| // when T is any|unknown, Y is returned, otherwise N | |
| type IsAnyUnknown<T, Y, N> = unknown extends T ? Y : N; | |
| // when T is never, Y is returned, otherwise N | |
| type IsNever<T, Y = true, N = false> = [T] extends [never] ? Y : N; | |
| // when T is a tuple, Y is returned, otherwise N | |
| // valid tuples = [string], [string, boolean], | |
| // invalid tuples = [], string[], (string | number)[] |
FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
| # Hello, and welcome to makefile basics. | |
| # | |
| # You will learn why `make` is so great, and why, despite its "weird" syntax, | |
| # it is actually a highly expressive, efficient, and powerful way to build | |
| # programs. | |
| # | |
| # Once you're done here, go to | |
| # http://www.gnu.org/software/make/manual/make.html | |
| # to learn SOOOO much more. |
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