{"id":13598,"date":"2024-01-02T12:48:12","date_gmt":"2024-01-02T09:18:12","guid":{"rendered":"https:\/\/rasanegar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/"},"modified":"2024-01-02T12:48:12","modified_gmt":"2024-01-02T09:18:12","slug":"%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react","status":"publish","type":"post","link":"https:\/\/rasanegaar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/","title":{"rendered":"\u0631\u0641\u0639 \u062e\u0637\u0627\u06cc &#8220;useRef Object is possibly null&#8221; \u062f\u0631 React"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0633\u0631\u0641\u0635\u0644\u0647\u0627\u06cc \u0645\u0637\u0644\u0628<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/rasanegaar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/#%d9%85%d8%b9%d8%b1%d9%81%db%8c\" >\u0645\u0639\u0631\u0641\u06cc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/rasanegaar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/#%da%86%d8%b1%d8%a7_%d8%a7%db%8c%d9%86_%d8%ae%d8%b7%d8%a7_%d8%b1%d8%a7_%d8%af%d8%b1%db%8c%d8%a7%d9%81%d8%aa_%d9%85%db%8c_%da%a9%d9%86%db%8c%d8%af%d8%9f\" >\u0686\u0631\u0627 \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u0645\u06cc \u06a9\u0646\u06cc\u062f\u061f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/rasanegaar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/#%d8%b1%d9%81%d8%b9_%d8%ae%d8%b7%d8%a7_%d8%a8%d8%a7_type_guard\" >\u0631\u0641\u0639 \u062e\u0637\u0627 \u0628\u0627 Type Guard<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/rasanegaar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/#%d8%a8%d8%a7_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d8%a7%d8%b2_%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1_%d8%a7%d8%ae%d8%aa%db%8c%d8%a7%d8%b1%db%8c_%d8%b2%d9%86%d8%ac%db%8c%d8%b1%d9%87_%d8%a7%db%8c\" >\u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0627\u062e\u062a\u06cc\u0627\u0631\u06cc \u0632\u0646\u062c\u06cc\u0631\u0647 \u0627\u06cc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/rasanegaar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/#%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1_%d8%a7%d8%af%d8%b9%d8%a7%db%8c_%d8%ba%db%8c%d8%b1_%d8%aa%d9%87%db%8c\" >\u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0627\u062f\u0639\u0627\u06cc \u063a\u06cc\u0631 \u062a\u0647\u06cc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/rasanegaar.com\/blog\/%d8%b1%d9%81%d8%b9-%d8%ae%d8%b7%d8%a7%db%8c-useref-object-is-possibly-null-%d8%af%d8%b1-react\/#%d9%86%d8%aa%db%8c%d8%ac%d9%87\" >\u0646\u062a\u06cc\u062c\u0647<\/a><\/li><\/ul><\/nav><\/div>\n<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">\u0632\u0645\u0627\u0646 \u0644\u0627\u0632\u0645 \u0628\u0631\u0627\u06cc \u0645\u0637\u0627\u0644\u0639\u0647: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">\u062f\u0642\u06cc\u0642\u0647<\/span><\/span><p> <br \/>\n<\/p>\n<div class=\"mt-8 content\"><noscript><\/p>\n<style>.lazyload-placeholder { display: none;  }<\/style>\n<p><\/noscript><\/p>\n<h2 id=\"introduction\"><span class=\"ez-toc-section\" id=\"%d9%85%d8%b9%d8%b1%d9%81%db%8c\"><\/span>\u0645\u0639\u0631\u0641\u06cc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>React\u060c \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 TypeScript\u060c \u062a\u0631\u06a9\u06cc\u0628\u06cc \u0642\u062f\u0631\u062a\u0645\u0646\u062f \u0628\u0631\u0627\u06cc \u0633\u0627\u062e\u062a \u0628\u0631\u0646\u0627\u0645\u0647 \u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u062f\u06cc \u0648\u0628 \u0642\u0648\u06cc \u0627\u0633\u062a.  \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u06af\u0627\u0647\u06cc \u0627\u0648\u0642\u0627\u062a \u0628\u0627 \u062e\u0637\u0627\u0647\u0627\u06cc TypeScript \u0645\u0648\u0627\u062c\u0647 \u0645\u06cc \u0634\u0648\u06cc\u0645 \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u06af\u06cc\u062c \u06a9\u0646\u0646\u062f\u0647 \u0628\u0627\u0634\u062f\u060c \u0645\u0627\u0646\u0646\u062f \u062e\u0637\u0627\u06cc &#8220;UseRef Object \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u064b \u062a\u0647\u06cc \u0627\u0633\u062a&#8221;.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0628\u0627\u06cc\u062a\u060c \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0631\u0627 \u062a\u0648\u0636\u06cc\u062d \u0645\u06cc \u062f\u0647\u06cc\u0645 \u0648 \u0686\u0646\u062f \u0631\u0627\u0647 \u062d\u0644 \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0622\u0646 \u062f\u0631 \u0628\u0631\u0646\u0627\u0645\u0647 React \u0634\u0645\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u06cc\u0645.<\/p>\n<h2 id=\"whydoyougetthiserror\"><span class=\"ez-toc-section\" id=\"%da%86%d8%b1%d8%a7_%d8%a7%db%8c%d9%86_%d8%ae%d8%b7%d8%a7_%d8%b1%d8%a7_%d8%af%d8%b1%db%8c%d8%a7%d9%81%d8%aa_%d9%85%db%8c_%da%a9%d9%86%db%8c%d8%af%d8%9f\"><\/span>\u0686\u0631\u0627 \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u0645\u06cc \u06a9\u0646\u06cc\u062f\u061f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062e\u0637\u0627\u06cc &#8220;useRef Object isssibly null&#8221; \u0645\u0639\u0645\u0648\u0644\u0627 \u0632\u0645\u0627\u0646\u06cc \u0627\u062a\u0641\u0627\u0642 \u0645\u06cc \u0627\u0641\u062a\u062f \u06a9\u0647 TypeScript \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u062a\u0636\u0645\u06cc\u0646 \u06a9\u0646\u062f \u06a9\u0647 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u06cc\u0627 \u0634\u06cc\u0621 \u0648\u062c\u0648\u062f \u0646\u062e\u0648\u0627\u0647\u062f \u062f\u0627\u0634\u062a. <code>null<\/code> \u06cc\u0627 <code>undefined<\/code> \u062f\u0631 \u0632\u0645\u0627\u0646 \u0627\u062c\u0631\u0627  \u0627\u06cc\u0646 \u062f\u0631 \u0647\u0646\u06af\u0627\u0645 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>useRef<\/code> hook  \u062f\u0631 React<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">import<\/span> React, { useRef } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'react'<\/span>;\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">MyComponent<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n  <span class=\"hljs-keyword\">const<\/span> myRef = useRef(<span class=\"hljs-literal\">null<\/span>);\n\n  <span class=\"hljs-keyword\">return<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">ref<\/span>=<span class=\"hljs-string\">{myRef}<\/span>&gt;<\/span>Hello World<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span><\/span>;\n}\n<\/code><\/pre>\n<p>\u062f\u0631 \u06a9\u062f \u0628\u0627\u0644\u0627\u060c <code>myRef<\/code> \u0628\u0627 \u0645\u0642\u062f\u0627\u0631\u062f\u0647\u06cc \u0627\u0648\u0644\u06cc\u0647 \u0645\u06cc \u0634\u0648\u062f <code>null<\/code>.  