Getting heap allocation error for a large entry size about array-keyed-map HOT 1 OPEN

Allocation failed - JavaScript heap out of memory

Hard to say without seeing your code whether this library is responsible for the memory use amplification. Maps seem to be quite memory-hungry though, and this library uses a lot of them, especially if the key paths have lots of long and unique paths, because a new Map is created for every unique path element. That's what you might be seeing here.

It may be possible to improve memory usage by internally splitting path elements onto separate Maps only where they actually fork, and keeping paths in array form wherever they don't. It wouldn't require an API change, but it would complicate the implementation. I may get around to this eventually; I'll keep this issue open as a reminder.

For now, a workaround may be to increase the heap limit, e.g. with node --max-old-space-size=8192 script.js to set it to 8GiB. The default limit depends on Node.js version and processor bitness. On 64-bit Node 16.x it's 4GiB.

from array-keyed-map.