diff --git a/crates/pack-core/src/library/chunking_context.rs b/crates/pack-core/src/library/chunking_context.rs
index 1f415a7df..36fafe2e8 100644
--- a/crates/pack-core/src/library/chunking_context.rs
+++ b/crates/pack-core/src/library/chunking_context.rs
@@ -394,16 +394,23 @@ impl LibraryChunkingContext {
                 let chunk_content_hash =
                     self.ecmascript_chunk_content_hash(ecmascript_chunk).await?;
                 let other_chunks = other_chunks.await?;
-                let content_hash = if other_chunks.is_empty() {
-                    chunk_content_hash.to_string()
-                } else {
-                    let mut hasher = Xxh3Hash64Hasher::new();
-                    hasher.write_value(chunk_content_hash.as_str());
-                    for asset in other_chunks.iter() {
-                        hasher.write_value(asset.path().await?.path.as_str());
-                    }
-                    encode_hex(hasher.finish())
-                };
+                // The entry wrapper publishes the library namespace and export path.
+                // Include its configuration even when there are no other chunks, so
+                // changed exports cannot reuse a URL that still serves an old wrapper.
+                // Shared non-entry chunks retain their module-only content hashes.
+                let mut hasher = Xxh3Hash64Hasher::new();
+                hasher.write_value("library-evaluate-v1");
+                hasher.write_value(chunk_content_hash.as_str());
+                hasher.write_ref(&this.runtime_root);
+                hasher.write_ref(&this.runtime_export);
+                hasher.write_value(this.is_node_platform);
+                hasher.write_value(this.output_root_to_root_path.as_str());
+                hasher.write_ref(&this.asset_base_path);
+                hasher.write_ref(&this.source_maps_type);
+                for asset in other_chunks.iter() {
+                    hasher.write_value(asset.path().await?.path.as_str());
+                }
+                let content_hash = encode_hex(hasher.finish());
                 filename = replace_content_hash_placeholder(&filename, &content_hash);
             };
             AssetIdent::from_path(root.join(&filename)?)
diff --git a/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/entries/server.5d80c3de.js b/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/entries/server.882b3b69.js
similarity index 99%
rename from crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/entries/server.5d80c3de.js
rename to crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/entries/server.882b3b69.js
index a8ee2a340..8a0616146 100644
--- a/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/entries/server.5d80c3de.js
+++ b/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/entries/server.882b3b69.js
@@ -961,7 +961,7 @@ if (typeof exports === 'object' && typeof module === 'object') {
     for(var i in a) globalThis[i] = a[i];
 }
 })([
-["entries/server.5d80c3de.js",
+["entries/server.882b3b69.js",
 
 "[project]/basic/multi_server_entries/input/server.ts [server] (ecmascript)", ((__turbopack_context__) => {
 "use strict";
@@ -972,5 +972,5 @@ var __TURBOPACK__imported__module__$5b$project$5d2f$basic$2f$multi_server_entrie
 console.log("server runtime", __TURBOPACK__imported__module__$5b$project$5d2f$basic$2f$multi_server_entries$2f$input$2f$shared$2e$ts__$5b$server$5d$__$28$ecmascript$29$__["shared"]);
 }),
 ],
-["entries/server.5d80c3de.js", {"otherChunks":["chunks/server-shared.fbcd5f75.js","chunks/server-shared-0-1.1b081f62.js"],"runtimeModuleIds":["[project]/basic/multi_server_entries/input/server.ts [server] (ecmascript)"]}],
+["entries/server.882b3b69.js", {"otherChunks":["chunks/server-shared.fbcd5f75.js","chunks/server-shared-0-1.1b081f62.js"],"runtimeModuleIds":["[project]/basic/multi_server_entries/input/server.ts [server] (ecmascript)"]}],
 ]);
\ No newline at end of file
diff --git a/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/stats.json b/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/stats.json
index 81282c96b..fcb114925 100644
--- a/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/stats.json
