Incremental typescript conversion of core/Util.js #11009
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Typescript conversion of core/Util.js.
Summary
This PR contains an incremental approch to typescript conversion of core/Util.js. The goal is to remove L.Util as soon as the usages of its legacy leaflet js content is removed and rename core/CoolUtil.ts to core/Util.ts.
This PR also includes one functional change of unconditionally using window.requestAnimationFrame inside the wrapper L.Util.requestAnimFrame() as we are assuming the availability of window.requestAnimationFrame in canvas section container anyway.
TODO
[x] mocha tests for testable functions in CoolUtil.js
Checklist
make prettier-write
and formatted the code.make check
make run
and manually verified that everything looks okay