Coding is as much a matter of personal growth as it is of logic and control-flow. I keep patience, curiosity, & exuberance in the same toolbox as vim and git.
*Opinions posted are my own*
it depends on how it's used
optional chaining will have some effect,
if you don't use tslib, there could be significant duplication of code across a large project
also typescript prefers certain constructs like typeguard functions, which a javascript developer wouldn't necessarily have written
edit: that being said, typescript can do some work in types which javascript would have had to do at run time, so there could be some byte-savings there, if conscientiously applied
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it depends on how it's used
optional chaining will have some effect,
if you don't use tslib, there could be significant duplication of code across a large project
also typescript prefers certain constructs like typeguard functions, which a javascript developer wouldn't necessarily have written
edit: that being said, typescript can do some work in types which javascript would have had to do at run time, so there could be some byte-savings there, if conscientiously applied