How to use the null function from is

fuzzer.js

GitHub: gretaio/google-cloud-node

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var is = require('is');
var isNumber = is.number;
var isObject = is.object;
var isString = is.string;
var isArray = is.array;
var isNull = is.null;
var isFunction = is.function;

function Fuzzer() { }

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setup.js

GitHub: 54dxs/gbook

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/**
 * Check that a value is defined (not null nor undefined)
 */
toBeDefined: function() {
    expect.assert(
        !(is.undefined(this.actual) || is.null(this.actual)),
        'expected to be defined'
    );
    return this;
},

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+ 3 other calls in file