'Proxy' is undefined in IE

问题

I have built an Excel add-in by React+Node+Umi. We have implemented our authentication system. The authentication works in Chrome and Safari, I just realized that it does not work well in IE11; F12 shows that 'Proxy' is undefined.

Although it is an Excel add-in, we could reproduce the error (and the same error message) just in browser. Open the link https://jsaddin.10studio.tech/welcome/?next=formulaEditor in IE 11, sign in with ID 3094557608@qq.com and password: 123456. We could see the error message in F12.

Does anyone know

how to fix this?
how could I know which library/part of my code uses this Proxy? I may replace it by alternatives.

Edit 1: In .umirc.ts:

treeShaking: true,
targets: {
  ie: 9,
  safari: 9,
},

In package.json:

"umi": "^2.7.0",
"umi-plugin-react": "^1.8.0",
"umi-types": "^0.2.0"

Edit 2:

I tried yarn add proxy-polyfill, then yarn start. Curiously, it raised an error in localhost Invalid character and 'umi' is undefined:

回答1:

It looks like you are missing a polyfill. Did you check this config for umi.js? https://umijs.org/config/#targets

Setting the target of ie to 11 (as in the above link) should handle adding the polyfills you need.

  targets: {
    ie: 11,
    ...other browsers
  },
  ...rest of the config

LE:

In case there is an issue with umi.js you can try adding the needed polyfills yourself (e.g. here is one for Proxy https://github.com/GoogleChrome/proxy-polyfill)

来源：https://stackoverflow.com/questions/60348709/proxy-is-undefined-in-ie

标签

node.js

reactjs

express

cross-browser

umijs