breaking: drop es5 suppport

Author: ije

compiler/mod.ts

@@ -22,7 +22,7 @@ export type ImportMap = {
 
 export type SWCOptions = {
   sourceType?: SourceType
-  target?: 'es5' | 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020'
+  target?: 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020'
   jsxFactory?: string
   jsxFragmentFactory?: string
 }

compiler/polyfills/es5/fetch.ts renamed to compiler/polyfills/es2015/fetch.ts

@@ -0,0 +1 @@
+import './fetch.ts'

compiler/polyfills/es2015/mod.ts

@@ -3,7 +3,6 @@ extern crate lazy_static;
 
 mod error;
 mod fast_refresh;
-mod fixer;
 mod import_map;
 mod jsx;
 mod resolve;

compiler/polyfills/es5/mod.ts

@@ -1,6 +1,5 @@
 use crate::error::{DiagnosticBuffer, ErrorBuffer};
 use crate::fast_refresh::react_refresh_fold;
-use crate::fixer::compat_fixer_fold;
 use crate::import_map::ImportHashMap;
 use crate::jsx::aleph_jsx_fold;
 use crate::resolve::Resolver;
@@ -12,9 +11,9 @@ use swc_common::{
   chain,
   comments::SingleThreadedComments,
   errors::{Handler, HandlerFlags},
-  FileName, Globals, Mark, SourceMap,
+  FileName, Globals, SourceMap,
 };
-use swc_ecma_transforms_compat::{es2015, es2016, es2017, es2018, es2020};
+use swc_ecma_transforms_compat::{es2016, es2017, es2018, es2020};
 use swc_ecma_transforms_proposal::decorators;
 use swc_ecma_transforms_typescript::strip;
 use swc_ecmascript::{
@@ -146,7 +145,6 @@ impl SWC {
       };
       let (aleph_jsx_fold, aleph_jsx_builtin_resolve_fold) =
         aleph_jsx_fold(resolver.clone(), self.source_map.clone(), options.is_dev);
-      let root_mark = Mark::fresh(Mark::root());
       let mut passes = chain!(
         Optional::new(
           resolve_fold(
@@ -193,11 +191,6 @@ impl SWC {
         Optional::new(es2018(), options.target < JscTarget::Es2018),
         Optional::new(es2017(), options.target < JscTarget::Es2017),
         Optional::new(es2016(), options.target < JscTarget::Es2016),
-        Optional::new(
-          es2015(root_mark, Default::default()),
-          options.target < JscTarget::Es2015
-        ),
-        Optional::new(compat_fixer_fold(), options.target < JscTarget::Es2015),
         Optional::new(
           helpers::inject_helpers(),
           options.target < JscTarget::Es2020

compiler/polyfills/es5/regenerator-runtime.ts

@@ -9,7 +9,7 @@ import { getAlephPkgUri, reLocaleID } from './helper.ts'
 
 export const defaultConfig: Readonly<Required<Config>> = {
   framework: 'react',
-  buildTarget: 'es5',
+  buildTarget: 'es2015',
   baseUrl: '/',
   srcDir: '/',
   outputDir: '/dist',
@@ -157,9 +157,8 @@ function isFramework(v: any): v is 'react' {
   }
 }
 
-function isBuildTarget(v: any): v is 'es5' | 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020' {
+function isBuildTarget(v: any): v is 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020' {
   switch (v) {
-    case 'es5':
     case 'es2015':
     case 'es2016':
     case 'es2017':

compiler/src/fixer.rs

@@ -58,8 +58,8 @@ export type Plugin = LoaderPlugin | ServerPlugin
 export type Config = {
   /** `framework` specifies the framework (default is 'react'). */
   framework?: 'react'
-  /** `buildTarget` specifies the build target in production mode (default is **es5** to be compatible with IE11). */
-  buildTarget?: 'es5' | 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020'
+  /** `buildTarget` specifies the build target in production mode (default is **es2015**). */
+  buildTarget?: 'es2015' | 'es2016' | 'es2017' | 'es2018' | 'es2019' | 'es2020'
   /** `baseUrl` specifies the path prefix for the application (default is '/'). */
   baseUrl?: string
   /** `srcDir` specifies the **src** dir (default is '/'). */