webpack 替换模块算法

[noneven]

let source = `require('a');console.log(123);require('b');`
// source => AST => replaces
let replaces = [{
  from: 8,
  to: 11,
  name: 'a',
  value: 1
}, {
  from: 38,
  to: 41,
  name: 'b',
  value: 2
}];
// 期望输出
'require(/* a */1);console.log(123);require(/* b */2);'

[noneven]

let result = [source];
replaces.sort((a, b) => b.from - a.from).forEach(replace => {
    let remainSource = result.shift();
    result.unshift(
        remainSource.substr(0, replace.from),
        `/* ${replace.name} */${replace.value}`,
        remainSource.substr(replace.to)
    )
});
console.log(result.join(''));