+++ b/crates/pack-tests/tests/snapshot/basic/multi_server_entries/output/server/stats.json
@@ -4,14 +4,14 @@
       "name": "detail-server",
       "chunks": [
         "chunks/server-shared.fbcd5f75.js",
-        "entries/detail-server.5d841f26.js"
+        "entries/detail-server.b1ab83f5.js"
       ],
       "assets": [
         {
           "name": "chunks/server-shared.fbcd5f75.js"
         },
         {
-          "name": "entries/detail-server.5d841f26.js"
+          "name": "entries/detail-server.b1ab83f5.js"
         }
       ]
     },
@@ -20,7 +20,7 @@
       "chunks": [
         "chunks/server-shared-0-1.1b081f62.js",
         "chunks/server-shared.fbcd5f75.js",
-        "entries/index-server.5c83aa4e.js"
+        "entries/index-server.f88edfa9.js"
       ],
       "assets": [
         {
@@ -30,7 +30,7 @@
           "name": "chunks/server-shared.fbcd5f75.js"
         },
         {
-          "name": "entries/index-server.5c83aa4e.js"
+          "name": "entries/index-server.f88edfa9.js"
         }
       ]
     },
@@ -39,7 +39,7 @@
       "chunks": [
         "chunks/server-shared-0-1.1b081f62.js",
         "chunks/server-shared.fbcd5f75.js",
-        "entries/server.5d80c3de.js"
+        "entries/server.882b3b69.js"
       ],
       "assets": [
         {
@@ -49,7 +49,7 @@
           "name": "chunks/server-shared.fbcd5f75.js"
         },
         {
-          "name": "entries/server.5d80c3de.js"
+          "name": "entries/server.882b3b69.js"
         }
       ]
     }
@@ -84,11 +84,11 @@
       "initial": false,
       "entry": false,
       "recorded": false,
-      "id": "entries/detail-server.5d841f26.js",
+      "id": "entries/detail-server.b1ab83f5.js",
       "size": 39218,
       "hash": "",
       "files": [
-        "entries/detail-server.5d841f26.js"
+        "entries/detail-server.b1ab83f5.js"
       ]
     },
     {
@@ -96,11 +96,11 @@
       "initial": false,
       "entry": false,
       "recorded": false,
-      "id": "entries/index-server.5c83aa4e.js",
+      "id": "entries/index-server.f88edfa9.js",
       "size": 39230,
       "hash": "",
       "files": [
-        "entries/index-server.5c83aa4e.js"
+        "entries/index-server.f88edfa9.js"
       ]
     },
     {
@@ -108,11 +108,11 @@
       "initial": false,
       "entry": false,
       "recorded": false,
-      "id": "entries/server.5d80c3de.js",
+      "id": "entries/server.882b3b69.js",
       "size": 39197,
       "hash": "",
       "files": [
-        "entries/server.5d80c3de.js"
+        "entries/server.882b3b69.js"
       ]
     }
   ],
@@ -143,38 +143,38 @@
     },
     {
       "type": "asset",
-      "name": "entries/detail-server.5d841f26.js",
+      "name": "entries/detail-server.b1ab83f5.js",
       "info": {},
       "size": 39218,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/detail-server.5d841f26.js"
+        "entries/detail-server.b1ab83f5.js"
       ]
     },
     {
       "type": "asset",
-      "name": "entries/index-server.5c83aa4e.js",
+      "name": "entries/index-server.f88edfa9.js",
       "info": {},
       "size": 39230,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/index-server.5c83aa4e.js"
+        "entries/index-server.f88edfa9.js"
       ]
     },
     {
       "type": "asset",
-      "name": "entries/server.5d80c3de.js",
+      "name": "entries/server.882b3b69.js",
       "info": {},
       "size": 39197,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/server.5d80c3de.js"
+        "entries/server.882b3b69.js"
       ]
     }
   ],
@@ -183,7 +183,7 @@
       "name": "basic/multi_server_entries/input/detail.server.ts",
       "id": "[project]/basic/multi_server_entries/input/detail.server.ts [server] (ecmascript)",
       "chunks": [
-        "entries/detail-server.5d841f26.js"
+        "entries/detail-server.b1ab83f5.js"
       ],
       "size": 536
     },
@@ -191,7 +191,7 @@
       "name": "basic/multi_server_entries/input/index.server.ts",
       "id": "[project]/basic/multi_server_entries/input/index.server.ts [server] (ecmascript)",
       "chunks": [
-        "entries/index-server.5c83aa4e.js"
+        "entries/index-server.f88edfa9.js"
       ],
       "size": 514
     },
@@ -199,7 +199,7 @@
       "name": "basic/multi_server_entries/input/server.ts",
