Stream: cargo-component

Topic: error: failed to decode world from module

Wynter (Apr 02 2025 at 12:20):

Compiling verifier v0.1.0 (/home/ubunutu/workspace/verifier)
    Finished dev profile [unoptimized + debuginfo] target(s) in 0.80s
    Creating component target/wasm32-wasip1/debug/verifier.wasm
error: failed to decode world from module

Caused by:
    0: module was not valid
    1: failed to resolve import env::getpid
    2: module requires an import interface named env

Hi, I'm encountering this error when using cargo component build to build my project to a wasm component. Even though this error happened, the wasm file target/wasm32-wasip1/debug/verifier.wasm is generated, but instead of component it is a wasm module. Also, I don't find any reference of env::getpid in my project(maybe some Rust lib uses it). Why is this kind of dependency error happening at build time?
Here is my world.wit:

package test:verifier@0.1.0;
interface verifier-itf {
    variant optional-data {
        value(list<u8>),
        not-provided,
    }
    type report-data = optional-data;
    type init-data-hash = optional-data;
    resource verifier {
        evaluate: func(
            evidence: list<u8>,
            expected-report-data: report-data,
            expected-init-data-hash: init-data-hash
        ) -> string;
    }
}

world verifier-wrd {
    export verifier-itf;
}

Last updated: Dec 06 2025 at 06:05 UTC