feat: support preloading also on legacy bundle

.eslintignore

@@ -1,4 +1,4 @@
 dist
 playground-temp
 temp
-
+packages/vite/src/node/__tests__/test-input/

.prettierignore

@@ -8,3 +8,4 @@ pnpm-workspace.yaml
 playground/tsconfig-json-load-error/has-error/tsconfig.json
 playground/html/invalid.html
 playground/worker/classic-worker.js
+packages/vite/src/node/__tests__/test-input/

packages/vite/src/node/__tests__/__snapshots__/utils.spec.ts.snap

@@ -0,0 +1,30 @@
+// Vitest Snapshot v1
+
+exports[`analyzeSystemRegisteration > hello 1`] = `undefined`;
+
+exports[`analyzeSystemRegisteration > minified 1`] = `
+{
+  "chunkListCode": "[\\"./chunks/index-legacy-60db70ad.js\\",\\"./chunks/singletons-legacy-a9d19225.js\\"]",
+  "exportParam": "n",
+  "moduleParam": "o",
+  "paramsCode": "(n,o)",
+}
+`;
+
+exports[`analyzeSystemRegisteration > svelte-legacy-part 1`] = `
+{
+  "chunkListCode": "['./chunks/index-legacy-60db70ad.js', './chunks/singletons-legacy-4fba2acb.js']",
+  "exportParam": "exports",
+  "moduleParam": "module",
+  "paramsCode": "(exports, module)",
+}
+`;
+
+exports[`analyzeSystemRegisteration > vue-legacy-part 1`] = `
+{
+  "chunkListCode": "[]",
+  "exportParam": "exports",
+  "moduleParam": "module",
+  "paramsCode": "(exports, module)",
+}
+`;

packages/vite/src/node/__tests__/plugins/importAnalysisBuild/__snapshots__/utils.test.ts.snap

@@ -0,0 +1,117 @@
+// Vitest Snapshot v1
+
+exports[`parse import system js > hello 1`] = `[]`;
+
+exports[`parse import system js > minified 1`] = `
+[
+  {
+    "a": -1,
+    "d": 203,
+    "e": 234,
+    "n": "./chunks/0-legacy-dd26244b.js",
+    "s": 205,
+    "se": 236,
+    "ss": 195,
+  },
+  {
+    "a": -1,
+    "d": 318,
+    "e": 349,
+    "n": "./chunks/1-legacy-3bf807d6.js",
+    "s": 320,
+    "se": 351,
+    "ss": 310,
+  },
+  {
+    "a": -1,
+    "d": 433,
+    "e": 464,
+    "n": "./chunks/2-legacy-d3251462.js",
+    "s": 435,
+    "se": 466,
+    "ss": 425,
+  },
+  {
+    "a": -1,
+    "d": 548,
+    "e": 579,
+    "n": "./chunks/3-legacy-4e1e80dc.js",
+    "s": 550,
+    "se": 581,
+    "ss": 540,
+  },
+  {
+    "a": -1,
+    "d": 663,
+    "e": 694,
+    "n": "./chunks/4-legacy-7e73478a.js",
+    "s": 665,
+    "se": 696,
+    "ss": 655,
+  },
+]
+`;
+
+exports[`parse import system js > svelte-legacy-part 1`] = `
+[
+  {
+    "a": -1,
+    "d": 256,
+    "e": 287,
+    "n": "./chunks/0-legacy-c5b945f8.js",
+    "s": 258,
+    "se": 290,
+    "ss": 243,
+  },
+  {
+    "a": -1,
+    "d": 406,
+    "e": 437,
+    "n": "./chunks/1-legacy-b7de93b3.js",
+    "s": 408,
+    "se": 440,
+    "ss": 393,
+  },
+  {
+    "a": -1,
+    "d": 563,
+    "e": 594,
+    "n": "./chunks/2-legacy-c3551ff3.js",
+    "s": 565,
+    "se": 597,
+    "ss": 550,
+  },
+  {
+    "a": -1,
+    "d": 719,
+    "e": 750,
+    "n": "./chunks/3-legacy-9a5e7ba5.js",
+    "s": 721,
+    "se": 753,
+    "ss": 706,
+  },
+  {
+    "a": -1,
+    "d": 876,
+    "e": 906,
+    "n": "/chunks/4-legacy-5f612355.js",
+    "s": 878,
+    "se": 909,
+    "ss": 863,
+  },
+]
+`;
+
+exports[`parse import system js > vue-legacy-part 1`] = `
+[
+  {
+    "a": -1,
+    "d": 194,
+    "e": 223,
+    "n": "./module-legacy.de1a4764.js",
+    "s": 196,
+    "se": 225,
+    "ss": 181,
+  },
+]
+`;