       "id": "[project]/basic/multi_server_entries/input/server.ts [server] (ecmascript)",
       "chunks": [
-        "entries/server.5d80c3de.js"
+        "entries/server.882b3b69.js"
       ],
       "size": 511
     },
diff --git a/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.6de379ea.js b/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.ae483216.js
similarity index 99%
rename from crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.6de379ea.js
rename to crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.ae483216.js
index be7740c36..053419c3b 100644
--- a/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.6de379ea.js
+++ b/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.ae483216.js
@@ -961,7 +961,7 @@ if (typeof exports === 'object' && typeof module === 'object') {
     for(var i in a) globalThis[i] = a[i];
 }
 })([
-["entries/server.6de379ea.js",
+["entries/server.ae483216.js",
 
 "[project]/basic/multi_server_entries_sourcemap/input/server.ts [server] (ecmascript)", ((__turbopack_context__) => {
 "use strict";
@@ -972,8 +972,8 @@ var __TURBOPACK__imported__module__$5b$project$5d2f$basic$2f$multi_server_entrie
 console.log("server runtime", __TURBOPACK__imported__module__$5b$project$5d2f$basic$2f$multi_server_entries_sourcemap$2f$input$2f$shared$2e$ts__$5b$server$5d$__$28$ecmascript$29$__["shared"]);
 }),
 ],
-["entries/server.6de379ea.js", {"otherChunks":["chunks/server-shared.c1005744.js","chunks/server-shared-0-1.8d3d3911.js"],"runtimeModuleIds":["[project]/basic/multi_server_entries_sourcemap/input/server.ts [server] (ecmascript)"]}],
+["entries/server.ae483216.js", {"otherChunks":["chunks/server-shared.c1005744.js","chunks/server-shared-0-1.8d3d3911.js"],"runtimeModuleIds":["[project]/basic/multi_server_entries_sourcemap/input/server.ts [server] (ecmascript)"]}],
 ]);
 
 
-//# sourceMappingURL=server.6de379ea.js.map
\ No newline at end of file
+//# sourceMappingURL=server.ae483216.js.map
\ No newline at end of file
diff --git a/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.6de379ea.js.map b/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.ae483216.js.map
similarity index 100%
rename from crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.6de379ea.js.map
rename to crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/entries/server.ae483216.js.map
diff --git a/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/stats.json b/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/stats.json
index d94cc653c..b7cf59ede 100644
--- a/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/stats.json
+++ b/crates/pack-tests/tests/snapshot/basic/multi_server_entries_sourcemap/output/server/stats.json
@@ -4,14 +4,14 @@
       "name": "detail-server",
       "chunks": [
         "chunks/server-shared.c1005744.js",
-        "entries/detail-server.2c817ca8.js"
+        "entries/detail-server.ee516a06.js"
       ],
       "assets": [
         {
           "name": "chunks/server-shared.c1005744.js"
         },
         {
-          "name": "entries/detail-server.2c817ca8.js"
+          "name": "entries/detail-server.ee516a06.js"
         }
       ]
     },
@@ -20,7 +20,7 @@
       "chunks": [
         "chunks/server-shared-0-1.8d3d3911.js",
         "chunks/server-shared.c1005744.js",
-        "entries/index-server.3095d849.js"
+        "entries/index-server.e774a8a8.js"
       ],
       "assets": [
         {
@@ -30,7 +30,7 @@
           "name": "chunks/server-shared.c1005744.js"
         },
         {
-          "name": "entries/index-server.3095d849.js"
+          "name": "entries/index-server.e774a8a8.js"
         }
       ]
     },
@@ -39,7 +39,7 @@
       "chunks": [
         "chunks/server-shared-0-1.8d3d3911.js",
         "chunks/server-shared.c1005744.js",
-        "entries/server.6de379ea.js"
+        "entries/server.ae483216.js"
       ],
       "assets": [
         {
@@ -49,7 +49,7 @@
           "name": "chunks/server-shared.c1005744.js"
         },
         {
-          "name": "entries/server.6de379ea.js"
+          "name": "entries/server.ae483216.js"
         }
       ]
     }
@@ -84,11 +84,11 @@
       "initial": false,
       "entry": false,
       "recorded": false,
