.name}
diff --git a/src/back/index.ts b/src/back/index.ts
index 9871637..75dc44a 100644
--- a/src/back/index.ts
+++ b/src/back/index.ts
@@ -1,8 +1,9 @@
 import kill from "kill-port";
 import _locreq from "locreq";
-import TheApp from "./app";
-import { mainRouter } from "./routes";
-const locreq = _locreq(__dirname);
+import TheApp from "./app.js";
+import { mainRouter } from "./routes/index.js";
+import { module_dirname } from "./util.js";
+const locreq = _locreq.default(module_dirname(import.meta.url));
 
 const app = new TheApp();
 
diff --git a/src/back/policy-types/roles.test.ts b/src/back/policy-types/roles.test.ts
index d444f40..dae1e8d 100644
--- a/src/back/policy-types/roles.test.ts
+++ b/src/back/policy-types/roles.test.ts
@@ -1,4 +1,4 @@
-import { withProdApp } from "../test_utils/with-prod-app";
+import { withProdApp } from "../test_utils/with-prod-app.js";
 
 describe("roles", () => {
 	it("allows access to users with designated role and denies access to users without it", async () =>
diff --git a/src/back/routes/common/main-view.ts b/src/back/routes/common/main-view.ts
index 2dda192..196fdba 100644
--- a/src/back/routes/common/main-view.ts
+++ b/src/back/routes/common/main-view.ts
@@ -1,4 +1,4 @@
-import html from "../../html";
+import html from "../../html.js";
 import { BaseContext } from "koa";
 import { Readable } from "stream";
 import { tempstream } from "tempstream";
diff --git a/src/back/routes/common/navbar.ts b/src/back/routes/common/navbar.ts
index 445f6f8..8081bff 100644
--- a/src/back/routes/common/navbar.ts
+++ b/src/back/routes/common/navbar.ts
@@ -1,5 +1,5 @@
 import { BaseContext } from "koa";
-import { SignUpURL, SignInURL, TodoURL, LogoutURL } from "../urls";
+import { SignUpURL, SignInURL, TodoURL, LogoutURL } from "../urls.js";
 
 export default async function navbar(ctx: BaseContext) {
 	const isLoggedIn = !!ctx.$context.session_id;
@@ -17,7 +17,7 @@ export default async function navbar(ctx: BaseContext) {
 	const linksHTML = linkData
 		.map((link) =>
 			link.url === new URL(ctx.url, "https://a.com").pathname
-				? `<li>${link.text}</li>`
+				? `<li class="active"><span>${link.text}</span></li>`
 				: /* HTML */ `<li><a href="${link.url}">${link.text}</a></li>`
 		)
 		.join("\n");
@@ -30,7 +30,7 @@ export default async function navbar(ctx: BaseContext) {
 				width="50"
 				height="50"
 			/>
-			Sealious App
+			${ctx.$app.manifest.name}
 		</a>
 		<ul>
 			${linksHTML}
diff --git a/src/back/routes/common/tasks-view.ts b/src/back/routes/common/tasks-view.ts
index b39e541..5d74f47 100644
--- a/src/back/routes/common/tasks-view.ts
+++ b/src/back/routes/common/tasks-view.ts
@@ -1,7 +1,7 @@
 import { BaseContext } from "koa";
 import { CollectionItem } from "sealious";
-import frame from "../../frame";
-import { Tasks } from "../../collections/collections";
+import frame from "../../frame.js";
+import { Tasks } from "../../collections/collections.js";
 
 export function Task(task: CollectionItem<typeof Tasks>) {
 	return frame(
diff --git a/src/back/routes/hello.test.ts b/src/back/routes/hello.test.ts
index cbaead6..d5d2c68 100644
--- a/src/back/routes/hello.test.ts
+++ b/src/back/routes/hello.test.ts
@@ -1,6 +1,6 @@
-import { withProdApp } from "../test_utils/with-prod-app";
-import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint";
-import { HelloURL } from "./urls";
+import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint.js";
+import { withProdApp } from "../test_utils/with-prod-app.js";
+import { HelloURL } from "./urls.js";
 
