How to use the @0x/base-contract.methodAbiToFunctionSignature function in @0x/base-contract

public getFunctionSignature(methodName: string): string {
        const index = this._methodABIIndex[methodName];
        const methodAbi = CoordinatorRegistryContract.ABI()[index] as MethodAbi; // tslint:disable-line:no-unnecessary-type-assertion
        const functionSignature = methodAbiToFunctionSignature(methodAbi);
        return functionSignature;
    }
    public getABIDecodedTransactionData(methodName: string, callData: string): T {

public getFunctionSignature(methodName: string): string {
        const index = this._methodABIIndex[methodName];
        const methodAbi = IWalletContract.ABI()[index] as MethodAbi; // tslint:disable-line:no-unnecessary-type-assertion
        const functionSignature = methodAbiToFunctionSignature(methodAbi);
        return functionSignature;
    }
    public getABIDecodedTransactionData(methodName: string, callData: string): T {

public getFunctionSignature(methodName: string): string {
        const index = this._methodABIIndex[methodName];
        const methodAbi = CoordinatorContract.ABI()[index] as MethodAbi; // tslint:disable-line:no-unnecessary-type-assertion
        const functionSignature = methodAbiToFunctionSignature(methodAbi);
        return functionSignature;
    }
    public getABIDecodedTransactionData(methodName: string, callData: string): T {

public getFunctionSignature(methodName: string): string {
        const index = this._methodABIIndex[methodName];
        const methodAbi = DummyERC20TokenContract.ABI()[index] as MethodAbi; // tslint:disable-line:no-unnecessary-type-assertion
        const functionSignature = methodAbiToFunctionSignature(methodAbi);
        return functionSignature;
    }
    public getABIDecodedTransactionData(methodName: string, callData: string): T {

public getFunctionSignature(methodName: string): string {
        const index = this._methodABIIndex[methodName];
        const methodAbi = IAssetDataContract.ABI()[index] as MethodAbi; // tslint:disable-line:no-unnecessary-type-assertion
        const functionSignature = methodAbiToFunctionSignature(methodAbi);
        return functionSignature;
    }
    public getABIDecodedTransactionData(methodName: string, callData: string): T {

public getFunctionSignature(methodName: string): string {
        const index = this._methodABIIndex[methodName];
        const methodAbi = IValidatorContract.ABI()[index] as MethodAbi; // tslint:disable-line:no-unnecessary-type-assertion
        const functionSignature = methodAbiToFunctionSignature(methodAbi);
        return functionSignature;
    }
    public getABIDecodedTransactionData(methodName: string, callData: string): T {