crate directory is missing a `Cargo.toml` file; is `-features` the wrong directory

[allenlu2008]

run wasm-pack build --release -- -features js
output :
Error: crate directory is missing a Cargo.toml file; is -features the wrong directory?
Caused by: crate directory is missing a Cargo.toml file; is -features the wrong directory?

[allenlu2008]

run wasm-pack build --release target web
success