 describe("Hello", () => {
 	it("doesn't crash", async function () {
diff --git a/src/back/routes/index.test.ts b/src/back/routes/index.test.ts
index b9fcb36..94449b5 100644
--- a/src/back/routes/index.test.ts
+++ b/src/back/routes/index.test.ts
@@ -1,5 +1,5 @@
-import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint";
-import { withProdApp } from "../test_utils/with-prod-app";
+import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint.js";
+import { withProdApp } from "../test_utils/with-prod-app.js";
 
 describe("homepage", function () {
 	this.timeout(VERY_LONG_TEST_TIMEOUT);
diff --git a/src/back/routes/index.ts b/src/back/routes/index.ts
index d904557..e2111b5 100644
--- a/src/back/routes/index.ts
+++ b/src/back/routes/index.ts
@@ -1,7 +1,7 @@
 import Router from "@koa/router";
 import { Middlewares } from "sealious";
-import { MainView } from "./common/main-view";
-import mountAutoRoutes from "./routes";
+import { MainView } from "./common/main-view.js";
+import mountAutoRoutes from "./routes.js";
 
 export const mainRouter = (router: Router): void => {
 	router.get("/", Middlewares.extractContext(), async (ctx) => {
diff --git a/src/back/routes/logout.test.ts b/src/back/routes/logout.test.ts
index 3ce41bc..cc67b07 100644
--- a/src/back/routes/logout.test.ts
+++ b/src/back/routes/logout.test.ts
@@ -1,10 +1,10 @@
 import assert from "assert";
-import { withProdApp } from "../test_utils/with-prod-app";
-import { LONG_TEST_TIMEOUT, VERY_LONG_TEST_TIMEOUT } from "../test_utils/webhint";
-import { LogoutURL, SignInURL } from "./urls";
 import { Browser, BrowserContext, Page } from "@playwright/test";
-import { getBrowser } from "../test_utils/browser-creator";
-import ADMIN_CREDENTIALS from "../default-admin-credentials";
+import ADMIN_CREDENTIALS from "../default-admin-credentials.js";
+import { getBrowser } from "../test_utils/browser-creator.js";
+import { LONG_TEST_TIMEOUT, VERY_LONG_TEST_TIMEOUT } from "../test_utils/webhint.js";
+import { withProdApp } from "../test_utils/with-prod-app.js";
+import { LogoutURL, SignInURL } from "./urls.js";
 
 describe("Logout", () => {
 	let page: Page;
diff --git a/src/back/routes/routes.ts b/src/back/routes/routes.ts
index a9e9aa5..84f4575 100644
--- a/src/back/routes/routes.ts
+++ b/src/back/routes/routes.ts
@@ -2,13 +2,13 @@
 
 import Router from "@koa/router";
 import { mount } from "@sealcode/sealgen";
-import * as URLs from "./urls";
+import * as URLs from "./urls.js";
 
-import { default as Hello } from "./hello.page";
-import { default as Logout } from "./logout.redirect";
-import { default as SignIn } from "./signIn.form";
-import { default as SignUp } from "./signUp.form";
-import { default as Todo } from "./todo.form";
+import { default as Hello } from "./hello.page.js";
+import { default as Logout } from "./logout.redirect.js";
+import { default as SignIn } from "./signIn.form.js";
+import { default as SignUp } from "./signUp.form.js";
+import { default as Todo } from "./todo.form.js";
 
 export default function mountAutoRoutes(router: Router) {
 	mount(router, URLs.HelloURL, Hello);
diff --git a/src/back/routes/signIn.form.ts b/src/back/routes/signIn.form.ts
index a330422..4c3911b 100644
--- a/src/back/routes/signIn.form.ts
+++ b/src/back/routes/signIn.form.ts
@@ -7,10 +7,10 @@ import {
 	Controls,
 	FormReaction,
 } from "@sealcode/sealgen";
-import html from "../html";
-import { Users } from "../collections/collections";
 import { FlatTemplatable, tempstream } from "tempstream";
-import { PageErrorMessage } from "@sealcode/sealgen/@types/page/mountable-with-fields";
+import { Users } from "../collections/collections.js";
+import type { PageErrorMessage } from "@sealcode/sealgen/@types/page/mountable-with-fields.js";
+import html from "../html.js";
 
