Can't compile due to bug in dependency `deno_ast=0.49.0`

[ozaner]

Describe the bug

rustyscript v0.12.3 fails to build, giving a serde::__private import error. The issue is caused by a breaking change in serde that found itself upstream to deno_ast v0.49.0 which is the version pinned by rustyscript in its Cargo.toml.

Error:

error[E0432]: unresolved import `serde::__private`
 --> swc_config-3.0.0\src\types\bool_or_data.rs:128:20
  |
128 |         use serde::__private::de;
    |                    ^^^^^^^^^ could not find `__private` in `serde`

To Reproduce

Tested on both Windows and Ubuntu (via WSL2). Steps to reproduce the behavior:

1. Create a new Rust project: cargo new test-rustyscript && cd test-rustyscript
2. Add rustyscript: cargo add rustyscript --features fs_import,url_import
3. Set environment variable to avoid NASM requirement (due to deno using the aws-lc-rs crate, see here):
   • Windows (PowerShell): $env:AWS_LC_SYS_NO_ASM = "1"
   • Linux/macOS (Bash): export AWS_LC_SYS_NO_ASM=1
4. Build: cargo build
5. See error (build fails with serde::__private error)

Expected behavior

The project should build successfully without errors.

Root Cause
rustyscript's Cargo.toml (line 176) pins deno_ast = "=0.49.0", which depends on the broken swc_config v3.0.0.

rustyscript v0.12.3
  └─ deno_ast v0.49.0         ← Pinned to exact version
      └─ swc_config v3.0.0    ← Has serde::__private bug

The Fix

Change this line in rustyscript's Cargo.toml (line 176):

- deno_ast = { version = "=0.49.0", features = ["transpiling", "cjs"] }
+ deno_ast = { version = "0.50", features = ["transpiling", "cjs"] }

I tested it, and it compiles fine once deno_ast's version is bumped.

Why this works:

• deno_ast v0.50+ uses swc_config v3.1.2 (which has the serde fix)
• deno_ast v0.49.0 uses swc_config v3.0.0 (broken)

[utyfua]

Dublicate of #399
I'm waiting for the new deno version with deno_core v0.363.0 or higher before submitting a PR.

[eirikb]

FWIW, to build with web feature, also add deno_media_type = "=0.2.1" and use serde = "=1.0.215" instead of 1.0.219...