Stats

[Rich-Harris]

This is branched off of #1298. See #1257 for more info — for now, this just adds timings.

• performance timings (done, but can still be fleshed out)
• imports
• used lifecycle hooks
• used components
• declared methods
• expected data properties
• computed properties
• warnings

[codecov-io]

Codecov Report

Merging #1299 into master will decrease coverage by 0.01%.
The diff coverage is 90.9%.

@@            Coverage Diff             @@
##           master    #1299      +/-   ##
==========================================
- Coverage   91.51%   91.49%   -0.02%     
==========================================
  Files         124      125       +1     
  Lines        4417     4467      +50     
  Branches     1390     1398       +8     
==========================================
+ Hits         4042     4087      +45     
- Misses        154      156       +2     
- Partials      221      224       +3

Impacted Files	Coverage Δ
src/validate/index.ts	89.79% <ø> (ø)	⬆️
src/generators/Generator.ts	93.86% <100%> (+0.04%)	⬆️
src/generators/dom/index.ts	96.06% <100%> (ø)	⬆️
src/generators/server-side-rendering/index.ts	93.93% <100%> (ø)	⬆️
src/index.ts	88.4% <100%> (+2.19%)	⬆️
src/Stats.ts	86.11% <86.11%> (ø)

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[Rich-Harris]

There are more things that could be added to stats, but on YAGNI grounds I'm going to leave it there for now — I have what I need to make the REPL changes I had in mind.

Adding things like expectedProperties and components will be beneficial when it comes to whole-app optimisation and discarding JS for non-interactive Sapper pages, but we can cross those bridges when we come to them. Removing the WIP