Function extractErrorMessage

Extracts the original error message from a nested error. Can be used with any types of errors.

Example

const defaultError = new Error('bar')
const err = new NestedError('foo', defaultError)

// regular error
defaultError.message // 'bar'
extractErrorMessage(defaultError) // 'bar'

// nested error
err.message // 'foo\nCause: Error: bar'
extractErrorMessage('foo') // 'foo'
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