質問編集履歴
1
補足説明
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File without changes
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@@ -21,6 +21,12 @@
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console.log(selectType('A').name) // A
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console.log(selectType('B').name) // B
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+
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/* Property 'num' does not exist on type 'TypeA | TypeB'.
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Property 'num' does not exist on type 'TypeB' */
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console.log(selectType('A')?.num) // error -> 期待値： 1
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+
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console.log(selectType('B')?.str) // error -> 期待値： hoge
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```
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