TypeScript \u06a9\u0647 \u06cc\u06a9 \u0632\u0628\u0627\u0646 \u062a\u0627\u06cc\u067e \u0627\u06cc\u0633\u062a\u0627 \u0627\u0633\u062a\u060c \u06cc\u06a9 \u062e\u0637\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f \u0632\u06cc\u0631\u0627 \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0622\u0646 \u0631\u0627 \u062a\u0636\u0645\u06cc\u0646 \u06a9\u0646\u062f <code>myRef.current<\/code> \u0646\u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f <code>null<\/code> \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0628\u0639\u062f\u0627\u064b \u0642\u0627\u0628\u0644 \u062f\u0633\u062a\u0631\u0633\u06cc \u0627\u0633\u062a.<\/p>\n<h2 id=\"fixingtheerrorwithtypeguard\"><span class=\"ez-toc-section\" id=\"%d8%b1%d9%81%d8%b9_%d8%ae%d8%b7%d8%a7_%d8%a8%d8%a7_type_guard\"><\/span>\u0631\u0641\u0639 \u062e\u0637\u0627 \u0628\u0627 Type Guard<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u06cc\u06a9 \u0631\u0627\u0647 \u0645\u062a\u062f\u0627\u0648\u0644 \u0628\u0631\u0627\u06cc \u0631\u0641\u0639 \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 &#8220;Type Guard&#8221; \u0627\u0633\u062a.  Type Guard \u0631\u0627\u0647\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 TypeScript \u0645\u06cc \u06af\u0648\u06cc\u062f \u06a9\u0647 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u06cc\u0627 \u0634\u06cc \u062e\u0627\u0635 \u06cc\u06a9 \u0646\u0648\u0639 \u062e\u0627\u0635 \u0627\u0633\u062a.<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">import<\/span> React, { useRef, useEffect } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'react'<\/span>;\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">MyComponent<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n  <span class=\"hljs-keyword\">const<\/span> myRef = useRef(<span class=\"hljs-literal\">null<\/span>);\n\n  useEffect(<span class=\"hljs-function\">() =&gt;<\/span> {\n    <span class=\"hljs-keyword\">if<\/span> (myRef.current !== <span class=\"hljs-literal\">null<\/span>) {\n      <span class=\"hljs-comment\">\/\/ Now TypeScript knows that myRef.current is not null<\/span>\n      <span class=\"hljs-built_in\">console<\/span>.log(myRef.current);\n    }\n  }, ());\n\n  <span class=\"hljs-keyword\">return<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">ref<\/span>=<span class=\"hljs-string\">{myRef}<\/span>&gt;<\/span>Hello World<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span><\/span>;\n}\n<\/code><\/pre>\n<p>\u062f\u0631 \u06a9\u062f \u0628\u0647 \u0631\u0648\u0632 \u0634\u062f\u0647 \u0628\u0627\u0644\u0627\u060c \u0645\u0627 \u0627\u0632 \u06cc\u06a9 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u0645 <code>if<\/code> \u0628\u06cc\u0627\u0646\u06cc\u0647 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062d\u0627\u0641\u0638 \u0646\u0648\u0639 \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 <code>myRef.current<\/code> \u0646\u06cc\u0633\u062a <code>null<\/code> \u0642\u0628\u0644 \u0627\u0632 \u062b\u0628\u062a \u0622\u0646  \u0628\u0647 \u0627\u06cc\u0646 \u062a\u0631\u062a\u06cc\u0628\u060c TypeScript \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0622\u0646 \u0631\u0627 \u062a\u0636\u0645\u06cc\u0646 \u06a9\u0646\u062f <code>myRef.current<\/code> \u0646\u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f <code>null<\/code> \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u062f\u0631 \u0646\u0647\u0627\u06cc\u062a \u0628\u0647 \u0622\u0646 \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u06a9\u0631\u062f.