| 5 | |
| 6 | class TransformVarToLetPlugin { |
| 7 | apply (compiler) { |
| 8 | compiler.hooks.emit.tap(pluginName, compilation => { |
| 9 | Object.keys(compilation.assets).forEach(item => { |
| 10 | // .source() 是获取构建产物的文本 |
| 11 | // .assets 中包含构建产物的文件名 |
| 12 | let content = compilation.assets[item].source() |
| 13 | let ast = $(content).replace('var $_$1 = $_$2', 'let $_$1 = $_$2') |
| 14 | content = ast.generate() |
| 15 | // 更新构建产物对象 |
| 16 | compilation.assets[item] = { |
| 17 | source: () => content, |
| 18 | size: () => content.length, |
| 19 | } |
| 20 | }) |
| 21 | }) |
| 22 | } |
| 23 | } |
| 24 | |
| 25 | module.exports = TransformVarToLetPlugin |