5-9

1 rollup

rollup 是一个 js 打包器

[1] rollup 从入门到打包一个按需加载的组件库.https://juejin.cn/post/6934698510436859912

[2] 使用 rollup 构建 Javascript 库.https://lexmin0412.github.io/blog/%E5%89%8D%E7%AB%AF%E5%B7%A5%E7%A8%8B%E5%8C%96/%E4%BD%BF%E7%94%A8rollup%E6%9E%84%E5%BB%BAJavascript%E5%BA%93.html#why-rollup

[3] rollup.js 中文文档.https://www.rollupjs.com/

2 react 时间区间选择组件

react-date-range

import { Calendar } from 'react-date-range'

[1] react-date-range.https://www.npmjs.com/package/react-date-range

3 BigNumber 向上取整

var BN = BigNumber.clone()
BN.config({ DECIMAL_PLACES: 2 })

//取值范围：
BigNumber.ROUND_UP = 0 //远离0方向舍入
BigNumber.ROUND_DOWN = 1 //向0方向舍入
BigNumber.ROUND_CEIL = 2 //向正无限大舍入
BigNumber.ROUND_FLOOR = 3 //向负无限大舍入
BigNumber.ROUND_HALF_UP = 4 //四舍五入：向最接近的数字方向舍入，如果与两个相邻数字的距离相等，则向上舍入。
BigNumber.ROUND_HALF_DOWN = 5 //向最接近的数字方向舍入，如果与两个相邻数字的距离相等，则向下舍入。
BigNumber.ROUND_HALF_EVEN = 6 //向最接近数字方向舍入，如果与两个相邻数字的距离相等，则向相邻的偶数舍入
BigNumber.ROUND_HALF_CEIL = 7
BigNumber.ROUND_HALF_FLOOR = 8

[1] bignumber.js 使用记录.https://juejin.cn/post/6844903704714280968

[2] https://mikemcl.github.io/bignumber.js/

4 emotion 的主题类型定义

import '@emotion/react'

declare module '@emotion/react' {
  export interface Theme {
    color: {
      primary: string
      positive: string
      negative: string
    }
  }
}

// You are also able to use a 3rd party theme this way:
import '@emotion/react'
import { LibTheme } from 'some-lib'

declare module '@emotion/react' {
  export interface Theme extends LibTheme {}
}

[1] https://emotion.sh/docs/typescript

5 sx 属性原理

TODO

[1] rebassjs 的 flexbox.https://github.com/rebassjs/rebass/blob/master/packages/reflexbox/src/index.js

6 forwardRef 作用？

const FancyButton = React.forwardRef((props, ref) => (
  <button ref={ref} className="FancyButton">
    {props.children}
  </button>
))

// 你可以直接获取 DOM button 的 ref：
const ref = React.createRef()
;<FancyButton ref={ref}>Click me!</FancyButton>

[1] Refs 转发.https://zh-hans.reactjs.org/docs/forwarding-refs.html

7 合约监听事件

contract.on('ValueChanged', (author, oldValue, newValue, event) => {
  // 在值变化的时候被调用

  console.log(author)
  // "0x14791697260E4c9A71f18484C9f997B308e59325"

  console.log(oldValue)
  // "Hello World"

  console.log(newValue)
  // "Ilike turtles."

  // 查看后面的事件触发器  Event Emitter 了解事件对象的属性
  console.log(event.blockNumber)
  // 4115004
})

8 注意登录服务器的账号

不同账号，有不同.ssh 目录，以及配置

附：腾讯云修改轻量应用服务器的的 ROOT 密码.https://cloud.tencent.com/developer/article/1875209?from=15425

sudo -i

9 搭建 monorepo + nextjs 项目的一些问题

这里有一个比较完整的示例项目：https://github.com/belgattitude/nextjs-monorepo-example

问题一：无法导入外部 Ts 模块

表现

../../packages/uilib/src/components/Alert/index.tsx
Module parse failed: Unexpected token (3:7)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
| export { default as Alert } from './Alert'
| export { variants as alertVariants } from './types'
> export type { AlertProps, Variants as AlertVariants } from './types'
|

