ESLint

gistfile1.js

    function findVariable(name) {
        var scope = context.getScope(),
            scopeVariable = [];

        function filter(variable) {
            return variable.name === name;
        }


        scopeVariable = scope.variables.filter(filter);
        if (scopeVariable.length === 0) {
            if (!scope.upper) {
                return null;
            }
            
            scope = scope.upper;
        } else {
            for (i = 0; i < scopeVariable.length; ++i) {
                scopeVariable = scope.variables.filter(filter);
                if (scopeVariable.length === 0) {
                    if (!scope.upper) {
                        return null;
                    }
                    
                    scope = scope.upper;
                }            
            }
        }

        return lookupVariable(scopeVariable[0]);
    }