How to use swc in rust to compile a js/ts file ?

[vishnuvardhanachari]

Hi Team, I'm trying to compile js/ts inside the rust code. It would be great if someone can guide me or point me in the right direction. Following code is throwing error

use std::{path::Path, sync::Arc};
use swc::{self, config::Options};
use swc_common::{
    GLOBALS,
    errors::{ColorConfig, Handler},
    SourceMap,
};


fn main() {
    let cm = Arc::<SourceMap>::default();
    let handler = Handler::with_tty_emitter(
        ColorConfig::Auto,
        true,
        false,
        Some(cm.clone(),
    ));
    let compiler = swc::Compiler::new(cm.clone());

    let fm = cm
        // filepath that actually exists relative to the binary
        .load_file(Path::new("./script/some.js"))
        .expect("failed to load file");
    
    let result:Result<TransformOutput, Error> = compiler.process_js_file(
        fm,
        &handler,
        &Options {
            ..Default::default()
        }
    )
    .expect("failed to process file");

}

Error:
thread 'main' panicked at '`swc_common::GLOBALS` is required for this operation', /usr/local/cargo/git/checkouts/swc-594f88c93b4170b2/bed73c1/crates/swc/src/lib.rs:255:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[JSerFeng]

You need to call compiler. process_js_file inside a thread local closure, for example

GLOBALS.set(&Default::default(), |_| {
  ...
  compiler. process_js_file( ... )
})

GLOBALS is from swc_common, its used to store marks