BigInt.prototype.valueOf()
 The valueOf() method returns the wrapped primitive value of a BigInt object. 
Syntax
bigIntObj.valueOf()
Return value
A BigInt representing the primitive value of the specified BigInt object.
Examples
Using valueOf
typeof Object(1n); // object typeof Object(1n).valueOf(); // bigint
Specifications
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
| valueOf | 67 | 79 | 68 | No | 54 | 14 | 67 | 67 | 68 | 48 | 14 | 9.0 | 
See also
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    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/valueOf