{"id":47792,"date":"2023-11-16T10:51:23","date_gmt":"2022-11-10T18:06:41","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%b8%ba%e4%ba%86%e4%bd%bfgatsbytypescript%e6%9b%b4%e5%8a%a0%e8%88%92%e9%80%82%ef%bc%8c%e5%8f%af%e4%bb%a5%e4%bd%bf%e7%94%a8gatsby-plugin-graphql-codegen%e8%bf%9b%e8%a1%8c%e9%85%8d%e7%bd%ae%e3%80%82\/"},"modified":"2024-05-04T09:20:13","modified_gmt":"2024-05-04T01:20:13","slug":"%e4%b8%ba%e4%ba%86%e4%bd%bfgatsbytypescript%e6%9b%b4%e5%8a%a0%e8%88%92%e9%80%82%ef%bc%8c%e5%8f%af%e4%bb%a5%e4%bd%bf%e7%94%a8gatsby-plugin-graphql-codegen%e8%bf%9b%e8%a1%8c%e9%85%8d%e7%bd%ae%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%b8%ba%e4%ba%86%e4%bd%bfgatsbytypescript%e6%9b%b4%e5%8a%a0%e8%88%92%e9%80%82%ef%bc%8c%e5%8f%af%e4%bb%a5%e4%bd%bf%e7%94%a8gatsby-plugin-graphql-codegen%e8%bf%9b%e8%a1%8c%e9%85%8d%e7%bd%ae%e3%80%82\/","title":{"rendered":"\u4e3a\u4e86\u4f7fGatsby+TypeScript\u66f4\u52a0\u8212\u9002\uff0c\u53ef\u4ee5\u4f7f\u7528gatsby-plugin-graphql-codegen\u8fdb\u884c\u914d\u7f6e"},"content":{"rendered":"<p>\u5728 Gatsby + TypeScript \u7684\u67b6\u6784\u4e2d\uff0c\u6709\u4e00\u4e2a\u540d\u4e3agatsby-plugin-graphql-codegen\u7684\u5e93\uff0c\u53ef\u4ee5\u81ea\u52a8\u751f\u6210GraphQL\u7684\u7c7b\u578b\u5b9a\u4e49\u3002<br \/>\n\u4f7f\u7528\u8fd9\u4e2a\u5e93\uff0c\u4eceGraphQL\u83b7\u53d6\u7684\u6570\u636e\u5c06\u81ea\u52a8\u6dfb\u52a0\u7c7b\u578b\uff0c\u4ece\u800c\u4f7f\u5f00\u53d1\u53d8\u5f97\u76f8\u5f53\u65b9\u4fbf\u3002\u4f46\u662f\uff0c\u6211\u9047\u5230\u4e86\u4e00\u4e9b\u95ee\u9898\uff0c\u6240\u4ee5\u6211\u5c06\u5728\u6587\u7ae0\u4e2d\u603b\u7ed3\u6982\u8ff0\u548c\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p>\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u5728\u642d\u5efa Gatsby + TypeScript \u73af\u5883\u65b9\u9762\uff0c\u8fd9\u7bc7\u6587\u7ae0\u975e\u5e38\u6709\u53c2\u8003\u4ef7\u503c\u3002<br \/>\n\u5c06 Gatsby.js \u5b8c\u5168\u8f6c\u4e3a TypeScript &#8211; Qiita<\/p>\n<h1>\u73af\u5883<\/h1>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">TypeScript 3.9.7<\/ul>\n<\/li>\n<\/ul>\n<p>React 16.13.1<\/p>\n<p>Gatsby 2.4.13<\/p>\n<p>gatsby-plugin-graphql-codegen 2.7.1<\/p>\n<h1>\u9019\u500b\u7d50\u8ad6<\/h1>\n<p>\u603b\u7684\u6765\u8bf4\uff0c\u5728gatsby-config.js(.ts)\u4e2d\u52a0\u8f7d\u63d2\u4ef6\u65f6\uff0c\u8bbe\u7f6e\u4ee5\u4e0b\u9009\u9879\u5c06\u4f7f\u60a8\u611f\u5230\u5feb\u4e50\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">plugins<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"c1\">\/\/ ...\u4e2d\u7565<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"na\">resolve<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">gatsby-plugin-graphql-codegen<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">options<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">codegenConfig<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">maybeValue<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">T | undefined<\/span><span class=\"dl\">'<\/span> <span class=\"p\">},<\/span> <span class=\"c1\">\/\/ \u3053\u308c\u3092\u8ffd\u52a0\uff01<\/span>\r\n      <span class=\"p\">},<\/span>\r\n    <span class=\"p\">},<\/span>\r\n  <span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u8fd9\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/h1>\n<p>gatsby-plugin-graphql-codegen\u5728\u4eceGraphQL\u67e5\u8be2\u751f\u6210\u7c7b\u578b\u65f6\uff0c\u5c06\u6240\u6709\u8fd4\u56de\u503c\u90fd\u7528\u540d\u4e3aMaybe\u7684\u7c7b\u578b\u8fdb\u884c\u5305\u88c5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">type<\/span> <span class=\"nx\">Maybe<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">T<\/span> <span class=\"o\">|<\/span> <span class=\"kc\">null<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u4eceGraphQL\u83b7\u53d6\u7684\u6570\u636e\u53ef\u80fd\u4e3anull\uff0c\u56e0\u6b64\u8fd9\u662f\u4e00\u4e2a\u6709\u6548\u7684\u7c7b\u578b\u5b9a\u4e49\u3002<br \/>\n\u5728TypeScript\u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528Optional Chaining?.\u6765\u5b89\u5168\u5730\u83b7\u53d6\u53ef\u4e3a\u7a7a\u7684\u503c\u3002<\/p>\n<h2>\u4f8b\u5982\uff0c\u6211\u6700\u559c\u6b22\u7684\u989c\u8272\u662f\u84dd\u8272\u3002<\/h2>\n<p>\u4ee5 Gatsby \u7684\u9ed8\u8ba4\u6a21\u677f gatsby-starter-default \u4e3a\u4f8b\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528 GraphQL \u67e5\u8be2\u6765\u52a0\u8f7d\u56fe\u7247\u7684\u7ec4\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">react<\/span><span class=\"dl\">\"<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useStaticQuery<\/span><span class=\"p\">,<\/span> <span class=\"nx\">graphql<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">gatsby<\/span><span class=\"dl\">\"<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">Img<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">gatsby-image<\/span><span class=\"dl\">\"<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Image<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">data<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useStaticQuery<\/span><span class=\"p\">(<\/span><span class=\"nx\">graphql<\/span><span class=\"s2\">`\r\n    query {\r\n      placeholderImage: file(relativePath: { eq: \"gatsby-astronaut.png\" }) {\r\n        childImageSharp {\r\n          fluid(maxWidth: 300) {\r\n            ...GatsbyImageSharpFluid\r\n          }\r\n        }\r\n      }\r\n    }\r\n  `<\/span><span class=\"p\">)<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Img<\/span> <span class=\"na\">fluid<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">data<\/span><span class=\"p\">.<\/span><span class=\"nx\">placeholderImage<\/span><span class=\"p\">.<\/span><span class=\"nx\">childImageSharp<\/span><span class=\"p\">.<\/span><span class=\"nx\">fluid<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">Image<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u5c06\u5176\u8f6c\u6362\u4e3aTypeScript\uff0c\u53ef\u4ee5\u8fd9\u6837\u7f16\u5199\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">react<\/span><span class=\"dl\">\"<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useStaticQuery<\/span><span class=\"p\">,<\/span> <span class=\"nx\">graphql<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">gatsby<\/span><span class=\"dl\">\"<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">Img<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">gatsby-image<\/span><span class=\"dl\">\"<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">ImageQuery<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">..