From 027f5b7e3da15688e56dd281d4b65d643a2733d7 Mon Sep 17 00:00:00 2001
From: Anton Golub <antongolub@antongolub.com>
Date: Thu, 15 Sep 2022 13:44:20 +0300
Subject: [PATCH 1/3] fix(parser): handle empty maybeAlias case

closes #160
---
 source/lib/parser.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/lib/parser.ts b/source/lib/parser.ts
index 37da2dc8..9fa98141 100644
--- a/source/lib/parser.ts
+++ b/source/lib/parser.ts
@@ -24,11 +24,11 @@ export const extractAssertions = (program: Program): Map<Assertion, Set<CallExpr
 
 			// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
 			const maybeAlias = checker.getSymbolAtLocation(expression)!;
-			const symbol = maybeAlias.flags & SymbolFlags.Alias ?
+			const symbol = maybeAlias?.flags & SymbolFlags.Alias ?
 				checker.getAliasedSymbol(maybeAlias) :
 				maybeAlias;
 
-			const identifier = symbol.getName();
+			const identifier = symbol?.getName();
 
 			// Check if the call type is a valid assertion
 			if (assertionFnNames.has(identifier)) {

From 922752d5f042934e8c8c148c79dfc756135aae73 Mon Sep 17 00:00:00 2001
From: Anton Golub <antongolub@antongolub.com>
Date: Thu, 15 Sep 2022 17:37:05 +0300
Subject: [PATCH 2/3] chore(parser): simplify maybeAlias handling

---
 source/lib/parser.ts | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/source/lib/parser.ts b/source/lib/parser.ts
index 9fa98141..44ec440a 100644
--- a/source/lib/parser.ts
+++ b/source/lib/parser.ts
@@ -24,21 +24,23 @@ export const extractAssertions = (program: Program): Map<Assertion, Set<CallExpr
 
 			// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
 			const maybeAlias = checker.getSymbolAtLocation(expression)!;
-			const symbol = maybeAlias?.flags & SymbolFlags.Alias ?
-				checker.getAliasedSymbol(maybeAlias) :
-				maybeAlias;
+			if (maybeAlias) {
+				const symbol = maybeAlias.flags & SymbolFlags.Alias ?
+					checker.getAliasedSymbol(maybeAlias) :
+					maybeAlias;
 
-			const identifier = symbol?.getName();
+				const identifier = symbol.getName();
 
-			// Check if the call type is a valid assertion
-			if (assertionFnNames.has(identifier)) {
-				const assertion = identifier as Assertion;
+				// Check if the call type is a valid assertion
+				if (assertionFnNames.has(identifier)) {
+					const assertion = identifier as Assertion;
 
-				const nodes = assertions.get(assertion) ?? new Set<CallExpression>();
+					const nodes = assertions.get(assertion) ?? new Set<CallExpression>();
 
-				nodes.add(node);
+					nodes.add(node);
 
-				assertions.set(assertion, nodes);
+					assertions.set(assertion, nodes);
+				}
 			}
 		}
 

From 2887a9d44ff6a3e9208c1e89d1925a13845c485e Mon Sep 17 00:00:00 2001
From: Anton Golub <antongolub@antongolub.com>
Date: Thu, 15 Sep 2022 17:42:58 +0300
Subject: [PATCH 3/3] style: rm redundant !

---
 source/lib/parser.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/source/lib/parser.ts b/source/lib/parser.ts
index 44ec440a..5b72a06c 100644
--- a/source/lib/parser.ts
+++ b/source/lib/parser.ts
@@ -22,8 +22,7 @@ export const extractAssertions = (program: Program): Map<Assertion, Set<CallExpr
 				node.expression.name :
 				node.expression;
 
-			// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-			const maybeAlias = checker.getSymbolAtLocation(expression)!;
+			const maybeAlias = checker.getSymbolAtLocation(expression);
 			if (maybeAlias) {
 				const symbol = maybeAlias.flags & SymbolFlags.Alias ?
 					checker.getAliasedSymbol(maybeAlias) :