You have to be inside an angular-cli project in order to use the build command after reinstall of angular-cli

Same as John Pankowicz answer, but in my case I had to run

npm install -g @angular/cli@latest

for the versions to match.

npm uninstall -g angular-cli @angular/cli
npm cache clean
npm install -g @angular/cli

use sudo on Mac/Linux.

Ok, found it.

package.json must contain a dependency to angular-cli.

When I uninstalled my local angular-cli, npm also removed the dependency entry.

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