In angular-cli.json under defaults add:

"spec": {
  "class": [true/false],
  "component": [true/false],
  "directive": [true/false],
  "module": [true/false],
  "pipe": [true/false],
  "service": [true/false]}

When generating blueprints the precedence will be:

• command-line option value if specified
• value in configuration file
• current default value for each blueprint specified to maintain current functionality