-      "id": "entries/detail-server.2c817ca8.js",
+      "id": "entries/detail-server.ee516a06.js",
       "size": 39344,
       "hash": "",
       "files": [
-        "entries/detail-server.2c817ca8.js"
+        "entries/detail-server.ee516a06.js"
       ]
     },
     {
@@ -96,11 +96,11 @@
       "initial": false,
       "entry": false,
       "recorded": false,
-      "id": "entries/index-server.3095d849.js",
+      "id": "entries/index-server.e774a8a8.js",
       "size": 39355,
       "hash": "",
       "files": [
-        "entries/index-server.3095d849.js"
+        "entries/index-server.e774a8a8.js"
       ]
     },
     {
@@ -108,11 +108,11 @@
       "initial": false,
       "entry": false,
       "recorded": false,
-      "id": "entries/server.6de379ea.js",
+      "id": "entries/server.ae483216.js",
       "size": 39316,
       "hash": "",
       "files": [
-        "entries/server.6de379ea.js"
+        "entries/server.ae483216.js"
       ]
     }
   ],
@@ -167,74 +167,74 @@
     },
     {
       "type": "asset",
-      "name": "entries/detail-server.2c817ca8.js",
+      "name": "entries/detail-server.ee516a06.js",
       "info": {},
       "size": 39344,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/detail-server.2c817ca8.js"
+        "entries/detail-server.ee516a06.js"
       ]
     },
     {
       "type": "asset",
-      "name": "entries/detail-server.2c817ca8.js.map",
+      "name": "entries/detail-server.ee516a06.js.map",
       "info": {},
       "size": 63290,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/detail-server.2c817ca8.js.map"
+        "entries/detail-server.ee516a06.js.map"
       ]
     },
     {
       "type": "asset",
-      "name": "entries/index-server.3095d849.js",
+      "name": "entries/index-server.e774a8a8.js",
       "info": {},
       "size": 39355,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/index-server.3095d849.js"
+        "entries/index-server.e774a8a8.js"
       ]
     },
     {
       "type": "asset",
-      "name": "entries/index-server.3095d849.js.map",
+      "name": "entries/index-server.e774a8a8.js.map",
       "info": {},
       "size": 63278,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/index-server.3095d849.js.map"
+        "entries/index-server.e774a8a8.js.map"
       ]
     },
     {
       "type": "asset",
-      "name": "entries/server.6de379ea.js",
+      "name": "entries/server.ae483216.js",
       "info": {},
       "size": 39316,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/server.6de379ea.js"
+        "entries/server.ae483216.js"
       ]
     },
     {
       "type": "asset",
-      "name": "entries/server.6de379ea.js.map",
+      "name": "entries/server.ae483216.js.map",
       "info": {},
       "size": 63269,
       "emitted": false,
       "comparedForEmit": false,
       "cached": false,
       "chunks": [
-        "entries/server.6de379ea.js.map"
+        "entries/server.ae483216.js.map"
       ]
     }
   ],
@@ -243,7 +243,7 @@
       "name": "basic/multi_server_entries_sourcemap/input/detail.server.ts",
       "id": "[project]/basic/multi_server_entries_sourcemap/input/detail.server.ts [server] (ecmascript)",
       "chunks": [
-        "entries/detail-server.2c817ca8.js"
+        "entries/detail-server.ee516a06.js"
       ],
       "size": 566
     },
@@ -251,7 +251,7 @@
       "name": "basic/multi_server_entries_sourcemap/input/index.server.ts",
       "id": "[project]/basic/multi_server_entries_sourcemap/input/index.server.ts [server] (ecmascript)",
       "chunks": [
-        "entries/index-server.3095d849.js"
+        "entries/index-server.e774a8a8.js"
       ],
       "size": 544
     },
@@ -259,7 +259,7 @@
       "name": "basic/multi_server_entries_sourcemap/input/server.ts",
       "id": "[project]/basic/multi_server_entries_sourcemap/input/server.ts [server] (ecmascript)",
       "chunks": [
-        "entries/server.6de379ea.js"
+        "entries/server.ae483216.js"
       ],
       "size": 541
     },
diff --git a/crates/pack-tests/tests/snapshot/library/extract-comments-sourcemap/output/main.91d2ac1b.js b/crates/pack-tests/tests/snapshot/library/extract-comments-sourcemap/output/main.ab5ee3cf.js
similarity index 97%
