diff --git a/esbuild.mjs b/esbuild.mjs
index 10323f09..229feddf 100644
--- a/esbuild.mjs
+++ b/esbuild.mjs
@@ -4,6 +4,7 @@ import {readFileSync} from 'fs';
 import {writeFile} from 'fs/promises';
 import nib from 'nib';
 import path from 'path';
+import stylus from 'stylus';
 import ts from 'typescript';
 import * as url from 'url';
 import packageJson from './package.json' assert {type: 'json'};
@@ -73,8 +74,11 @@ const commonOptions = {
     loader: {'.styl': 'empty'},
     metafile: true
 };
-const stylus = stylusLoader({
-    stylusOptions: {import: [nib.path + '/nib/index.styl']}
+const stylusPlugin = stylusLoader({
+    stylusOptions: {
+        import: [nib.path + '/nib/index.styl'],
+        define: [['flex-version', [new stylus.nodes.Ident('flex')]]]
+    }
 });
 
 switch (process.argv[2]) {
@@ -86,7 +90,7 @@ switch (process.argv[2]) {
             outfile: path.join(distDir, output + '.js'),
             platform: 'browser',
             globalName: name && `self[${JSON.stringify(name)}]`,
-            plugins: [stylus],
+            plugins: [stylusPlugin],
             metafile: true,
             banner: {
                 js: "new EventSource('/esbuild').addEventListener('change', () => location.reload());"
@@ -121,7 +125,7 @@ switch (process.argv[2]) {
                             outfile: path.join(distDir, output + '.js'),
                             platform: 'browser',
                             globalName: `self[${JSON.stringify(name)}]`,
-                            plugins: [stylus]
+                            plugins: [stylusPlugin]
                         }),
                     name &&
                         build({
@@ -131,7 +135,7 @@ switch (process.argv[2]) {
                             outfile: path.join(distDir, output + '.min.js'),
                             platform: 'browser',
                             globalName: `self[${JSON.stringify(name)}]`,
-                            plugins: [stylus]
+                            plugins: [stylusPlugin]
                         }),
                     build({
                         ...commonOptions,
diff --git a/package-lock.json b/package-lock.json
index 869d50c3..c27119ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,7 +17,9 @@
                 "@playwright/browser-chromium": "^1.38.1",
                 "@types/jest": "^29.5.5",
                 "@types/mustache": "^4.2.3",
+                "@types/nib": "^1.1.2",
                 "@types/node": "^18.16.12",
+                "@types/stylus": "^0.48.43",
                 "@typescript-eslint/eslint-plugin": "^6.7.4",
                 "@typescript-eslint/parser": "^6.7.4",
                 "app-root-path": "^3.1.0",
@@ -3873,6 +3875,12 @@
             "integrity": "sha512-MG+oI3oelPKLN2gpkel08v6Tp6zU2zZQRq+eSpRsFtLNTd2kxZolOHQTmQQs0wqXTLOqs+ri3tRUaagH5u0quw==",
             "dev": true
         },
+        "node_modules/@types/nib": {
+            "version": "1.1.2",
+            "resolved": "https://registry.npmjs.org/@types/nib/-/nib-1.1.2.tgz",
+            "integrity": "sha512-czgRptAQeGoY8Td2l4joiTbKgH6W27vO4kAG3sdebcnhUtkEDjAtVR4/uz2ilLWeTVWioVRmhlT98c2oo4RUHA==",
+            "dev": true
+        },
         "node_modules/@types/node": {
             "version": "18.16.12",
             "resolved": "https://registry.npmjs.org/@types/node/-/node-18.16.12.tgz",
@@ -3891,6 +3899,15 @@
             "integrity": "sha512-Hl219/BT5fLAaz6NDkSuhzasy49dwQS/DSdu4MdggFB8zcXv7vflBI3xp7FEmkmdDkBUI2bPUNeMttp2knYdxw==",
             "dev": true
         },
+        "node_modules/@types/stylus": {
+            "version": "0.48.43",
+            "resolved": "https://registry.npmjs.org/@types/stylus/-/stylus-0.48.43.tgz",
+            "integrity": "sha512-72dv/zdhuyXWVHUXG2VTPEQdOG+oen95/DNFx2aMFFaY6LoITI6PwEqf5x31JF49kp2w9hvUzkNfTGBIeg61LQ==",
+            "dev": true,
+            "dependencies": {
+                "@types/node": "*"
+            }
+        },
         "node_modules/@types/tough-cookie": {
             "version": "4.0.2",
             "resolved": "https://registry.npmjs.org/@types/tough-cookie/-/tough-cookie-4.0.2.tgz",
diff --git a/package.json b/package.json
index c4429590..729f5c0f 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,9 @@
         "@playwright/browser-chromium": "^1.38.1",
         "@types/jest": "^29.5.5",
         "@types/mustache": "^4.2.3",
+        "@types/nib": "^1.1.2",
         "@types/node": "^18.16.12",
+        "@types/stylus": "^0.48.43",
         "@typescript-eslint/eslint-plugin": "^6.7.4",
         "@typescript-eslint/parser": "^6.7.4",
         "app-root-path": "^3.1.0",