Serialize NullToken as null

actions-workflow-parser/src/templates/tokens/null-token.ts

@@ -23,6 +23,6 @@ export class NullToken extends LiteralToken {
   }
 
   public override toJSON() {
-    return "null";
+    return null;
   }
 }

actions-workflow-parser/src/templates/tokens/serialization.ts

@@ -29,4 +29,5 @@ export type SerializedToken =
   | string
   | number
   | boolean
+  | null
   | undefined;

actions-workflow-parser/testdata/reader/reusable-workflow-job-basic.yml

@@ -1,7 +1,6 @@
 include-source: false # Drop file/line/col from output
 skip:
   - Go
-  - TypeScript
 ---
 on: push
 jobs:

actions-workflow-parser/testdata/reader/reusable-workflow-secrets-secret-without-definition.yml

@@ -1,7 +1,6 @@
 include-source: false # Drop file/line/col from output
 skip:
   - Go
-  - TypeScript
 ---
 on: push
 jobs:

actions-workflow-parser/testdata/reader/yaml-schema-null.yml

@@ -1,6 +1,4 @@
 include-source: false # Drop file/line/col from output
-skip:
-  - TypeScript
 ---
 on: push
 jobs: