Nested Error ES6 class
npm install --save nerror
An abstract example
const NError = require('nerror');
try {
try {
try {
let error = new Error('Some DB error');
error.code = 42000;
throw error;
} catch (error) {
throw new NError(error, { sqlState: error.code }, 'Could not insert row');
}
} catch (error) {
throw new NError(error, { customerId: 9000 }, 'Could not create user');
}
} catch (error) {
console.log(error.messages, JSON.stringify(error.info, undefined, 4));
/* Could not create user: Could not insert row: Some DB error {
"sqlState": 42000,
"customerId": 9000
} */
console.log(error.fullStack);
/* NError: Could not create user
at Object.<anonymous> (/home/ross/tmp/nerror/test.js:13:15)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:393:7)
at startup (bootstrap_node.js:150:9)
at bootstrap_node.js:508:3
NError: Could not insert row
at Object.<anonymous> (/home/ross/tmp/nerror/test.js:10:19)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:393:7)
at startup (bootstrap_node.js:150:9)
at bootstrap_node.js:508:3
Error: Some DB error
at Object.<anonymous> (/home/ross/tmp/nerror/test.js:6:25)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:393:7)
at startup (bootstrap_node.js:150:9)
at bootstrap_node.js:508:3 */
}parent is optional parent error instance
info is optional information attached to the error. it will be merged with parents' info objects
...args - rest is usual Error constructor arguments
The following are all valid constructor calls:
-
new NError('Error occurred') // just like usual Error
-
new NError(new Error('Test'), 'Error occurred') // pass the parent
-
new NError({ someKey: "some value" }, 'Error occurred') // pass info
-
new NError(new NError('Some error'), { key: 'value' }, 'Error occurred') // do both
Parent error accessor
Combined information created by merging infos of all the parent chain
Combined messages of all the parents
Combined stack info of all the parents
Convert this error chain to an array. Consider the following example:
let err1 = new Error('1');
let err2 = new NError(err1, '2');
let err3 = new NError(err2, '3');
err3.toArray() will return: [ err3, err2, err1 ]
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