packages/vite/src/node/__tests__/plugins/importAnalysisBuild/utils.test.ts

@@ -0,0 +1,25 @@
+import { readFileSync } from 'node:fs'
+import { resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { describe, expect, it } from 'vitest'
+import { parseImportsSystemJS } from '../../../plugins/importAnalysisBuild'
+
+const __dirname = resolve(fileURLToPath(import.meta.url), '..')
+
+const readInputFile = (filename: string) =>
+  readFileSync(resolve(__dirname, '../../test-input/system-format', filename), {
+    encoding: 'utf8',
+    flag: 'r'
+  })
+
+const snippets = ['hello', 'svelte-legacy-part', 'vue-legacy-part', 'minified']
+
+describe('parse import system js', () => {
+  snippets.forEach((snippet) => {
+    it(snippet, () => {
+      expect(
+        parseImportsSystemJS(readInputFile(`${snippet}.js`))
+      ).toMatchSnapshot()
+    })
+  })
+})

packages/vite/src/node/__tests__/test-input/system-format/hello.js

@@ -0,0 +1,3 @@
+export function hello() {
+  return 'hello'
+}

packages/vite/src/node/__tests__/test-input/system-format/minified.js

@@ -0,0 +1,7 @@
+function bla_bla() {}
+
+System.register(["./chunks/index-legacy-60db70ad.js","./chunks/singletons-legacy-a9d19225.js"],(function(n,o){"use strict";
+
+var _t=[function(){return Z((function(){return o.import("./chunks/0-legacy-dd26244b.js")}),"__VITE_PRELOAD__",o.meta.url)},function(){return Z((function(){return o.import("./chunks/1-legacy-3bf807d6.js")}),"__VITE_PRELOAD__",o.meta.url)},function(){return Z((function(){return o.import("./chunks/2-legacy-d3251462.js")}),"__VITE_PRELOAD__",o.meta.url)},function(){return Z((function(){return o.import("./chunks/3-legacy-4e1e80dc.js")}),"__VITE_PRELOAD__",o.meta.url)},function(){return Z((function(){return o.import("./chunks/4-legacy-7e73478a.js")}),"__VITE_PRELOAD__",o.meta.url)}]
+
+}))

packages/vite/src/node/__tests__/test-input/system-format/svelte-legacy-part.js

@@ -0,0 +1,25 @@
+System.register(['./chunks/index-legacy-60db70ad.js', './chunks/singletons-legacy-4fba2acb.js'], function (exports, module) {
+  'use strict';
+
+const __vitePreload = 0
+
+var nodes = [function () {
+  return __vitePreload(function () {
+    return module.import('./chunks/0-legacy-c5b945f8.js');
+  }, "__VITE_PRELOAD__", module.meta.url);
+}, function () {
+return __vitePreload(function () { return module.import('./chunks/1-legacy-b7de93b3.js');
+  },"__VITE_PRELOAD__", module.meta.url);
+}, function () {
+  return __vitePreload(function () {  
+    return module.import("./chunks/2-legacy-c3551ff3.js");
+  }, "__VITE_PRELOAD__", module.meta.url);
+}, function () {
+  return __vitePreload(function () {
+    return module.import('./chunks/3-legacy-9a5e7ba5.js');  }, "__VITE_PRELOAD__", module.meta.url);
+}, function () {  
+  return __vitePreload(function () {
+    return module.import("/chunks/4-legacy-5f612355.js");},     "__VITE_PRELOAD__" ,   module.meta.url);
+}];
+
+})

packages/vite/src/node/__tests__/test-input/system-format/vue-legacy-part.js

@@ -0,0 +1,17 @@
+System.register([], function (exports, module) {
+  'use strict';
+
+  const _sfc_main = defineComponent({
+  components: {
+    module: defineAsyncComponent(() => __vitePreload(() => module.import('./module-legacy.de1a4764.js'), "__VITE_PRELOAD__", module.meta.url))
+  },
+
+  setup() {
+    return {
+      css
+    };
+  }
+
+});
+
+})

packages/vite/src/node/__tests__/utils.spec.ts

@@ -1,5 +1,9 @@
+import { readFileSync } from 'node:fs'
+import { resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
 import { describe, expect, test } from 'vitest'
 import {
+  analyzeSystemRegisteration,
   asyncFlatten,
   getHash,
   getLocalhostAddressIfDiffersFromDNS,
@@ -9,6 +13,21 @@ import {
   resolveHostname
 } from '../utils'
 
+const __dirname = resolve(fileURLToPath(import.meta.url), '..')
+
+const readInputFile = (filename: string) =>
+  readFileSync(resolve(__dirname, 'test-input/system-format', filename), {
+    encoding: 'utf8',
+    flag: 'r'
+  })
+
+const system_format_snippets = [
+  'hello',
+  'svelte-legacy-part',
+  'vue-legacy-part',
+  'minified'
+]
+
 describe('injectQuery', () => {
   if (isWindows) {
     // this test will work incorrectly on unix systems
@@ -177,3 +196,13 @@ describe('asyncFlatten', () => {
     expect(arr).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9])
   })
 })
+
+describe('analyzeSystemRegisteration', () => {
+  system_format_snippets.forEach((snippet) => {
+    test(snippet, () => {
+      expect(
+        analyzeSystemRegisteration(readInputFile(`${snippet}.js`))
+      ).toMatchSnapshot()
+    })
+  })
+})