If you modify the compiler, you have to redistrbute the source indeed.
Notice the compiler does not include the standard library and the backends (native/node)
The Opa compiler will remain an AGPL project.
The standard library and the native backend will be licensed under the GPL license with the so-called ClassPath exception, like Java. The exception means you can link the GPL code with any code, opening the door to license your application under any license.
The forthcoming Node.js backend will be licensed under the MIT license.
One of the part of Opa is it's type inference, so you still can write JavaScript like code, but with the type being infered without the need to precise it most of the time.
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Very good idea for the chapter about Opa for OO dummies. You are absolutely right ;)
One of the part of Opa is it's type inference, so you still can write JavaScript like code, but with the type being infered without the need to precise it most of the time.