Description

If we try to convert a value that has typeof string, then in some cases it returns the wrong value. e.g value: 'true' will return true, while on the other hand value: 'false' will also return the true.

Minimal code-snippet showcasing the problem
Consideration: A network access request.

import { Expose, plainToInstance } from 'class-transformer';

class RoleDTO {
  @Expose()
    id: number
  @Expose()
  canAccess: boolean
}
plainToInstance(RoleDTO, { id: 1, canAccess: 'true' }, { enableImplicitConversion: true })
plainToInstance(RoleDTO, { id: 2, canAccess: 'false' }, { enableImplicitConversion: true })

Expected behavior

RoleDTO with the id:1 should have canAccess: true and RoleDTO with the id:2 should have canAccess: false

Actual behavior

RoleDTO with id 1, and 2 have canAccess: true

This is a common JS Boolean conversion issue, I will be submitting a PR for this.