Add test for keys and values

package.json

@@ -52,6 +52,7 @@
 		"cheerio": "^1.0.0",
 		"eslint-plugin-jest": "^28.11.0",
 		"get-port": "^7.1.0",
+		"is-identifier": "^1.0.1",
 		"nano-spawn": "^0.2.0",
 		"npm-run-all2": "^8.0.1",
 		"outdent": "^0.8.0",

test.mjs

@@ -1,5 +1,6 @@
 import fs from 'node:fs/promises';
 import test from 'ava';
+import isIdentifier from 'is-identifier';
 import {DATA_DIRECTORY, readGlobals} from './utilities.mjs';
 import globals from './index.js';
 
@@ -102,4 +103,30 @@ test('globals.json', async t => {
 		jsData,
 		globals,
 	);
+
+	for (const [environment, data] of Object.entries(globals)) {
+		t.is(environment.trim(), environment, `Unexpected space around environment key '${environment}'.`);
+
+		for (const [name, value] of Object.entries(data)) {
+			t.is(name.trim(), name, `Unexpected space around object name '${name}' in '${environment}'.`);
+			t.true(
+				isIdentifier(name) || isEsIdentifier(environment, name),
+				`Object name '${name}' in '${environment}' is not a valid identifier.`,
+			);
+			t.is(typeof value, 'boolean', `Value of object '${name}' in '${environment}' should be a boolean.`);
+		}
+	}
 });
+
+function isEsIdentifier(environment, name) {
+	return (
+		(environment === 'builtin' || /^es(?:3|5|\d{4})$/.test(environment))
+		&& (
+			name === 'eval'
+			|| name === 'globalThis'
+			|| name === 'Infinity'
+			|| name === 'NaN'
+			|| name === 'undefined'
+		)
+	);
+}