path.js:204 throw new TypeError('Arguments to path.join must be strings');

path.js:204
throw new TypeError('Arguments to path.join must be strings');
^
TypeError: Arguments to path.join must be strings
at f (path.js:204:15)
at Object.filter (native)
at exports.join (path.js:209:40)
at Array.map (native)
at LESSCompiler.module.exports.LESSCompiler.getDependencies (C:\ECM\JS\Js_3\js_arch\node_modules\less-brunch\lib\index
.js:71:10)
at LESSCompiler.getDependencies (C:\ECM\JS\Js_3\js_arch\node_modules\less-brunch\lib\index.js:4:61)
at getDependencies (C:\Users\mailas\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\pipeline.js:40:23)
at C:\Users\mailas\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\pipeline.js:80:16
at C:\ECM\JS\Js_3\js_arch\node_modules\less-brunch\lib\index.js:49:16
at finish (C:\ECM\JS\Js_3\js_arch\node_modules\less-brunch\node_modules\less\lib\less\parser.js:434:40)
at C:\ECM\JS\Js_3\js_arch\node_modules\less-brunch\node_modules\less\lib\less\parser.js:94:48
at C:\ECM\JS\Js_3\js_arch\node_modules\less-brunch\node_modules\less\lib\less\index.js:116:17
at Object.Parser.parser.parse as parse
at C:\ECM\JS\Js_3\js_arch\node_modules\less-brunch\node_modules\less\lib\less\index.js:115:16
at fs.js:271:14
at Object.oncomplete (fs.js:107:15)

The error occurs in less-brunch's index.js at line 71, where path.join receives non-string arguments. Start by examining the LESSCompiler.getDependencies method in node_modules/less-brunch/lib/index.js to see how dependencies are collected. Check what types of values are being passed to path.join, and ensure they are strings. Running the brunch build with debugging may show the problematic input.

索引モデルが issue の本文から書いたものです。