refactor(spawner): Converts RESM to NESM

packages/spawner/README.md

@@ -12,7 +12,8 @@ source retrieval, issuers, invitations, or seats). These callers now do
 something like:
 
 ```js
-  const bundle = await bundleSource(pathResolve(__dirname, './src/wallet.js'));
+  const bundlePath = new URL('src/wallet.js', import.meta.url).pathname;
+  const bundle = await bundleSource(bundlePath);
   const walletInstall = E(spawner).install(bundle);
   const walletVat = await E(walletInstall).spawn(args);
 ```

packages/spawner/package.json

@@ -2,17 +2,16 @@
   "name": "@agoric/spawner",
   "version": "0.4.23",
   "description": "Wrapper for JavaScript map",
-  "parsers": {
-    "js": "mjs"
-  },
-  "main": "src/contractHost.js",
+  "type": "module",
+  "main": "./src/contractHost.js",
   "engines": {
     "node": ">=11.0"
   },
   "scripts": {
     "build": "yarn build-bundle-spawn",
-    "build-bundle-spawn": "node -r esm scripts/build-bundle-spawn.js",
+    "build-bundle-spawn": "node scripts/build-bundle-spawn.js",
     "test": "ava",
+    "test:c8": "c8 $C8_OPTIONS ava --config=ava-nesm.config.js",
     "test:xs": "exit 0",
     "lint-check": "yarn lint",
     "lint-fix": "eslint --fix '**/*.js'",
@@ -43,7 +42,7 @@
     "@agoric/install-ses": "^0.5.21",
     "@agoric/swingset-vat": "^0.19.0",
     "ava": "^3.12.1",
-    "esm": "agoric-labs/esm#Agoric-built"
+    "c8": "^7.7.2"
   },
   "files": [
     "src/",
@@ -68,9 +67,6 @@
     "files": [
       "test/**/test-*.js"
     ],
-    "require": [
-      "esm"
-    ],
     "timeout": "2m"
   }
 }

packages/spawner/scripts/build-bundle-spawn.js

@@ -1,21 +1,23 @@
-/* global __dirname */
-
 // eslint-disable-next-line import/no-extraneous-dependencies
 import 'ses';
 import fs from 'fs';
+import path from 'path';
 import process from 'process';
 import bundleSource from '@agoric/bundle-source';
 
+const filename = new URL(import.meta.url).pathname;
+const dirname = path.dirname(filename);
+
 async function writeSourceBundle(contractFilename, outputPath) {
   await bundleSource(contractFilename).then(bundle => {
-    fs.mkdirSync(`${__dirname}/../bundles`, { recursive: true });
+    fs.mkdirSync(`${dirname}/../bundles`, { recursive: true });
     fs.writeFileSync(outputPath, `export default ${JSON.stringify(bundle)};`);
   });
 }
 
 async function main() {
-  const contractFilename = `${__dirname}/../src/vat-spawned.js`;
-  const outputPath = `${__dirname}/../bundles/bundle-spawn.js`;
+  const contractFilename = `${dirname}/../src/vat-spawned.js`;
+  const outputPath = `${dirname}/../bundles/bundle-spawn.js`;
   await writeSourceBundle(contractFilename, outputPath);
 }
 

packages/spawner/test/swingsetTests/contractHost/test-contractHost.js

@@ -1,4 +1,3 @@
-/* global __dirname */
 // eslint-disable-next-line import/order
 import { test } from '@agoric/swingset-vat/tools/prepare-test-env-ava.js';
 // eslint-disable-next-line import/order
@@ -10,15 +9,18 @@ import {
   loadBasedir,
 } from '@agoric/swingset-vat';
 
+const filename = new URL(import.meta.url).pathname;
+const dirname = path.dirname(filename);
+
 test.before(async t => {
   const kernelBundles = await buildKernelBundles();
-  const trivialFn = path.resolve(__dirname, 'trivial.js');
+  const trivialFn = path.resolve(dirname, 'trivial.js');
   const trivialBundle = await bundleSource(trivialFn);
   t.context.data = { kernelBundles, trivialBundle };
 });
 
 async function main(t, mode) {
-  const config = await loadBasedir(__dirname);
+  const config = await loadBasedir(dirname);
   config.defaultManagerType = 'xs-worker';
   const { kernelBundles, trivialBundle } = t.context.data;
   const argv = [mode, trivialBundle];

packages/spawner/test/swingsetTests/contractHost/vat-spawner.js

@@ -1,6 +1,6 @@
 // Copyright (C) 2018 Agoric, under Apache License 2.0
 import { Far } from '@agoric/marshal';
-import { makeSpawner } from '../../../src/contractHost';
+import { makeSpawner } from '../../../src/contractHost.js';
 
 function buildRootObject() {
   return Far('root', {