feature(injector): PartialFactory

[timvandam]

Summary of changes

Utility PartialFactory type that makes it easy to resolve providers when instantiating non-provider classes.

class A {
    constructor (public readonly b: B, public readonly num: number) {
    }
}

class B {
    public b = 'b';
}

const injector = Injector.from([B]);
const factory = injector.get<PartialFactory<A>>();

const a = factory({
    num: 5,
});
// A { B { b: 'b' }, num: 5 }

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[codecov-commenter]

Codecov Report

Merging #487 (99720e2) into master (a47111c) will increase coverage by 0.12%.
The diff coverage is 92.59%.

❗ Current head 99720e2 differs from pull request most recent head 3bb7984. Consider uploading reports for the commit 3bb7984 to get more accurate results

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@@            Coverage Diff             @@
##           master     #487      +/-   ##
==========================================
+ Coverage   78.44%   78.57%   +0.12%     
==========================================
  Files         175      175              
  Lines       18644    18695      +51     
  Branches     4867     4882      +15     
==========================================
+ Hits        14625    14689      +64     
+ Misses       4019     4006      -13     

Files	Coverage Δ
packages/injector/src/injector.ts	84.11% <92.59%> (+2.70%)	⬆️

... and 1 file with indirect coverage changes

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[timvandam]

Had to change this to support creating factories for interfaces without having to Inject<.> every property. Interface properties always have a property.type.indexAccessOrigin set, which triggers config lookup. Without this change it would always return undefined (which was undesirable behavior in the first place I think)

[marcj]

Yeah this broke some stuff. Fixed in c4ed83a

[marcj]

awesome, thanks!