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Generates Java annotated with JsInterop from JavaScript extern sources
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javatests/jsinterop/generator Mark native JsType interface with @FunctionalInterface. Oct 23, 2019

JsInterop Generator · Build Status

The jsinterop generator is a java program that takes closure extern files as input and generates Java classes annotated with JsInterop annotations.

This project is used for building Elemental2. Any other uses are experimental. You can use it to generate java APIs for other javascript libraries but we don't provide any official support. Feel free to open issues on the github issue tracker, though.

Run with Bazel

If your project use Bazel. You can use the skylark rule jsinterop_generator to generate java code.

You need to add this repository as an external dependency in your WORKSPACE file

  name = "com_google_jsinterop_generator",

and then define a jsinterop_generator target in your 'BUILD' file

load("@com_google_jsinterop_generator//:jsinterop_generator.bzl", "jsinterop_generator")

    name = "my_thirdparty_lib",
    srcs = ["my_externs.js"],

You can now directly depend on :my_thirdparty_lib target in your java_library rules or build the jar files with bazel build //path/to/your/BUILD/file/directory:my_thirdparty_lib. The jar files with the generated source will created in bazel-bin/path/to/your/BUILD/file/directory.

Run as a standalone java program

Build the generator from source

  • You need to install Bazel.

  • clone this repository with git: git clone

  • Inside the repository, have bazel build the jar file:

    $ bazel build //java/jsinterop/generator/closure:ClosureJsinteropGenerator_deploy.jar
  • The generated jar file can be found at bazel-bin/java/jsinterop/generator/closure/ClosureJsinteropGenerator_deploy.jar

Or download the generator

TODO(dramaix): provides link to download the generator.

Run the generator

Now you have the jar file, just invoke

java -jar /path/to/ClosureJsinteropGenerator_deploy.jar [options] externs_file...

List of required options :

Option Meaning
--output file Path to the jar file that will contain the generated java classes
--output_dependency_file file Path to the dependency file generated by the generator.
--package_prefix string Prefix used when we build the java package
--extension_type_prefix string Value used for prefixing extension types. It's a good practice to pass the name of the library in upper camel case.


Please refer to the contributing document.


Please refer to the license file.


This is not an official Google product.

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