neveråã¨ããããã£ã¢ã¯ã»ã¹ TypeScriptã«ã¯neverã¨ããåãããã¾ããå æ¥ãè¨äºã«ãã¾ããããç°¡åã«è¨ãã¨ããã¯ãå¤ãæããªãåãã§ãã neveråã¯ãããããåã«å¯¾ãã¦ãã®é¨ååã¨ãã¦æ¯ãèãã¾ããä¾ãã°ãnever ã number ã®é¨ååã§ãããã¨ã¯æ¬¡ã®ã³ã¼ãã§ãããã¾ãï¼ type T<U extends number> = {}; type A = T<string>; // stringã¯numberã®é¨ååã§ã¯ãªãã®ã§ã¨ã©ã¼ type B = T<never>; // neverã¯numberã®é¨ååãªã®ã§ã³ã³ãã¤ã«ãéã ãã¦ãé¨ååé¢ä¿ã¨ãããã®åã®å¼ã«å¯¾ãã¦ã§ããæä½ã®éåãã®é¢ä¿ã«ã¤ãã¦èãã¾ãããããã¾ãé¢ç½ãä¾ãæãã¤ããªãã£ãã®ã§ã¢ã¬ã§ãããæ¬¡ã®åãèãã¾ãï¼ type UserInfo = { name: string }; type D


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