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Use classes.

class Console {
    log(...args) {
        console.log(...args);
        return this;
    }

    warn(...args) {
        console.warn(...args);
        return this;
    }

    error(...args) {
        console.error(...args);
        return this;
    }
}

const con = new Console();

con
    .log("Hello")
    .warn("You really shouldn't do that")
    .error("Danger!");

Or if you're stuck with ES5:

var con = {
    log: function () {
        console.log.apply(console, arguments);
        return this;
    },
    warn: function () {
        console.warn.apply(console, arguments);
        return this;
    },
    error: function () {
        console.error.apply(console, arguments);
        return this;
    }
};

con
    .log("Hello")
    .warn("You really shouldn't do that")
    .error("Danger!");