Dart SDK Target

The Target class provides a way to define settings and behaviors that are specific to each compilation target (such as web, mobile, server).

This allows Dart to be truly cross-platform, enabling the same codebase to be compiled and run effectively in different environments.

Each target has a unique name, identifying the specific platform or configuration it represents (e.g., iOS, Android, Web).

A global Map targets in pkg/kernel/lib/target/targets.dart contains all the targets:

final Map<String, _TargetBuilder> targets = <String, _TargetBuilder>{
  'none': (TargetFlags flags) => new NoneTarget(flags),
};

In the compilation process, installAdditionalTargets(tool/_fasta/additional_targets.dart:20) will set all the supported targets.

Note: installAdditionalTargets is also the first of the compilation, so finding its usage will get all the compiling methods in the Dart SDK.

Library Management

Required Libraries (extraRequiredLibraries): This is a list of essential libraries for the target, excluding the default dart:core. It ensures that the necessary libraries are loaded and available during compilation.
Platform-Specific Libraries (extraRequiredLibrariesPlatform): These are additional libraries needed specifically for compiling the Dart platform itself. This feature is useful for maintaining compatibility and functionality across different versions or configurations.
Indexed Libraries (extraIndexedLibraries): These libraries are indexed for the CoreTypes index, helping in the efficient resolution of core types and classes, excluding some specific core libraries.

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