Dart
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dart:ui
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Built-in types and core primitives for a Flutter application. [...]
Core
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dart:async
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Support for asynchronous programming,
with classes such as Future and Stream. [...]
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dart:collection
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Classes and utilities that supplement the collection support in dart:core. [...]
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dart:convert
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Encoders and decoders for converting between different data representations,
including JSON and UTF-8. [...]
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dart:core
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Built-in types, collections,
and other core functionality for every Dart program. [...]
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dart:developer
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Interact with developer tools such as the debugger and inspector. [...]
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dart:math
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Mathematical constants and functions, plus a random number generator. [...]
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dart:typed_data
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Lists that efficiently handle fixed sized data
(for example, unsigned 8 byte integers) and SIMD numeric types. [...]
VM
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dart:io
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File, socket, HTTP, and other I/O support for non-web applications. [...]
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dart:isolate
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Concurrent programming using isolates:
independent workers that are similar to threads
but don't share memory,
communicating only via messages. [...]