Fix discovery of tsconfig.json when provided folder ends with .json

Resolves #1712

CHANGELOG.md

@@ -26,6 +26,7 @@
 -   TypeDoc will now only create one highlighter for rendering code, saving ~200-500ms for rendering time.
 -   For compatibility with JSDoc, TypeDoc will now strip `<caption>` elements from `@example` tags, resolves #1679.
 -   TypeScript's `emitDeclarationOnly` compiler option is now supported, resolves #1716.
+-   Fixed discovery of tsconfig.json when the provided path ends in `.json`, resolves #1712.
 -   Fixed a crash when converting the `globalThis` namespace, could only be caused by a plugin.
 
 ### Thanks!

src/lib/utils/options/readers/tsconfig.ts

@@ -1,4 +1,4 @@
-import { resolve, basename, join } from "path";
+import { resolve, join } from "path";
 import { existsSync, statSync } from "fs";
 
 import * as ts from "typescript";
@@ -12,6 +12,10 @@ function isFile(file: string) {
     return existsSync(file) && statSync(file).isFile();
 }
 
+function isDir(path: string) {
+    return existsSync(path) && statSync(path).isDirectory();
+}
+
 export class TSConfigReader implements OptionsReader {
     /**
      * Note: Runs after the {@link TypeDocReader}.
@@ -24,14 +28,8 @@ export class TSConfigReader implements OptionsReader {
         const file = container.getValue("tsconfig");
 
         let fileToRead: string | undefined = file;
-        if (!isFile(fileToRead)) {
-            fileToRead = ts.findConfigFile(
-                file,
-                isFile,
-                file.toLowerCase().endsWith(".json")
-                    ? basename(file)
-                    : undefined
-            );
+        if (isDir(fileToRead)) {
+            fileToRead = ts.findConfigFile(file, isFile);
         }
 
         if (!fileToRead || !isFile(fileToRead)) {

src/test/utils/options/readers/data/folder.json/tsconfig.json

@@ -0,0 +1,5 @@
+{
+    "compilerOptions": {
+        "strict": true
+    }
+}

src/test/utils/options/readers/tsconfig.test.ts

@@ -3,6 +3,7 @@ import { deepStrictEqual as equal } from "assert";
 
 import { TSConfigReader } from "../../../../lib/utils/options/readers";
 import { Logger, Options } from "../../../../lib/utils";
+import { tmpdir } from "os";
 
 describe("Options - TSConfigReader", () => {
     const options = new Options(new Logger());
@@ -21,7 +22,7 @@ describe("Options - TSConfigReader", () => {
 
     testError(
         "Errors if the file cannot be found",
-        join(__dirname, "data/non-existent-file.json")
+        join(tmpdir(), "typedoc/non-existent-file.json")
     );
     testError(
         "Errors if the data is invalid",
@@ -87,4 +88,12 @@ describe("Options - TSConfigReader", () => {
         options.read(new Logger());
         equal(options.getValue("excludeInternal"), false);
     });
+
+    it("Correctly handles folder names ending with .json (#1712)", () => {
+        options.reset();
+        options.setValue("tsconfig", join(__dirname, "data/folder.json"));
+        options.setCompilerOptions([], { strict: false }, void 0);
+        options.read(new Logger());
+        equal(options.getCompilerOptions().strict, true);
+    });
 });