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TypeScript error: Initializer of instance member variable cannot reference identifier declared in the constructor.

In a TypeScript application we are building, we have code similar to the following:

However when we try to run this, TypeScript complains with the following error message:

Error      19           Initializer of instance member variable 'processAllOrders' cannot reference identifier 'that' declared in the constructor.             

I think it’s a bug in TypeScript as I don’t see any reason why this shouldn’t work.

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