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// merged from next.js
// https://github.com/vercel/next.js/blob/e657741b9908cf0044aaef959c0c4defb19ed6d8/packages/next/src/lib/is-error.ts
// https://github.com/vercel/next.js/blob/e657741b9908cf0044aaef959c0c4defb19ed6d8/packages/next/src/shared/lib/is-plain-object.ts
export default function isError(err: unknown): err is Error {
return (
typeof err === 'object' && err !== null && 'name' in err && 'message' in err
)
}
export function getProperError(err: unknown): Error {
if (isError(err)) {
return err
}
if (process.env.NODE_ENV === 'development') {
// Provide a better error message for cases where `throw undefined`
// is called in development
if (typeof err === 'undefined') {
return new Error('`undefined` was thrown instead of a real error')
}
if (err === null) {
return new Error('`null` was thrown instead of a real error')
}
}
return new Error(isPlainObject(err) ? JSON.stringify(err) : err + '')
}
function getObjectClassLabel(value: any): string {
return Object.prototype.toString.call(value)
}
function isPlainObject(value: any): boolean {
if (getObjectClassLabel(value) !== '[object Object]') {
return false
}
const prototype = Object.getPrototypeOf(value)
/**
* this used to be previously:
*
* `return prototype === null || prototype === Object.prototype`
*
* but Edge Runtime expose Object from vm, being that kind of type-checking wrongly fail.
*
* It was changed to the current implementation since it's resilient to serialization.
*/
return prototype === null || prototype.hasOwnProperty('isPrototypeOf')
}
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