原因：nextjs 无法导入外部 Ts 模块

解决方案：

const nextConfig = {
  experimental: {
    // Experimental monorepo support
    // @link {https://github.com/vercel/next.js/pull/22867|Original PR}
    // @link {https://github.com/vercel/next.js/discussions/26420|Discussion}
    externalDir: true,
  },
}

问题一：Can't build React/Next project - found page without a React Component as default export (context api file)

解决方案：把组件搬离到 pages 之外

You should move your components outside the pages folder. pages/ should only be used for page components as Next.js routing is based on its structure.

[1] https://stackoverflow.com/questions/65598753/cant-build-react-next-project-found-page-without-a-react-component-as-default

问题二：nextjs 将文件移动到 src 目录下

nestjs 默认支持将资源放到 src 目录中

[1] https://nextjs.org/docs/advanced-features/src-directory

问题三：在 nextjs 中无法使用 styled-components 的 macro

现象：

cannot find 'module' ...

原因：未知

解决方案：不使用 macro

import styled from 'styled-components'

问题四：nestjs 提示 Warning: Prop className did not match

原因：未知

解决方案：添加 babel 插件处理

yarn add --dev babel-plugin-styled-components

Then add this to .babelrc file:

{
  "presets": ["next/babel"],
  "plugins": [
    [
      "styled-components",
      {
        "ssr": true,
        "displayName": true,
        "preprocess": false
      }
    ]
  ]
}

问题五：Module not found: Can't resolve 'fs' in Next.js application

原因：未知

解决方案：

// Fixes npm packages that depend on `fs` module
// @link https://github.com/vercel/next.js/issues/36514#issuecomment-1112074589
config.resolve.fallback = { ...config.resolve.fallback, fs: false }

附：一份完整的 nextjs 配置

涉及到 监控、导入外部ts模块、安全头部、支持react18 等配置

// @ts-check

// https://nextjs.org/docs/api-reference/next.config.js/introduction
// https://docs.sentry.io/platforms/javascript/guides/nextjs/
const { withSentryConfig } = require('@sentry/nextjs')
// const pc = require('picocolors');
const packageJson = require('./package.json')

const trueEnv = ['true', '1', 'yes']

const isProd = process.env.NODE_ENV === 'production'
const isCI = trueEnv.includes(process.env?.CI ?? 'false')

const NEXTJS_IGNORE_ESLINT = trueEnv.includes(process.env?.NEXTJS_IGNORE_ESLINT ?? 'false')
const NEXTJS_IGNORE_TYPECHECK = trueEnv.includes(process.env?.NEXTJS_IGNORE_TYPECHECK ?? 'false')
const NEXTJS_DISABLE_SENTRY = trueEnv.includes(process.env?.NEXTJS_DISABLE_SENTRY ?? 'false')
const NEXTJS_SENTRY_UPLOAD_DRY_RUN = trueEnv.includes(process.env?.NEXTJS_SENTRY_UPLOAD_DRY_RUN ?? 'false')

/**
 * A way to allow CI optimization when the build done there is not used
 * to deliver an image or deploy the files.
 * @link https://nextjs.org/docs/advanced-features/source-maps
 */
const disableSourceMaps = trueEnv.includes(process.env?.NEXT_DISABLE_SOURCEMAPS ?? 'false')

// if (disableSourceMaps) {
//   console.info(
//     `${pc.green(
//       'notice'
//     )}- Sourcemaps generation have been disabled through NEXT_DISABLE_SOURCEMAPS`
//   );
// }

