typescript - useStaticQuery : Invalid hook call. Hooks只能在函数组件体内调用

Question

我正在尝试通过 useStaticQuery 从 gatsby-config.js 获取值。我的代码如下。

谁能有解决这个问题的想法？

提前致谢

repo
https://github.com/koji/portfolio

包.json

"dependencies": {
    "@babel/core": "^7.5.5",
    "gatsby": "^2.13.28",
    "gatsby-link": "^2.2.2",
    "gatsby-plugin-react-helmet": "^3.1.2",
    "gatsby-plugin-sass": "^2.1.3",
    "gatsby-plugin-typescript": "^2.1.2",
    "gatsby-source-filesystem": "^2.1.8",
    "gatsby-source-instagram-all": "^2.0.5",
    "gatsby-transformer-remark": "^2.6.10",
    "node-sass": "^4.12.0",
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "webpack": "^4.36.1"
  },
  "devDependencies": {
    "@types/react": "^16.8.24",
    "@types/react-dom": "^16.8.5",
    "@types/react-helmet-async": "^1.0.0",
    "env-cmd": "^9.0.3",
    "eslint-plugin-react-hooks": "^1.6.1",
    "gatsby-plugin-tslint": "^0.0.2",
    "tslint": "^5.18.0",
    "tslint-loader": "^3.5.4",
    "tslint-react": "^4.0.0",
    "typescript": "^3.5.3"
  }

网站元数据.ts

import { useStaticQuery, graphql } from "gatsby";
export const useSiteMetadata = () => {
  const { site } = useStaticQuery(
    graphql`
      query {
        site {
          siteMetadata {
            title
            author
          }
        }
      }
    `);
  return site.siteMetadata.title;
};

import * as React from "react";
import { useSiteMetadata } from 'siteMetadata'


export default class Header extends React.Component {
  render() {
    const {title} = useSiteMetadata();
    return (
        <h1>
          <Link className={headerStyles.title} to="/">
            {title}
          </Link>
        </h1>
    )
  }
}

Gatsby -config.js

module.exports = {
  siteMetadata: {
    title: "page title",
    author: "me"
  }
}

Answer 1

组件名称首字母未大写导致此问题；

和 useStaticQuery 不是那样工作的，您需要在您在那里使用它的组件内呈现依赖于此查询的组件的子组件；

组件 UseSiteMetadata 将是:

import { useStaticQuery, graphql } from "gatsby";
export const useSiteMetadata = () => {
  const { site } = useStaticQuery(
    graphql`
      query {
        site {
          siteMetadata {
            title
            author
          }
        }
      }
    `);
  return (
        <h1>
          <Link className={headerStyles.title} to="/">
            {site.siteMetadata.title}
          </Link>
        </h1>
  );

Header 将是:

import * as React from "react";
import { UseSiteMetadata } from 'siteMetadata'


export default class Header extends React.Component {
  render() {
    return (<UseSiteMetadata /> )
  }
}