There’s a .precompiled.js file along .js and .js.map files the dart2js compiler produces. Compiling the code
void main() {
print('Hello, stranger.');
}
results in identical .js and .precompiled.js files except that the latter contains the extra lines:
function dart_precompiled($collectedClasses){var $desc
return[]}
A Google search reveals nothing except some obscure issues in the tracker, referencing something called CSP, which in itself is unsearchable.
So, what this .precompiled.js is?