data: inputThingClass -> isThingClass, use global Thing symbols

6 files changed, 38 insertions, 57 deletions

diff --git a/src/data/composite/wiki-data/index.js b/src/data/composite/wiki-data/index.js
index d64930e1..3ccfa75d 100644
--- a/src/data/composite/wiki-data/index.js
+++ b/src/data/composite/wiki-data/index.js
@@ -5,7 +5,6 @@
 //
 
 export {default as exitWithoutContribs} from './exitWithoutContribs.js';
-export {default as inputThingClass} from './inputThingClass.js';
 export {default as inputWikiData} from './inputWikiData.js';
 export {default as withParsedCommentaryEntries} from './withParsedCommentaryEntries.js';
 export {default as withResolvedContribs} from './withResolvedContribs.js';
diff --git a/src/data/composite/wiki-data/inputThingClass.js b/src/data/composite/wiki-data/inputThingClass.js
deleted file mode 100644
index 5f2ca5a6..00000000
--- a/src/data/composite/wiki-data/inputThingClass.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// Please note that this input, used in a variety of #composite/wiki-data
-// utilities, is basically always a kludge. Any usage of it depends on
-// referencing Thing class values defined outside of the #composite folder.
-
-import {input} from '#composite';
-import {isFunction} from '#validators';
-
-// TODO: Kludge.
-import Thing from '../../things/thing.js';
-
-export default function inputThingClass() {
-  return input.staticValue({
-    validate(thingClass) {
-      isFunction(thingClass);
-
-      if (!Object.hasOwn(thingClass, Thing.referenceType)) {
-        throw new TypeError(`Expected a Thing constructor, missing Thing.referenceType`);
-      }
-
-      return true;
-    },
-  });
-}
diff --git a/src/data/composite/wiki-properties/referenceList.js b/src/data/composite/wiki-properties/referenceList.js
index f5b6c58e..af634a68 100644
--- a/src/data/composite/wiki-properties/referenceList.js
+++ b/src/data/composite/wiki-properties/referenceList.js
@@ -7,14 +7,10 @@
 //
 
 import {input, templateCompositeFrom} from '#composite';
-import {validateReferenceList} from '#validators';
+import {isThingClass, validateReferenceList} from '#validators';
 
 import {exposeDependency} from '#composite/control-flow';
-import {inputThingClass, inputWikiData, withResolvedReferenceList}
-  from '#composite/wiki-data';
-
-// TODO: Kludge.
-import Thing from '../../things/thing.js';
+import {inputWikiData, withResolvedReferenceList} from '#composite/wiki-data';
 
 export default templateCompositeFrom({
   annotation: `referenceList`,
@@ -22,18 +18,20 @@ export default templateCompositeFrom({
   compose: false,
 
   inputs: {
-    class: inputThingClass(),
+    class: input.staticValue({validate: isThingClass}),
 
     data: inputWikiData({allowMixedTypes: false}),
+
     find: input({type: 'function'}),
   },
 
   update: ({
     [input.staticValue('class')]: thingClass,
-  }) => {
-    const {[Thing.referenceType]: referenceType} = thingClass;
-    return {validate: validateReferenceList(referenceType)};
-  },
+  }) => ({
+    validate:
+      validateReferenceList(
+        thingClass[Symbol.for('Thing.referenceType')]),
+  }),
 
   steps: () => [
     withResolvedReferenceList({
diff --git a/src/data/composite/wiki-properties/singleReference.js b/src/data/composite/wiki-properties/singleReference.js
index 34bd2e6d..db4fc9f9 100644
--- a/src/data/composite/wiki-properties/singleReference.js
+++ b/src/data/composite/wiki-properties/singleReference.js
@@ -8,14 +8,10 @@
 //
 
 import {input, templateCompositeFrom} from '#composite';
-import {validateReference} from '#validators';
+import {isThingClass, validateReference} from '#validators';
 
 import {exposeDependency} from '#composite/control-flow';
-import {inputThingClass, inputWikiData, withResolvedReference}
-  from '#composite/wiki-data';
-
-// TODO: Kludge.
-import Thing from '../../things/thing.js';
+import {inputWikiData, withResolvedReference} from '#composite/wiki-data';
 
 export default templateCompositeFrom({
   annotation: `singleReference`,
@@ -23,17 +19,20 @@ export default templateCompositeFrom({
   compose: false,
 
   inputs: {
-    class: inputThingClass(),
+    class: input.staticValue({validate: isThingClass}),
+
     find: input({type: 'function'}),
+
     data: inputWikiData({allowMixedTypes: false}),
   },
 
   update: ({
     [input.staticValue('class')]: thingClass,
-  }) => {
-    const {[Thing.referenceType]: referenceType} = thingClass;
-    return {validate: validateReference(referenceType)};
-  },
+  }) => ({
+    validate:
+      validateReference(
+        thingClass[Symbol.for('Thing.referenceType')]),
+  }),
 
   steps: () => [
     withResolvedReference({
diff --git a/src/data/composite/wiki-properties/wikiData.js b/src/data/composite/wiki-properties/wikiData.js
index 5cea49a0..3bebed33 100644
--- a/src/data/composite/wiki-properties/wikiData.js
+++ b/src/data/composite/wiki-properties/wikiData.js
@@ -2,12 +2,7 @@
 // trackData, etc.
 
 import {input, templateCompositeFrom} from '#composite';
-import {validateWikiData} from '#validators';
-
-import {inputThingClass} from '#composite/wiki-data';
-
-// TODO: Kludge.
-import Thing from '../../things/thing.js';
+import {isThingClass, validateWikiData} from '#validators';
 
 export default templateCompositeFrom({
   annotation: `wikiData`,
@@ -15,15 +10,18 @@ export default templateCompositeFrom({
   compose: false,
 
   inputs: {
-    class: inputThingClass(),
+    class: input.staticValue({validate: isThingClass}),
   },
 
   update: ({
     [input.staticValue('class')]: thingClass,
-  }) => {
-    const referenceType = thingClass[Thing.referenceType];
-    return {validate: validateWikiData({referenceType})};
-  },
+  }) => ({
+    validate:
+      validateWikiData({
+        referenceType:
+          thingClass[Symbol.for('Thing.referenceType')],
+      }),
+  }),
 
   steps: () => [],
 });
diff --git a/src/data/things/validators.js b/src/data/things/validators.js
index d02e5f28..efe76fe0 100644
--- a/src/data/things/validators.js
+++ b/src/data/things/validators.js
@@ -595,6 +595,16 @@ export function isContentString(content) {
   return true;
 }
 
+export function isThingClass(thingClass) {
+  isFunction(thingClass);
+
+  if (!Object.hasOwn(thingClass, Symbol.for('Thing.referenceType'))) {
+    throw new TypeError(`Expected a Thing constructor, missing Thing.referenceType`);
+  }
+
+  return true;
+}
+
 export const isContribution = validateProperties({
   who: isArtistRef,
   what: optional(isStringNonEmpty),