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import isError from '../../lib/is-error'
export function isHydrationError(error: unknown): boolean {
return (
isError(error) &&
(error.message ===
'Hydration failed because the initial UI does not match what was rendered on the server.' ||
error.message === 'Text content does not match server-rendered HTML.')
)
}
export function isHydrationWarning(message: unknown): message is string {
return (
isHtmlTagsWarning(message) ||
isTextInTagsMismatchWarning(message) ||
isTextWarning(message)
)
}
type NullableText = string | null | undefined
// https://github.com/facebook/react/blob/main/packages/react-dom/src/__tests__/ReactDOMHydrationDiff-test.js used as a reference
const htmlTagsWarnings = new Set([
'Warning: Expected server HTML to contain a matching <%s> in <%s>.%s',
'Warning: Did not expect server HTML to contain a <%s> in <%s>.%s',
])
const textAndTagsMismatchWarnings = new Set([
'Warning: Expected server HTML to contain a matching text node for "%s" in <%s>.%s',
'Warning: Did not expect server HTML to contain the text node "%s" in <%s>.%s',
])
const textWarnings = new Set([
'Warning: Text content did not match. Server: "%s" Client: "%s"%s',
])
export const getHydrationWarningType = (
message: NullableText
): 'tag' | 'text' | 'text-in-tag' => {
if (typeof message !== 'string') {
// TODO: Doesn't make sense to treat no message as a hydration error message.
// We should bail out somewhere earlier.
return 'text'
}
const normalizedMessage = message.startsWith('Warning: ')
? message
: `Warning: ${message}`
if (isHtmlTagsWarning(normalizedMessage)) return 'tag'
if (isTextInTagsMismatchWarning(normalizedMessage)) return 'text-in-tag'
return 'text'
}
const isHtmlTagsWarning = (message: unknown) =>
typeof message === 'string' && htmlTagsWarnings.has(message)
const isTextInTagsMismatchWarning = (msg: unknown) =>
typeof msg === 'string' && textAndTagsMismatchWarnings.has(msg)
const isTextWarning = (msg: unknown) =>
typeof msg === 'string' && textWarnings.has(msg)
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