Add support for ESM tailwind config file

cli/export.js

@@ -4,13 +4,13 @@ const crypto = require('crypto')
 const replace = require('replace-in-file')
 const { resolveConfigToJson } = require('../lib/tailwindConfigUtils')
 
-module.exports = function (outputDir, configPath) {
+module.exports = async function (outputDir, configPath) {
   outputDir = path.resolve(process.cwd(), outputDir)
 
   fs.removeSync(outputDir)
   fs.mkdirSync(outputDir)
 
-  const configJson = resolveConfigToJson(configPath)
+  const configJson = await resolveConfigToJson(configPath)
   const configFileName = generateConfigFileNameFromJson(configJson)
 
   fs.writeFileSync(path.resolve(outputDir, configFileName), configJson)

cli/index.js

@@ -12,10 +12,11 @@ program
   .action(args => {
     require('../server')({
       port: args.port,
-      tailwindConfigProvider: () => {
+      tailwindConfigProvider: async () => {
         const configPath = resolveConfigPath(program.config)
         delete require.cache[configPath]
-        return require(configPath)
+        const config = await import(configPath)
+        return config.default || config
       },
       shouldOpen: args.open
     }).start()

lib/tailwindConfigUtils.js

@@ -17,9 +17,9 @@ const resolveConfig = config => {
   return transformConfig(resolveTailwindConfig(config))
 }
 
-const resolveConfigToJson = configPath => {
-  const tailwindConfig = require(configPath)
-  return JSON.stringify(resolveConfig(tailwindConfig))
+const resolveConfigToJson = async (configPath) => {
+  const config = await import(configPath)
+  return JSON.stringify(resolveConfig(config.default || config))
 }
 
 const transformConfig = config => {

package.json

@@ -35,7 +35,7 @@
     "lib"
   ],
   "engines": {
-    "node": ">=8"
+    "node": ">=13"
   },
   "dependencies": {
     "@koa/router": "^12.0.1",