diff --git a/packages/remix/package.json b/packages/remix/package.json
index 10a0025e4..d60f54eb3 100644
--- a/packages/remix/package.json
+++ b/packages/remix/package.json
@@ -11,8 +11,9 @@
   },
   "scripts": {
     "build": "node build.js",
-    "test-e2e": "pnpm test test/integration.test.ts",
-    "test": "jest --env node --verbose --bail --runInBand"
+    "test": "jest --env node --verbose --bail --runInBand",
+    "test-unit": "pnpm test test/unit.*test.*",
+    "test-e2e": "pnpm test test/integration.test.ts"
   },
   "files": [
     "dist",
diff --git a/packages/remix/src/build.ts b/packages/remix/src/build.ts
index 68d031ba0..805ca7c13 100644
--- a/packages/remix/src/build.ts
+++ b/packages/remix/src/build.ts
@@ -1,7 +1,6 @@
 import { Project } from 'ts-morph';
 import { promises as fs } from 'fs';
 import { basename, dirname, extname, join, relative, sep } from 'path';
-import { pathToRegexp, Key } from 'path-to-regexp';
 import {
   debug,
   download,
@@ -30,7 +29,12 @@ import type {
   BuildResultV2Typical,
 } from '@vercel/build-utils';
 import type { ConfigRoute } from '@remix-run/dev/dist/config/routes';
-import { findConfig } from './utils';
+import {
+  findConfig,
+  getPathFromRoute,
+  getRegExpFromPath,
+  isLayoutRoute,
+} from './utils';
 
 const _require: typeof require = eval('require');
 
@@ -173,12 +177,13 @@ module.exports = config;`;
     }
   }
 
-  const { serverBuildPath, routes: remixRoutes } = remixConfig;
+  const { serverBuildPath } = remixConfig;
+  const remixRoutes = Object.values(remixConfig.routes);
 
   // Figure out which pages should be edge functions
   const edgePages = new Set<ConfigRoute>();
   const project = new Project();
-  for (const route of Object.values(remixRoutes)) {
+  for (const route of remixRoutes) {
     const routePath = join(remixConfig.appDirectory, route.file);
     const staticConfig = getConfig(project, routePath);
     const isEdge =
@@ -228,27 +233,11 @@ module.exports = config;`;
     },
   ];
 
-  for (const route of Object.values(remixRoutes)) {
+  for (const route of remixRoutes) {
     // Layout routes don't get a function / route added
-    const isLayoutRoute = Object.values(remixRoutes).some(
-      r => r.parentId === route.id
-    );
-    if (isLayoutRoute) continue;
-
-    // Build up the full request path
-    let currentRoute: ConfigRoute | undefined = route;
-    const pathParts: string[] = [];
-    do {
-      if (currentRoute.index) pathParts.push('index');
-      if (currentRoute.path) pathParts.push(currentRoute.path);
-      if (currentRoute.parentId) {
-        currentRoute = remixRoutes[currentRoute.parentId];
-      } else {
-        currentRoute = undefined;
-      }
-    } while (currentRoute);
-    const path = join(...pathParts.reverse());
+    if (isLayoutRoute(route.id, remixRoutes)) continue;
 
+    const path = getPathFromRoute(route, remixConfig.routes);
     const isEdge = edgePages.has(route);
     const fn =
       isEdge && edgeFunction
@@ -264,13 +253,8 @@ module.exports = config;`;
     output[path] = fn;
 
     // If this is a dynamic route then add a Vercel route
-    const keys: Key[] = [];
-    // Replace "/*" at the end to handle "splat routes"
-    const splatPath = '/:params+';
-    const rePath =
-      path === '*' ? splatPath : `/${path.replace(/\/\*$/, splatPath)}`;
-    const re = pathToRegexp(rePath, keys);
-    if (keys.length > 0) {
+    const re = getRegExpFromPath(path);
+    if (re) {
       routes.push({
         src: re.source,
         dest: path,
diff --git a/packages/remix/src/utils.ts b/packages/remix/src/utils.ts
index 3c0d63756..196aad24e 100644
--- a/packages/remix/src/utils.ts
+++ b/packages/remix/src/utils.ts
@@ -1,5 +1,10 @@
-import { existsSync } from 'fs';
 import { join } from 'path';
+import { existsSync } from 'fs';
+import { pathToRegexp, Key } from 'path-to-regexp';
+import type {
+  ConfigRoute,
+  RouteManifest,
+} from '@remix-run/dev/dist/config/routes';
 
 const configExts = ['.js', '.cjs', '.mjs'];
 
