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const ERROR_CODE_DELIMITER = '@'
/**
* Augments the digest field of errors thrown in React Server Components (RSC) with an error code.
* Since RSC errors can only be serialized through the digest field, this provides a way to include
* an additional error code that can be extracted client-side via `extractNextErrorCode`.
*
* The error code is appended to the digest string with a semicolon separator, allowing it to be
* parsed out later while preserving the original digest value.
*/
export const createDigestWithErrorCode = (
thrownValue: unknown,
originalDigest: string
): string => {
if (
typeof thrownValue === 'object' &&
thrownValue !== null &&
'__NEXT_ERROR_CODE' in thrownValue
) {
return `${originalDigest}${ERROR_CODE_DELIMITER}${thrownValue.__NEXT_ERROR_CODE}`
}
return originalDigest
}
export const extractNextErrorCode = (error: unknown): string | undefined => {
if (
typeof error === 'object' &&
error !== null &&
'__NEXT_ERROR_CODE' in error &&
typeof error.__NEXT_ERROR_CODE === 'string'
) {
return error.__NEXT_ERROR_CODE
}
if (
typeof error === 'object' &&
error !== null &&
'digest' in error &&
typeof error.digest === 'string'
) {
const segments = error.digest.split(ERROR_CODE_DELIMITER)
const errorCode = segments.find((segment) => segment.startsWith('E'))
return errorCode
}
return undefined
}
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