TeaVM
=====
What is TeaVM?
--------------
In short, TeaVM gets a bytecode, running over JVM, and translates it to the JavaScript code,
which does exactly the same thing as the original bytecode does.
It is based on its cross-compiler which transforms `class` files to JavaScript.
But there is something more:
* a sophisticated per-method dependency manager, which greatly reduces the JavaScript output;
* an optimizer capable of things like devirtualization, inlining, constant propagation,
loop invariant motion and many other;
* implementation of subset of core Java library;
How to use
----------
There are some options of using TeaVM. One is the maven build. First, you write your code as if it were an
ordinary Java project:
package org.teavm.samples;
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, world!");
}
}
Second, you include the following dependency in your `pom.xml`:
org.teavm
teavm-classlib
0.0.1-SNAPSHOT
provided
Third, you add `teavm-maven-plugin` in your build configuration:
org.teavm
teavm-maven-plugin
0.0.1-SNAPSHOT
generate-javascript
build-javascript
process-classes
true
org.teavm.samples.HelloWorld
Now you can execute `mvn clean package` and get the generated JavaScript file `target/javascript/classes.js`.
It contains the `main` global function, which you may call. In the general case you should provide
an HTML page, which includes both of
[runtime.js](https://github.com/konsoletyper/teavm/blob/master/teavm-core/src/main/resources/org/teavm/javascript/runtime.js)
and `classes.js` files and calls `main` function in some condition. Here is an example: