Angular 9 + CLI (TypeScript) - How to stop generating .spec.ts test files

I know it's kind of a bad practice, but bear with me:

I'm using Angular-CLI, particularly ng g to generate all of my classes. However, I'm not interested in any *.spec.ts test files. I know that there are two flags (--inline-template, --inline-style) to handle inline CSS and HTML instead of separated files, and for spec the --spec flag is set to true by default.

So for each run, yes, I could do ng g c foo --it --is --spec=false.

But how do I disable the creation of test files globally? Is there any default setting for it?

Rashly, I did some stuff (that didn't work), like:

ng set spec=false --global

I also tried configuring my src/tsconfig.json by filling the exclude array:

"exclude": [
    "**/*.spec.ts"
]

For Angular 9 > (version 6 > below)

1) Copy snippet to the root of angular.json, (configures settings to all projects/globally).
2) Or copy snippet to the root of a specific project (projects.your-project-name) in angular.json (configures settings for a specific project).

"schematics": {
  "@schematics/angular:component": {
    "style": "scss",
    "skipTests": true
  },
  "@schematics/angular:class": {
    "skipTests": true
  },
  "@schematics/angular:directive": {
    "skipTests": true
  },
  "@schematics/angular:pipe": {
    "skipTests": true
  },
  "@schematics/angular:service": {
    "skipTests": true
  }
},

All configurable options per type of file Schematic Options:

"schematics": {
  "@schematics/angular:component": {
    "changeDetection": "Default",
    "entryComponent": false,
    "export": false,
    "flat": false,
    "inlineStyle": false,
    "inlineTemplate": false,
    "module": "",
    "prefix": "",
    "selector": "",
    "skipImport": false,
    "spec": true,
    "style": "css",
    "viewEncapsulation": "Emulated",
    "skipTests": "false"
  },
  "@schematics/angular:module": {
    "commonModule": true,
    "flat": false,
    "module": "",
    "routing": false,
    "routingScope": "Child"
  },
  "@schematics/angular:service": {
    "flat": true,
    "skipTests": true
  },
  "@schematics/angular:pipe": {
    "export": false,
    "flat": true,
    "module": "",
    "skipImport": false,
    "skipTests": true
  },
  "@schematics/angular:directive": {
    "export": false,
    "flat": true,
    "module": "",
    "prefix": "app",
    "selector": "",
    "skipImport": false,
    "skipTests": true
  },
  "@schematics/angular:class": {
    "skipTests": true
  }
},

For Angular 6 >

1) Copy snippet to the root of angular.json, (configures settings to all projects/globally).
2) Or copy snippet to the root of a specific project (projects.your-project-name) in angular.json (configures settings for a specific project).

"schematics": {
  "@schematics/angular:component": {
    "styleext": "scss",
    "spec": false
  },
  "@schematics/angular:class": {
    "spec": false
  },
  "@schematics/angular:directive": {
    "spec": false
  },
  "@schematics/angular:guard": {
    "spec": false
  },
  "@schematics/angular:module": {
    "spec": false
  },
  "@schematics/angular:pipe": {
    "spec": false
  },
  "@schematics/angular:service": {
    "spec": false
  }
},

All configurable options per type of file (Schematic Options):

"schematics": {
  "@schematics/angular:component": {
    "changeDetection": "Default",
    "export": false,
    "flat": false,
    "inlineStyle": false,
    "inlineTemplate": false,
    "module": "",
    "prefix": "",
    "selector": "",
    "skipImport": false,
    "spec": true,
    "styleext": "css",
    "viewEncapsulation": "Emulated"
  },
  "@schematics/angular:module": {
    "commonModule": true,
    "flat": false,
    "module": "",
    "routing": false,
    "routingScope": "Child",
    "spec": true
  },
  "@schematics/angular:service": {
    "flat": true,
    "spec": true
  },
  "@schematics/angular:pipe": {
    "export": false,
    "flat": true,
    "module": "",
    "skipImport": false,
    "spec": true
  },
  "@schematics/angular:directive": {
    "export": false,
    "flat": true,
    "module": "",
    "prefix": "app",
    "selector": "",
    "skipImport": false,
    "spec": true
  },
  "@schematics/angular:class": {
    "spec": true
  }
},

Angular CLI configuration with Angular CLI

ERROR:

The ng set defaults.spec.component false command results in the error: get/set have been deprecated in favor of the config command.

ng set got changed to ng config.

Using the Angular CLI (config command usage):

The settings for generating specs, inline templates, inline styling etc. within angular.json are now persisted inside the schematics.@schematics/angular.<file-type>.<setting>.

Run ng config schematics.@schematics/angular.component.spec false to configure spec for components. This command adds the setting inside the schematics property within the angular.json file.

Angular CLI workspace file (angular.json) on Angular Github

Schematic options inside schema.json

How to do X in Angular CLI v6

If you're using v6 and need to edit your angular.json

You can edit the schematics for your project.

"schematics": {
    "@schematics/angular:component": {
      "styleext": "scss",
      "spec": false
    },
    "@schematics/angular:class": {
      "spec": false
    },
    "@schematics/angular:directive": {
      "spec": false
    },
    "@schematics/angular:guard": {
      "spec": false
    },
    "@schematics/angular:module": {
      "spec": false
    },
    "@schematics/angular:pipe": {
      "spec": false
    },
    "@schematics/angular:service": {
      "spec": false
    }
  },

You can run this command to disable spec file generation for a specific type of file:

ng set defaults.spec.FILETYPE false

For example:

ng set defaults.spec.component false // Won't generate spec files for .component files

Alternately you can just disable all spec file generation from the angular-cli.json file.

{
  ...
  "defaults": {
    "spec": {
      "class": false,
      "component": false,
      "directive": false,
      "module": false,
      "pipe": false,
      "service": false
    }
  }
}

Just to update Sabbir Rahman's answer:

In version 1.0.2 of the CLI you will have to set the spec file to false for each individual type. An example is included below:

"defaults": {
    "styleExt": "scss",
    "component": {
      "spec": false
    },
    "service": {
      "spec": false
    },
    "directive": {
      "spec": false
    },
    "class": {
      "spec": false // Set to false by default
    },
    "module": {
      "spec": false // Set to false by default
    },
    "pipe": {
      "spec": false
    }
  }