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export const REACT_HYDRATION_ERROR_LINK =
'https://react.dev/link/hydration-mismatch'
export const NEXTJS_HYDRATION_ERROR_LINK =
'https://nextjs.org/docs/messages/react-hydration-error'
/**
* Only React 19+ contains component stack diff in the error message
*/
const errorMessagesWithComponentStackDiff = [
/^In HTML, (.+?) cannot be a child of <(.+?)>\.(.*)\nThis will cause a hydration error\.(.*)/,
/^In HTML, (.+?) cannot be a descendant of <(.+?)>\.\nThis will cause a hydration error\.(.*)/,
/^In HTML, text nodes cannot be a child of <(.+?)>\.\nThis will cause a hydration error\./,
/^In HTML, whitespace text nodes cannot be a child of <(.+?)>\. Make sure you don't have any extra whitespace between tags on each line of your source code\.\nThis will cause a hydration error\./,
]
export function isHydrationError(error: Error): boolean {
return (
isErrorMessageWithComponentStackDiff(error.message) ||
/Hydration failed because the server rendered (text|HTML) didn't match the client\./.test(
error.message
) ||
/A tree hydrated but some attributes of the server rendered HTML didn't match the client properties./.test(
error.message
)
)
}
export function isErrorMessageWithComponentStackDiff(msg: string): boolean {
return errorMessagesWithComponentStackDiff.some((regex) => regex.test(msg))
}
export function getHydrationErrorStackInfo(error: Error): {
message: string | null
notes: string | null
diff: string | null
} {
const errorMessage = error.message
if (isErrorMessageWithComponentStackDiff(errorMessage)) {
const [message, diffLog = ''] = errorMessage.split('\n\n')
const diff = diffLog.trim()
return {
message: diff === '' ? errorMessage.trim() : message.trim(),
diff,
notes: null,
}
}
const [message, maybeComponentStackDiff] = errorMessage.split(
`${REACT_HYDRATION_ERROR_LINK}`
)
const trimmedMessage = message.trim()
// React built-in hydration diff starts with a newline
if (
maybeComponentStackDiff !== undefined &&
maybeComponentStackDiff.length > 1
) {
const diffs: string[] = []
maybeComponentStackDiff.split('\n').forEach((line) => {
if (line.trim() === '') return
if (!line.trim().startsWith('at ')) {
diffs.push(line)
}
})
const [displayedMessage, ...notes] = trimmedMessage.split('\n\n')
return {
message: displayedMessage,
diff: diffs.join('\n'),
notes: notes.join('\n\n') || null,
}
} else {
const [displayedMessage, ...notes] = trimmedMessage.split('\n\n')
return {
message: displayedMessage,
diff: null,
notes: notes.join('\n\n'),
}
}
}
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