Skip to content

Instantly share code, notes, and snippets.

@wentout

wentout/v8bug.js

Created August 15, 2024 13:45
Show Gist options
  • Save wentout/33372239a179c2bd831e783407d30091 to your computer and use it in GitHub Desktop.
Save wentout/33372239a179c2bd831e783407d30091 to your computer and use it in GitHub Desktop.
Download ZIP
new v8 version bug since node.js 22
Raw
v8bug.js
'use strict';
// though Error.prototype.stack is non standard
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/stack
const myErrorObject = new Error('my error');
myErrorObject.prop = 123;
const hop = (o, p) => Object.prototype.hasOwnProperty.call(o, p);
// nodejs v20 & v22 it works properly
console.log(hop(myErrorObject, 'stack'));
// and for Firefox this property above just does not exists at all
// hop(Object.getPrototypeOf(myErrorObject), 'stack');
const myIntermediateObject = {};
Object.setPrototypeOf(myIntermediateObject, myErrorObject);
console.log(myIntermediateObject instanceof Error);
myIntermediateObject.stack = myErrorObject.stack;
// it doesn't matter which value you assign there,
// for example uncomment the next line
// myIntermediateObject.stack = 'myErrorObject.stack';
myIntermediateObject.prop = 123;
// this works properly for node.js v20, but not for v22
console.log(':', hop(myIntermediateObject, 'stack'));
console.log(':', hop(myIntermediateObject, 'prop'));
const myCorrectedObject = {};
Object.setPrototypeOf(myCorrectedObject, myErrorObject);
console.log(myCorrectedObject instanceof Error);
Object.defineProperty(myCorrectedObject, 'stack', {
get() {
return myErrorObject.stack;
}
});
// nodejs v20 & v22 it works properly
console.log(hop(myCorrectedObject, 'stack'));
// so for objects with Error in prototoype chain
// it optimizes .stack property
// general behaviour works correctly for both
const base = {
stack: 'str',
prop: 123
};
const sup = {};
Object.setPrototypeOf(sup, base);
sup.stack = 'str';
sup.prop = 123;
console.log(hop(sup, 'stack'));
console.log(hop(sup, 'prop'));
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment