使用lame转wav为mp3，报错MPEGMode is not defined

将wav格式转mp3，使用到lamejs ，npm安装，import导入后会报错MPEGMode is not defined，这时需要根据提示修改lamejs库代码

安装patch-package

yarn add --dev patch-package postinstall-postinstall

package.json文件scripts内添加命令

"scripts": {
    "postinstall": "patch-package"
  },

修改lamejs内代码

Lame.js:29行
Encoder.js:112行
PsyModel.js:162行
插入代码 var MPEGMode = require('./MPEGMode.js');

BitStream.js:33行
Presets.js:18行
插入代码  var Lame = require('./Lame.js');

QuantizePVT.js:54行
插入代码  var BitStream = require('./BitStream.js');

插入代码后，需要使用patch-package打个补丁

yarn patch-package lamejs
## 补丁完成后删除依赖重新安装依赖
rm -rf node_modules 
yarn

重启项目，包内修改内容已经全部更新，lamejs也不会报错了。若根据操作还报错，需要打开控制台查看错误信息，点入到resource里，查看标红的代码，然后将下面代码中匹配标红的错误，插入相应位置

var Lame = require('./Lame.js');
var Presets = require('./Presets.js');
var GainAnalysis = require('./GainAnalysis.js');
var QuantizePVT = require('./QuantizePVT.js');
var Quantize = require('./Quantize.js');
var Takehiro = require('./Takehiro.js');
var Reservoir = require('./Reservoir.js');
var MPEGMode = require('./MPEGMode.js');
var BitStream = require('./BitStream.js');
var Encoder = require('./Encoder.js');
var Version = require('./Version.js');
var VBRTag = require('./VBRTag.js');