Incorrect return type for `tagValueProcessor` and `attributeValueProcessor` in XmlBuilderOptions

[monholm]

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Description

Both tagValueProcessor and attributeValueProcessor are declared as returning a string, but the function should allow returning the value as is (which is also the default).

Code

const xmlBuilder = new XMLBuilder({tagValueProcessor: (name, value) => value});

Output

Type '(name: string, value: unknown) => unknown' is not assignable to type '(name: string, value: unknown) => string'.
  Type 'unknown' is not assignable to type 'string'.ts(2322)
fxp.d.ts(65, 3): The expected type comes from property 'tagValueProcessor' which is declared here on type 'Partial<XmlBuilderOptions>'

expected data

No typescript error.

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