poc ts-loader for node 23+ correct importing

ts-loader.js

// Keep that file in the project root and call the index with `node --loader ./ts-loader.js ./src/index.ts`
import { stat } from "fs/promises";
import { join, dirname, isAbsolute } from "path";
import { fileURLToPath, pathToFileURL } from "url";

export async function resolve(specifier, context, nextResolve) {
    if (
        !specifier.startsWith("file:") &&
        !specifier.startsWith("./") &&
        !specifier.startsWith("../") &&
        !specifier.startsWith("/")
    ) {
        return nextResolve(specifier, context);
    }

    let baseDir = process.cwd();
    if (context.parentURL && context.parentURL.startsWith("file:")) {
        baseDir = dirname(fileURLToPath(context.parentURL));
    }

    let resolved;

    try {
        let tsFile;
        if (specifier.startsWith("file:")) {
            tsFile = fileURLToPath(specifier);
        } else if (isAbsolute(specifier)) {
            tsFile = specifier;
        } else {
            tsFile = join(baseDir, specifier);
        }
        if (!tsFile.endsWith(".ts")) {
            tsFile += ".ts";
        }
        await stat(tsFile);
        resolved = tsFile;
    } catch {
        try {
            let dir;
            if (specifier.startsWith("file:")) {
                dir = fileURLToPath(specifier);
            } else if (isAbsolute(specifier)) {
                dir = specifier;
            } else {
                dir = join(baseDir, specifier);
            }
            const indexTs = join(dir, "index.ts");
            await stat(indexTs);
            resolved = indexTs;
        } catch {
            return nextResolve(specifier, context);
        }
    }

    return {
        url: pathToFileURL(resolved).href,
        shortCircuit: true,
    };
}

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