web/NPM Workspaces: ESbuild version cleanup (#14541)

* web: Check JS files. Add types.

* web: Fix issues surrounding Vite/ESBuild types.

* web: Clean up version constants. Tidy types

* web: Clean up docs, types.

* web: Clean up package paths.

* web: (ESLint) no-lonely-if

* web: Render slot before navbar.

* web: Fix line-height alignment.

* web: Truncate long headers.

* web: Clean up page header declarations. Add story. Update paths.

* web: Ignore out directory.

* web: Lint Lit.

* web: Use private alias.

* web: Fix implicit CJS mode.

* web: Update deps.

* web: await all imports.

web/packages/core/scripting/node.js

@@ -0,0 +1,41 @@
+import { createRequire } from "node:module";
+import * as path from "node:path";
+import * as process from "node:process";
+import { fileURLToPath } from "node:url";
+
+/**
+ * Predicate to determine if a module was run directly, i.e. not imported.
+ *
+ * @param {ImportMeta} meta The `import.meta` object of the module.
+ *
+ * @return {boolean} Whether the module was run directly.
+ * @runtime node
+ */
+export function isMain(meta) {
+    // Are we not in a module context?
+    if (!meta) return false;
+
+    const relativeScriptPath = process.argv[1];
+
+    if (!relativeScriptPath) return false;
+
+    const require = createRequire(meta.url);
+    const absoluteScriptPath = require.resolve(relativeScriptPath);
+
+    const modulePath = fileURLToPath(meta.url);
+
+    const scriptExtension = path.extname(absoluteScriptPath);
+
+    if (scriptExtension) {
+        return modulePath === absoluteScriptPath;
+    }
+
+    const moduleExtension = path.extname(modulePath);
+
+    if (moduleExtension) {
+        return absoluteScriptPath === modulePath.slice(0, -moduleExtension.length);
+    }
+
+    // If both are without extension, compare them directly.
+    return modulePath === absoluteScriptPath;
+}