fix: more meaningful chunk filename (#381)

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### Description

Closes #49.

<!-- Please insert your description here and provide especially info about the "what" this PR is solving -->

### Test Plan

<!-- e.g. is there anything you'd like reviewers to focus on? -->

---

crates/rolldown/src/bundler/module_loader/runtime_normal_module_task.rs

@@ -57,9 +57,8 @@ impl RuntimeNormalModuleTask {
     builder.id = Some(self.module_id);
     builder.ast = Some(ast);
     builder.repr_name = Some(repr_name);
-    builder.path = Some(ResourceId::new(
-      "TODO: Runtime module should not have FilePath as source id".to_string().into(),
-    ));
+    // TODO: Runtime module should not have FilePath as source id
+    builder.path = Some(ResourceId::new("runtime".to_string().into()));
     builder.named_imports = Some(named_imports);
     builder.named_exports = Some(named_exports);
     builder.stmt_infos = Some(stmt_infos);

crates/rolldown/src/bundler/stages/bundle_stage.rs

@@ -309,9 +309,7 @@ impl<'a> BundleStage<'a> {
         chunks[chunk_id].modules.push(module.id());
         module_to_chunk[module.id()] = Some(chunk_id);
       } else {
-        let len = bits_to_chunk.len();
-        // FIXME: https://github.com/rolldown-rs/rolldown/issues/49
-        let chunk = Chunk::new(Some(len.to_string()), None, bits.clone(), vec![module.id()]);
+        let chunk = Chunk::new(None, None, bits.clone(), vec![module.id()]);
         let chunk_id = chunks.push(chunk);
         module_to_chunk[module.id()] = Some(chunk_id);
         bits_to_chunk.insert(bits.clone(), chunk_id);

crates/rolldown/tests/esbuild/default/duplicate_entry_point/artifacts.snap

@@ -5,19 +5,19 @@ input_file: crates/rolldown/tests/esbuild/default/duplicate_entry_point
 ---
 # Assets
 
-## 2.mjs
+## entry_js.mjs
 
 ```js
-// entry.js
-console.log(123)
+
 ```
 ## entry_js.mjs
 
 ```js
 
 ```
-## entry_js.mjs
+## runtime.mjs
 
 ```js
-
+// entry.js
+console.log(123)
 ```

crates/rolldown/tests/esbuild/default/outbase/artifacts.snap

@@ -5,11 +5,6 @@ input_file: crates/rolldown/tests/esbuild/default/outbase
 ---
 # Assets
 
-## 2.mjs
-
-```js
-
-```
 ## c_js.mjs
 
 ```js
@@ -22,3 +17,8 @@ console.log('c')
 // d.js
 console.log('d')
 ```
+## runtime.mjs
+
+```js
+
+```

crates/rolldown/tests/esbuild/default/var_relocating_bundle/artifacts.snap

@@ -5,11 +5,6 @@ input_file: crates/rolldown/tests/esbuild/default/var_relocating_bundle
 ---
 # Assets
 
-## 5.mjs
-
-```js
-
-```
 ## function-nested_js.mjs
 
 ```js
@@ -76,6 +71,11 @@ if (true) {
 	for (var { j, x: [k] } in {});
 	function l() {}
 }
+```
+## runtime.mjs
+
+```js
+
 ```
 ## top-level_js.mjs
 

crates/rolldown/tests/esbuild/splitting/assign-to-local/artifacts.snap

@@ -5,20 +5,10 @@ input_file: crates/rolldown/tests/esbuild/splitting/assign-to-local
 ---
 # Assets
 
-## 2.mjs
-
-```js
-// shared.js
-let foo
-function setFoo(value) {
-    foo = value
-}
-export { foo, setFoo };
-```
 ## a.mjs
 
 ```js
-import { foo, setFoo } from "./2.mjs";
+import { foo, setFoo } from "./runtime.mjs";
 
 // a.js
 
@@ -28,9 +18,19 @@ console.log(foo)
 ## b.mjs
 
 ```js
-import { foo } from "./2.mjs";
+import { foo } from "./runtime.mjs";
 
 // b.js
 
 console.log(foo)
 ```
+## runtime.mjs
+
+```js
+// shared.js
+let foo
+function setFoo(value) {
+    foo = value
+}
+export { foo, setFoo };
+```

crates/rolldown/tests/esbuild/splitting/cross_chunk_assignment_dependencies/artifacts.snap

@@ -5,7 +5,21 @@ input_file: crates/rolldown/tests/esbuild/splitting/cross_chunk_assignment_depen
 ---
 # Assets
 
-## 2.mjs
+## a.mjs
+
+```js
+import { setValue } from "./runtime.mjs";
+
+// a.js
+
+setValue(123)
+```
+## b.mjs
+
+```js
+// b.js
+```
+## runtime.mjs
 
 ```js
 // shared.js
@@ -24,17 +38,3 @@ function setValue(next) {
 sideEffects(getValue);
 export { setValue };
 ```
-## a.mjs
-
-```js
-import { setValue } from "./2.mjs";
-
-// a.js
-
-setValue(123)
-```
-## b.mjs
-
-```js
-// b.js
-```

crates/rolldown/tests/esbuild/splitting/duplicate_chunk_collision/artifacts.snap

@@ -5,40 +5,40 @@ input_file: crates/rolldown/tests/esbuild/splitting/duplicate_chunk_collision
 ---
 # Assets
 
-## 4.mjs
+## a.mjs
 
