node/test/es-module/test-esm-wasm.mjs

// Flags: --experimental-wasm-modules
import '../common/index.mjs';
import { path } from '../common/fixtures.mjs';
import { add, addImported } from '../fixtures/es-modules/simple.wasm';
import { state } from '../fixtures/es-modules/wasm-dep.mjs';
import { strictEqual, ok } from 'assert';
import { spawn } from 'child_process';

strictEqual(state, 'WASM Start Executed');

strictEqual(add(10, 20), 30);

strictEqual(addImported(0), 42);

strictEqual(state, 'WASM JS Function Executed');

strictEqual(addImported(1), 43);

// Test warning message
const child = spawn(process.execPath, [
  '--experimental-wasm-modules',
  path('/es-modules/wasm-modules.mjs'),
]);

let stderr = '';
child.stderr.setEncoding('utf8');
child.stderr.on('data', (data) => {
  stderr += data;
});
child.on('close', (code, signal) => {
  strictEqual(code, 0);
  strictEqual(signal, null);
  ok(stderr.toString().includes(
    'ExperimentalWarning: Importing WebAssembly modules is ' +
    'an experimental feature. This feature could change at any time'
  ));
});