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import { isPlainObject } from '../shared/lib/is-plain-object'
// We allow some additional attached properties for Next.js errors
export interface NextError extends Error {
type?: string
page?: string
code?: string | number
cancelled?: boolean
digest?: number
}
/**
* Checks whether the given value is a NextError.
* This can be used to print a more detailed error message with properties like `code` & `digest`.
*/
export default function isError(err: unknown): err is NextError {
return (
typeof err === 'object' && err !== null && 'name' in err && 'message' in err
)
}
function safeStringify(obj: any) {
const seen = new WeakSet()
return JSON.stringify(obj, (_key, value) => {
// If value is an object and already seen, replace with "[Circular]"
if (typeof value === 'object' && value !== null) {
if (seen.has(value)) {
return '[Circular]'
}
seen.add(value)
}
return value
})
}
export function getProperError(err: unknown): Error {
if (isError(err)) {
return err
}
if (process.env.NODE_ENV === 'development') {
// provide better error for case where `throw undefined`
// is called in development
if (typeof err === 'undefined') {
return new Error(
'An undefined error was thrown, ' +
'see here for more info: https://nextjs.org/docs/messages/threw-undefined'
)
}
if (err === null) {
return new Error(
'A null error was thrown, ' +
'see here for more info: https://nextjs.org/docs/messages/threw-undefined'
)
}
}
return new Error(isPlainObject(err) ? safeStringify(err) : err + '')
}
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