1. auto generate types (thx for jsdoc)
2. use files section for reduce package size for now https://packagephobia.com/[email protected] and need check after publish new version

for future need migrate to https://tsup.egoist.sh/ for better experience for build lib

closes #7

a770bbe08f0ecf0507d2d3deb0ddd3362c7a5ee1 "factored out" charCodeAt and substring, saving some bytes. However, it also slightly slowed down parsing, too.

These two commits do the same for indexOf and the length assignment. This saves 27 bytes... and also slightly slows down parsing, like the aforementioned commit.

This allows a minifier to combine the let declarations into a single statement.

I'm typing this on my phone so I have no idea how much this will affect size, but I think it's at least ~~8~~ 6 bytes worth of savings.

Some unrelated commits:

• Inline convertToLength, with a special case for commas. Normally, it'd look like

  let to = source.indexOf(',', i);
  if (to < 0) {
    to = source.length;
  }
  if (newline < to) {
    to = newline;
  }
  

  but as we know that newline <= source.length, if to === source.length then the result of the second if statement is always to === newline - so we can merge them to

  let to = source.indexOf(',', i);
  if (to < 0 || newline < to) {
    to = newline;
  }
  

  This commit reduces the size down to 637 (-8) bytes, and seems to slightly improve performance too.

• Change all variable definitions in iters to be at the top-level as a let declaration. This saves repeatedly having lets and consts in the declaration. This also renames some variables so they can be shared to further reduce size. Note that char and index could be combined to one variable to save 2 bytes, but would make the code even more hard to understand than it currently is.

  This commit, with the above commit, reduces the size down to 599 (-38) bytes and doesn't seem to affect performance.

• Change === to ==, saving 6 bytes (down to 593) without negatively affecting performance.

• Change r to use a template string... saving 1 byte.

Feel free to cherry-pick certain parts of this PR if needed.