Upgrading from Angular v6 to v8: Troubleshooting the issue of "The loader "datatable.component.css" did not return a string error"

I am currently in the process of updating my Angular project from version 6 to version 8.

However, I encountered an error message in the console:

ERROR: The loader "foo/node_modules/@swimlane/ngx-datatable/release/components/datatable.component.css" did not return a string.

Upon investigating, I found an issue that was closed in an earlier version than the one I am using. Therefore, I opened a new issue instead. My current version is "@swimlane/ngx-datatable": "^15.0.2".

I am running the project with Ahead-of-Time (AOT) compilation:

ng serve --aot --proxy-config proxy.conf.js

This is a snippet of my package.json file:

"dependencies": {
   // Dependencies here
},
"devDependencies": {
   // Dev dependencies here
}

Here is a part of my angular.json configuration as well:

// Configuration details here

In an attempt to resolve the issue, I also tried customizing the webpack configuration with the specified rules, but unfortunately, it did not solve the problem.

How can I ensure that the datatable.component.css file loads correctly?

angulartypescriptnpmdependenciesngx-datatable

Answer №1

Upon upgrading from angular7 to 8, I encountered the same issue. Resolving it was a matter of adjusting the version of raw-loader to 1.0.0 in the package.json file and executing npm install.

{
    "name": "client-frontend",
    "version": "0.0.0",
    "license": "MIT",
    "scripts": {
        "ng": "ng",
        "start": "ng serve --aot",
        "build": "ng build ",
        "test": "ng test",
        "lint": "ng lint",
        "e2e": "ng e2e"
    },
    "private": true,
    "dependencies": {
        "@angular/animations": "^8.2.7",
        "@angular/cdk": "^8.2.0",
        "@angular/common": "^8.2.7",
        "@angular/compiler": "^8.2.7",
        "@angular/core": "^8.2.7",
        "@angular/forms": "^8.2.7",
        "@angular/http": "^7.2.15",
        "@angular/material": "^8.2.0",
        "@angular/platform-browser": "^8.2.7",
        "@angular/platform-browser-dynamic": "^8.2.7",
        "@angular/router": "^8.2.7",

        "raw-loader": "^1.0.0",
        "rimraf": "^3.0.0",
        "style-loader": "^1.0.0",
        "to-string-loader": "^1.1.5",
        "ts-node": "~8.4.1",
        "tslint": "~5.20.0",
        "typescript": "3.5.3"
    }
}

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