Improve handling of external link resolvers

Noticed when investing adding symbol ID handling in
typedoc-plugin-mdn-links as originally noted was missing in #2700.

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Unreleased
 
+### Bug Fixes
+
+-   Correctly handle external link resolver link text when referencing an external symbol, #2700.
+-   Corrected handling of `@link` tags present in comments at the start of source files.
+
 ## v0.26.7 (2024-09-09)
 
 ### Features

src/lib/converter/comments/discovery.ts

@@ -362,6 +362,18 @@ function findJsDocForComment(
             .getJSDocCommentsAndTags(node)
             .map((doc) => ts.findAncestor(doc, ts.isJSDoc)) as ts.JSDoc[];
 
+        if (ts.isSourceFile(node)) {
+            if (node.statements.length) {
+                jsDocs.push(
+                    ...(ts
+                        .getJSDocCommentsAndTags(node.statements[0])
+                        .map((doc) =>
+                            ts.findAncestor(doc, ts.isJSDoc),
+                        ) as ts.JSDoc[]),
+                );
+            }
+        }
+
         return jsDocs.find((doc) => doc.pos === ranges[0].pos);
     }
 }

src/lib/converter/comments/linkResolver.ts

@@ -141,23 +141,26 @@ function resolveLinkTag(
             defaultDisplayText =
                 part.tsLinkText ||
                 (options.preserveLinkText ? part.text : target.name);
-        } else if (declRef) {
+        } else {
             // If we didn't find a target, we might be pointing to a symbol in another project that will be merged in
             // or some external symbol, so ask external resolvers to try resolution. Don't use regular declaration ref
             // resolution in case it matches something that would have been merged in later.
+            if (declRef) {
+                pos = declRef[1];
+            }
 
             const externalResolveResult = externalResolver(
-                declRef[0],
+                declRef?.[0] ?? part.target.toDeclarationReference(),
                 reflection,
                 part,
-                part.target instanceof ReflectionSymbolId
-                    ? part.target
-                    : undefined,
+                part.target,
             );
 
-            defaultDisplayText = options.preserveLinkText
-                ? part.text
-                : part.text.substring(0, pos);
+            defaultDisplayText =
+                part.tsLinkText ||
+                (options.preserveLinkText
+                    ? part.text
+                    : part.text.substring(0, pos));
 
             switch (typeof externalResolveResult) {
                 case "string":

src/lib/converter/comments/parser.ts

@@ -770,6 +770,10 @@ function inlineTag(
     };
     if (tagName.tsLinkTarget) {
         inlineTag.target = tagName.tsLinkTarget;
+    }
+    // Separated from tsLinkTarget to avoid storing a useless empty string
+    // if TS doesn't have an opinion on what the link text should be.
+    if (tagName.tsLinkText) {
         inlineTag.tsLinkText = tagName.tsLinkText;
     }
     block.push(inlineTag);

src/lib/models/reflections/ReflectionSymbolId.ts

@@ -2,10 +2,16 @@ import { existsSync } from "fs";
 import { isAbsolute, join, relative, resolve } from "path";
 import ts from "typescript";
 import type { JSONOutput, Serializer } from "../../serialization/index";
-import { getCommonDirectory, readFile } from "../../utils/fs";
+import {
+    findPackageForPath,
+    getCommonDirectory,
+    readFile,
+} from "../../utils/fs";
 import { normalizePath } from "../../utils/paths";
 import { getQualifiedName } from "../../utils/tsutils";
 import { optional, validate } from "../../utils/validation";
+import type { DeclarationReference } from "../../converter/comments/declarationReference";
+import { splitUnquotedString } from "./utils";
 
 /**
  * See {@link ReflectionSymbolId}
@@ -78,6 +84,21 @@ export class ReflectionSymbolId {
         }
     }
 
+    toDeclarationReference(): DeclarationReference {
+        return {
+            resolutionStart: "global",
+            moduleSource: findPackageForPath(this.fileName),
+            symbolReference: {
+                path: splitUnquotedString(this.qualifiedName, ".").map(
+                    (path) => ({
+                        navigation: ".",
+                        path,
+                    }),
+                ),
+            },
+        };
+    }
+
     toObject(serializer: Serializer) {
         const sourceFileName = isAbsolute(this.fileName)
             ? normalizePath(

src/lib/models/types.ts

@@ -928,21 +928,6 @@ export class ReferenceType extends Type {
             .fileName.replace(/\\/g, "/");
         if (!symbolPath) return ref;
 