rename from crates/pack-tests/tests/snapshot/library/extract-comments-sourcemap/output/main.91d2ac1b.js
rename to crates/pack-tests/tests/snapshot/library/extract-comments-sourcemap/output/main.ab5ee3cf.js
index 9c6b166b8..50b4d3c53 100644
--- a/crates/pack-tests/tests/snapshot/library/extract-comments-sourcemap/output/main.91d2ac1b.js
+++ b/crates/pack-tests/tests/snapshot/library/extract-comments-sourcemap/output/main.ab5ee3cf.js
@@ -1,4 +1,4 @@
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+/*! For license information please see main.188a777b.js.LICENSE.txt */
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diff --git a/crates/pack-tests/tests/snapshot/library/extract-comments/output/main.936466c5.js.LICENSE.txt b/crates/pack-tests/tests/snapshot/library/extract-comments/output/main.188a777b.js.LICENSE.txt
similarity index 100%
rename from crates/pack-tests/tests/snapshot/library/extract-comments/output/main.936466c5.js.LICENSE.txt
rename to crates/pack-tests/tests/snapshot/library/extract-comments/output/main.188a777b.js.LICENSE.txt
diff --git a/packages/pack/src/__test__/libraryContentHash.test.ts b/packages/pack/src/__test__/libraryContentHash.test.ts
new file mode 100644
index 000000000..cc174e544
--- /dev/null
+++ b/packages/pack/src/__test__/libraryContentHash.test.ts
@@ -0,0 +1,113 @@
+import { spawn } from "node:child_process";
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+
+const testDir = path.dirname(fileURLToPath(import.meta.url));
+const packageRoot = path.resolve(testDir, "../..");
+const repoRoot = path.resolve(packageRoot, "../..");
+const childScript = path.join(testDir, "libraryContentHashChild.ts");
+const viteNode = path.join(repoRoot, "node_modules/vite-node/vite-node.mjs");
+
+function runLibraryContentHashFixture() {
+  return new Promise<unknown>((resolve, reject) => {
+    const targetDir = path.join(repoRoot, "target");
+    fs.mkdirSync(targetDir, { recursive: true });
+    const projectPath = fs.mkdtempSync(
+      path.join(targetDir, "library-content-hash-"),
+    );
+    const child = spawn(
+      process.execPath,
+      [viteNode, childScript, projectPath],
+      {
+        cwd: packageRoot,
+        env: {
+          ...process.env,
+          NODE_PATH: [
+            path.join(packageRoot, "node_modules"),
+            path.join(repoRoot, "node_modules"),
+            process.env.NODE_PATH,
+          ]
+            .filter(Boolean)
+            .join(path.delimiter),
+        },
+        stdio: ["ignore", "pipe", "pipe"],
+      },
+    );
+
+    let stdout = "";
+    let stderr = "";
+    let settled = false;
+    let timedOut = false;
+    const timer = setTimeout(() => {
+      timedOut = true;
+      child.kill("SIGKILL");
+    }, 25_000);
+    child.stdout.on("data", (chunk) => {
+      stdout += chunk;
+    });
+    child.stderr.on("data", (chunk) => {
+      stderr += chunk;
+    });
+    const settle = (error: unknown | null, result?: unknown) => {
+      if (settled) return;
+      settled = true;
+      clearTimeout(timer);
+      try {
+        fs.rmSync(projectPath, { recursive: true, force: true });
+      } catch (cleanupError) {
+        error ??= cleanupError;
+      }
+      if (error) reject(error);
+      else resolve(result);
+    };
+
+    child.once("error", (error) => {
+      settle(error);
+    });
+    child.once("close", (code, signal) => {
+      if (settled) return;
+      try {
+        if (timedOut) {
+          throw new Error("library content hash fixture timed out after 25s");
+        }
+        if (code !== 0) {
+          throw new Error(
+            `library content hash fixture failed with code ${code}, signal ${signal}\n${stderr}\n${stdout}`,
+          );
+        }
+        const line = stdout
+          .split(/\r?\n/)
+          .find((value) => value.startsWith("__LIBRARY_CONTENT_HASH__"));
+        if (!line) {
+          throw new Error(
+            `library content hash fixture did not print results\n${stderr}\n${stdout}`,
+          );
+        }
+        settle(null, JSON.parse(line.slice("__LIBRARY_CONTENT_HASH__".length)));
+      } catch (error) {
+        settle(error);
+      }
+    });
+  });
+}
+
+describe("library content hashes", () => {
