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Unlike other tools, wasm-pack forces you to use a lib, not a bin crate, and the entry-point to your program is annotated with a #[wasm_bindgen(start)] attribute.

Your Cargo.toml also should specify that your crate's type is a "cdylib".

[package]name = "yew-app"version = "0.1.0"authors = ["Yew App Developer <>"]edition = "2018"
[lib]# You should include "rlib" (the default crate type) otherwise your crate can't be used as a Rust library# which, among other things, breaks unit testingcrate-type = ["rlib", "cdylib"]
[dependencies]yew = "0.17"wasm-bindgen = "0.2"

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