Certain modifier tags no longer included in json output since v0.25

[ben-polinsky]

Expected Behavior

@alpha tags (tested @beta and @experimental tags with the same result) used to document types should be available in the modifierTags array of the corresponding node in json output produced by TypeDoc.

Actual Behavior

Since version 0.25, the above behavior is no longer the case.

Steps to reproduce the bug

Consider the following:

/**
 * No issues here, correctly has `@alpha` in modifierTags
 * (behavior is the same with beta or experimental tags)
 * @alpha
 */
export type AlphaOk = number | string;

/**
 * Now, no `@alpha`
 * (behavior is the same with beta or experimental tags)
 * @alpha
 */
export type AlphaNoGo = (arg: number | string) => void;

Will produce the following output in versions <0.26:
stackblitz link run npm run docs

	"id": 2,
	"name": "AlphaNoGo",
	"variant": "declaration",
	"kind": 2097152,
	"flags": {},
	"comment": {
		"summary": [
			{
				"kind": "text",
				"text": "Now, no "
			},
			{
				"kind": "code",
				"text": "`@alpha`"
			},
			{
				"kind": "text",
				"text": "\n(behavior is the same with beta or experimental tags)"
			}
		],
		"modifierTags": [
			"@alpha"
		]
	},

But the following output in versions >=0.26
stackblitz link run npm run docs

   "id": 2,
  "name": "AlphaNoGo",
  "variant": "declaration",
  "kind": 2097152,
  "flags": {},
  "comment": {
  "summary": [
	  {
		  "kind": "text",
		  "text": "Now, no "
	  },
	  {
		  "kind": "code",
		  "text": "`@alpha`"
	  },
	  {
		  "kind": "text",
		  "text": "\n(behavior is the same with beta or experimental tags)"
	  }
  ]
  },

Environment

• Typedoc version: Tested failures with 0.26.0; 0.26.11; and 0.27.2
• TypeScript version: various 5.x
• Node.js version: 22; 20
• OS: Mac; Ubuntu

[Gerrit0]

Those tags are all modifier tags, so shouldn't appear in the blockTags array. They appear under the modifierTags property. https://typedoc.org/documents/Tags.html#modifier-tags

[ben-polinsky]

Apologies. But the tags are nowhere - they aren't in any modifierTags property as you can see from my example and reproduction.

[ben-polinsky]

The issue is with this commit which adds "cascading" modifierTags. If I remove the default modifierTags and specify an empty array in config, then all is well.

I have a workaround, but this does seem like a bug.

[Gerrit0]

Ah shoot, yes, this is a bug. Cascading tags shouldn't recurse into types, which is what's happening here.