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Something like...

// Allow extensions to register modules
wfRunHooks( 'ResourceLoaderBeforeRespond', $context );

...inside of ResourceLoader::respond().

(In reply to comment #1)
> Something like...
> 
> // Allow extensions to register modules
> wfRunHooks( 'ResourceLoaderBeforeRespond', $context );
> 
Pretty much yeah, except the second parameter is an array of parameters.

> ...inside of ResourceLoader::respond().
Because there are more ResourceLoader:: functions that use registrations, I'd prefer having a function called by all such entry points that then calls this hook once and only once.

In practical terms, something like

protected static function getHookRegistrations( $context ) {
    static $done = false;
    wfRunHooks( 'ResourceLoaderRegistrations', array( $context ) );
    $done = true;
}

Then in all functions using the registration data (including respond(), but also other functions reading from self::$modules), call this function.

This has been done for a while now. The hook is called ResourceLoaderRegisterModules.

Then why isn't it documented in doc/hooks.txt ?

It is as of r73686 - thanks for noticing.