\/..\/graphql-types<\/span><span class=\"dl\">\"<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Image<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">data<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useStaticQuery<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">ImageQuery<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"nx\">graphql<\/span><span class=\"s2\">`\r\n    query Image {\r\n      placeholderImage: file(relativePath: { eq: \"gatsby-astronaut.png\" }) {\r\n        childImageSharp {\r\n          fluid(maxWidth: 300) {\r\n            ...GatsbyImageSharpFluid\r\n          }\r\n        }\r\n      }\r\n    }\r\n  `<\/span><span class=\"p\">)<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Img<\/span> <span class=\"na\">fluid<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">data<\/span><span class=\"p\">.<\/span><span class=\"nx\">placeholderImage<\/span><span class=\"p\">?.<\/span><span class=\"nx\">childImageSharp<\/span><span class=\"p\">?.<\/span><span class=\"nx\">fluid<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">Image<\/span>\r\n<\/code><\/pre>\n<p>gatsby-plugin-graphql-codegen\u4f1a\u6839\u636e\u4e3aquery\u547d\u540d\uff08\u5982\u4e0a\u6240\u793a\u7684query Image\uff09\u6765\u81ea\u52a8\u751f\u6210graphql-types.ts\u4e2d\u7684\u7c7b\u578b\u5b9a\u4e49\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u7c7b\u578b\u6307\u5b9a\u4e3auseStaticQuery\uff0c\u8fd9\u6837data\u5c31\u4f1a\u83b7\u5f97\u7c7b\u578b\u8865\u5168\u3002\u5bf9\u4e8eImg\u7ec4\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Optional Chainging\u6765\u4f20\u9012\u503c\uff0c\u8fd9\u6837\u5373\u4f7f\u65e0\u6cd5\u83b7\u53d6\u5230\u56fe\u7247\uff0c\u4e5f\u4e0d\u4f1a\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef\uff0c\u800c\u662f\u4f1a\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<h1>\u53d1\u751f\u7684\u4e8b\u60c5<\/h1>\n<p>\u7136\u800c\uff0c\u6839\u636etsconfig.json\u7684\u8bbe\u7f6e\uff0c\u53ef\u80fd\u4f1a\u53d1\u751f\u7c7b\u4f3c\u4e8e1\u4ee5\u4e0b\u7684\u7f16\u8bd1\u9519\u8bef\u3002<\/p>\n<pre class=\"post-pre\"><code>\u3053\u306e\u547c\u3073\u51fa\u3057\u306b\u4e00\u81f4\u3059\u308b\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306f\u3042\u308a\u307e\u305b\u3093\u3002\r\n  2 \u4e2d 1 \u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9, '(props: Readonly&lt;GatsbyImageProps&gt;): GatsbyImage' \u306b\u3088\u308a\u3001\u6b21\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002\r\n    \u578b 'Pick&lt;ImageSharpFluid, \"base64\" | \"aspectRatio\" | \"src\" | \"srcSet\" | \"sizes\"&gt; | null | undefined' \u3092\r\n\u578b 'FluidObject | FluidObject[] | undefined' \u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\r\n      \u578b 'null' \u3092\u578b 'FluidObject | FluidObject[] | undefined' \u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\r\n  2 \u4e2d 2 \u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9, '(props: GatsbyImageProps, context?: