node_modules不能加载包之间的依赖

[zdxxxxxx]

fis3 release 报warn
Can't resolve xhr2 in file [/node_modules/reqwest/reqwest.js], did you miss npm install xhr2?

$ ls
antd/ less/
babel-plugin-import/ material-ui/
babel-preset-es2015/ process/
babel-preset-react/ react/
babel-preset-stage-3/ react-dom/
classnames/ react-redux/
fis3-hook-commonjs/ react-router/
fis3-hook-node_modules/ react-tap-event-plugin/
fis3-packager-deps-pack/ redux/
fis3-parser-less-2.x/ redux-thunk/
fis3-postpackager-loader/ reqwest/
fis3-preprocessor-js-require-css/ xhr2/
fis-parser-babel-6.x/

xhr2这个包是有的

reqwest.js的一段引用xhr2的源码

try {
XHR2 = require('xhr2')
} catch (ex) {
throw new Error('Peer dependency xhr2 required! Please npm install xhr2')
}