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+# Module metadata
+
+## Concepts
+
+- [import.meta](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import.meta)
+  can provide information on the context of the module
+- The boolean
+  [import.meta.main](https://doc.deno.land/builtin/stable#ImportMeta) will let
+  you know if the current module is the program entry point
+- The string [import.meta.url](https://doc.deno.land/builtin/stable#ImportMeta)
+  will give you the URL of the current module
+- The string
+  [Deno.mainModule](https://doc.deno.land/builtin/stable#Deno.mainModule) will
+  give you the URL of the main module entry point, i.e. the module invoked by
+  the deno runtime
+
+## Example
+
+The example below uses two modules to show the difference between
+`import.meta.url`, `import.meta.main` and `Deno.mainModule`. In this example,
+`module_a.ts` is the main module entry point
+
+```ts
+/**
+ * module_b.ts
+ */
+export function outputB() {
+  console.log("Module B's import.meta.url", import.meta.url);
+  console.log("Module B's mainModule url", Deno.mainModule);
+  console.log(
+    "Is module B the main module via import.meta.main?",
+    import.meta.main,
+  );
+}
+```
+
+```ts
+/**
+ * module_a.ts
+ */
+import { outputB } from "./module_b.ts";
+
+function outputA() {
+  console.log("Module A's import.meta.url", import.meta.url);
+  console.log("Module A's mainModule url", Deno.mainModule);
+  console.log(
+    "Is module A the main module via import.meta.main?",
+    import.meta.main,
+  );
+}
+
+outputA();
+console.log("");
+outputB();
+```
+
+If `module_a.ts` is located in `/home/alice/deno` then the output of
+`deno run --allow-read module_a.ts` is:
+
+```
+Module A's import.meta.url file:///home/alice/deno/module_a.ts
+Module A's mainModule url file:///home/alice/deno/module_a.ts
+Is module A the main module via import.meta.main? true
+
+Module B's import.meta.url file:///home/alice/deno/module_b.ts
+Module B's mainModule url file:///home/alice/deno/module_a.ts
+Is module B the main module via import.meta.main? false
+```