Problem:
Running the command npm run watch throws and error
54% building 35/41 modules 6 active /app/docroot/themes/custom/mytheme/node_modules/css-loader/index.js??ref--10-2!/app/docroot/themes/custom/mytheme/node_modules/postcss-loader/src/index.js??postcss5!/app/docroot/themes
ERROR Failed to compile with 1 errors 1:25:50 AM
error
Cannot read property 'map' of undefined
15 assets
ERROR in Cannot read property 'map' of undefined
[Browsersync] Proxying: https://ps.lndo.site
The Error happens only when the following code is included in my webpack.mix.js file:
mix.imagemin({
patterns: [{
from: '**/*.{png,gif,jpg,jpeg,svg}',
to: 'images/',
context: 'src/images/'
}, {
from: '**/*.{png,gif,jpg,jpeg,svg}',
to: 'images/',
context: 'src/components/'
}]
});
Removing the above snippet removes the error but the previous developers on this project had this for a reason.
I recently updated due to security vulnerabilities and managed to debug a different issue that Copy Plugin introduced a breaking change (already updated in the code above). However I am unsure that I have all of the configuration correct.
This I have tried: From the command line
rm -rf node_modules
rm package.lock
npm cache clean --force
npm install
These are the packages in package.json current as of August 27, 2020
"devDependencies": {
"bootstrap": "^4.3.1",
"browser-sync": "^2.26.12",
"browser-sync-webpack-plugin": "^2.2.2",
"copy-webpack-plugin": "^6.0.3",
"cross-env": "^7.0.2",
"husky": "^4.2.5",
"imagemin-webpack-plugin": "^2.4.2",
"jquery": "^3.5.1",
"laravel-mix": "^5.0.4",
"laravel-mix-imagemin": "^1.0.3",
"popper.js": "^1.16.1",
"pretty-quick": "^2.0.1",
"resolve-url-loader": "^3.1.1",
"sass": "^1.26.10",
"sass-loader": "^8.0.2",
"vue-template-compiler": "^2.6.11"
},
"dependencies": {
"throttle-debounce": "^2.3.0"
}
The packages updated were the following
"browser-sync": "^2.26.7",
"copy-webpack-plugin": "^5.1.1",
"husky": "^4.2.3",
"jquery": "^3.5.0",
"sass": "^1.26.3",
"throttle-debounce": "^2.1.0"
To me this looks like a bug in the laravel-mix-imagemin plugin. Its NPM page says that "The patterns parameter is automatically converted to an array". But this doesn't comply with the copy-webpack-plugin^6 you are using (which is used under the hood by laravel-mix-imagemin), as version 6 doesn't accept an array anymore. (Too bad the laravel-mix-imagemin plugin doesn't list its dependencies and their versions properly ...)
BTW: I had basically the same issue, and the error message you get is a catastrophe.