Typecheck for argument/dictionary field default values

[saschanaz]

interface mixin Mixin {
  void op(optional boolean arg = 3); // no!
};

dictionary Dict {
  DOMString str = true; // no!
};

See also whatwg/webidl#750 (comment).

[TG1999]

Hi I will like to work on this issue, can you explain how can I solve this issue ?

[saschanaz]

I think this one is rather complex and not adequate for first contributions because we should make sure typedefs and unions are correctly examined. We'll want to modify *validate() in lib/productions/argument.js and check whether the argument type allows the value type.

Note for me: Maybe some helper functions:

• valueToType(defaultValue): Receives a default value and returns the possible type(s) of it.
• includesType(baseType, targetType): Receives two types and returns a boolean that indicates the baseType includes targetType or not. Should include some caching to prevent infinite recursion (fix(validation): prevent infinite recursion #362 😁).

[TG1999]

Okay thanks can you suggest me some issues for first timers

[saschanaz]

#220 seems easy enough if you know how modules work in modern JavaScript. 👍 We want to export WebIDLParseError so that package users can import it.

[TG1999]

Yeah I know how to export modules can you tell the filename which I have to export so I can send a PR for it ASAP. :)

[saschanaz]

It's in lib/tokeniser.js, we want to export it to and again from index.js.

[TG1999]

Any more issues for first timers 😄 . I will also like to work on any new feature if you can guide me.

[TG1999]

@saschanaz Any more issues for first-timers, I will also like to work on any new feature if you can guide me.

[saschanaz]

I suggest #415 where we need a webpack configuration to turn off class name mangling. This would be more of searching documentations and possibly also StackOverflow, and then writing some test.

The error object we exported in #428 should have err.constructor.name === "WebIDLParseError" but currently #415 makes it _, so we want to fix it.

[TG1999]

I am not able to get how to get started with it, some guidance will be surely helpful for me in this case.

[TG1999]

Hi @saschanaz any more issues on which I can work or any new feature which I can make for webidl2.js if you can guide me I can surely make some good features for webidl2.js and will surely learn something new while making the features.

[TG1999]

I will like to learn the working of web standards and contribute in it so will like to do anything related to it. I will read the docs in the meantime and come back to you when done.