any): GatsbyImage' \u306b\u3088\u308a\u3001\u6b21\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002\r\n    \u578b 'Pick&lt;ImageSharpFluid, \"base64\" | \"aspectRatio\" | \"src\" | \"srcSet\" | \"sizes\"&gt; | null | undefined' \u3092\r\n\u578b 'FluidObject | FluidObject[] | undefined' \u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\r\n      \u578b 'null' \u3092\u578b 'FluidObject | FluidObject[] | undefined' \u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u63d0\u53d6\u8981\u70b9\u65f6\uff0c\u5b83\u8bf4\u201c\u65e0\u6cd5\u5c06null\u5206\u914d\u7ed9undefined\u201d\u3002<br \/>\ngatsby-image\u7ec4\u4ef6\u7684Img\u5df2\u7ecf\u88ab\u5b9a\u4e49\u4e3a\u53ef\u4ee5\u63a5\u53d7undefined\uff0c\u4f46\u4f3c\u4e4e\u65e0\u6cd5\u63a5\u53d7null\u3002<br \/>\n\u6b63\u5982\u4e4b\u524d\u6240\u8ff0\uff0cgatsby-plugin-graphql-codegen\u4f1a\u4f7f\u7528Maybe = T | null\u6765\u5305\u88c5\u6240\u6709\u7c7b\u578b\uff0c\u56e0\u6b64data.placeholderImage?.childImageSharp?.fluid\u53ef\u80fd\u88ab\u5224\u65ad\u4e3anull\u3002<br \/>\n\u8981\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u65b9\u5f0f\u7f16\u5199\uff0c\u5373\u5f53\u4e3anull\u65f6\u81ea\u52a8\u53d8\u4e3aundefined\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Image<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"c1\">\/\/ ...\u7565<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Img<\/span> <span class=\"na\">fluid<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">data<\/span><span class=\"p\">.<\/span><span class=\"nx\">placeholderImage<\/span><span class=\"p\">?.<\/span><span class=\"nx\">childImageSharp<\/span><span class=\"p\">?.<\/span><span class=\"nx\">fluid<\/span> <span class=\"o\">??<\/span> <span class=\"kc\">undefined<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">Image<\/span>\r\n<\/code><\/pre>\n<p>\u53ea\u662f\u8bf4\u5b9e\u8bdd\uff0c\u5bf9\u4e8e\u4eceGraphQL\u83b7\u53d6\u7684\u6240\u6709\u6570\u636e\u6765\u8bf4\uff0c\u8fd9\u6837\u505a\u76f8\u5f53\u56f0\u96be\u3002\u7279\u522b\u662f\u5728React\u7ec4\u4ef6\u4e2d\uff0c\u53ef\u9009\u7684props\u5b9a\u4e49\u7ecf\u5e38\u662fT | undefined\uff0c\u6240\u4ee5\u4f1a\u7ecf\u5e38\u53d1\u751f\u4ecenull\u5230undefined\u7684\u8f6c\u6362\u3002<\/p>\n<h1>\u6216\u8bb8\u53ef\u4ee5\u6539\u53d8\u7684\u90a3\u79cd\u5f62\u5f0f de<\/h1>\n<p>\u6211\u5011\u56de\u5230\u958b\u982d\u7684\u7d50\u8ad6\uff0c\u7576\u63d2\u4ef6\u52a0\u8f09\u6642\uff0c\u9700\u8a18\u9304\u4ee5\u4e0b\u8a2d\u7f6e\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">plugins<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"c1\">\/\/ ...\u4e2d\u7565<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"na\">resolve<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">gatsby-plugin-graphql-codegen<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">options<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">codegenConfig<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">maybeValue<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">T | undefined<\/span><span class=\"dl\">'<\/span> <span class=\"p\">},<\/span> <span class=\"c1\">\/\/ \u3053\u308c\u3092\u8ffd\u52a0\uff01<\/span>\r\n      <span class=\"p\">},<\/span>\r\n    <span class=\"p\">},<\/span>\r\n  <span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u60a8\u53ef\u4ee5\u901a\u8fc7 codegenConfig.maybeValue \u6765\u8986\u76d6\u751f\u6210\u7684 Maybe \u5b9a\u4e49\u3002<br \/>\n\u901a\u8fc7\u5c06 T | null \u66ff\u6362\u4e3a T | undefined\uff0c\u53ef\u4ee5\u5c06\u53ef\u7a7a\u503c\u7edf\u4e00\u4e3a undefined\uff0c\u4ece\u800c\u53ea\u9700\u4f7f\u7528\u7b80\u5355\u7684 Optional Chaining \u6765\u7f16\u5199\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Image<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"c1\">\/\/ ...\u7565<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Img<\/span> <span class=\"na\">fluid<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">data<\/span><span class=\"p\">.<\/span><span class=\"nx\">placeholderImage<\/span><span class=\"p\">?.<\/span><span class=\"nx\">childImageSharp<\/span><span class=\"p\">?.<\/span><span class=\"nx\">fluid<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">Image<\/span>\r\n<\/code><\/pre>\n<h1>\u6539\u53d8\u7c7b\u578b\u5b9a\u4e49\u6ca1\u95ee\u9898\u5417\uff1f<\/h1>\n<p>\u6211\u8ba4\u4e3a\uff0c\u5c06null\u81ea\u52a8\u89c6\u4e3aundefined\u5e76\u4e0d\u4f1a\u6709\u95ee\u9898\u3002\u56e0\u4e3a\u5b83\u53ea\u662f\u6539\u53d8\u4e86\u7c7b\u578b\u5b9a\u4e49\uff0c\u5e76\u4e14\u81f3\u5c11\u5bf9\u8f6c\u7801\u540e\u7684JavaScript\u6ca1\u6709\u5f71\u54cd\u3002\u6211\u8ba4\u4e3a\uff0c\u5982\u679c\u4f7f\u7528\u6700\u65b0\u7684\u5e93\uff0cnull\u548cundefined\u4e4b\u95f4\u7684\u533a\u522b\u4e0d\u4f1a\u5f15\u53d1\u91cd\u5927\u95ee\u9898\uff0c\u4f46\u6211\u5e76\u6ca1\u6709\u68c0\u67e5\u6240\u6709\u60c5\u51b5\u3002\u5982\u679c\u6709\u95ee\u9898\uff0c\u8bf7\u8c05\u89e3\u3002<\/p>\n<h1>\u603b\u7ed3<\/h1>\n<p>gatsby-plugin-graphql-codegen\u306e\u751f\u6210\u3059\u308bnull\u306b\u60a9\u307e\u3055\u308c\u3066\u3044\u308b\u65b9\u306fcodegenConfig: { maybeValue: &#8216;T | undefined&#8217; }\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u5feb\u9069\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093<\/p>\n<div>\u5c06\u201c\u4e25\u683c\u201d\u8bbe\u7f6e\u4e3atrue\u7b49\u7b49<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Gatsby + TypeScript \u7684\u67b6\u6784\u4e2d\uff0c\u6709\u4e00\u4e2a\u540d\u4e3agatsby-plugin-graphql-c [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-47792","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4e3a\u4e86\u4f7fGatsby+TypeScript\u66f4\u52a0\u8212\u9002\uff0c\u53ef\u4ee5\u4f7f\u7528gatsby-plugin-graphql-codegen\u8fdb\u884c\u914d\u7f6e - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4e3a\u4e86\u4f7fgatsbytypescript\u66f4\u52a0\u8212\u9002\uff0c\u53ef\u4ee5\u4f7f\u7528gatsby-plugin-graphql-codegen\u8fdb\u884c\u914d\u7f6e\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4e3a\u4e86\u4f7fGatsby+TypeScript\u66f4\u52a0\u8212\u9002\uff0c\u53ef\u4ee5\u4f7f\u7528gatsby-plugin-graphql-codegen\u8fdb\u884c\u914d\u7f6e\" \/>\n<meta property=\"og:description\" content=\"\u5728 Gatsby + TypeScript \u7684\u67b6\u6784\u4e2d\uff0c\u6709\u4e00\u4e2a\u540d\u4e3agatsby-plugin-graphql-c [&hellip;]\" \/>\n<meta property=\"og:url\" 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