This is consistent with what we're pretty much already doing, and saves us from making the request during code review.
These were all autofixed and most of them seem easier to read. Some in the legacy services should be rewritten in more legible forms during refactor (ie using intermediate variables, or using request’s qs option). There are some in helper functions and elsewhere that should get rewritten separately. I don't want to change them in this PR because the changes will get lost in this diff, though we could identify them here and fix them before or just after.
I had to track down the right lint rule for this. We have no-useless-rename for destructuring and import/export. The one for object literals is object-shorthand.
Ref: #1379
This takes a naive approach to font-width computation, the most compute-intensive part of rendering badges.
1. Add the widths of the individual characters.
- These widths are measured on startup using PDFKit.
2. For each character pair, add a kerning adjustment
- The difference between the width of each character pair, and the sum of the characters' separate widths.
- These are computed for each character pair on startup using PDFKit.
3. For a string with characters outside the printable ASCII character set, fall back to PDFKit.
This branch averaged 0.041 ms in `makeBadge`, compared to 0.144 ms on master, a speedup of 73%. That was on a test of 10,000 consecutive requests (using the `benchmark-performance.sh` script, now checked in).
The speedup applies to badges containing exclusively printable ASCII characters. It wouldn't be as dramatic on non-ASCII text. Though, we could add some frequently used non-ASCII characters to the cached set.
