vercel dev not working -- ENOENT: no such file or directory, open '/home/user/projects/projectname/target/release/index'

[giuseppe-g-gelardi]

everything works if i deploy to prod however running locally does not work. it is not an issue with the index file name as ive tried it with "handler" and other names; i made sure to update the bin in the cargo.toml as well and it resulted in the same issue.

vercel.json:

{
  "functions": {
    "api/**/*.rs": {
      "runtime": "vercel-rust@4.0.8"
    }
  }
}

cargo.toml:

[package]
name = "projectname"
version = "0.1.0"
edition = "2021"

[dependencies]
tokio = { version = "1", features = ["macros"] }
serde_json = { version = "1.0.106", features = ["raw_value"] }
vercel_runtime = "1.1.0"
url = "2.4.1"

[lib]
path = "src/lib.rs"

# [[bin]] # `cargo run --bin main` to run the main.rs file
# name = "main"
# path = "src/main.rs"

[[bin]]
name = "index"
path = "api/index.rs"

[[bin]] 
name = "hello"
path = "api/hello/handler.rs"

this is what logs in the terminal when i hit the endpoint:

> Building vercel-rust@4.0.8:api/index.rs
(node:306471) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
[Error: ENOENT: no such file or directory, open '/home/user/projects/projectname/target/release/index'] {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/home/user/projects/projectname/target/release/index'
}

[stehefan]

Not sure if there was a conflict between the cargo run-command and vercel dev, but after removing the target-folder from the project repository, the compilation and runtime went without problems for me after having the same issue first. Maybe it was as easy for you as that as well.