Support using ES modules to define scenarios

cli.ts

@@ -2,7 +2,7 @@
 
 import yargs from 'yargs';
 
-yargs
+yargs(process.argv.slice(2))
   .demandCommand(1, 'Use one of the above commands')
   .command(
     'list',
@@ -22,7 +22,7 @@ yargs
         .array('require')
         .option('matrix', { type: 'string' }),
     async argv => {
-      let mod = await import('./list');
+      let mod = await import('./list.js');
       await mod.printList(argv);
     }
   )
@@ -53,7 +53,7 @@ yargs
         })
         .array('require'),
     async argv => {
-      let mod = await import('./output');
+      let mod = await import('./output.js');
       await mod.output(argv);
     }
   )

list.ts

@@ -1,8 +1,13 @@
-import { Scenario, seenScenarios } from '.';
-import { sync as globSync } from 'glob';
+import { Scenario, seenScenarios } from './index.js';
+import glob from 'glob';
 import { resolve } from 'path';
 import { format } from 'util';
 
+import { createRequire } from 'node:module';
+const require = createRequire(import.meta.url);
+
+const { sync: globSync } = glob;
+
 export interface ListParams {
   files: string[];
   require: string[] | undefined;
@@ -12,12 +17,12 @@ export interface ListParams {
 export async function list(params: ListParams): Promise<Scenario[]> {
   if (params.require) {
     for (let r of params.require) {
-      require(require.resolve(r, { paths: [process.cwd()]}));
+      await import(require.resolve(r, { paths: [process.cwd()]}));
     }
   }
   for (let pattern of params.files) {
     for (let file of globSync(pattern)) {
-      require(resolve(file));
+      await import(resolve(file));
     }
   }
   return seenScenarios;

package.json

@@ -7,6 +7,7 @@
     "scenario-tester": "./cli.js"
   },
   "main": "index.js",
+  "type": "module",
   "scripts": {
     "prepare": "tsc",
     "start": "tsc --watch",

test.ts

@@ -1,24 +1,24 @@
 import { Project } from 'fixturify-project';
-import { Scenarios } from './index';
+import { Scenarios } from './index.js';
 import type { PreparedApp } from './index';
-import Qunit = require('qunit');
-import child_process = require('child_process');
+import Qunit from 'qunit';
+import child_process from 'child_process';
 
 function hello1(project: Project) {
   project.linkDependency('hello', {
-    baseDir: __dirname + '/fixtures',
+    baseDir: './fixtures',
     resolveName: 'hello1',
   });
 }
 
 function hello2(project: Project) {
   project.linkDependency('hello', {
-    baseDir: __dirname + '/fixtures',
+    baseDir: './fixtures',
     resolveName: 'hello',
   });
 }
 
-const scenarios = Scenarios.fromDir(__dirname + '/fixtures/app').expand({
+const scenarios = Scenarios.fromDir('./fixtures/app').expand({
   hello1,
   hello2,
 });

tsconfig.json

@@ -1,7 +1,8 @@
 {
   "compilerOptions": {
-    "target": "es2019",
-    "module": "commonjs",
+    "target": "ES2020",
+    "module": "ES2020",
+    "moduleResolution": "node",
     "declaration": true,
     "esModuleInterop": true,
     "noUnusedLocals": true,