stringify `header` and `cast` options: "no overload matches this call"

[Enrico Sacchetti]

Describe the bug

csv-stringify@6.4.0

I'm using stringify to cast output values within a file stream, but I see a type warning:

No overload matches this call.
The last overload gave the following error.
Argument of type { header: boolean; cast: { boolean: (value: boolean, ctx: CastingContext) => string | boolean; }; } is not assignable to parameter of type Input.
Object literal may only specify known properties, and header does not exist in type any[].

My code runs fine. This warning gives the impression that header and cast are mutually exclusive.

When I remove header, I see a different warning:

No overload matches this call.
The last overload gave the following error.
Argument of type { cast: { boolean: (value: boolean, ctx: CastingContext) => string | boolean; }; } is not assignable to parameter of type Input.
Object literal may only specify known properties, and cast does not exist in type any[].

To Reproduce

Here's my code:

fs.createReadStream(inFile)
  // ...
  .pipe(stringify({
    header: isOutFileNew,
//  ^^^^^ warning
    cast: {
      boolean: (value, ctx) => {
        if (ctx.header) return value
        if (ctx.column === 'Removed' && value === false) {
          return '0'
        }
        return String(value)
      }
    }
  }))

Additional context

My guess is the overloaded functions aren't being determined in the correct oder, where Input is being inferred instead of Options:

node-csv/packages/csv-stringify/lib/index.d.ts

Lines 120 to 121 in 22f4017

 declare function stringify(options: Options, callback?: Callback): Stringifier 
 declare function stringify(input: Input, callback?: Callback): Stringifier 

[Worms David]

Thank you for reporting your issue. TS is not my thing, if anyone interested into fixing this issue, please reproduce first the warning in a test before fixing.

[Worms David]

I reproduce your issue. It was related to an invalid return type, if (ctx.header) return value shall be if (ctx.header) return String(value).