nestjs: include tslib in code instead of externalizing it

packages/nestjs/rollup.config.mjs

@@ -7,6 +7,35 @@ import packageJson from './package.json' with { type: 'json' };
 
 const extensions = ['.js', '.ts'];
 
+/**
+ * Include and exclude externals based on patterns.
+ * If module is included, is is treated as NOT external.
+ *
+ * Include is resolved first, then exclude.
+ * If both patterns miss, the module is included.
+ */
+function externals({ include, exclude }) {
+    function test(pattern, id) {
+        if (pattern instanceof RegExp) {
+            return pattern.test(id);
+        }
+
+        return pattern === id;
+    }
+
+    return (id) => {
+        if (include.some((pattern) => test(pattern, id))) {
+            return false;
+        }
+
+        if (exclude.some((pattern) => test(pattern, id))) {
+            return true;
+        }
+
+        return false;
+    };
+}
+
 /** @type {import('rollup').RollupOptions} */
 export default {
     input: './src/index.ts',
@@ -22,7 +51,10 @@ export default {
             sourcemap: true,
         },
     ],
-    external: [/\/node_modules\//, '@backtrace/node'],
+    external: externals({
+        include: [/tslib/],
+        exclude: [/\/node_modules\//, '@backtrace/node'],
+    }),
     plugins: [
         typescript({ tsconfig: './tsconfig.build.json' }),
         nodeResolve({ extensions, preferBuiltins: true }),