Getting 'Uncaught TypeError: Right-hand side of 'instanceof' is not callable' when doing simple validation

[ftom2]

Versions:

• VueJs: 2.4.2
• Vee-Validate: 2.0.0-rc.12
• Chrome: Version 60.0.3112.101 (Official Build) (64-bit)

Description:

I have a modal with a text input field:

<input type="text" class="form-control" id="tenantName" placeholder="Tenant Name"
                   v-model="name" name="name" v-validate="'required|min:3'" :disabled="!!id">
            <span class="text-danger error" v-show="errors.has('name')">{{ errors.first('name')}}</span>

As soon as I start to type something in the field i get this error:

VM1134:1 Uncaught TypeError: Right-hand side of 'instanceof' is not callable
    at eval (eval at fn (vee-validate.js?e134:3670), <anonymous>:1:5)
    at VueComponent.fn (vee-validate.js?e134:2384)
    at Watcher.run (vue.esm.js?efeb:2972)
    at flushSchedulerQueue (vue.esm.js?efeb:2724)
    at Array.eval (vue.esm.js?efeb:701)
    at nextTickHandler (vue.esm.js?efeb:648)
    at <anonymous>

I tracked the error to this line:
if (args.length === 0 || args[0] instanceof Event)

Seems like a JS thing since when trying to run "a" instanceof Event I get the same error

Steps To Reproduce:

Create a simple input field like:

<input type="text" class="form-control" id="tenantName" placeholder="Tenant Name"
                   v-model="name" name="name" v-validate="'required|min:3'" :disabled="!!id">
            <span class="text-danger error" v-show="errors.has('name')">{{ errors.first('name')}}</span>

and once you start typing you should see the error.

[logaretm]

Could be related to #679 and #722, in short if you are overwriting Event constructor of the window, you shouldn't as it is a native constructor that is needed for multiple reasons, and it could be needed for other libraries out there as well. I can add a check for it in future versions.