<\/p>\n<h2 id=\"usingtheoptionalchainingoperator\"><span class=\"ez-toc-section\" id=\"%d8%a8%d8%a7_%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87_%d8%a7%d8%b2_%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1_%d8%a7%d8%ae%d8%aa%db%8c%d8%a7%d8%b1%db%8c_%d8%b2%d9%86%d8%ac%db%8c%d8%b1%d9%87_%d8%a7%db%8c\"><\/span>\u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0627\u062e\u062a\u06cc\u0627\u0631\u06cc \u0632\u0646\u062c\u06cc\u0631\u0647 \u0627\u06cc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0631\u0627\u0647 \u062f\u06cc\u06af\u0631 \u0628\u0631\u0627\u06cc \u062d\u0644 \u062e\u0637\u0627\u06cc &#8220;UseRef Object is Possibly Null&#8221; \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0639\u0645\u0644\u06af\u0631 Optional Chaining \u0627\u0633\u062a.<code>?.<\/code>).  \u0627\u06cc\u0646 \u0639\u0645\u0644\u06af\u0631 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0628\u0647 \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u0639\u0645\u06cc\u0642 \u062a\u0648 \u062f\u0631 \u062a\u0648 \u06cc\u06a9 \u0634\u06cc \u062f\u0633\u062a\u0631\u0633\u06cc \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f <em>\u0628\u062f\u0648\u0646<\/em> \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0628\u0631\u0631\u0633\u06cc \u0648\u062c\u0648\u062f \u0647\u0631 \u0648\u06cc\u0698\u06af\u06cc \u062f\u0631 \u0632\u0646\u062c\u06cc\u0631\u0647.<\/p>\n<div data-nosnippet=\"\" id=\"newsletter\">\n<div class=\"bg-gray-100 border rounded my-8\">\n<div class=\"py-3 px-3 sm:px-4 lg:py-6 lg:px-6\">\n<div class=\"text-center\"><span class=\"text-xl font-extrabold tracking-tight text-gray-600 sm:text-2xl\">\u062f\u0648\u0631\u0647 \u0647\u0627\u06cc \u0631\u0627\u06cc\u06af\u0627\u0646\u060c \u067e\u0631\u0648\u0698\u0647 \u0647\u0627\u06cc \u0647\u062f\u0627\u06cc\u062a \u0634\u062f\u0647 \u0648 \u0645\u0648\u0627\u0631\u062f \u062f\u06cc\u06af\u0631 \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u06a9\u0646\u06cc\u062f<\/span><\/div>\n<div class=\"mt-4\">\n<div class=\"flex justify-center\">\n<div class=\"flex-grow flex-col justify-center\">\n<form class=\"group sm:flex sm:justify-center\"><label for=\"email-address\" class=\"sr-only\">\u0622\u062f\u0631\u0633 \u0627\u06cc\u0645\u06cc\u0644<\/label><input id=\"email-address\" name=\"email-address\" type=\"email\" autocomplete=\"email\" required=\"\" class=\"flex-1 w-full sm:max-w-md px-5 py-3 border sm:border-r-0 border-gray-400 placeholder-gray-500 rounded-md sm:rounded-r-none sm:rounded-l-md focus:ring-0 focus:border-gray-900\" placeholder=\"Enter your email\" value=\"\"><\/p>\n<div class=\"mt-3 sm:mt-0 sm:flex-shrink-0\"><button type=\"submit\" class=\"w-full flex items-center justify-center px-5 py-3 rounded-md sm:rounded-l-none sm:rounded-r-md shadow border border-transparent text-base font-medium text-white bg-orange-500 hover:bg-orange-600\">\u0627\u0634\u062a\u0631\u0627\u06a9 \u062f\u0631<\/button><\/div>\n<\/form>\n<p class=\"text-center mt-3 text-sm text-gray-500\">\u0628\u062f\u0648\u0646 \u0647\u0631\u0632\u0646\u0627\u0645\u0647 \u0647\u0631\u06af\u0632.  \u0644\u063a\u0648 \u0627\u0634\u062a\u0631\u0627\u06a9 \u062f\u0631 \u0647\u0631 \u0632\u0645\u0627\u0646.  \u0645\u0627 \u0631\u0627 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f<!-- --> \u0633\u06cc\u0627\u0633\u062a \u062d\u0641\u0638 \u062d\u0631\u06cc\u0645 \u062e\u0635\u0648\u0635\u06cc.