TypeScript env a tad slow?

[plondon]

Hey @raxod502! I've noticed that the typescript execution env can be particularly slow, sometimes taking around 10sec to perform simple tasks, like console.logs. Any idea how that can be improved?

[raxod502]

I see this as well:

0 riju@admin:/src$ make sandbox L=typescript  
L=typescript node backend/sandbox.js
Starting session with UUID 14127ad3a0d94e6a9f1019479736a75b
riju@typescript:~/src$ time run </dev/null
ts-node -i -e "$(< main.ts)"
Hello, world!
> 
real    0m2.658s
user    0m1.524s
sys     0m0.077s
riju@typescript:~/src$ time run </dev/null
ts-node -i -e "$(< main.ts)"
Hello, world!
> 
real    0m4.293s
user    0m2.373s
sys     0m0.128s
riju@typescript:~/src$ time run </dev/null
ts-node -i -e "$(< main.ts)"
Hello, world!
> 
real    0m5.115s
user    0m2.866s
sys     0m0.139s
riju@typescript:~/src$ time run </dev/null
ts-node -i -e "$(< main.ts)"
Hello, world!
> 
real    0m4.468s
user    0m2.579s
sys     0m0.083s

It looks like disabling type-checking (per https://github.com/TypeStrong/ts-node#typechecking) speeds it up a lot, but then there's not so much point to using TypeScript...

riju@typescript:~/src$ time ts-node -i -e "$(< main.ts)" -T </dev/null
Hello, world!
> 
real    0m0.673s
user    0m0.362s
sys     0m0.066s

Might be worth reproducing on bare metal and reporting upstream. It doesn't seem reasonable for this to take so long.