JSLint Error: Unexpected 'this'

Question

Having trouble understanding why JSLint is surprised by my use of this in the following code:

Answer 1

'use strict';

var SudoConstructor = (function () {

    /* We need bind, < IE9 needs a (tiny) polyfill */

    function protoEsqDeclare(sudoThis) {
        return sudoThis;
    }

    function protoEsqSet(sudoThis, newValA, newValB) {
        sudoThis.valA = newValA;
        sudoThis.valB = newValB;
    }

    function instanceCreator(valA, valB) {
        var sudoThis = {
            valA: valA,
            valB: valB
        };

        return {
            declare: protoEsqDeclare.bind(null, sudoThis),
            set: protoEsqSet.bind(null, sudoThis)
        };

    }

    return instanceCreator;

}());