+  it("tracks the runtime library name and export path while identical builds remain stable", async () => {
+    await expect(runLibraryContentHashFixture()).resolves.toEqual({
+      sameConfigStableFilename: true,
+      sameConfigStableBody: true,
+      libraryNameChangesFilename: true,
+      libraryNameChangesBody: true,
+      exportPathChangesFilename: true,
+      exportPathChangesBody: true,
+      exports: [
+        { type: "function", value: "default-widget" },
+        { type: "function", value: "default-widget" },
+        { type: "function", value: "default-widget" },
+        { type: "function", value: "nested-widget" },
+      ],
+    });
+  }, 30_000);
+});
diff --git a/packages/pack/src/__test__/libraryContentHashChild.ts b/packages/pack/src/__test__/libraryContentHashChild.ts
new file mode 100644
index 000000000..fcbc56918
--- /dev/null
+++ b/packages/pack/src/__test__/libraryContentHashChild.ts
@@ -0,0 +1,104 @@
+import fs from "node:fs";
+import path from "node:path";
+import vm from "node:vm";
+import { build } from "../commands/build";
+
+async function main() {
+  const projectPath = process.argv[2];
+  if (!projectPath || !path.isAbsolute(projectPath)) {
+    throw new Error("An absolute fixture directory is required");
+  }
+
+  fs.mkdirSync(path.join(projectPath, "input"), { recursive: true });
+  fs.writeFileSync(
+    path.join(projectPath, "input/index.js"),
+    `function RootWidget() { return "default-widget"; }
+RootWidget.nested = {
+  Widget: function NestedWidget() { return "nested-widget"; }
+};
+export default RootWidget;
+`,
+  );
+
+  async function buildLibrary(
+    directory: string,
+    libraryName: string,
+    exportPath: string[],
+  ) {
+    const outputPath = path.join(projectPath, directory);
+    await build(
+      {
+        buildId: "library-content-hash-test",
+        tracing: false,
+        config: {
+          entry: [
+            {
+              name: "index",
+              import: "./input/index.js",
+              library: { name: libraryName, export: exportPath },
+            },
+          ],
+          mode: "production",
+          persistentCaching: false,
+          cacheDirectory: path.join(projectPath, ".cache"),
+          sourceMaps: false,
+          output: {
+            path: outputPath,
+            filename: "index.[contenthash:8].umd.min.js",
+          },
+          optimization: { minify: true, moduleIds: "named" },
+        },
+      },
+      projectPath,
+      projectPath,
+    );
+
+    const scripts = fs
+      .readdirSync(outputPath)
+      .filter((file) => file.endsWith(".js"));
+    if (scripts.length !== 1) {
+      throw new Error("Expected one self-contained library script");
+    }
+    const filename = scripts[0];
+    const body = fs.readFileSync(path.join(outputPath, filename), "utf8");
+    const context: Record<string, unknown> = { URL };
+    vm.runInNewContext(body, context, { timeout: 1000 });
+    const exported = context[libraryName];
+
+    return {
+      filename,
+      body,
+      exportedType: typeof exported,
+      exportedValue: typeof exported === "function" ? exported() : undefined,
+    };
+  }
+
+  const first = await buildLibrary("first", "WidgetBuildA", ["default"]);
+  const repeated = await buildLibrary("repeated", "WidgetBuildA", ["default"]);
+  const renamed = await buildLibrary("renamed", "WidgetBuildB", ["default"]);
+  const changedExport = await buildLibrary("changed-export", "WidgetBuildA", [
+    "default",
+    "nested",
+    "Widget",
+  ]);
+
+  console.log(
+    `__LIBRARY_CONTENT_HASH__${JSON.stringify({
+      sameConfigStableFilename: first.filename === repeated.filename,
+      sameConfigStableBody: first.body === repeated.body,
+      libraryNameChangesFilename: first.filename !== renamed.filename,
+      libraryNameChangesBody: first.body !== renamed.body,
+      exportPathChangesFilename: first.filename !== changedExport.filename,
+      exportPathChangesBody: first.body !== changedExport.body,
+      exports: [first, repeated, renamed, changedExport].map((result) => ({
+        type: result.exportedType,
+        value: result.exportedValue,
+      })),
+    })}`,
+  );
+}
+
+main().catch((error) => {
+  console.error(error);
+  process.exitCode = 1;
+});