babel-plugin-external-helpers について - 備忘録β版
rollup の babel 用プラグインである rollup-plugin-babel の README に， npm install --save-dev babel-preset-es2015 babel-plugin-external-helpers という記載があります． babel-preset-es2015 はよく目にしますが，babel-plugin-external-helpers は初めて見たため，どういうものか調べてみました． babel-plugin-external-helpers babel-plugin-external-helpers は，babel での変換時に各ファイルごとに出力される共通コードを，グローバル変数を用いて1つにまとめることで，重複するコード出力を削減するプラグインです． 以下の2つのファイルを babel で変換する場合を例として，出力の
GitHub - tkh44/babel-plugin-sitrep: Log all assignments and the return value of a function with a simple comment
// sitrep function bar () { console.groupCollapsed('bar'); var a = 'foo'; console.log('a: ', a); const b = 'bar'; console.log('b: ', b); let c = [a, b].map(x => x); console.log('c: ', c); var _returnValue = c.join('-'); console.log('Return Value:', _returnValue); console.groupEnd('bar'); return _returnValue; } // sitrep var cb = function (x) { console.groupCollapsed('cb'); var _returnValue3 = x.ch
@babel/plugin-transform-class-properties · Babel
Example Below is a class with four class properties which will be transformed. class Bork { //Property initializer syntax instanceProperty = "bork"; boundFunction = () => { return this.instanceProperty; }; //Static class properties static staticProperty = "babelIsCool"; static staticFunction = function() { return Bork.staticProperty; }; } let myBork = new Bork(); //Property initializers are not o
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