How to downgrade angular7 to angular6
You need to set the version numbers in your package.json
for (at least) this packages
"@angular/animations": "^7.0.0",
"@angular/cdk": "7.3.3",
"@angular/common": "^7.0.0",
"@angular/compiler": "7.2.6",
"@angular/core": "7.2.6",
"@angular/forms": "^7.0.0",
"@angular/http": "^7.0.0",
"@angular/material": "7.3.3",
"@angular/material-moment-adapter": "^7.3.3",
"@angular/platform-browser": "^7.0.0",
"@angular/platform-browser-dynamic": "^7.0.0",
"@angular/router": "^7.0.0",
"rxjs": "6.4.0",
as well as in dev-dependencies
"@angular/compiler-cli": "^7.2.6",
"@angular-devkit/build-angular": "0.13.3",
"typescript": "3.2.4",
"@angular/cli": "~7.3.3",
Also make sure to downgrade every library that needs to be downgraded depending on angular's version. Check error messages after step 1...
Once you changed that, run
rm -rf node_modules
from the project's root folder to remove all packages
Then run
npm i
And you should be good to go