oxc/crates/oxc_codegen/examples/sourcemap.rs

#![allow(clippy::print_stdout)]
use std::{env, path::Path};

use base64::{prelude::BASE64_STANDARD, Engine};
use oxc_allocator::Allocator;
use oxc_codegen::{CodeGenerator, CodegenOptions, CodegenReturn};
use oxc_parser::Parser;
use oxc_span::SourceType;

// Instruction:
// 1. create a `test.js`
// 2. run `cargo run -p oxc_codegen --example sourcemap`

fn main() -> std::io::Result<()> {
    let name = env::args().nth(1).unwrap_or_else(|| "test.js".to_string());
    let path = Path::new(&name);
    let source_text = std::fs::read_to_string(path)?;
    let source_type = SourceType::from_path(path).unwrap();
    let allocator = Allocator::default();
    let ret = Parser::new(&allocator, &source_text, source_type).parse();

    if !ret.errors.is_empty() {
        for error in ret.errors {
            let error = error.with_source_code(source_text.clone());
            println!("{error:?}");
        }
        return Ok(());
    }

    let CodegenReturn { code, map } = CodeGenerator::new()
        .with_options(CodegenOptions {
            source_map_path: Some(path.to_path_buf()),
            ..CodegenOptions::default()
        })
        .build(&ret.program);

    if let Some(source_map) = map {
        let result = source_map.to_json_string();
        let hash =
            BASE64_STANDARD.encode(format!("{}\0{}{}\0{}", code.len(), code, result.len(), result));
        println!("https://evanw.github.io/source-map-visualization/#{hash}");
    }

    Ok(())
}