 ```js
-
+// a.js
 ```
-## 5.mjs
+## ab_js.mjs
 
 ```js
-// cd.js
+// ab.js
 console.log(123)
-// d.js
 ```
-## 6.mjs
+## b.mjs
 
 ```js
-// ab.js
-console.log(123)
+// b.js
 ```
-## a.mjs
+## cd_js.mjs
 
 ```js
-// a.js
+// cd.js
+console.log(123)
+// d.js
 ```
-## b.mjs
+## d.mjs
 
 ```js
-// b.js
+
 ```
 ## d.mjs
 
 ```js
 
 ```
-## d.mjs
+## runtime.mjs
 
 ```js
 

crates/rolldown/tests/esbuild/splitting/dynamic-commonjs-into-es6/artifacts.snap

@@ -5,22 +5,10 @@ input_file: crates/rolldown/tests/esbuild/splitting/dynamic-commonjs-into-es6
 ---
 # Assets
 
-## 2.mjs
-
-```js
-// <runtime>
-
-var __getOwnPropNames = Object.getOwnPropertyNames
-var __commonJS = (cb, mod) => function () {
-  return mod || (0, cb[__getOwnPropNames(cb)[0]])((mod = { exports: {} }).exports, mod), mod.exports
-}
-
-export { __commonJS };
-```
 ## foo_js.mjs
 
 ```js
-import { __commonJS } from "./2.mjs";
+import { __commonJS } from "./runtime.mjs";
 
 // foo.js
 var require_foo = __commonJS({
@@ -36,3 +24,15 @@ export default require_foo();
 // main.js
 import('./foo_js.mjs').then(({bar}) => console.log(bar))
 ```
+## runtime.mjs
+
+```js
+// <runtime>
+
+var __getOwnPropNames = Object.getOwnPropertyNames
+var __commonJS = (cb, mod) => function () {
+  return mod || (0, cb[__getOwnPropNames(cb)[0]])((mod = { exports: {} }).exports, mod), mod.exports
+}
+
+export { __commonJS };
+```

crates/rolldown/tests/esbuild/splitting/dynamic-es6-into-es6/artifacts.snap

@@ -5,11 +5,6 @@ input_file: crates/rolldown/tests/esbuild/splitting/dynamic-es6-into-es6
 ---
 # Assets
 
-## 2.mjs
-
-```js
-
-```
 ## foo_js.mjs
 
 ```js
@@ -23,3 +18,8 @@ export { bar };
 // main.js
 import('./foo_js.mjs').then(({bar}) => console.log(bar))
 ```
+## runtime.mjs
+
+```js
+
+```

crates/rolldown/tests/esbuild/splitting/dynamic_and_not_dynamic_es6_into_es6/artifacts.snap

@@ -5,26 +5,26 @@ input_file: crates/rolldown/tests/esbuild/splitting/dynamic_and_not_dynamic_es6_
 ---
 # Assets
 
-## 2.mjs
-
-```js
-// foo.js
-let bar = 123
-export { bar };
-```
 ## foo_js.mjs
 
 ```js
-import { bar } from "./2.mjs";
+import { bar } from "./runtime.mjs";
 
 export { bar };
 ```
 ## main.mjs
 
 ```js
-import { bar } from "./2.mjs";
+import { bar } from "./runtime.mjs";
 
 // main.js
 
-import('./2.mjs').then(({bar: b}) => console.log(bar, b))
+import('./runtime.mjs').then(({bar: b}) => console.log(bar, b))
+```
+## runtime.mjs
+
+```js
+// foo.js
+let bar = 123
+export { bar };
 ```

crates/rolldown/tests/esbuild/splitting/dynamic_import_issue_272/artifacts.snap

@@ -5,11 +5,6 @@ input_file: crates/rolldown/tests/esbuild/splitting/dynamic_import_issue_272
 ---
 # Assets
 
-## 2.mjs
-
-```js
-
-```
 ## a.mjs
 
 ```js
@@ -23,3 +18,8 @@ import('./b.mjs')
 var b_default = 1
 export { b_default as default };
 ```
+## runtime.mjs
+
+```js
+
+```

crates/rolldown/tests/esbuild/splitting/hybrid_esm_and_cjs_issue617/artifacts.snap

@@ -5,7 +5,23 @@ input_file: crates/rolldown/tests/esbuild/splitting/hybrid_esm_and_cjs_issue617
 ---
 # Assets
 
-## 2.mjs
+## a.mjs
+
+```js
+import { foo } from "./runtime.mjs";
+
+export { foo };
+```
+## b.mjs
+
+```js
+import { __toCommonJS, a_ns, init_a } from "./runtime.mjs";
+
+// b.js
+let bar = (init_a(), __toCommonJS(a_ns))
+export { bar };
+```
+## runtime.mjs
 
 ```js
 // <runtime>
@@ -40,19 +56,3 @@ var init_a = __esm({
 });
 export { __toCommonJS, a_ns, foo, init_a };
 ```
-## a.mjs
-
-```js
-import { foo } from "./2.mjs";
-
-export { foo };
-```
-## b.mjs
-
-```js
-import { __toCommonJS, a_ns, init_a } from "./2.mjs";
-
-// b.js
-let bar = (init_a(), __toCommonJS(a_ns))
-export { bar };
-```