fix: No Capability to BigInt?

[Slarper]

Description

When plainToInstance converted a plain object contains bigint fields, it crashed and output:

 Cannot mix BigInt and other types, use explicit conversions

Minimal code-snippet showcasing the problem

import 'reflect-metadata';
import { plainToInstance } from 'class-transformer';
class ExampleClass {
  // Define a bigint field
  public largeNumber: bigint;

  constructor(initialValue: bigint) {
    this.largeNumber = initialValue;
  }

  // A method to add a value to the bigint field
  public addToLargeNumber(value: bigint): void {
    this.largeNumber += value;
  }

  // A method to retrieve the bigint field
  public getLargeNumber(): bigint {
    return this.largeNumber;
  }
}
const publicKey2 = plainToInstance(ExampleClass , {largeNumber:10086n})[0];

Expected behavior

It should convert the object successfully.

Actual behavior

It crashed.

[diffy0712]

Hello @Slarper,

I am unable to reproduce your error with the example you've provided. It works for me as expected.

What environment you run this in? ts version and ts target?

Does it work for you if you add the @Type(() => BigInt) type decorator on top of your bigint field?

Also why do you have [0]; at the end of your plainToInstance? It will not return an array.

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