core: Format. Fix. WIP.

packages/monorepo/scripting.js

@@ -0,0 +1,40 @@
+import { createRequire } from "module";
+import * as path from "path";
+import * as process from "process";
+import { fileURLToPath } from "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.
+ */
+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;
+}