⬆️ deps: Upgrade ava to v4.0.0-rc.1.

package.json

@@ -68,15 +68,20 @@
     "prepare": "npm run build",
     "prepublishOnly": "pinst --disable",
     "release": "np --message ':hatching_chick: release: Bumping to v%s.'",
-    "test": "ava"
+    "test": "npm run test:src",
+    "test-cmd": "NODE_LOADER_CONFIG=test/loader/config.js ava",
+    "test:cjs": "IMPORT_MAP_PATH=test/import-maps/dist/index.json npm run test-cmd",
+    "test:dist": "npm run test:modern && npm run test:module && npm run test:cjs",
+    "test:modern": "IMPORT_MAP_PATH=test/import-maps/dist/index.modern.json npm run test-cmd",
+    "test:module": "IMPORT_MAP_PATH=test/import-maps/dist/index.module.json npm run test-cmd",
+    "test:src": "IMPORT_MAP_PATH=test/import-maps/src/index.json npm run test-cmd"
   },
   "dependencies": {
     "@combinatorics/permutation": "^4.0.0"
   },
   "devDependencies": {
     "@babel/core": "7.16.5",
     "@babel/preset-env": "7.16.5",
-    "@babel/register": "7.16.5",
     "@commitlint/cli": "15.0.0",
     "@iterable-iterator/list": "1.0.1",
     "@iterable-iterator/map": "1.0.1",
@@ -86,10 +91,13 @@
     "@iterable-iterator/sorted": "1.0.0",
     "@iterable-iterator/zip": "1.0.1",
     "@js-library/commitlint-config": "0.0.4",
+    "@node-loader/babel": "2.0.0",
+    "@node-loader/core": "2.0.0",
+    "@node-loader/import-maps": "1.0.3",
     "@randomized/random": "4.0.0",
     "@total-order/lex": "1.0.0",
     "@total-order/primitive": "1.0.1",
-    "ava": "3.15.0",
+    "ava": "4.0.0-rc.1",
     "babel-plugin-transform-remove-console": "6.9.4",
     "babel-plugin-unassert": "3.2.0",
     "babel-preset-power-assert": "3.0.0",
@@ -113,21 +121,15 @@
       "test/src/**/*"
     ],
     "require": [
-      "regenerator-runtime/runtime",
-      "@babel/register"
+      "regenerator-runtime/runtime"
+    ],
+    "nodeArguments": [
+      "--experimental-loader=@node-loader/core"
     ],
     "timeout": "1m"
   },
   "babel": {
     "sourceMaps": true,
-    "presets": [
-      [
-        "@babel/preset-env",
-        {
-          "targets": "current node"
-        }
-      ]
-    ],
     "plugins": [
       [
         "transform-remove-console",

test/import-maps/dist/index.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./dist/index.cjs"
+  }
+}

test/import-maps/dist/index.modern.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./dist/index.modern.js"
+  }
+}

test/import-maps/dist/index.module.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./dist/index.module.js"
+  }
+}

test/import-maps/src/index.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./src/index.js"
+  }
+}

test/loader/babel.js

@@ -0,0 +1,132 @@
+/**
+ * Based on source of @node-loader/babel
+ *
+ * Source: https://github.com/node-loader/node-loader-babel
+ *
+ * with the following license:
+ *
+ * MIT License
+ *
+ * Copyright (c) 2020 node-loaders
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import process from 'process';
+import path from 'path';
+import {fileURLToPath} from 'url';
+import {loadOptionsAsync, transformAsync} from '@babel/core';
+
+const BABEL_FORMATS_TRANSFORMED = new Set(['module']);
+
+const BABEL_CONFIG_FILES = new Set([
+	'.babelrc.js',
+	'.babelrc.mjs',
+	'babel.config.js',
+	'babel.config.mjs',
+	'.babelrc',
+	'.babelrc.cjs',
+	'babel.config.cjs',
+]);
+
+const anyURLToPathOrUndefined = (url) => {
+	try {
+		return fileURLToPath(url);
+	} catch (error) {
+		if (error instanceof TypeError && error.code === 'ERR_INVALID_URL_SCHEME') {
+			return undefined;
+		}
+
+		throw error;
+	}
+};
+
+const isBabelConfigFile = (filename) => {
+	const basename = path.basename(filename);
+	return BABEL_CONFIG_FILES.has(basename);
+};
+
+const getSourceType = (format) => {
+	switch (format) {
+		case 'module':
+			return 'module';
+		case 'commonjs':
+			return 'script';
+		default:
+			return 'unambiguous';
+	}
+};
+
+const prepare = async (url, context, defaultLoad) => {
+	const original = await defaultLoad(url, context, defaultLoad);
+
+	const noop = () => ({
+		transform: false,
+		original,
+	});
+
+	if (
+		/node_modules/.test(url) ||
+		/node:/.test(url) ||
+		!BABEL_FORMATS_TRANSFORMED.has(original.format)
+	) {
+		return noop();
+	}
+
+	const filename = anyURLToPathOrUndefined(url);
+
+	// Babel config files can themselves be ES modules,
+	// but transforming those could require more than one pass.
+	if (isBabelConfigFile(filename)) return noop();
+
+	return {
+		transform: true,
+		original,
+		options: {
+			filename,
+		},
+	};
+};
+
+const transformed = async ({format, source}, {filename}) => {
+	const options = await loadOptionsAsync({
+		sourceType: getSourceType(format),
+		root: process.cwd(),
+		rootMode: 'root',
+		filename,
+		configFile: true,
+	});
+
+	const result = await transformAsync(source, options);
+
+	return {
+		source: result.code,
+		// TODO: look at babel config to see whether it will output ESM/CJS or other formats
+		format,
+	};
+};
+
+export const load = async (url, context, defaultLoad) => {
+	const {transform, original, options} = await prepare(
+		url,
+		context,
+		defaultLoad,
+	);
+	return transform ? transformed(original, options) : original;
+};

test/loader/config.js

@@ -0,0 +1,9 @@
+import * as importMapLoader from '@node-loader/import-maps';
+// Import * as babelLoader from "@node-loader/babel";
+import * as babelLoader from './babel.js';
+
+const config = {
+	loaders: [importMapLoader, babelLoader],
+};
+
+export default config;

test/src/api/sort.js

@@ -1,4 +1,4 @@
-import {AssertionError} from 'assert';
+import assert from 'assert';
 import test from 'ava';
 import {list} from '@iterable-iterator/list';
 import {all} from '@iterable-iterator/reduce';
@@ -24,7 +24,7 @@ limbs.title = (title, k, M, data) =>
 	title || `sort(${k}, ${M}, ${JSON.stringify(data)})`;
 
 const throws = (t, k, M, data) => {
-	t.throws(() => sort(k, M, data.slice()), {instanceOf: AssertionError});
+	t.throws(() => sort(k, M, data.slice()), {instanceOf: assert.AssertionError});
 };
 
 throws.title = (title, k, M, data) =>