Merge sibling variables transform

示例

输入

// 合并为一个变量声明（VariableDeclaration）
var foo = "bar";
var bar = "foo";
foobar();

// 合并到下一个循环中
var i = 0;
for (var x = 0; x < 10; x++) {}

输出

var foo = "bar",
    bar = "foo";
foobar();

for (var i = 0, x = 0; x < 10; x++) {}

npm install babel-plugin-transform-merge-sibling-variables

.babelrc

{
  "plugins": ["transform-merge-sibling-variables"]
}

babel --plugins transform-merge-sibling-variables script.js

require("babel-core").transform("code", {
  plugins: ["transform-merge-sibling-variables"]
});