dart2js缩小和树木摇晃期间的保存方法 [英] Preserving methods during dart2js minification and tree-shaking

问题描述

我有一些文件，我写在dart，我想编译为javascript和包括在我的Android应用程序中运行的几个html文件。

I have a few files that I have written in dart that I want to compile to javascript and include in a few html files that are running in my Android application.

文件由一个main方法组成，然后有一个api层，有3个函数，其他javascript代码将在运行时调用。非常重要的是，我尽可能少地使用dart的库（所以树摇动是必须的），当树摇动/缩小过程发生时，我需要确保3 api层函数不被重命名/优化出来，因为它认为他们没有被调用？

The files consist of a main method, then there is an api layer with 3 functions that other javascript code will call at run-time. It's very important that I include as little of dart's libraries as possible (so tree-shaking is a must), and when the tree-shaking / minification process happens, I need to ensure that the 3 api layer functions don't get renamed / optimized out because it thinks they aren't being called?

如何告诉dart2js单独留下某些函数的签名，而不是修剪它们，因为它认为

How do I tell dart2js to leave the signature of certain functions alone, and not to prune them out because it thinks they aren't being used?

推荐答案

您可以使用 dart：js / code>属性，一个 JsObject ，它允许您将变量和方法从dart暴露到JavaScript，并且将由dart2js保存。在你的main方法中，只需包括 context ['jsMethodName'] = dartMethodName ，然后在你的JavaScript中调用它。示例如下：

You can use the dart:js library's context property, a JsObject which allows you to expose variables and methods from dart to JavaScript, and will be preserved by dart2js. In your main method, simply include context['jsMethodName'] = dartMethodName, and then call it in your JavaScript. Here's an example:

library.dart

import 'dart:js';

void main(){
  print("main called!");
  context['myMethod'] = myMethod;
}

void myMethod(){
  print("My Method Called!");
}

index.html
$ b

index.html

<script src="library.dart.js"></script>
<script>
  console.log(myMethod());
</script>

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