Typescript Favorites

custom-errors.ts

/*
In this file, we subclass the built-in Error object to create custom errors.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error
*/
// tslint:disable:max-classes-per-file

abstract class CustomError extends Error {
  constructor(...params: any[]) {
    // Pass remaining arguments (including vendor specific ones) to parent constructor
    super(...params);

    // Maintains proper stack trace for where our error was thrown (only available on V8)
    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, CustomError);
    }
  }

  get name() {
    // Get error name from class name
    return this.constructor.name;
  }
}

export class Foo extends CustomError {}

throw new Foo("oops!");
/*
▶ ts-node src/lib/errors.ts

/Users/alukach/Projects/devseed/maap/maap-api-query-service/src/lib/errors.ts:20
export class Foo extends CustomError {}
^
Foo: oops!
    at new Foo (/Users/alukach/Projects/devseed/maap/maap-api-query-service/src/lib/errors.ts:20:1)
    at Object.<anonymous> (/Users/alukach/Projects/devseed/maap/maap-api-query-service/src/lib/errors.ts:22:7)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Module.m._compile (/Users/alukach/.config/yarn/global/node_modules/ts-node/src/index.ts:439:23)
    at Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Object.require.extensions.(anonymous function) [as .ts] (/Users/alukach/.config/yarn/global/node_modules/ts-node/src/index.ts:442:12)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:754:12)
*/