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:The second Dart-to-JavaScript compiler was frog.<ref>{{Cite web |title=Towards a single Dart to JavaScript compiler |date=10 September 2019 |url=https://news.dartlang.org/2012/02/towards-single-dart-to-javascript.html |access-date=2023-05-13 |language=en}}</ref> Written in Dart, it was introduced in 2013 and deprecated in 2020. This should not be confused with Dart Frog,<ref>{{Cite web |title=Dart Frog |url=https://dartfrog.vgv.dev/ |access-date=2023-05-13 |website=dartfrog.vgv.dev |language=en}}</ref> an open-source Dart framework for building backend systems from [[Very Good Ventures]].
:The third Dart-to-JavaScript compiler is <code>dart2js</code>. Introduced in Dart 2.0,<ref>{{Cite web |last=Moore |first=Kevin |date=2018-08-08 |title=Announcing Dart 2 Stable and the Dart Web Platform |url=https://medium.com/dartlang/dart-2-stable-and-the-dart-web-platform-3775d5f8eac7 |access-date=2023-05-13 |website=Dart |language=en}}</ref> the Dart-based <code>dart2js</code> evolved from earlier compilers. It intended to implement the full Dart language specification and semantics. Developers use this compiler for production builds. It compiles to [[Minification (programming)|minified JavaScript]].
:The fourth Dart-to-JavaScript compiler is <code>dartdevc</code>.<ref>{{Cite web |title=dartdevc: The Dart development compiler |url=https://dart.dev/tools/dartdevc.html |access-date=2023-05-13 |website=dart.dev |language=en }}{{Dead link|date=April 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Developers could use this compiler for development builds. It compiles to human-readable JavaScript. On March 28, 2013, the Dart team posted an update on their blog addressing Dart code compiled to JavaScript with the <code>dart2js</code> compiler,<ref>{{cite web |last=Ladd |first=Seth |date=2013-03-28 |title=Dart News & Updates: Why dart2js produces faster JavaScript code from Dart |url=http://news.dartlang.org/2013/03/why-dart2js-produces-faster-javascript.html |access-date=2013-07-21 |website=News.dartlang.org.}}</ref> stating that it now runs faster than handwritten JavaScript on [[V8 (JavaScript engine)|Chrome's V8 JavaScript engine]] for the DeltaBlue benchmark.<ref>{{cite web |title=Dart Performance |url=http://www.dartlang.org/performance/ |url-status=dead |archive-url=https://web.archive.org/web/20170103041945/http://www.dartlang.org/performance/ |archive-date=2017-01-03 |access-date=2013-07-21 |website=Dartlang.org.}}</ref>
:Prior to Dart 2.18, both <code>dart2js</code> and <code>dartdevc</code> could be called from the command line. Dart 2.18 folded these functions into the Dart SDK. This removed the direct command line wrappers but kept the two compilers. The <code>webdev serve</code> command calls the <code>dartdevc</code> compiler. The <code>webdev build</code> command calls the <code>dart2js</code> compiler.
:The Dart SDK compiles to JavaScript in two ways.
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