New option to skip all variants

index.ts

@@ -179,27 +179,35 @@ export class Scenarios {
    *     with name name of the base scenario: <base>-<derived>.
    * @returns a new `Scenarios` instance with the given scenario removed.
    */
-  skip(variantName: string): Scenarios {
+  skip(): Scenarios;
+  skip(variantName: string): Scenarios;
+  skip(variantName?: string): Scenarios {
     if (this.state.type === 'root') {
-      throw new Error(`no variant named ${variantName} available to skip on root scenario`);
-    }
-    if (!this.state.variants[variantName]) {
-      throw new Error(
-        `no variant named ${variantName} available to skip. Found variants: ${Object.keys(
-          this.state.variants
-        ).join(', ')}`
-      );
+      throw new Error('cannot call skip() on root scenarios');
     }
+
     let variants = Object.assign({}, this.state.variants);
-    variants[variantName].status = 'skipped';
+    if (variantName) {
+      if (!this.state.variants[variantName]) {
+        throw new Error(
+          `no variant named ${variantName} available to skip. Found variants: ${Object.keys(
+            this.state.variants
+          ).join(', ')}`
+        );
+      }
+      variants[variantName].status = 'skipped';
+    } else {
+      for (let variant of Object.values(variants)) {
+        variant.status = 'skipped';
+      }
+    }
     return new Scenarios({
       type: 'derived',
       parent: this.state.parent,
       variants,
     });
   }
 
-
   /**
    * @param variantName - name of scenario to keep. Note: names of derived scenarios are prepended
    *     with name name of the base scenario: <base>-<derived>.

tests/test.ts

@@ -72,6 +72,15 @@ ok 1 project > createHello
   });
 });
 
+const skipExpandedExample = Scenarios.fromProject(() => new Project());
+skipExpandedExample
+  .expand({
+    'child-one-of-other-root': () => {},
+    'child-two-of-other-root': () => {},
+  }).skip().map('inner', () => {}) // skip with no arguments skips all variants
+  .forEachScenario(() => {});
+
+
 Qunit.module('cli', () => {
   Qunit.test('list', async (assert) => {
     const result = await execa('node', ['./dist/cli.js', 'list',  '--require', 'ts-node/register', '--files', './tests/test.ts', '--matrix'])