Is `DeclarationRaws#value` property optional?

Summary

The DeclarationRaws#value property is required on the current PostCSS type definitions:

https://github.com/postcss/postcss/blob/0ab7a6ff80803ee4c9658a11d4932dcf5cc280bb/lib/declaration.d.ts#L21-L27

But actually, the property can be optional.

const src = "a { background: linear-gradient(to right, #fff, #ddd) }";
postcss.parse(src).walkDecls((decl) => {
  console.log(decl.raws.value.raw);
                     // ↑ undefined
});

See the following reproduction for details.

Reproduction

Type-checking passes, but running the code raises an error:

https://gist.github.com/ybiquitous/eabe11abd1ecb1feae79614ed12502bb

Environment

PostCSS 8.4.8

[ai]

Released in 8.4.11.

[ybiquitous]

@ai Thank you for the quick fix! 😄