Cannot assign to read only property 'exports' of object '#<Object>'

[VictorWu90]

• Operating System:macOS Mojave 10.14.4
• Node Version:v9.11.1
• NPM Version:6.9.0
• webpack Version:4.33.0
• webpack-dev-server Version:3.7.1

dev doesn't work.The info is:
Uncaught TypeError: Cannot assign to read only property 'exports' of object '#'
at Module. (SockJSClient.js:28)
at Module../node_modules/webpack-dev-server/client/clients/SockJSClient.js (SockJSClient.js:69)
at webpack_require (bootstrap:783)
at fn (bootstrap:143)
at Object../node_modules/webpack-dev-server/client/socket.js (socket.js:45)
at webpack_require (bootstrap:783)
at fn (bootstrap:143)
at Module. (index.js:8)
at Module../node_modules/webpack-dev-server/client/index.js?http://localhost:8082 (index.js:176)
at webpack_require (bootstrap:783)

It goes well when I change the webpack-dev-server version to 3.5.1

[hiroppy]

Please submit the reproducible repo.

[alexander-akait]

I think problem on minimizer side, you should disable minimizer when you in development mode, also looks you use old uglify-js version and plugin

[VictorWu90]

I disable minimizer when in development mode, and so that It's not about the uglify-js.

I think problem on minimizer side, you should disable minimizer when you in development mode, also looks you use old uglify-js version and plugin

[VictorWu90]

module.exports =
/#PURE/
function (_BaseClient) {
_inherits(SockJSClient, _BaseClient);

function SockJSClient(url) {
var _this;

_classCallCheck(this, SockJSClient);

_this = _possibleConstructorReturn(this, _getPrototypeOf(SockJSClient).call(this));
_this.sock = new SockJS(url);
return _this;

}

_createClass(SockJSClient, [{
key: "onOpen",
value: function onOpen(f) {
this.sock.onopen = f;
}
}, {
key: "onClose",
value: function onClose(f) {
this.sock.onclose = f;
} // call f with the message string as the first argument

}, {
key: "onMessage",
value: function onMessage(f) {
this.sock.onmessage = function (e) {
f(e.data);
};
}
}], [{
key: "getClientPath",
value: function getClientPath(options) {
return require.resolve('./SockJSClient');
}
}]);

return SockJSClient;
}(BaseClient);

It's the info in console.

[alexander-akait]

Please create minimum reproducible test repo

[alexander-akait]

Closing due to inactivity. Please test with latest version and feel free to reopen if still regressions. Thanks!

[ghost]

S:\express my project\node_modules\mongoose\lib\connection.js:62
this.plugins = [];
^

TypeError: Cannot assign to read only property 'plugins' of object '#'
at Mongoose.Connection (S:\express my project\node_modules\mongoose\lib\connection.js:62:16)
at Mongoose.NativeConnection [as Connection] (S:\express my project\node_modules\mongoose\lib\drivers\node-mongodb-native\connection.js:18:22)
at Object. (S:\express my project\vchamp.js:14:10)
at Module._compile (internal/modules/cjs/loader.js:776:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:829:12)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
[nodemon] app crashed - waiting for file changes before starting...

this problem solution

[yikuo123]

I encountered the same problem. I found that if compiling webpack-dev-server with babel7, this would occur.

[GoldSubmarine]

use webpack-dev-server@3.5.1 instead of 3.9.0 solved the problem

[StepanovMax]

use webpack-dev-server@3.5.1 instead of 3.9.0 solved the problem

It didn't help me.