Runtime

Modules, Instances, Imports, And Exports

The difference between compiled module code and running instance state.

moduleinstanceimportsexportsstable

A `WebAssembly.Module` is compiled code plus declarations. A `WebAssembly.Instance` is a running instantiation paired with imports, memories, tables, globals, and export wrappers.

Modules are stateless and can be cached or shared across workers.
Instances have runtime state.
Imports provide host values required by the module.
Exports expose functions, memories, tables, and globals back to JavaScript.

References

MDN JavaScript interface