-        // Attempt to decide package name from path if it contains "node_modules"
-        let startIndex = symbolPath.lastIndexOf("node_modules/");
-        if (startIndex !== -1) {
-            startIndex += "node_modules/".length;
-            let stopIndex = symbolPath.indexOf("/", startIndex);
-            // Scoped package, e.g. `@types/node`
-            if (symbolPath[startIndex] === "@") {
-                stopIndex = symbolPath.indexOf("/", stopIndex + 1);
-            }
-            const packageName = symbolPath.substring(startIndex, stopIndex);
-            ref.package = packageName;
-            return ref;
-        }
-
-        // Otherwise, look for a "package.json" file in a parent path
         ref.package = findPackageForPath(symbolPath);
         return ref;
     }

src/lib/utils/fs.ts

@@ -338,6 +338,18 @@ export function discoverPackageJson(dir: string) {
 const packageCache = new Map<string, string>();
 
 export function findPackageForPath(sourcePath: string): string | undefined {
+    // Attempt to decide package name from path if it contains "node_modules"
+    let startIndex = sourcePath.lastIndexOf("node_modules/");
+    if (startIndex !== -1) {
+        startIndex += "node_modules/".length;
+        let stopIndex = sourcePath.indexOf("/", startIndex);
+        // Scoped package, e.g. `@types/node`
+        if (sourcePath[startIndex] === "@") {
+            stopIndex = sourcePath.indexOf("/", stopIndex + 1);
+        }
+        return sourcePath.substring(startIndex, stopIndex);
+    }
+
     const dir = dirname(sourcePath);
     const cache = packageCache.get(dir);
     if (cache) {

src/test/converter2/issues/gh2700.ts

@@ -0,0 +1,6 @@
+/**
+ * {@link Map.size | size user specified}
+ * {@link Map.size user specified}
+ * {@link Map.size}
+ */
+export const abc = new Map<string, number>();

src/test/issues.c2.test.ts

@@ -16,6 +16,7 @@ import {
     QueryType,
     ReferenceReflection,
     ReflectionKind,
+    ReflectionSymbolId,
     ReflectionType,
     SignatureReflection,
     UnionType,
@@ -1732,4 +1733,51 @@ describe("Issue Tests", () => {
             [undefined, "2", '"counterclockwise"'],
         );
     });
+
+    it("#2700a correctly parses links to global properties", () => {
+        const project = convert();
+        app.options.setValue("validation", {
+            invalidLink: true,
+            notDocumented: false,
+            notExported: false,
+        });
+
+        app.validate(project);
+        logger.expectMessage(
+            'warn: Failed to resolve link to "Map.size | size user specified" in comment for abc',
+        );
+        logger.expectMessage(
+            'warn: Failed to resolve link to "Map.size user specified" in comment for abc',
+        );
+        logger.expectMessage(
+            'warn: Failed to resolve link to "Map.size" in comment for abc',
+        );
+
+        const abc = query(project, "abc");
+        const link = abc.comment?.summary.find((c) => c.kind === "inline-tag");
+        ok(link?.target instanceof ReflectionSymbolId);
+    });
+
+    it("#2700b respects user specified link text when resolving external links", () => {
+        const project = convert();
+
+        const abc = query(project, "abc");
+        ok(abc.comment);
+
+        const resolvers = app.converter["_externalSymbolResolvers"].slice();
+        app.converter.addUnknownSymbolResolver(() => {
+            return {
+                target: "https://typedoc.org",
+                caption: "resolver caption",
+            };
+        });
+        app.converter.resolveLinks(abc.comment, abc);
+        app.converter["_externalSymbolResolvers"] = resolvers;
+
+        equal(getLinks(abc), [
+            { display: "size user specified", target: "https://typedoc.org" },
+            { display: "user specified", target: "https://typedoc.org" },
+            { display: "resolver caption", target: "https://typedoc.org" },
+        ]);
+    });
 });