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">import<\/span> React, { useRef, useEffect } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'react'<\/span>;\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">MyComponent<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n  <span class=\"hljs-keyword\">const<\/span> myRef = useRef(<span class=\"hljs-literal\">null<\/span>);\n\n  useEffect(<span class=\"hljs-function\">() =&gt;<\/span> {\n    <span class=\"hljs-comment\">\/\/ Using optional chaining operator<\/span>\n    <span class=\"hljs-built_in\">console<\/span>.log(myRef.current?.innerText);\n  }, ());\n\n  <span class=\"hljs-keyword\">return<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">ref<\/span>=<span class=\"hljs-string\">{myRef}<\/span>&gt;<\/span>Hello World<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span><\/span>;\n}\n<\/code><\/pre>\n<p>\u062f\u0631 \u06a9\u062f \u0628\u0627\u0644\u0627\u060c \u0645\u0627 \u0627\u0632 \u0639\u0645\u0644\u06af\u0631 Optional Chaining \u0628\u0631\u0627\u06cc \u062f\u0633\u062a\u0631\u0633\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u0645 <code>innerText<\/code> \u0627\u0632 <code>myRef.current<\/code>.  \u0627\u06af\u0631 <code>myRef.current<\/code> \u0635\u0641\u0631 \u0627\u0633\u062a\u060c \u0633\u067e\u0633 \u0639\u0628\u0627\u0631\u062a &#8220;\u0627\u062a\u0635\u0627\u0644 \u06a9\u0648\u062a\u0627\u0647&#8221; \u0648 <code>undefined<\/code> \u0628\u0627\u0632\u06af\u0631\u062f\u0627\u0646\u062f\u0647 \u062e\u0648\u0627\u0647\u062f \u0634\u062f\u060c \u06a9\u0647 \u0627\u0632 \u0647\u0631\u06af\u0648\u0646\u0647 \u062e\u0637\u0627\u06cc \u0632\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<h2 id=\"thenonnullassertionoperator\"><span class=\"ez-toc-section\" id=\"%d8%a7%d9%be%d8%b1%d8%a7%d8%aa%d9%88%d8%b1_%d8%a7%d8%af%d8%b9%d8%a7%db%8c_%d8%ba%db%8c%d8%b1_%d8%aa%d9%87%db%8c\"><\/span>\u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0627\u062f\u0639\u0627\u06cc \u063a\u06cc\u0631 \u062a\u0647\u06cc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 TypeScript\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u063a\u06cc\u0631<code>null<\/code> \u0639\u0645\u0644\u06af\u0631 \u0627\u062f\u0639\u0627 \u0628\u0631\u0627\u06cc \u062d\u0644 \u062e\u0637\u0627.  \u0639\u0645\u0644\u06af\u0631 \u063a\u06cc\u0631 \u062a\u0647\u06cc \u06cc\u06a9 \u0639\u0645\u0644\u06af\u0631 \u0639\u0628\u0627\u0631\u062a \u067e\u0633\u0648\u0646\u062f\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0627 \u0639\u0644\u0627\u0645\u062a \u062a\u0639\u062c\u0628 (!) \u0646\u0634\u0627\u0646 \u062f\u0627\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f.  \u0627\u06cc\u0646 \u0639\u0645\u0644\u06af\u0631 \u0632\u0645\u0627\u0646\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f \u06a9\u0647 \u0645\u0637\u0645\u0626\u0646 \u0628\u0627\u0634\u06cc\u062f \u0639\u0628\u0627\u0631\u062a \u0642\u0628\u0644 \u0627\u0632 \u0639\u0645\u0644\u06af\u0631 \u0646\u06cc\u0633\u062a <code>null<\/code> \u06cc\u0627 <code>undefined<\/code>.<\/p>\n<p>\u0628\u06cc\u0627\u06cc\u06cc\u062f \u06cc\u06a9 \u0645\u062b\u0627\u0644 \u0631\u0627 \u0628\u0628\u06cc\u0646\u06cc\u0645:<\/p>\n<pre><code class=\"hljs\"><span class=\"hljs-keyword\">const<\/span> ref = useRef&lt;HTMLDivElement&gt;(<span class=\"hljs-literal\">null<\/span>);\n<span class=\"hljs-comment\">\/\/... some code<\/span>\nref.current!.focus();\n<\/code><\/pre>\n<p>\u062f\u0631 \u06a9\u062f \u0628\u0627\u0644\u0627\u060c \u0645\u0627 \u0627\u0632 \u063a\u06cc\u0631<code>null<\/code> \u0639\u0645\u0644\u06af\u0631 \u0627\u062f\u0639\u0627 (!) \u0628\u0639\u062f \u0627\u0632 <code>ref.current<\/code>.  \u0627\u06cc\u0646 \u0628\u0647 TypeScript \u0645\u06cc \u06af\u0648\u06cc\u062f \u06a9\u0647 <code>ref.current<\/code> \u0647\u0631\u06af\u0632 \u0646\u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f <code>null<\/code> \u06cc\u0627 <code>undefined<\/code> \u0648\u0642\u062a\u06cc \u06a9\u0647 <code>focus()<\/code> \u0631\u0648\u0634 \u0646\u0627\u0645\u06cc\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f.  \u0627\u06cc\u0646 \u0631\u0627\u0647\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 TypeScript \u0645\u06cc \u06af\u0648\u06cc\u06cc\u0645 \u0628\u0647 \u0645\u0627 \u0627\u0639\u062a\u0645\u0627\u062f \u06a9\u0646\u062f \u06a9\u0647 \u0645\u0627 \u0622\u0646 \u0631\u0627 \u0645\u062f\u06cc\u0631\u06cc\u062a \u06a9\u0631\u062f\u0647 \u0627\u06cc\u0645 <code>null<\/code> \u06cc\u0627 <code>undefined<\/code> \u0645\u0648\u0631\u062f \u062e\u0648\u062f\u0645\u0627\u0646<\/p>\n<div class=\"alert alert-note\">\n<div class=\"flex\">\n<div class=\"flex-shrink-0 mr-3\"><\/div>\n<div class=\"w-full\">\n<p><strong>\u062a\u0648\u062c\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f:<\/strong> \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u063a\u06cc\u0631<code>null<\/code> \u0627\u067e\u0631\u0627\u062a\u0648\u0631 \u0627\u062f\u0639\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u06cc\u06a9 \u0631\u0627\u0647 \u062d\u0644 \u0633\u0631\u06cc\u0639 \u0628\u0627\u0634\u062f\u060c \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0628\u06cc\u0634 \u0627\u0632 \u062d\u062f \u0627\u0632 \u0622\u0646 \u062a\u0648\u0635\u06cc\u0647 \u0646\u0645\u06cc \u0634\u0648\u062f.  \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0628\u06cc\u0634 \u0627\u0632 \u062d\u062f \u0627\u0632 \u063a\u06cc\u0631<code>null<\/code> \u0639\u0645\u0644\u06af\u0631 \u0627\u062f\u0639\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0645\u0646\u062c\u0631 \u0628\u0647 \u062e\u0637\u0627\u0647\u0627\u06cc \u0632\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u0634\u0648\u062f \u0632\u06cc\u0631\u0627 \u06a9\u0627\u0645\u067e\u0627\u06cc\u0644\u0631 TypeScript \u0631\u0627 \u062f\u0648\u0631 \u0645\u06cc \u0632\u0646\u062f <code>null<\/code> \u0648 <code>undefined<\/code> \u0686\u06a9 \u0647\u0627<\/p>\n<\/p><\/div><\/div><\/div>\n<h2 id=\"conclusion\"><span class=\"ez-toc-section\" id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\"><\/span>\u0646\u062a\u06cc\u062c\u0647<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0628\u0627\u06cc\u062a\u060c \u0631\u0648\u0634 \u062d\u0644 \u062e\u0637\u0627\u06cc \u201cuseRef Object is possibly null\u201d \u0631\u0627 \u062f\u0631 React \u062f\u06cc\u062f\u06cc\u0645.  \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0627\u0632 Type Guard\u060c Operator Chaining Optional \u06cc\u0627 Non-Null Assertion Operator \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f\u06cc\u0645.  \u0628\u0647 \u06cc\u0627\u062f \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f\u060c \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u0627\u06cc\u0646 \u0631\u0627\u0647 \u062d\u0644 \u0647\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u0646\u062f \u0628\u0647 \u0634\u0645\u0627 \u06a9\u0645\u06a9 \u06a9\u0646\u0646\u062f \u062a\u0627 \u06a9\u0627\u0645\u067e\u0627\u06cc\u0644\u0631 TypeScript \u0631\u0627 \u062f\u0648\u0631 \u0628\u0632\u0646\u06cc\u062f <code>null<\/code> \u0648 <code>undefined<\/code> \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f\u060c \u0647\u0645\u0686\u0646\u06cc\u0646 \u0645\u0647\u0645 \u0627\u0633\u062a \u06a9\u0647 \u0627\u06cc\u0646 \u0645\u0648\u0627\u0631\u062f \u0631\u0627 \u0628\u0647 \u062f\u0631\u0633\u062a\u06cc \u062f\u0631 \u06a9\u062f \u062e\u0648\u062f \u0645\u062f\u06cc\u0631\u06cc\u062a \u06a9\u0646\u06cc\u062f \u062a\u0627 \u0627\u0632 \u0633\u0627\u06cc\u0631 \u062e\u0637\u0627\u0647\u0627\u06cc \u0632\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0646\u06cc\u062f.<\/p>\n<\/div>\n<p><br \/>\n<br \/>\u0645\u0646\u062a\u0634\u0631 \u0634\u062f\u0647 \u062f\u0631 1403-01-02 12:48:08<br \/>\n<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-center kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;center&quot;,&quot;id&quot;:&quot;13598&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;\u0627\u0645\u062a\u06cc\u0627\u0632 \u0634\u0645\u0627 \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0637\u0644\u0628&quot;,&quot;legend&quot;:&quot;0\\\/5 (0 \u0631\u0627\u06cc)&quot;,&quot;size&quot;:&quot;30&quot;,&quot;title&quot;:&quot;\u0631\u0641\u0639 \u062e\u0637\u0627\u06cc \\u0026quot;useRef Object is possibly null\\u0026quot; \u062f\u0631 React&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} ({count} \u0631\u0627\u06cc)&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-left: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 30px; height: 30px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 24px;\">\n            <span class=\"kksr-muted\">\u0627\u0645\u062a\u06cc\u0627\u0632 \u0634\u0645\u0627 \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0637\u0644\u0628<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">\u0632\u0645\u0627\u0646 \u0644\u0627\u0632\u0645 \u0628\u0631\u0627\u06cc \u0645\u0637\u0627\u0644\u0639\u0647: <\/span> <span class=\"rt-time\"> 3<\/span> <span class=\"rt-label rt-postfix\">\u062f\u0642\u06cc\u0642\u0647<\/span><\/span>\u0645\u0639\u0631\u0641\u06cc React\u060c \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 TypeScript\u060c \u062a\u0631\u06a9\u06cc\u0628\u06cc \u0642\u062f\u0631\u062a\u0645\u0646\u062f \u0628\u0631\u0627\u06cc \u0633\u0627\u062e\u062a \u0628\u0631\u0646\u0627\u0645\u0647 \u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u062f\u06cc \u0648\u0628 \u0642\u0648\u06cc \u0627\u0633\u062a. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u06af\u0627\u0647\u06cc \u0627\u0648\u0642\u0627\u062a \u0628\u0627 \u062e\u0637\u0627\u0647\u0627\u06cc TypeScript \u0645\u0648\u0627\u062c\u0647 \u0645\u06cc \u0634\u0648\u06cc\u0645 \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u06af\u06cc\u062c \u06a9\u0646\u0646\u062f\u0647 \u0628\u0627\u0634\u062f\u060c \u0645\u0627\u0646\u0646\u062f \u062e\u0637\u0627\u06cc &#8220;UseRef Object \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u064b \u062a\u0647\u06cc \u0627\u0633\u062a&#8221;. \u062f\u0631 \u0627\u06cc\u0646 \u0628\u0627\u06cc\u062a\u060c \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0631\u0627 \u062a\u0648\u0636\u06cc\u062d \u0645\u06cc \u062f\u0647\u06cc\u0645 \u0648 \u0686\u0646\u062f \u0631\u0627\u0647 \u062d\u0644 \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0622\u0646 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