Convert to using TS, ESM, eslint, vitest, prettier

also, refactor the API to be more consistent and predictable, and to better match existing patterns, e.g.:
• the removeEventListener/cleanup function is returned by invoking onscrolling(), rather than being invoked as onscrolling.remove()
• the event payload is now a consistent { scrollX: number; scrollY: number } object
• onscrolling now has only a single function signature, and the scroll direction is specified via an optional options object as the 2nd argument (defaults to 'vertical')

.gitignore

@@ -10,12 +10,12 @@ pids
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov
 
+# Build
+dist
+
 # Coverage directory used by tools like istanbul
 coverage
 
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
 # Compiled binary addons (http://nodejs.org/api/addons.html)
 build/Release
 

.prettierignore

@@ -0,0 +1,2 @@
+node_modules
+dist

README.md

@@ -54,13 +54,12 @@ Tests use Mocha + Should.js + Sinon. Using `npm test` will run the tests in head
 
 ## TODO
 
-- [ ] Add optional param to specify an object other than `window` to monitor for scroll events
-- [ ] Expose `measure` and `mutate` functions to attach handlers specifically to the measuring (read) or mutating (write) portion of each cycle to minimize layout calculations
+-   [ ] Add optional param to specify an object other than `window` to monitor for scroll events
+-   [ ] Expose `measure` and `mutate` functions to attach handlers specifically to the measuring (read) or mutating (write) portion of each cycle to minimize layout calculations
 
 ## Misc
 
-*Note: This package was formerly known as [jank-free-onscroll][]*
-
+_Note: This package was formerly known as [jank-free-onscroll][]_
 
 [html5rocks-tutorial]: http://www.html5rocks.com/en/tutorials/speed/animations/#debouncing-scroll-events
 [raf-caniuse]: http://caniuse.com/#feat=requestanimationframe