next/dist/esm/lib/is-error.js

The React Framework

import { isPlainObject } from '../shared/lib/is-plain-object';
/**
 * 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) {
    return typeof err === 'object' && err !== null && 'name' in err && 'message' in err;
}
function safeStringify(obj) {
    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) {
    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 Object.defineProperty(new Error('An undefined error was thrown, ' + 'see here for more info: https://nextjs.org/docs/messages/threw-undefined'), "__NEXT_ERROR_CODE", {
                value: "E98",
                enumerable: false,
                configurable: true
            });
        }
        if (err === null) {
            return Object.defineProperty(new Error('A null error was thrown, ' + 'see here for more info: https://nextjs.org/docs/messages/threw-undefined'), "__NEXT_ERROR_CODE", {
                value: "E336",
                enumerable: false,
                configurable: true
            });
        }
    }
    return Object.defineProperty(new Error(isPlainObject(err) ? safeStringify(err) : err + ''), "__NEXT_ERROR_CODE", {
        value: "E394",
        enumerable: false,
        configurable: true
    });
}

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