babel按需引入lodash插件
使用说明
step 1: 安装 babel-plugin-lodash-demand-import
npm i babel-plugin-lodash-demand-import --save-dev step 2: 配置 babel-plugin-lodash-demand-import
{
"plugins": ["babel-plugin-lodash-demand-import"]
}
或者：
./node_modules/.bin/babel src --out-dir lib --plugins babel-plugin-lodash-demand-import 即可
源码如下：
module.exports = ({ types: t }) => {
return {
visitor: {
ImportDeclaration(path, state) {
if (path.get('source').isStringLiteral() && path.get('source').node.value === 'lodash') {
const variableSpecifiers = path.get('specifiers');
if (variableSpecifiers.length > 0) {
variableSpecifiers.map(item => {
if (item.node.type !== 'ImportDefaultSpecifier') {
const importDefaultSpecifier = [
t.ImportDefaultSpecifier(t.Identifier(item.node.local.name)),
];
const importDeclaration = t.ImportDeclaration(
importDefaultSpecifier,
t.StringLiteral(`lodash/${item.node.local.name}`)
);
path.parentPath.get('body')[0].insertBefore(importDeclaration)
}
})
path.remove();
}
}
}
}
}
}