miru-project/miru-app

Extension import: type 'Null' is not a subtype of type 'String' in type cast (@license)

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#307 opened on Nov 21, 2024

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help wanted

Description

Brief summary

I'm following the "getting started" guide to write my own extension: https://miru.js.org/en/developer/2-extension/

When doing that, I get an error when importing the extension:

type 'Null' is not a subtype of type 'String' in type cast

Steps to reproduce

  1. Create extension.js file
  2. Add meta data as described on https://miru.js.org/en/developer/2-extension/#write-metadata
  3. Import extension
  4. Get error

It fails when loading the "license" meta tag. This is missing from the documentation.

Miru version

v1.8.1-22-g8599d0d

Device

Debian Linux

Acknowledgements

  • I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
  • If this is an issue with a extension, I should be opening an issue in the extension repository.

Contributor guide

Tech stack
dartflutter
Domain
developer experience
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Familiarity with Flutter/DartBasic understanding of extension metadata
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80
Research direction
The bug occurs when loading extension metadata, specifically the 'license' field. The code likely expects a non null string but receives null. Investigate the extension parsing logic (e.g., in lib/models/extension.dart or similar). Check if the metadata schema requires a default value or null handling. Also review the documentation to ensure the 'license' field is optional or defaulted. A fix would involve making the 'license' field nullable or providing a default empty string.