Hi,

This might be a challenging question to answer. At our company we have an 
extensive suite of Angular 1 components which rely on an in-house metadata 
framework that allows for pages to be rendered via JSON metadata served by 
some APIs. We are in the process of moving this to Angular 2. One 
requirement we have is that data can be resolved and filtered by metadata, 
and the core framework is extensible, meaning some consumer of the 
framework can add additional pipes.

So, here's the main question: is it possible to get an instance of a 
PipeTransform with only a string, assuming that PipeTransform has been 
injected as a provider in the root (app) component. Because of the flexible 
nature of this tool, it is not possible to require developers to explicitly 
inject each PipeTransform implementing class into the MetadataFilter 
service. It needs to be able to get a PipeTransform from the app level, 
given only a string.

For more clarity, this is how this looked in angular 1:

var filterName = 'date'; // For example
var someFilter = $filter(filterName);

return someFilter(someData, filterArgs);

I'm looking forward to getting some feedback on this.

Thanks

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