contactsnag

ContactSnag

Bugsnag utilities for Contactlab’s applications.

This package embeds 2 main functionalities:

• Javascript wrapper for Bugsnag: importing ContactSnag in your code gives you access to a “lazy” and “side-effect aware” Bugsnag client that exposes the same APIs of the original SDK.
• Webpack plugin: ContactSnag exposes (as dependecy) the webpack-bugsnag-plugins in order to upload sourcemaps and report builds using Webpack (take a look here for available configuration).

It is fully written in TypeScript and extensively uses fp-ts library.

Requirements

• TypeScript >= v4.1.0
• fp-ts >= v2.8.0
• io-ts >= v2.2.10

Installation

Get the latest version from NPM registry:

$ npm install contactsnag fp-ts io-ts --save

# -- or --

$ yarn add contactsnag fp-ts io-ts

ContactSnag Client

The package exposes a single ContactSnag function.

This receives a configuration object and returns a ContactSnag client:

declare function ContactSnag(conf: Config): Client;

Config is a kind of subset of Bugsnag’s configuration options with some differences:

• appVersion, enabledReleaseStages, and releaseStage are required properties;
• endpoints and enabledBreadcrumbTypes cannot be set/overwritten.

Client is a custom data structure which embeds some Bugsnag.Client features, guarantees a lazy initialization and that an error is raised if a wrong configuration is passed.

interface Client {
  readonly client: () => ActualClient;

  readonly start: () => void;

  readonly notify: (
    error: Bugsnag.NotifiableError,
    onError?: Bugsnag.OnErrorCallback
  ) => IOEither<Error, void>;

  readonly setUser: (user: Bugsnag.User) => IOEither<Error, void>;
}

The ActualClient type encodes the three different states of the ContactSnag client:

type ActualClient = ConfigError | Still | Started;

ConfigError represents a not valid configuration provided to the client’s creation function:

interface ConfigError {
  readonly type: 'ConfigError';
  readonly error: Error;
}

Still represents a not started client:

interface Still {
  readonly type: 'Still';
  readonly config: Config;
}

Started represents a started client:

interface Started {
  readonly type: 'Started';
  readonly bugsnag: Bugsnag.Client;
}

Each time a Client’s method is called, it will internally check (a.k.a. fold) the current state and execute an operation.

client()

Returns the current ActualClient.

start()

Starts the client if it’s in the Still state, otherwise it does nothing.

notify()

Returns a void effectful operation that can fail (IOEither).

When the IO is ran:

• if the client is in the Started state, it will notify an error to Bugsnag or will fail if the Bugsnag client raises an exception;
• if the client is in the ConfigError state, it will return a Left<Error> (“configuration error”);
• if the client is in the Still state, it will return a Left<Error> (“not yet started error”).

Usage example

Notify Bugsnag with a custom error message:

import {ContactSnag} from 'contactsnag';

const client = ContactSnag({
  apiKey: 'TEST-API-KEY',
  appVersion: '1.2.3',
  enabledReleaseStages: ['production'],
  releaseStage: 'production'
});

// Set notification on button click
document.getElementById('btn').addEventListener('click', () =>
  client.notify(new Error('Custom error message'), event => {
    event.addMetadata('custom', 'errname', 'My error name');
  })()
);

// Start Bugsnag
client.start();

setUser()

Returns a void effectful operation that can fail (IOEither).

When the IO is ran:

• if the client is in the Started state, it will set the provided user on the Bugsnag client;
• if the client is in the ConfigError state, it will return a Left<Error> (“configuration error”);
• if the client is in the Still state, it will return a Left<Error> (“not yet started error”).

Usage example

Set a user for the entire session:

import {ContactSnag} from 'contactsnag';

const client = ContactSnag({
  apiKey: 'TEST-API-KEY',
  appVersion: '1.2.3',
  enabledReleaseStages: ['production'],
  releaseStage: 'production'
});

// Start Bugsnag
client.start();

// Set user after 1 second
setTimeout(() => {
  client.setUser({id: '1'})();
}, 1000);

Contributing

Opening issues is always welcome.

Then, fork the repository or create a new branch, write your code and send a pull request.

This project uses Prettier (automatically applied as pre-commit hook), ESLint (with TypeScript integration) and Jest.

Tests are run with:

$ npm test

License

Apache 2.0.

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