tsconfig-paths-esm-loader/loader.mjs

A custom loader for ESM projects that adds support for tsconfig paths

import { resolve as resolveTs } from 'ts-node/esm.mjs';
import * as tsConfigPaths from 'tsconfig-paths';
import { pathToFileURL } from 'url';
const tsConfig = tsConfigPaths.loadConfig();
if (tsConfig.resultType === 'failed') {
    throw new Error(tsConfig.message);
}
const { paths, absoluteBaseUrl } = tsConfig;
const matchPath = tsConfigPaths.createMatchPath(absoluteBaseUrl, paths);
const supportedExtensions = ['js', 'mjs'];
const supportedTSExtensions = ['ts', 'mts'];
const supportedExtensionsRegex = new RegExp(`(${supportedExtensions.map((ext) => `\\.${ext}`).join('|')})$`, 'g');
export const resolve = function resolve(
// @ts-ignore
specifier, 
// @ts-ignore
ctx, 
// @ts-ignore
defaultResolve) {
    const supportedExtensionMatch = specifier.match(supportedExtensionsRegex);
    if (supportedExtensionMatch) {
        const supportedExtension = supportedExtensionMatch[0];
        const trimmed = specifier.substring(0, specifier.lastIndexOf(supportedExtension));
        const match = matchPath(trimmed, undefined, undefined, supportedTSExtensions.map((ext) => `.${ext}`));
        if (match) {
            return resolveTs(pathToFileURL(`${match}${supportedExtension}`).href, ctx, defaultResolve);
        }
    }
    return resolveTs(specifier, ctx, defaultResolve);
};
export { load, transformSource } from 'ts-node/esm';