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lib.rs
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lib.rs
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use anyhow::{Context, Error};
use next_swc::{custom_before_pass, TransformOptions};
use once_cell::sync::Lazy;
use std::sync::Arc;
use swc::{config::JsMinifyOptions, config::ParseOptions, try_with_handler, Compiler};
use swc_common::{comments::Comments, errors::ColorConfig, FileName, FilePathMapping, SourceMap};
use swc_ecmascript::transforms::pass::noop;
use wasm_bindgen::prelude::*;
fn convert_err(err: Error) -> JsValue {
format!("{:?}", err).into()
}
#[wasm_bindgen(js_name = "minifySync")]
pub fn minify_sync(s: &str, opts: JsValue) -> Result<JsValue, JsValue> {
console_error_panic_hook::set_once();
let c = compiler();
try_with_handler(
c.cm.clone(),
swc::HandlerOpts {
color: ColorConfig::Never,
skip_filename: false,
},
|handler| {
let opts: JsMinifyOptions = opts.into_serde().context("failed to parse options")?;
let fm = c.cm.new_source_file(FileName::Anon, s.into());
let program = c
.minify(fm, handler, &opts)
.context("failed to minify file")?;
JsValue::from_serde(&program).context("failed to serialize json")
},
)
.map_err(convert_err)
}
#[wasm_bindgen(js_name = "transformSync")]
pub fn transform_sync(s: &str, opts: JsValue) -> Result<JsValue, JsValue> {
console_error_panic_hook::set_once();
let c = compiler();
try_with_handler(
c.cm.clone(),
swc::HandlerOpts {
color: ColorConfig::Never,
skip_filename: false,
},
|handler| {
let opts: TransformOptions = opts.into_serde().context("failed to parse options")?;
let fm = c.cm.new_source_file(
if opts.swc.filename.is_empty() {
FileName::Anon
} else {
FileName::Real(opts.swc.filename.clone().into())
},
s.into(),
);
let cm = c.cm.clone();
let file = fm.clone();
let out = c
.process_js_with_custom_pass(
fm,
None,
handler,
&opts.swc,
|_, comments| {
custom_before_pass(cm, file, &opts, comments.clone(), Default::default())
},
|_, _| noop(),
)
.context("failed to process js file")?;
JsValue::from_serde(&out).context("failed to serialize json")
},
)
.map_err(convert_err)
}
#[wasm_bindgen(js_name = "parseSync")]
pub fn parse_sync(s: &str, opts: JsValue) -> Result<JsValue, JsValue> {
console_error_panic_hook::set_once();
let c = swc::Compiler::new(Arc::new(SourceMap::new(FilePathMapping::empty())));
try_with_handler(
c.cm.clone(),
swc::HandlerOpts {
..Default::default()
},
|handler| {
c.run(|| {
let opts: ParseOptions = opts.into_serde().context("failed to parse options")?;
let fm = c.cm.new_source_file(FileName::Anon, s.into());
let cmts = c.comments().clone();
let comments = if opts.comments {
Some(&cmts as &dyn Comments)
} else {
None
};
let program = c
.parse_js(
fm,
handler,
opts.target,
opts.syntax,
opts.is_module,
comments,
)
.context("failed to parse code")?;
let s = serde_json::to_string(&program).unwrap();
Ok(JsValue::from_str(&s))
})
},
)
.map_err(convert_err)
}
/// Get global sourcemap
fn compiler() -> Arc<Compiler> {
static C: Lazy<Arc<Compiler>> = Lazy::new(|| {
let cm = Arc::new(SourceMap::new(FilePathMapping::empty()));
Arc::new(Compiler::new(cm))
});
C.clone()
}