@@ -12,3 +17,39 @@ export function findConfig(dir: string, basename: string): string | undefined {
 
   return undefined;
 }
+
+export function isLayoutRoute(
+  routeId: string,
+  routes: Pick<ConfigRoute, 'id' | 'parentId'>[]
+): boolean {
+  return routes.some(r => r.parentId === routeId);
+}
+
+export function getPathFromRoute(
+  route: ConfigRoute,
+  routes: RouteManifest
+): string {
+  let currentRoute: ConfigRoute | undefined = route;
+  const pathParts: string[] = [];
+  do {
+    if (currentRoute.index) pathParts.push('index');
+    if (currentRoute.path) pathParts.push(currentRoute.path);
+    if (currentRoute.parentId) {
+      currentRoute = routes[currentRoute.parentId];
+    } else {
+      currentRoute = undefined;
+    }
+  } while (currentRoute);
+  const path = pathParts.reverse().join('/');
+  return path;
+}
+
+export function getRegExpFromPath(path: string): RegExp | false {
+  const keys: Key[] = [];
+  // Replace "/*" at the end to handle "splat routes"
+  const splatPath = '/:params+';
+  const rePath =
+    path === '*' ? splatPath : `/${path.replace(/\/\*$/, splatPath)}`;
+  const re = pathToRegexp(rePath, keys);
+  return keys.length > 0 ? re : false;
+}
diff --git a/packages/remix/test/unit.find-config.test.ts b/packages/remix/test/unit.find-config.test.ts
new file mode 100644
index 000000000..8b1312a05
--- /dev/null
+++ b/packages/remix/test/unit.find-config.test.ts
@@ -0,0 +1,17 @@
+import { join } from 'path';
+import { findConfig } from '../src/utils';
+
+const fixture = (name: string) => join(__dirname, 'fixtures', name);
+
+describe('findConfig()', () => {
+  it.each([
+    { name: '01-remix-basics', config: 'remix.config.js' },
+    { name: '02-remix-basics-mjs', config: 'remix.config.mjs' },
+    { name: '03-with-pnpm', config: 'remix.config.js' },
+    { name: '04-with-npm9-linked', config: 'remix.config.js' },
+  ])('should find `$config` from "$name"', ({ name, config }) => {
+    const dir = fixture(name);
+    const resolved = findConfig(dir, 'remix.config');
+    expect(resolved).toEqual(join(dir, config));
+  });
+});
diff --git a/packages/remix/test/unit.get-path-from-route.test.ts b/packages/remix/test/unit.get-path-from-route.test.ts
new file mode 100644
index 000000000..5eb5b720d
--- /dev/null
+++ b/packages/remix/test/unit.get-path-from-route.test.ts
@@ -0,0 +1,73 @@
+import { getPathFromRoute } from '../src/utils';
+import type { RouteManifest } from '@remix-run/dev/dist/config/routes';
+
+describe('getPathFromRoute()', () => {
+  const routes: RouteManifest = {
+    root: { path: '', id: 'root', file: 'root.tsx' },
+    'routes/$foo.$bar.$baz': {
+      path: ':foo/:bar/:baz',
+      id: 'routes/$foo.$bar.$baz',
+      parentId: 'root',
+      file: 'routes/$foo.$bar.$baz.tsx',
+    },
+    'routes/api.hello': {
+      path: 'api/hello',
+      id: 'routes/api.hello',
+      parentId: 'root',
+      file: 'routes/api.hello.tsx',
+    },
+    'routes/projects': {
+      path: 'projects',
+      id: 'routes/projects',
+      parentId: 'root',
+      file: 'routes/projects.tsx',
+    },
+    'routes/projects/index': {
+      path: undefined,
+      index: true,
+      id: 'routes/projects/indexx',
+      parentId: 'routes/projects',
+      file: 'routes/projects/indexx.tsx',
+    },
+    'routes/projects/$': {
+      path: '*',
+      id: 'routes/projects/$',
+      parentId: 'routes/projects',
+      file: 'routes/projects/$.tsx',
+    },
+    'routes/index': {
+      path: undefined,
+      index: true,
+      id: 'routes/index',
+      parentId: 'root',
+      file: 'routes/index.tsx',
+    },
+    'routes/node': {
+      path: 'node',
+      id: 'routes/node',
+      parentId: 'root',
+      file: 'routes/node.tsx',
+    },
+    'routes/$': {
+      path: '*',
+      id: 'routes/$',
+      parentId: 'root',
+      file: 'routes/$.tsx',
+    },
+  };
+
+  it.each([
+    { id: 'root', expected: '' },
+    { id: 'routes/index', expected: 'index' },
+    { id: 'routes/api.hello', expected: 'api/hello' },
+    { id: 'routes/projects', expected: 'projects' },
+    { id: 'routes/projects/index', expected: 'projects/index' },
+    { id: 'routes/projects/$', expected: 'projects/*' },
+    { id: 'routes/$foo.$bar.$baz', expected: ':foo/:bar/:baz' },
