output { js, css, ast } from svelte.compile

[Rich-Harris]

Ref #795. This replaces the existing hodgepodge...

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

...with something a bit saner:

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

js and css are both { code, map } objects.

The old properties are preserved (to the extent possible, by giving the css object String.prototype methods) in a way that should be non-breaking in all but the most edgy of cases (tested with rollup-plugin-svelte and svelte-loader). Once plugins have had a chance to update, we can start adding deprecation warnings, before a removal in v2.

Next up, #1257.

[codecov-io]

Codecov Report

Merging #1298 into master will decrease coverage by <.01%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #1298      +/-   ##
==========================================
- Coverage   91.66%   91.65%   -0.01%     
==========================================
  Files         122      122              
  Lines        4332     4339       +7     
  Branches     1367     1369       +2     
==========================================
+ Hits         3971     3977       +6     
  Misses        148      148              
- Partials      213      214       +1

Impacted Files	Coverage Δ
src/css/Stylesheet.ts	90.1% <100%> (ø)	⬆️
src/generators/dom/index.ts	96.06% <66.66%> (ø)	⬆️
src/generators/server-side-rendering/index.ts	93.84% <75%> (ø)	⬆️
src/generators/Generator.ts	93.78% <90%> (-0.15%)	⬇️

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