What is the pubspec.yaml file and what does it do?

The pubspec.yaml file is a crucial configuration file in a Flutter project that specifies the project's dependencies, metadata, and resources. It is similar to the package.json file in Node.js or the Gemfile in Ruby[1].

The pubspec.yaml file serves several key purposes:

1. Metadata: It includes information about the Flutter application or package, such as the name, description, version, and author details[1][3].

2. Dependencies: It specifies the external packages or libraries that the Flutter application or package depends on, along with their version constraints[1][2][3]. This allows Flutter's package manager to understand what packages to download and install before building the app.

3. Assets: The pubspec.yaml file is used to list the assets (such as images, fonts, and configuration files) that are included in the app package[3][4].

4. Fonts: Custom fonts used in the app can be specified in the pubspec.yaml file[3].

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