TypeScript Version:

1.8.9

Code

export class Configuration {
    private storage: string;

    constructor() {
        this.storage = "InMemoryStorageProvider()";
    }

    public useLocalStorage(): void {
        // This method will be injected via the prototype.
    }    
}

import { Configuration } from './classes/Configuration';

Configuration.prototype.useLocalStorage = function() {
    this.storage = "NodeFileStorageProvider"
};

Expected behavior:

When walking the AST I use:

let identifier: ts.Identifier = <ts.Identifier>node;
let identifierSymbol: ts.Symbol = this.checker.getSymbolAtLocation( identifier );

to obtain the identifier and its possible associated symbol when the node is SyntaxKind.Identifier.

for the first 2 references to the private property storage, I obtain the identifier and the symbol (which correctly have the same Id). With the prototype function assigned to useLocalStorage the reference to storage the call to this.checker.getSymbolAtLocation( identifier ) does not return a symbol.

Actual behavior:

I am using the AST to identify identifiers which may be minified/shortened. The 1st and 2nd reference to storage gets shortened as it is a private property.

My expectation was that the reference to storage would have the same symbol ( not undefined ) as the other references to the storage property.