isNativeErrorRaw
Returns true
if the value was returned by the constructor of a built-in Error
type.
console.log(util.types.isNativeError(new Error())); // true
console.log(util.types.isNativeError(new TypeError())); // true
console.log(util.types.isNativeError(new RangeError())); // true
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Subclasses of the native error types are also native errors:
class MyError extends Error {}
console.log(util.types.isNativeError(new MyError())); // true
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A value being instanceof
a native error class is not equivalent to isNativeError()
returning true
for that value. isNativeError()
returns true
for errors which come from a different realm while instanceof Error
returns false
for these errors:
const vm = require('node:vm');
const context = vm.createContext({});
const myError = vm.runInContext('new Error()', context);
console.log(util.types.isNativeError(myError)); // true
console.log(myError instanceof Error); // false
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Conversely, isNativeError()
returns false
for all objects which were not returned by the constructor of a native error. That includes values which are instanceof
native errors:
const myError = { __proto__: Error.prototype };
console.log(util.types.isNativeError(myError)); // false
console.log(myError instanceof Error); // true
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Since
v10.0.0