Restore support for TS 4.0 through 4.5

Resolves #1945

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 .idea
+.vs
 .tscache
 .baseDir.js
 .baseDir.ts
@@ -22,4 +23,4 @@ src/test/renderer/specs/specs.json
 # Built theme JS
 static/main.js
 
-/example/docs/
+/example/docs/

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Unreleased
 
+### Bug Fixes
+
+-   Restore support for TS 4.0 through 4.5, #1945.
+
 ## v0.22.16 (2022-05-30)
 
 ### Features

src/lib/converter/symbols.ts

@@ -666,10 +666,13 @@ function convertProperty(
     }
     reflection.defaultValue = declaration && convertDefaultValue(declaration);
 
+    // FIXME: Once we drop support for TS 4.5, we can use context.checker.getTypeOfSymbol(symbol) here.
     reflection.type = context.converter.convertType(
         context,
         (context.isConvertingTypeNode() ? parameterType : void 0) ??
-            context.checker.getTypeOfSymbol(symbol)
+            context.checker.getTypeOfSymbolAtLocation(symbol, {
+                kind: ts.SyntaxKind.SourceFile,
+            } as any)
     );
 
     if (reflection.flags.isOptional) {

src/lib/types/ts-internal/index.d.ts

@@ -21,8 +21,9 @@ declare module "typescript" {
             signature: ts.Signature
         ): ts.TypePredicate | undefined;
 
-        //https://github.com/microsoft/TypeScript/blob/v4.7.2/src/compiler/types.ts#L4188
-        getTypeOfSymbol(symbol: Symbol): Type;
+        // Since TS 4.6, not available earlier.
+        // https://github.com/microsoft/TypeScript/blob/v4.7.2/src/compiler/types.ts#L4188
+        // getTypeOfSymbol(symbol: Symbol): Type;
     }
 
     export interface Signature {