 export const actionName = "SignIn";
 
diff --git a/src/back/routes/signIn.test.ts b/src/back/routes/signIn.test.ts
index 64796ee..9d1f218 100644
--- a/src/back/routes/signIn.test.ts
+++ b/src/back/routes/signIn.test.ts
@@ -1,9 +1,9 @@
-import { withProdApp } from "../test_utils/with-prod-app";
-import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint";
-import { SignInURL, LogoutURL } from "./urls";
 import { Browser, BrowserContext, Page } from "@playwright/test";
-import { getBrowser } from "../test_utils/browser-creator";
-import ADMIN_CREDENTIALS from "../default-admin-credentials";
+import ADMIN_CREDENTIALS from "../default-admin-credentials.js";
+import { getBrowser } from "../test_utils/browser-creator.js";
+import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint.js";
+import { withProdApp } from "../test_utils/with-prod-app.js";
+import { LogoutURL, SignInURL } from "./urls.js";
 
 describe("SignIn", () => {
 	let page: Page;
diff --git a/src/back/routes/signUp.form.ts b/src/back/routes/signUp.form.ts
index d2557d3..e61a509 100644
--- a/src/back/routes/signUp.form.ts
+++ b/src/back/routes/signUp.form.ts
@@ -7,8 +7,8 @@ import {
 	Controls,
 	FormReaction,
 } from "@sealcode/sealgen";
-import html from "../html";
-import { Users } from "../collections/collections";
+import { Users } from "../collections/collections.js";
+import html from "../html.js";
 
 export const actionName = "SignUp";
 
diff --git a/src/back/routes/signUp.test.ts b/src/back/routes/signUp.test.ts
index 536b4ff..d0177e3 100644
--- a/src/back/routes/signUp.test.ts
+++ b/src/back/routes/signUp.test.ts
@@ -1,9 +1,9 @@
-import { withProdApp } from "../test_utils/with-prod-app";
-import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint";
-import { SignUpURL, LogoutURL, SignInURL } from "./urls";
 import { Browser, BrowserContext, Page } from "@playwright/test";
-import { getBrowser } from "../test_utils/browser-creator";
-import ADMIN_CREDENTIALS from "../default-admin-credentials";
+import ADMIN_CREDENTIALS from "../default-admin-credentials.js";
+import { getBrowser } from "../test_utils/browser-creator.js";
+import { VERY_LONG_TEST_TIMEOUT, webhintURL } from "../test_utils/webhint.js";
+import { withProdApp } from "../test_utils/with-prod-app.js";
+import { LogoutURL, SignInURL, SignUpURL } from "./urls.js";
 
 describe("SignUp", () => {
 	let page: Page;
diff --git a/src/back/routes/todo.form.ts b/src/back/routes/todo.form.ts
index c96da3d..c21bb67 100644
--- a/src/back/routes/todo.form.ts
+++ b/src/back/routes/todo.form.ts
@@ -1,9 +1,9 @@
-import { Tasks } from "./../collections/collections";
 import { tempstream } from "tempstream";
 import { Context } from "koa";
 import { Form, FormData, FormDataValue, Fields, Controls } from "@sealcode/sealgen";
-import html from "../html";
-import { TaskList } from "./common/tasks-view";
+import { Tasks } from "../collections/collections.js";
+import html from "../html.js";
+import { TaskList } from "./common/tasks-view.js";
 
 export const actionName = "Todo";
 
diff --git a/src/back/routes/todo.test.ts b/src/back/routes/todo.test.ts
index a50338d..2ee8ce1 100644
--- a/src/back/routes/todo.test.ts
+++ b/src/back/routes/todo.test.ts
@@ -1,10 +1,10 @@
 import assert from "assert";
-import { withProdApp } from "../test_utils/with-prod-app";
-import { LONG_TEST_TIMEOUT, VERY_LONG_TEST_TIMEOUT } from "../test_utils/webhint";
-import { SignInURL, TodoURL } from "./urls";
 import { Browser, BrowserContext, Page } from "@playwright/test";
-import { getBrowser } from "../test_utils/browser-creator";
-import ADMIN_CREDENTIALS from "../default-admin-credentials";
+import ADMIN_CREDENTIALS from "../default-admin-credentials.js";
+import { getBrowser } from "../test_utils/browser-creator.js";
+import { LONG_TEST_TIMEOUT, VERY_LONG_TEST_TIMEOUT } from "../test_utils/webhint.js";
+import { withProdApp } from "../test_utils/with-prod-app.js";
+import { SignInURL, TodoURL } from "./urls.js";
 
