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const bytes = wasmTextToBinary(`(module
(import "wasm:js-string" "length" (func (param externref) (result i32)))
(import "m" "mem" (memory 0))
)`);
const mod = new WebAssembly.Module(bytes, { builtins: ["js-string"] });
const mem = new WebAssembly.Memory({ initial: 0 });
new WebAssembly.Instance(mod, { m: { mem } });