From 690543b857113405a592f72d70688e8621fa43a2 Mon Sep 17 00:00:00 2001
From: Gerrit Birkeland <gerrit@gerritbirkeland.com>
Date: Tue, 31 May 2022 19:58:30 -0600
Subject: [PATCH] Restore support for TS 4.0 through 4.5

Resolves #1945
---
 .gitignore                           | 3 ++-
 CHANGELOG.md                         | 4 ++++
 src/lib/converter/symbols.ts         | 5 ++++-
 src/lib/types/ts-internal/index.d.ts | 5 +++--
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 368472d53..c925ecfbc 100644
--- a/.gitignore
+++ b/.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/
\ No newline at end of file
+/example/docs/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62dc53326..bde708bd4 100644
--- a/CHANGELOG.md
+++ b/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
diff --git a/src/lib/converter/symbols.ts b/src/lib/converter/symbols.ts
index 9e246b342..b326cc104 100644
--- a/src/lib/converter/symbols.ts
+++ b/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) {
diff --git a/src/lib/types/ts-internal/index.d.ts b/src/lib/types/ts-internal/index.d.ts
index 76ff46700..77c5aaa88 100644
--- a/src/lib/types/ts-internal/index.d.ts
+++ b/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 {