Angular：发生未处理的异常：找不到模块“webpack/lib/ParserHelpers”

Question

I want to do an upgrade from Angular 7 to 8. I have installed @angular-devkit/build-angular@0.800.0, uninstalled et reinstalled node modules, but I always got this problem : Cannot find module 'webpack/lib/ParserHelpers' When I did npm fix audit I got another type of error which is : An unhandled exception occurred: Job name "..getProjectMetadata" does not exist. See "C:\\Users\\Surface\\AppData\\Local\\Temp\\ng-urmmUP\\angular-errors.log" for further details.

Answer 1

First of all, make sure that NPM is up-to-date.

npm i -g npm

Check version of Webpack. The version 5 (and after) is not currently supported by @angular-devkit/build-angular@0.8XX.X ( source ).

Clean all :

remove node_modules folder and package-lock.json file

rm package-lock.json && rm -R node_modules

remove dist folder

Clear npm cache :

npm cache clean --force

To see which version are installed :

npm ls webpack

How to resolve ?

npm uninstall webpack
npm install --save-dev webpack@4.39.2

Answer 2

In my case it has been solved

1. npm audit fix / sudo npm audit fix (ubuntu)

2. Adding the following code in tsconfig.json "angularCompilerOptions": { "enableIvy": false }

Answer 3

you can use npm ci

description

Answer 4

你应该在 Package-lock.json 和 package.json 中检查你的 webpack 版本