Add es2021 polyfill

Author: ije

bundler/mod.ts

@@ -76,7 +76,9 @@ export class Bundler {
       }
     })
 
-    await this.bundlePolyfillChunck()
+    if (this.#app.config.buildTarget !== 'esnext') {
+      await this.bundlePolyfillChunck()
+    }
     await this.bundleChunk(
       'deps',
       Array.from(remoteEntries),
@@ -203,11 +205,12 @@ export class Bundler {
   private async bundlePolyfillChunck() {
     const alephPkgUri = getAlephPkgUri()
     const { buildTarget } = this.#app.config
-    const hash = computeHash(buildTarget + Deno.version.deno + VERSION)
+    const polyfillTarget = 'es' + (parseInt(buildTarget.slice(2)) + 1)
+    const hash = computeHash(polyfillTarget + '/[email protected]/' + VERSION)
     const bundleFilename = `polyfill.bundle.${hash.slice(0, hashShort)}.js`
     const bundleFilePath = join(this.#app.buildDir, bundleFilename)
     if (!existsFileSync(bundleFilePath)) {
-      const rawPolyfillFile = `${alephPkgUri}/bundler/polyfills/${buildTarget}/mod.ts`
+      const rawPolyfillFile = `${alephPkgUri}/bundler/polyfills/${polyfillTarget}/mod.ts`
       await this.build(rawPolyfillFile, bundleFilePath)
     }
     this.#bundledFiles.set('polyfill', bundleFilename)

bundler/polyfills/es2015/mod.ts

@@ -1,10 +1,15 @@
 import flatShim from 'https://esm.sh/array.prototype.flat/shim'
-import flatmapShim from 'https://esm.sh/array.prototype.flatmap/shim'
+import flatMapShim from 'https://esm.sh/array.prototype.flatmap/shim'
 import descriptionShim from 'https://esm.sh/symbol.prototype.description/shim'
-import fromentriesShim from 'https://esm.sh/object.fromentries/shim'
+import fromEntriesShim from 'https://esm.sh/object.fromentries/shim'
+import trimStartShim from 'https://esm.sh/string.prototype.trimstart/shim'
+import trimEndShim from 'https://esm.sh/string.prototype.trimend/shim'
+
 import '../es2020/mod.ts'
 
 flatShim()
-flatmapShim()
+flatMapShim()
 descriptionShim()
-fromentriesShim()
+fromEntriesShim()
+trimStartShim()
+trimEndShim()

bundler/polyfills/es2019/mod.ts

@@ -1,6 +1,7 @@
 import matchallShim from 'https://esm.sh/string.prototype.matchall/shim'
 import globalthisShim from 'https://esm.sh/globalthis/shim'
 import allsettledShim from 'https://esm.sh/promise.allsettled/shim'
+import '../es2021/mod.ts'
 
 matchallShim()
 globalthisShim()

bundler/polyfills/es2020/mod.ts

@@ -0,0 +1,3 @@
+import replaceAllShim from 'https://esm.sh/string.prototype.replaceall/shim'
+
+replaceAllShim()

bundler/polyfills/es2021/mod.ts

@@ -222,14 +222,15 @@ function isFramework(v: any): v is 'react' {
   }
 }
 
-function isBuildTarget(v: any): v is 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020' {
+function isBuildTarget(v: any): v is 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020' | 'esnext' {
   switch (v) {
     case 'es2015':
     case 'es2016':
     case 'es2017':
     case 'es2018':
     case 'es2019':
     case 'es2020':
+    case 'esnext':
       return true
     default:
       return false

server/config.ts

@@ -51,7 +51,7 @@ export type ServerPlugin = {
 
 export type PostCSSPlugin = string | [string, any] | Plugin | PluginCreator<any>
 
-export type BuildTarget = 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020'
+export type BuildTarget = 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020' | 'esnext'
 
 export type BrowserTarget = {
   name: 'chrome' | 'edge' | 'firefox' | 'ios' | 'Safari'