The exception: Could Not Find Module “@angular-devkit/build-angular” is very popular. Google on the web, one can get tons of results of questions and answers. This article will give a fix to this Angular exception, and discuss a little bit about the reason and other possible solutions.
A: Process
Step 1
We need to run an Angular program, the computer has the current version of Angular installed,
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Step 2
Change to app folder, build failed,
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Step 3
We are suggested, the original Angular program was written by Version 6, then we switched back to Angular v 6.0.8.
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Step 4
Re-run the program, we still get the error: Could Not Find Module “@angular-devkit/build-angular”.
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Step 5
We run the fix - npm install --save-dev @angular-devkit/build-angular.
install @angular-devkit/build-angular
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Step 6
After the fix, the Angular version became 8.3.26.
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Step 7
Build --- successful!
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Step 8
Run --- successful!
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B: Possible Reason for the exception
We do not know exactly the reason for the exception, but one suggested,
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It could be true although we did not do a thorough test, the computer we got the problem did involve TFS, Git process, while other computers when installing Git installation, the Angular program became weird. I believe, or assume, involving TFS or Git processes could be a reason affecting Angular working properly.
C: Other Solutions for this Exception
Our fix for the issue is to run MPM install locally to install the missing components, "@angular-devkit/build-angular". Another approach is to check Angular global installation, if "@angular-devkit/build-angular" exists, and then check the package.json file, see if the component is in the “DevDependencies” and “dependencies” blocks; if not, add
"@angular-devkit/build-angular":"^0.13.9", into the “devDependencies” block.
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You may check the Angular packages installation globally by,
npm list -g depth=1
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This solution could be found in this article.
Summary
This article is a fix of a popular Angular exception.
References
We can see tons of articles discussion online about this exception, we quote several here,