How to pass options to node when using babel-node

Question

Babel CLI docs (https://babeljs.io/docs/usage/cli/):

babel-node [options] [ -e script | script.js ] [arguments]

But when trying to increase allocated memory for Node:

babel-node --max-old-space-size=16384 script.js

argument --max-old-space-size=16384 seems to be ignored

Does sb know if this should work, and if shouldn't - some workaround?

Answer 1

Edit: (Juli 2016) As of version 6.11.4 all variations are supported now. The example posted in the question works now.

---

Babel in version 6.11.3 does not support all variations of v8Flags yet.

Node itself supports passing this flags either with underscore (--max_old_space_size) or dashes (--max-old-space-size).

In contrast babel-node only supports these flags if the are specified with underscores and does not support the format --flag=value.

There is a open pull request, that addresses this issues. Sadly there is no current workaround for specifying v8Flags with values.

Answer 2

I am using Babel 7, and this does in fact work.

babel-node --max-old-space-size=16384 script.js

Easy way to test is to just lower the size to 100KB, and you will run out of memory quickly.