+    { id: 'routes/node', expected: 'node' },
+    { id: 'routes/$', expected: '*' },
+  ])('should return `$expected` for "$id" route', ({ id, expected }) => {
+    const route = routes[id];
+    expect(getPathFromRoute(route, routes)).toEqual(expected);
+  });
+});
diff --git a/packages/remix/test/unit.get-regexp-from-path.test.ts b/packages/remix/test/unit.get-regexp-from-path.test.ts
new file mode 100644
index 000000000..a8a344fee
--- /dev/null
+++ b/packages/remix/test/unit.get-regexp-from-path.test.ts
@@ -0,0 +1,124 @@
+import { getRegExpFromPath } from '../src/utils';
+
+describe('getRegExpFromPath()', () => {
+  describe('paths without parameters', () => {
+    it.each([{ path: 'index' }, { path: 'api/hello' }, { path: 'projects' }])(
+      'should return `false` for "$path"',
+      ({ path }) => {
+        expect(getRegExpFromPath(path)).toEqual(false);
+      }
+    );
+  });
+
+  describe.each([
+    {
+      path: '*',
+      urls: [
+        {
+          url: '/',
+          expected: false,
+        },
+        {
+          url: '/foo',
+          expected: true,
+        },
+        {
+          url: '/projects/foo',
+          expected: true,
+        },
+        {
+          url: '/projects/another',
+          expected: true,
+        },
+        {
+          url: '/to/infinity/and/beyond',
+          expected: true,
+        },
+      ],
+    },
+    {
+      path: 'projects/*',
+      urls: [
+        {
+          url: '/',
+          expected: false,
+        },
+        {
+          url: '/foo',
+          expected: false,
+        },
+        {
+          url: '/projects/foo',
+          expected: true,
+        },
+        {
+          url: '/projects/another',
+          expected: true,
+        },
+      ],
+    },
+    {
+      path: ':foo',
+      urls: [
+        {
+          url: '/',
+          expected: false,
+        },
+        {
+          url: '/foo',
+          expected: true,
+        },
+        {
+          url: '/projects/foo',
+          expected: false,
+        },
+        {
+          url: '/projects/another',
+          expected: false,
+        },
+      ],
+    },
+    {
+      path: 'blog/:id/edit',
+      urls: [
+        {
+          url: '/',
+          expected: false,
+        },
+        {
+          url: '/foo',
+          expected: false,
+        },
+        {
+          url: '/blog/123/edit',
+          expected: true,
+        },
+        {
+          url: '/blog/456/edit',
+          expected: true,
+        },
+        {
+          url: '/blog/123/456/edit',
+          expected: false,
+        },
+        {
+          url: '/blog/123/another',
+          expected: false,
+        },
+      ],
+    },
+  ])('with path "$path"', ({ path, urls }) => {
+    const re = getRegExpFromPath(path) as RegExp;
+
+    it('should return RegExp', () => {
+      expect(re).toBeInstanceOf(RegExp);
+    });
+
+    it.each(urls)(
+      'should match URL "$url" - $expected',
+      ({ url, expected }) => {
+        expect(re.test(url)).toEqual(expected);
+      }
+    );
+  });
+});
diff --git a/packages/remix/test/unit.is-layout-route.test.ts b/packages/remix/test/unit.is-layout-route.test.ts
new file mode 100644
index 000000000..787d7d7b5
--- /dev/null
+++ b/packages/remix/test/unit.is-layout-route.test.ts
@@ -0,0 +1,21 @@
+import { isLayoutRoute } from '../src/utils';
+
+describe('isLayoutRoute()', () => {
+  const routes = [
+    { id: 'root' },
+    { id: 'routes/auth', parentId: 'root' },
+    { id: 'routes/login', parentId: 'routes/auth' },
+    { id: 'routes/logout', parentId: 'routes/auth' },
+    { id: 'routes/index', parentId: 'root' },
+  ];
+
+  it.each([
+    { id: 'root', expected: true },
+    { id: 'routes/auth', expected: true },
+    { id: 'routes/index', expected: false },
+    { id: 'routes/login', expected: false },
+    { id: 'routes/logout', expected: false },
+  ])('should return `$expected` for "$id" route', ({ id, expected }) => {
+    expect(isLayoutRoute(id, routes)).toEqual(expected);
+  });
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fa998dc92..bfad38fc0 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1203,6 +1203,7 @@ packages:
       semver: 6.3.0
     transitivePeerDependencies:
       - supports-color
+    dev: true
 
