Workers resolves modules by URL, not by path
Module specifier resolution changed from filesystem-style paths to URL-based resolution.
Words by Mahdi Rajaee
The change
Previously
Specifiers resolved as flat filesystem paths, so every dependency had to land in one bundle.
With this change
workerd resolves URL specifiers, including query strings and fragments, and compiles lazily.
What it means
Teams can use different specifier query strings to create separate module instances with independent state.
My take
Module identity became a URL problem, which is the bundler's problem moving into the runtime.