- Typically, J4TS can be used as a runtime for transpilers, so that you can use the Java APIs in your transpiled Java programs. So far, J4TS main target is the JSweet transpiler, but it is not limited to it.
J4TS currently covers most of the core Java API supported by GWT (
java.io). It does not support
java.math yet because the GWT implementation requires a deep Java emulation, which is not consistent with the JSweet approach (so
java.math should be implemented as a wrapper for bignumber.js for instance).
J4TS is intended to be completed on-the-fly as more use cases are needed. So feel free to contribute.
import List = java.util.List; import ArrayList = java.util.ArrayList; import Set = java.util.Set; import HashSet = java.util.HashSet; import Map = java.util.Map; import HashMap = java.util.HashMap; var l: List<String> = new ArrayList<String>(); l.add("a"); l.add("b"); l.add("c"); assertEquals("[a, b, c]", l.toString()); assertEquals(l.indexOf("a"), 0); var s: Set<String> = new HashSet<String>(); s.add("a"); s.add("a"); s.add("b"); s.add("c"); s.add("c"); assertEquals(3, s.size()); assertTrue(s.contains("c")); var s: Map<String, String> = new HashMap<String, String>(); s.put("a", "aa"); s.put("b", "bb"); s.put("c", "cc"); assertEquals("bb", s.get("b"));
How to use
From TypeScript, you can compile with:
From JSweet, add the candy dependency in your
<dependency> <groupId>org.jsweet</groupId> <artifactId>j4ts</artifactId> <version>VERSION</version> </dependency>
How to modify/package
You can compile, package and install the J4TS candy in your local Maven repository by running Maven in the project's directory:
> mvn install
J4TS is meant to serve the public interest and be as open as possible. So anyone is more than welcome to contribute as long as it does not deviate J4TS from its initial goals stated above. When you meet a class or a method that is not supported, please feel free to contribute under the terms of the license.
J4TS is licensed under the Apache Open Source License version 2.