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

[cweiske]

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.

[OshekharO]

@cweiske Can you mention the website you trying to make extension out of? And also the particular code of section where you are getting null type error?

Or you can continue the conversation here also https://t.me/MiruChat

[cweiske]

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

The documentation does not say that the @license meta data is required. This is what needs to be fixed.

After adding the @license meta data line the error disappeared.