swc/crates/swc_ecma_transforms_react/scripts/patch-options.ts

import * as fs from "fs";
import * as path from "path";

async function* walk(dir: string): AsyncGenerator<string> {
    for await (const d of await fs.promises.opendir(dir)) {
        const entry = path.join(dir, d.name);
        if (d.isDirectory()) yield* walk(entry);
        else if (d.isFile()) yield entry;
    }
}

// Then, use it with a simple async for loop
async function main() {
    // TODO: Generalize path
    for await (const f of walk("src/jsx/fixture")) {
        if (!f.endsWith(".json")) {
            continue;
        }
        const obj = JSON.parse(
            await fs.promises.readFile(f, { encoding: "utf-8" })
        );
        const dir = path.dirname(f);

        if (obj.throws) {
            await fs.promises.writeFile(
                path.join(dir, "output.stderr"),
                obj.throws
            );
        }

        console.log(f);
        if (obj.plugins) {
            if (obj.plugins.includes("transform-react-jsx")) {
                const newObj = {
                    ...obj,
                };
                delete newObj.sourceType;
                delete newObj.plugins;
                await fs.promises.writeFile(f, JSON.stringify(newObj), {
                    encoding: "utf-8",
                });
                continue;
            }

            for (const [plugin, config] of obj.plugins) {
                if (plugin === "transform-react-jsx") {
                    console.log(plugin, config);
                    const newObj = {
                        ...obj,
                        ...config,
                    };
                    delete newObj.sourceType;
                    delete newObj.plugins;
                    await fs.promises.writeFile(f, JSON.stringify(newObj), {
                        encoding: "utf-8",
                    });
                    break;
                }
            }
        }
    }
}

main();