What is Pubspec lock file?

Open the pubspec. yaml file located inside the app folder, and add css_colors: under dependencies .

lock file lets you test your package against the latest compatible versions of its dependencies . For application packages, we recommend that you commit the pubspec. lock file. Saving pubspec. lock ensures that everyone working on the app uses the exact same versions.

To use a package, do the following:

Packages, according to Flutterdocs, can be explained as “shared packages contributed by other developers to the Flutter and Dart ecosystems . This allows developers to quickly build an app without having to develop everything from scratch.”