babel-core npm install extremely slow (T7563)

[babel-bot]

Issue originally made by @jhicken

Bug information

• Babel version: 6.10.4
• Node version: 6.3.0
• npm version: 3.10.5

Description

Using slow-deps package you can see that using babel-core takes almost 3 min to install. That seems like a pretty long space of time. I don't know if its due to compilation or http requests. but it seems ungood.

output from my app

Analyzing 90 dependencies...

[====================] 100% 0.0s

| Dependency | Time | Size | # Deps |

| babel-core | 2m 55.9s | 5.9 MB | 53 |
| @kadira/storybook | 1m 5.2s | 43 MB | 357 |
| gulp-imagemin | 1m 0.7s | 9.5 MB | 299 |
| reactcards | 57.1s | 37 MB | 381 |

[hzoo]

slow-deps uses uncached time and most babel dependencies are internal babel-* packages.

I think the best we can do atm the moment is remove babel-runtime when it's not needed, and maybe check if there's circular deps. Not sure we want to do bundleDeps @nolanlawson

[nolanlawson]

I haven't tried bundleDeps myself, but you might ping Dan Abramov since he used it for create-react-app and got some decent perf wins: facebook/create-react-app#41 (comment)

TBH it might not buy you much though. Based on the output above, babel-core has a relatively small size and small number of deps (compared to @kadira/storybook and gulp-imagemin anyway) and yet still takes longer to install. Maybe it's a native dep with a heavy postinstall or something? Would also be worth knowing the architecture, since e.g. fsevents acts differently on macOS vs others.

Also yeah slow-deps measures uncached times and doesn't count de-duping, so it's a rough measure at best.

[hzoo]

babel-cli might be different since it has even more stuff (--watch support). npm/npm#9920 would be useful to check so we can figure out what is the issue. It's actually funny that babel is the example there. I know core-js, source-map can be big

[hzoo]

With nolan's suggestion I ran: https://gist.github.com/hzoo/61a55fbe087f8cda98b8788a4b63dcc4.

Also reading the OP again, it has nothing to do with compilation because babel doesn't compile on install

[hzoo]

Closing this as it would be an ongoing issue - I've already tried looking at deps for a long time now (without much luck) and #5118. Hopefully that is a quick win because otherwise it hasn't been a fruitful use of time