How to use the defined function from is

i18n.js

GitHub: exlcode/exlcode

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}
var LocalizeInfo;
(function (LocalizeInfo) {
    function is(value) {
        var candidate = value;
        return Is.defined(candidate) && Is.string(candidate.key) && (Is.undef(candidate.comment) || (Is.array(candidate.comment) && candidate.comment.every(function (element) { return Is.string(element); })));
    }
    LocalizeInfo.is = is;
})(LocalizeInfo || (LocalizeInfo = {}));
var BundledFormat;

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+ 3 other calls in file

vjs.dailymotion.js

GitHub: Rekall/Rekall

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is.a = is.type = function (value, type) {
  return typeof value === type;
};

/**
 * is.defined
 * Test if `value` is defined.
 *
 * @param {Mixed} value value to test
 * @return {Boolean} true if 'value' is defined, false otherwise

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