'Can't start Angular application

Within the last few days, we have been encountering the following errors (and there doesn't seem to be match find in Google search):

npm start

ng serve

Compiling @angular/core : es2015 as esm2015
Error: Error on worker #1: TypeError: compiler_1.createMayBeForwardRefExpression is not a function

Any ideas why or workaround?

angularnpmsingle-page-application


Solution 1:[1]

This error is caused by the version mismatch for most Angular framework packages(like core, common, compiler) with @angular/compiler-cli and @angular/language-service.

You should always use the same versions of these packages. Try using "^" with the version number.

Solution 2:[2]

Changing the package.json dependency as below resolved the issue for me

"@angular/compiler": "12.2.13", to "@angular/compiler": "^12.2.13",

Solution 3:[3]

Try to upgrade your global typscript package

npm install -g typescript@latest

Solution 4:[4]

As @a_tk explained, that is the usual issue here.

You need edit your package.json file and search for those packages (angular) and use the caret(^) instead of tilde(~) before the package version, example:

From this:

"@angular/cli": "~12.0.1",

To this:

"@angular/cli": "^12.2.0",

Then, to avoid related issues, I recommend delete node_modules directory and package-lock.json file and run:

npm i

I hope this help others.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 a_tk
Solution 2 manoj kumar bale
Solution 3 Renjith Krishnan
Solution 4 manuelpgs

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