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ERROR-HANDLING.md

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Error handling with electron-fetch

Because window.fetch isn't designed to transparent about the cause of request errors, we have to come up with our own solutions.

The basics:

  • All operational errors are rejected as FetchError, you can handle them all through promise catch clause.

  • All errors comes with err.message detailing the cause of errors.

  • All errors originated from electron-fetch are marked with custom err.type.

  • All errors originated from Electron's net module are marked with err.type = 'system', and contains addition err.code and err.errno for error handling, they are alias to error codes thrown by Node.js core.

  • Programmer errors are either thrown as soon as possible, or rejected with default Error with err.message for ease of troubleshooting.

List of error types:

  • Because we maintain 100% coverage, see test.js for a full list of custom FetchError types, as well as some of the common errors from Electron

The limits:

  • If the servers responds with an incorrect or unknown content-encoding, Electron's net module throws an uncatchable error... (see electron/electron#8867).