有什么方法可以改善 Dart (dart2js) 编译时间？

Question

I'm trying to move from TypeScript to Dart. TypeScript compiles almost immediately - Dart takes more than 5 seconds to compile a Hello World program! Am I missing something? Are there any possible ways to improve that?

Answer 1

TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.
So it (ts compiler) translates from a higher level programming language to a lower level programming language.

Dart is an open-source, scalable programming language, with robust libraries and runtimes.
So it (dart2js compiler) is a source-to-source compiler (transpiler) that takes the source code of a program written in one programming language as its input and produces the equivalent source code in another programming language.

I think that explains everything.

Answer 2

This is usually not much of an issue when developing with Dart because Dartium, a Chromium derivative executes Dart directly.

Only for testing compatibility with other browsers and for deployment it is necessary to build to JavaScript.

pub serve a Dart development web server does dart-to-js compilation on-the-fly with a lot of caching which usually improves transpilation times for reloads (after some warmup time) if you need JS during development with non-Dartium browsers.