 describe("Todo", function () {
 	let page: Page;
diff --git a/src/back/test_utils/users.ts b/src/back/test_utils/users.ts
index ee04a37..071f45a 100644
--- a/src/back/test_utils/users.ts
+++ b/src/back/test_utils/users.ts
@@ -1,6 +1,6 @@
-import { Users } from "../collections/collections";
 import { CollectionItem, TestUtils } from "sealious";
-import TheApp from "../app";
+import TheApp from "../app.js";
+import Users from "../collections/users.js";
 
 type Unpromisify<T> = T extends Promise<infer R> ? R : T;
 
@@ -16,9 +16,7 @@ export function createAUser(app: TheApp, username: string) {
 export async function createAdmin(
 	app: TheApp,
 	rest_api: TestUtils.MockRestApi
-): Promise<
-	[CollectionItem<typeof Users>, Unpromisify<ReturnType<typeof rest_api.login>>]
-> {
+): Promise<[CollectionItem<Users>, Unpromisify<ReturnType<typeof rest_api.login>>]> {
 	const user = await createAUser(app, "super_user");
 	await app.collections["user-roles"].suCreate({
 		user: user.id,
diff --git a/src/back/test_utils/webhint.ts b/src/back/test_utils/webhint.ts
index 201b046..2cd990c 100644
--- a/src/back/test_utils/webhint.ts
+++ b/src/back/test_utils/webhint.ts
@@ -1,5 +1,5 @@
 import _locreq from "locreq";
-const locreq = _locreq(__dirname);
+const locreq = _locreq.default(__dirname);
 import { spawn } from "child_process";
 import { hasShape, is, predicates } from "@sealcode/ts-predicates";
 import { promises as fs } from "fs";
diff --git a/src/back/test_utils/with-prod-app.ts b/src/back/test_utils/with-prod-app.ts
index cf57396..deceb58 100644
--- a/src/back/test_utils/with-prod-app.ts
+++ b/src/back/test_utils/with-prod-app.ts
@@ -1,11 +1,12 @@
-import TheApp from "../app";
-import { mainRouter } from "../routes";
 import _locreq from "locreq";
 import { v4 as uuid } from "uuid";
 
-const locreq = _locreq(__dirname);
+const locreq = _locreq.default(module_dirname(import.meta.url));
 import { SMTPMailer } from "sealious";
 import { TestUtils } from "sealious";
+import TheApp from "../app.js";
+import { mainRouter } from "../routes/index.js";
+import { module_dirname } from "../util.js";
 
 export async function withProdApp(
 	callback: (args: {
diff --git a/src/back/tsconfig.json b/src/back/tsconfig.json
index 9bf565e..b3f17bd 100644
--- a/src/back/tsconfig.json
+++ b/src/back/tsconfig.json
@@ -1,7 +1,7 @@
 {
 	"compilerOptions": {
-		"module": "CommonJS",
-		"moduleResolution": "node",
+		"module": "node16",
+		"moduleResolution": "node16",
 		"noImplicitAny": true,
 		"noImplicitThis": true,
 		"strictNullChecks": true,
diff --git a/src/back/util.ts b/src/back/util.ts
index afd0abe..5786323 100644
--- a/src/back/util.ts
+++ b/src/back/util.ts
@@ -1,5 +1,6 @@
 import { BaseContext } from "koa";
 import qs from "qs";
+import { dirname } from "node:path";
 
 export async function sleep(time: number) {
 	return new Promise((resolve) => setTimeout(resolve, time));
@@ -20,3 +21,7 @@ export function UrlWithNewParams(
 ): string {
 	return `${ctx.path}?${qs.stringify(query_params)}`;
 }
+
+export function module_dirname(module_url: string): string {
+	return dirname(module_url).replace(/^file:\/\//, "");
+}