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How big is your Typescript project? Because when I read the first paragraph of this I cringed and knew where they were going. We have a medium sized Typescrip

How big is your Typescript project? Because when I read the first paragraph of this I cringed and knew where they were going. We have a medium sized Typescript app (~100k lines), and it takes 7-10 seconds to transpile to JS. Whenever a change is made, that is 7-10 seconds the watch command is running and I'm not testing my changes in the webapp. In fact, a slow running grunt watch is why I'm on HN right now in the first place.

maineldc 11y ago
The article's code base is also ~100K lines (of clojure) and the type checker runs for 2 mins, so it feels safe to say that Typescript's checking is an order of magnitude faster, right?
- softawre 11y ago
  I guess so. The who who recommended Webpack, I can't reply to you for some reason, though I will try it.
rattray 11y ago
Have you tried using Webpack instead of grunt? I haven't tried it with TypeScript but it watches incrementally and might be a lot faster.
pjmlp 11y ago
> Whenever a change is made, that is 7-10 seconds the watch command is running and I'm not testing my changes in the webapp. Compared with C and C++ build times which are measured in minutes or even hours, 10s is nothing.
- copperx 11y ago
  I wasn't aware that C and C++ compilers were dog-slow. Is that because of the complexity of the language in the case of C++ compilers?
  - chubot 11y ago
    A lot of the bottleneck is the header structure: the size of the translation units (.c files with headers expanded transitively) is often quadratic with respect to overall codebase size. If you fix that, then linking can take a long time too. (Not sure on the details, but it's a "global" algorithm to fix up all the pointer offsets) Incremental builds will be slow if you structure your code in such a way that you often have to touch a header file, and that header file requires recompiling all translation units. In short, you have to be super careful about structuring your code in C/C++ if you want fast build times, and approximately zero of the industrial codebases I've seen do this. (Well there was one, but it was all written by a single person, which is not surprising.)
- JoeAltmaier 11y ago
  Huh? My 100,000 lines of code takes seconds.
  - pjmlp 11y ago
    Try compiling a real big project, enterprise scale e.g. Linux kernel.
  - Matthias247 11y ago
    That also depends massively on the used libraries and the structure of the code. A 100kloc c file could build superfast. Whereas multiple c++ totalling about 10kloc that include use use lots of Boost stuff can take ages compared to that.
spion 11y ago
Is that watching using `tsc -w` or watch(1) [1] [1]: http://linux.die.net/man/1/watch http://linux.die.net/man/1/watch
fernandezpablo 11y ago
That's a ton, you're probably not using typescript incremental compilation feature but recompiling your whole codebase instead. Even in that case, 7 seconds for compiling a 100k LOC code base is not even close to what I call "slow".
- jerven 11y ago
  Its slower than my java build with 300000 lines in it. More than 0.5 seconds is slow.
carterehsmith 11y ago
"Whenever a change is made, that is 7-10 seconds the watch command is running" Wait, is that 7-10 sec with "tsc --watch"? Or like, the whole shebang for the production build?

maineldc 11y ago

The article's code base is also ~100K lines (of clojure) and the type checker runs for 2 mins, so it feels safe to say that Typescript's checking is an order of magnitude faster, right?

softawre 11y ago
I guess so. The who who recommended Webpack, I can't reply to you for some reason, though I will try it.

rattray 11y ago

Have you tried using Webpack instead of grunt? I haven't tried it with TypeScript but it watches incrementally and might be a lot faster.

pjmlp 11y ago

> Whenever a change is made, that is 7-10 seconds the watch command is running and I'm not testing my changes in the webapp. Compared with C and C++ build times which are measured in minutes or even hours, 10s is nothing.

copperx 11y ago
I wasn't aware that C and C++ compilers were dog-slow. Is that because of the complexity of the language in the case of C++ compilers?
- chubot 11y ago
  A lot of the bottleneck is the header structure: the size of the translation units (.c files with headers expanded transitively) is often quadratic with respect to overall codebase size. If you fix that, then linking can take a long time too. (Not sure on the details, but it's a "global" algorithm to fix up all the pointer offsets) Incremental builds will be slow if you structure your code in such a way that you often have to touch a header file, and that header file requires recompiling all translation units. In short, you have to be super careful about structuring your code in C/C++ if you want fast build times, and approximately zero of the industrial codebases I've seen do this. (Well there was one, but it was all written by a single person, which is not surprising.)
JoeAltmaier 11y ago
Huh? My 100,000 lines of code takes seconds.
- pjmlp 11y ago
  Try compiling a real big project, enterprise scale e.g. Linux kernel.
- Matthias247 11y ago
  That also depends massively on the used libraries and the structure of the code. A 100kloc c file could build superfast. Whereas multiple c++ totalling about 10kloc that include use use lots of Boost stuff can take ages compared to that.

spion 11y ago

Is that watching using `tsc -w` or watch(1) [1] [1]: http://linux.die.net/man/1/watch http://linux.die.net/man/1/watch

fernandezpablo 11y ago

That's a ton, you're probably not using typescript incremental compilation feature but recompiling your whole codebase instead. Even in that case, 7 seconds for compiling a 100k LOC code base is not even close to what I call "slow".

jerven 11y ago
Its slower than my java build with 300000 lines in it. More than 0.5 seconds is slow.

carterehsmith 11y ago

"Whenever a change is made, that is 7-10 seconds the watch command is running" Wait, is that 7-10 sec with "tsc --watch"? Or like, the whole shebang for the production build?