Missing package.json file

[lencx]

🐛 Bug description

1. run wasm-pack build
2. pkg directory missing package.json file

🤔 Expected Behavior

There is a package.json file in the pkg directory

👟 Steps to reproduce

example: https://github.com/lencx/learn-wasm

❯ wasm-pack build
[INFO]: 🎯  Checking for the Wasm target...
[INFO]: 🌀  Compiling to Wasm...
    Finished release [optimized] target(s) in 0.01s
⚠️   [WARN]: origin crate has no README
[INFO]: ⬇️  Installing wasm-bindgen...
Error: no prebuilt wasm-opt binaries are available for this platform: Unrecognized target!
To disable `wasm-opt`, add `wasm-opt = false` to your package metadata in your `Cargo.toml`.

# wasm-pack build

[pkg]
|- .gitignore
|- chasm_bg.js
|- chasm_bg.wasm
|- chasm_bg.wasm.d.ts
|- chasm.d.ts
|- chasm.js
|- package.json # missing

🌍 Your environment

os: macOS M1(arm)
wasm-pack version: 0.9.1
rustc version: rustc 1.49.0 (e1884a8e3 2020-12-29)

[lencx]

Solution: disable wasm-opt in Cargo.toml (see: #886 (comment))

[package.metadata.wasm-pack.profile.release]
wasm-opt = false