Question: When to use extensions vs more services? #1468
Description
According to my understanding, the following comparison is true of extensions and services used instead of extensions.
| Feature | Extension | Service |
|---|---|---|
| Provides access to inner bindings | ✅ | ✅ |
| Loaded into | every isolate | own isolate |
| CPU overhead | very low | low |
| Memory overhead | O(num_workers), small constant factor | O(1), high constant factor |
| Binding isolation | high | very high |
| Typescript compatibility | okay | minimal |
| Ideal for | convenience, efficiency | separation, composability |
Is this all fair to say? There's not much documentation for extensions or wrapped bindings, and they're not used very often, so I wasn't able to find answers elsewhere.