const { js, css } = svelte.compile(...)

[Rich-Harris]

This is a relatively minor aesthetic thing, but the current API doesn't treat CSS as a first-class citizen. Rather than this...

const { code, map, css, cssMap, ast } = svelte.compile(...);

...I think we should have this:

const { js, css, ast } = svelte.compile(...);

console.log(js.code); // string
console.log(js.map);  // object with toString method

console.log(css.code); // string
console.log(css.map);  // object with toString method

This can be done as a non-breaking change with a deprecation warning (until v2, when we'd switch over to the new API) by returning an object on which code, map and cssMap were getters that printed the warning, and by adding a toString method on css that also printed the warning.

[Rich-Harris]

Then again v2 will change the return value to a Promise, so perhaps it makes sense to wait until then.