[Question] Export multiple components about cargo-component

[peterhuene]

Hi @Gordon-F. Thanks for the question!

Unfortunately there is no way to define multiple components in a single cargo-component project currently.

cargo-component is designed to only produce a single WebAssembly component; in this case, a single component wasm file defining a single nested WebAssembly module implementing the component.

However, it is possible do define multiple nested components in a WebAssembly component. In theory, a separate tool could be implemented to take multiple WebAssembly components and bundle them together into a single component that exports the inner components. Even so, there would be the requirement of having multiple cargo-component projects.

It is also possible to statically share code between multiple Rust components using normal crate dependencies, but each component will get their own copy of the code.

Could you explain more about the desire to define multiple components in a project? Is it simply to bundle them together or do you envision the components to be able to share a single copy of code?

[Gordon-F]

@peterhuene thank you for the explanation!

Could you explain more about the desire to define multiple components in a project? Is it simply to bundle them together or do you envision the components to be able to share a single copy of code?

Currently, I'm trying to prototype a scripting system for a game engine based on WASM. And I want to use Rust as one of the scripting languages.

For example, a scenario with existing game engines like Unity/Godot/Defold/etc.:

1. Create an entity
2. Attach script (Lua, C#, etc.)
3. Write some code
4. Hit the run button and test game

If we try to re-implement this with Rust as a scripting language, we should create a new crate for every new script. Unfortunately, this is not very convenient. I thought that cargo-component may help here.