   /@babel/core/7.5.0:
     resolution: {integrity: sha512-6Isr4X98pwXqHvtigw71CKgmhL1etZjPs5A67jL/w0TkLM9eqmFR40YrnJvEc1WnMZFsskjsmid8bHZyxKEAnw==}
@@ -1268,7 +1269,7 @@ packages:
       '@babel/core': ^7.0.0
     dependencies:
       '@babel/compat-data': 7.20.10
-      '@babel/core': 7.20.12_supports-color@7.2.0
+      '@babel/core': 7.20.12
       '@babel/helper-validator-option': 7.18.6
       browserslist: 4.21.4
       lru-cache: 5.1.1
@@ -1298,7 +1299,7 @@ packages:
     peerDependencies:
       '@babel/core': ^7.0.0
     dependencies:
-      '@babel/core': 7.20.12_supports-color@7.2.0
+      '@babel/core': 7.20.12
       '@babel/helper-annotate-as-pure': 7.18.6
       regexpu-core: 5.2.2
 
@@ -1381,6 +1382,7 @@ packages:
       '@babel/types': 7.20.7
     transitivePeerDependencies:
       - supports-color
+    dev: true
 
   /@babel/helper-optimise-call-expression/7.18.6:
     resolution: {integrity: sha512-HP59oD9/fEHQkdcbgFCnbmgH5vIQTJbxh2yf+CdM89/glUNnuzr87Q8GIjGEnOktTROemO0Pe0iPAYbqZuOUiA==}
@@ -1506,6 +1508,7 @@ packages:
       '@babel/types': 7.20.7
     transitivePeerDependencies:
       - supports-color
+    dev: true
 
   /@babel/highlight/7.18.6:
     resolution: {integrity: sha512-u7stbOuYjaPezCuLj29hNW1v64M2Md2qupEKP1fHc7WdOA3DgLh37suiSrZYY7haUB7iBeQZ9P1uiRF359do3g==}
@@ -1675,7 +1678,7 @@ packages:
     peerDependencies:
       '@babel/core': ^7.0.0-0
     dependencies:
-      '@babel/core': 7.20.12_supports-color@7.2.0
+      '@babel/core': 7.20.12
       '@babel/helper-plugin-utils': 7.20.2
       '@babel/plugin-syntax-optional-catch-binding': 7.8.3_@babel+core@7.20.12
 
@@ -1731,7 +1734,7 @@ packages:
     peerDependencies:
       '@babel/core': ^7.0.0-0
     dependencies:
-      '@babel/core': 7.20.12_supports-color@7.2.0
+      '@babel/core': 7.20.12
       '@babel/helper-plugin-utils': 7.20.2
 
   /@babel/plugin-syntax-bigint/7.8.3_@babel+core@7.20.12:
@@ -1850,7 +1853,7 @@ packages:
     peerDependencies:
       '@babel/core': ^7.0.0-0
     dependencies:
-      '@babel/core': 7.20.12_supports-color@7.2.0
+      '@babel/core': 7.20.12
       '@babel/helper-plugin-utils': 7.20.2
 
   /@babel/plugin-syntax-optional-catch-binding/7.8.3_@babel+core@7.20.12:
@@ -1858,7 +1861,7 @@ packages:
     peerDependencies:
       '@babel/core': ^7.0.0-0
     dependencies:
-      '@babel/core': 7.20.12_supports-color@7.2.0
+      '@babel/core': 7.20.12
       '@babel/helper-plugin-utils': 7.20.2
 
   /@babel/plugin-syntax-optional-chaining/7.8.3_@babel+core@7.20.12:
@@ -1980,7 +1983,7 @@ packages:
     peerDependencies:
       '@babel/core': ^7.0.0-0
     dependencies:
-      '@babel/core': 7.20.12_supports-color@7.2.0
+      '@babel/core': 7.20.12
       '@babel/helper-create-regexp-features-plugin': 7.20.5_@babel+core@7.20.12
       '@babel/helper-plugin-utils': 7.20.2
 
@@ -2517,6 +2520,7 @@ packages:
       globals: 11.12.0
     transitivePeerDependencies:
       - supports-color
+    dev: true
 
   /@babel/types/7.20.7:
     resolution: {integrity: sha512-69OnhBxSSgK0OzTJai4kyPDiKTIe3j+ctaHdIGVbRahTLAT7L3R9oeXHC2aVSuGYt3cVnoAMDmOCgJ2yaiLMvg==}
@@ -10243,6 +10247,7 @@ packages:
     dependencies:
       ms: 2.1.2
       supports-color: 7.2.0
+    dev: true
 
   /debuglog/1.0.1:
     resolution: {integrity: sha512-syBZ+rnAK3EgMsH2aYEOLUW7mZSY9Gb+0wUMCFsZvcmiz+HigA0LOcq/HoQqVuGG+EKykunc7QG2bzrponfaSw==}