vitest.config.mts

import { createRequire } from 'module';
import { dirname, resolve } from 'path';
import { versionInfo } from 'graphql';
import { defineConfig } from 'vitest/config';

export const sharedConfig = defineConfig({
  resolve: {
    alias: {
      graphql: (function resolveGraphQL() {
        if (versionInfo.major < 17) {
          return 'graphql/index.js';
        }
        // Use an absolute path to graphql/index.mjs so ALL imports (Vite-processed
        // and Node.js-native) resolve to the same ESM module in Node.js's module cache,
        // preventing graphql@17's devInstanceOf from detecting false cross-realm usage.
        const _require = createRequire(import.meta.url);
        // require.resolve('graphql') returns index.mjs in Node.js v24 (via module-sync condition)
        const graphqlIndexMjs = resolve(dirname(_require.resolve('graphql')), 'index.mjs');
        return graphqlIndexMjs;
      })(),
    },
    tsconfigPaths: true,
  },
  test: {
    globals: true,
  },
});

export default defineConfig({
  test: {
    projects: ['packages/**/vitest.config.mts', 'examples/**/vitest.config.mts'],
    watch: false,
  },
});