From 344bafe5c7b17611f496de52f10c0ed556fe81c7 Mon Sep 17 00:00:00 2001
From: Scott O'Hara <scott@oharagroup.net>
Date: Wed, 28 Aug 2019 03:32:18 +1000
Subject: [PATCH] fix(eslint-plugin): [unbound-method] Allow typeof expressions
 (Fixes #692) (#904)

---
 packages/eslint-plugin/src/rules/unbound-method.ts        | 3 +++
 packages/eslint-plugin/tests/rules/unbound-method.test.ts | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/packages/eslint-plugin/src/rules/unbound-method.ts b/packages/eslint-plugin/src/rules/unbound-method.ts
index c76ac76f9d0..8be7a842c46 100644
--- a/packages/eslint-plugin/src/rules/unbound-method.ts
+++ b/packages/eslint-plugin/src/rules/unbound-method.ts
@@ -120,6 +120,9 @@ function isSafeUse(node: TSESTree.Node): boolean {
     case AST_NODE_TYPES.TaggedTemplateExpression:
       return parent.tag === node;
 
+    case AST_NODE_TYPES.UnaryExpression:
+      return parent.operator === 'typeof';
+
     case AST_NODE_TYPES.TSNonNullExpression:
     case AST_NODE_TYPES.TSAsExpression:
     case AST_NODE_TYPES.TSTypeAssertion:
diff --git a/packages/eslint-plugin/tests/rules/unbound-method.test.ts b/packages/eslint-plugin/tests/rules/unbound-method.test.ts
index 061b4edf524..2c0d1aaf188 100644
--- a/packages/eslint-plugin/tests/rules/unbound-method.test.ts
+++ b/packages/eslint-plugin/tests/rules/unbound-method.test.ts
@@ -97,6 +97,12 @@ instane.boundStatic && 0;
 
 ContainsMethods.boundStatic ? 1 : 0;
 ContainsMethods.unboundStatic ? 1 : 0;
+
+typeof instance.bound === 'function';
+typeof instance.unbound === 'function';
+
+typeof ContainsMethods.boundStatic === 'function';
+typeof ContainsMethods.unboundStatic === 'function';
     `,
     `interface RecordA {
   readonly type: "A"