When listing a Component's model, show the function signature of a value

[sirlancelot]

If the value of a property of a Vue data model is a function. Vue Devtools currently just shows "Function" as the value. It would be neat if it showed the function signature instead (eg. "function someFunction(arg)").

You can get the signature by calling .toString() on the function and getting everything up to the closing parenthesis:

if (typeof value === "function") {
    const valueStr = value.toString()
    return valueStr.slice(0, valueStr.indexOf(")") + 1)
}

[posva]

Definitely. PR are welcome!