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MethodDecorator gets TS2322/TS2315 #17936

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@Norgerman

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@Norgerman
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TypeScript Version: 2.4.2
Code

export function route(method: string, path: string): MethodDecorator {
    return (target: any, name: string, descriptor: TypedPropertyDescriptor<Function>) => {
        routeManager.regeisterRoute({
            constructor: target.constructor,
            function: descriptor.value,
            method,
            path
        });
    }
}
export function route(method: string, path: string): MethodDecorator<Function> {
    return (target: any, name: string, descriptor: TypedPropertyDescriptor<Function>) => {
        routeManager.regeisterRoute({
            constructor: target.constructor,
            function: descriptor.value,
            method,
            path
        });
    }
}

Expected behavior:
No error
Actual behavior:

error TS2322: Type '(target: any, name: string, descriptor: TypedPropertyDescriptor<Function>) => void' is not assignable to type 'MethodDecorate
or'.
  Types of parameters 'descriptor' and 'descriptor' are incompatible.
    Type 'TypedPropertyDescriptor<T>' is not assignable to type 'TypedPropertyDescriptor<Function>'.
      Type 'T' is not assignable to type 'Function'.
error TS2315: Type 'MethodDecorator' is not generic.
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    BugA bug in TypeScriptA bug in TypeScriptDomain: DecoratorsThe issue relates to the decorator syntaxThe issue relates to the decorator syntax

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