This library does not work with ESM mode

[eigood]

Import in node when using *.mjs doesn't work, as import doesn't use require.extensions.

[danhaggard]

This is how I solved the problem (requires node >= 17):

Created an esm-loader.mjs file in my root:

import { parse } from 'graphql';
import { promises as fs } from 'fs';

const VALID_EXTENSIONS = ['.graphql', '.graphqls', '.gql', '.gqls'];

export async function load(url, context, defaultLoad) {
  const { pathname } = new URL(url);
  const extension = pathname.slice(((pathname.lastIndexOf('.') - 1) >>> 0) + 2);
  if (VALID_EXTENSIONS.includes(`.${extension}`)) {
    const content = await fs.readFile(pathname, 'utf-8');
    const parsed = parse(content);
    const transformedSource = `export default ${JSON.stringify(parsed)};`;
    return {
      format: 'module',
      source: transformedSource,
      shortCircuit: true,
    };
  }

  if (defaultLoad) {
    return defaultLoad(url, context, defaultLoad);
  } else {
    throw new Error(`Unsupported file extension: ${extension}`);
  }
}

Then you can do on the command line:

node  --loader ./esm-loader.mjs src/index.js

If you're using typescript and ts-node:

TS_NODE_PROJECT=tsconfig.json node --loader ts-node/esm --loader ./esm-loader.mjs src/index.ts