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this.files.get is not a function when combining file

See original GitHub issue

Laravel Mix Version: 6.0.32 (npm list --depth=0)
Node Version (node -v): v14.18.0
NPM Version (npm -v): 6.14.15
OS:

Description:

I update some packages today, and seems it need node >14.17, so I installed new node and yarn. rimraf node_modules, reinstall packages, when I run watch I got these error.

Steps To Reproduce:

// webpack mix

mix.styles(
    [
        "node_modules/quill/dist/quill.core.css",
        "node_modules/quill/dist/quill.snow.css"
    ],"themes/css/editor.css")

yarn run watch

(node:28032) UnhandledPromiseRejectionWarning: TypeError: this.files.get is not a function at ConcatenateFilesTask.watch (D:\xampp\htdocs\lrv\node_modules\laravel-mix\src\tasks\Task.js:23:32) at D:\xampp\htdocs\lrv\node_modules\laravel-mix\src\webpackPlugins\CustomTasksPlugin.js:30:57 at Array.forEach (<anonymous>) at D:\xampp\htdocs\lrv\node_modules\laravel-mix\src\webpackPlugins\CustomTasksPlugin.js:30:36 (Use node --trace-warnings ... to show where the warning was created) (node:28032) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)