feat: improve minification for --target es5

[Nikaple]

Given command below:

tsup ./test.ts --minify --format iife --target es5 --globalName test

Before PR, result was:

function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor)){throw new TypeError("Cannot call a class as a function")}}function _defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value"in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor)}}function _createClass(Constructor,protoProps,staticProps){if(protoProps)_defineProperties(Constructor.prototype,protoProps);if(staticProps)_defineProperties(Constructor,staticProps);return Constructor}var test=function(){var s=Object.defineProperty;var t=Object.getOwnPropertyDescriptor;var d=Object.getOwnPropertyNames;var f=Object.prototype.hasOwnProperty;var g=function(l){return s(l,"__esModule",{value:!0})};var h=function(l,o){for(var a in o)s(l,a,{get:o[a],enumerable:!0})},n=function(l,o,a,c){var _iteratorNormalCompletion=true,_didIteratorError=false,_iteratorError=undefined;if(o&& typeof o=="object"|| typeof o=="function")try{var _loop=function(_iterator,_step){var e=_step.value;!f.call(l,e)&&(a||e!=="default")&&s(l,e,{get:function(){return o[e]},enumerable:!(c=t(o,e))||c.enumerable})};for(var _iterator=d(o)[Symbol.iterator](),_step;!(_iteratorNormalCompletion=(_step=_iterator.next()).done);_iteratorNormalCompletion=true)_loop(_iterator,_step)}catch(err){_didIteratorError=true;_iteratorError=err}finally{try{if(!_iteratorNormalCompletion&&_iterator.return!=null){_iterator.return()}}finally{if(_didIteratorError){throw _iteratorError}}}return l};var p=function(l){return function(o,a){return l&&l.get(o)||(a=n(g({}),o,1),l&&l.set(o,a),a)}}(typeof WeakMap!="undefined"?new WeakMap:0);var r={};h(r,{Foo:function(){return i}});var i=function(){"use strict";function _class(){_classCallCheck(this,_class)}_createClass(_class,[{key:"hi",value:function hi(){console.log(function(){return"foo"}())}}]);return _class}();return p(r)}()

After PR, result will be:

function a(a,b){if(!(a instanceof b)){throw new TypeError("Cannot call a class as a function")}}function b(a,b){for(var c=0;c<b.length;c++){var d=b[c];d.enumerable=d.enumerable||false;d.configurable=true;if("value"in d)d.writable=true;Object.defineProperty(a,d.key,d)}}function c(a,c,d){if(c)b(a.prototype,c);if(d)b(a,d);return a}var test=function(){var b=Object.defineProperty;var d=Object.getOwnPropertyDescriptor;var e=Object.getOwnPropertyNames;var f=Object.prototype.hasOwnProperty;var g=function(a){return b(a,"__esModule",{value:!0})};var h=function(a,c){for(var d in c)b(a,d,{get:c[d],enumerable:!0})},i=function(a,c,g,h){var i=true,j=false,k=undefined;if(c&& typeof c=="object"|| typeof c=="function")try{var l=function(m,n){var e=n.value;!f.call(a,e)&&(g||e!=="default")&&b(a,e,{get:function(){return c[e]},enumerable:!(h=d(c,e))||h.enumerable})};for(var m=e(c)[Symbol.iterator](),n;!(i=(n=m.next()).done);i=true)l(m,n)}catch(o){j=true;k=o}finally{try{if(!i&&m.return!=null){m.return()}}finally{if(j){throw k}}}return a};var j=function(a){return function(b,c){return a&&a.get(b)||(c=i(g({}),b,1),a&&a.set(b,c),c)}}(typeof WeakMap!="undefined"?new WeakMap:0);var k={};h(k,{Foo:function(){return l}});var l=function(){"use strict";function b(){a(this,b)}c(b,[{key:"hi",value:function a(){console.log(function(){return"foo"}())}}]);return b}();return j(k)}()

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Name	Status	Preview	Updated
tsup	✅ Ready (Inspect)	Visit Preview	Jul 25, 2022 at 2:55PM (UTC)

[Nikaple]

After upgrading @swc/core, Reflect.metadata changes to __metadata

[Nikaple]

@swc/core is upgraded to ensure correct typing for swc.transform

[github-actions]

🎉 This PR is included in version 6.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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