// Tell webpack to compile those packages
// @link https://www.npmjs.com/package/next-transpile-modules
const tmModules = [
  // for legacy browsers support (only in prod)
  ...(isProd
    ? [
        // ie: '@react-google-maps/api'...
      ]
    : []),
  // ESM only packages are not yet supported by NextJs if you're not
  // using experimental experimental esmExternals
  // @link {https://nextjs.org/blog/next-11-1#es-modules-support|Blog 11.1.0}
  // @link {https://github.com/vercel/next.js/discussions/27876|Discussion}
  // @link https://github.com/vercel/next.js/issues/23725
  // @link https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
  ...[
    // ie: newer versions of https://github.com/sindresorhus packages
  ],
]

// Example of setting up secure headers
// @link https://github.com/jagaapple/next-secure-headers
// const { createSecureHeaders } = require('next-secure-headers');
// const secureHeaders = createSecureHeaders({
//   contentSecurityPolicy: {
//     directives: {
//       // defaultSrc: "'self'",
//       // styleSrc: ["'self'"],
//     },
//   },
//   ...(isProd
//     ? {
//       forceHTTPSRedirect: [
//         true,
//         { maxAge: 60 * 60 * 24 * 4, includeSubDomains: true },
//       ],
//     }
//     : {}),
//   referrerPolicy: 'same-origin',
// });

/**
 * @type {import('next').NextConfig}
 */
const nextConfig = {
  reactStrictMode: true,
  productionBrowserSourceMaps: !disableSourceMaps,
  // i18n,
  optimizeFonts: true,

  httpAgentOptions: {
    // @link https://nextjs.org/blog/next-11-1#builds--data-fetching
    keepAlive: true,
  },

  onDemandEntries: {
    // period (in ms) where the server will keep pages in the buffer
    maxInactiveAge: (isCI ? 3600 : 25) * 1000,
  },

  // @link https://nextjs.org/docs/advanced-features/compiler#minification
  swcMinify: true,

  experimental: {
    // Still buggy as of nextjs 12.1.5
    /**
    emotion: {
      sourceMap: process.env.NODE_ENV === 'development',
      autoLabel: 'dev-only',
      // Allowed values: `[local]` `[filename]` and `[dirname]`
      // This option only works when autoLabel is set to 'dev-only' or 'always'.
      // It allows you to define the format of the resulting label.
      // The format is defined via string where variable parts are enclosed in square brackets [].
      // For example labelFormat: "my-classname--[local]", where [local] will be replaced with the name of the variable the result is assigned to.
      labelFormat: '[local]',
    },
    */
    // React 18
    // @link https://nextjs.org/docs/advanced-features/react-18
    reactRoot: true,
    // React 18 streaming
    // @link https://nextjs.org/docs/advanced-features/react-18/streaming
    runtime: undefined,
    // React 18 server components
    // @link https://nextjs.org/docs/advanced-features/react-18/server-components
    serverComponents: false,
    // Standalone build
    // @link https://nextjs.org/docs/advanced-features/output-file-tracing#automatically-copying-traced-files-experimental
    outputStandalone: false,
    // @link https://nextjs.org/docs/advanced-features/output-file-tracing#caveats
    outputFileTracingRoot: undefined, // ,path.join(__dirname, '../../'),
    // Prefer loading of ES Modules over CommonJS
    // @link {https://nextjs.org/blog/next-11-1#es-modules-support|Blog 11.1.0}
    // @link {https://github.com/vercel/next.js/discussions/27876|Discussion}
    esmExternals: true,
    // Experimental monorepo support
    // @link {https://github.com/vercel/next.js/pull/22867|Original PR}
    // @link {https://github.com/vercel/next.js/discussions/26420|Discussion}
    externalDir: true,
  },

  // @link https://nextjs.org/docs/basic-features/image-optimization
  images: {
    loader: 'default',
    deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
    imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
    disableStaticImages: false,
    // https://nextjs.org/docs/api-reference/next/image#caching-behavior
    minimumCacheTTL: 60,
    // Allowed domains for next/image
    domains: ['source.unsplash.com'],
  },

  typescript: {
    ignoreBuildErrors: NEXTJS_IGNORE_TYPECHECK,
  },

  eslint: {
    ignoreDuringBuilds: NEXTJS_IGNORE_ESLINT,
    dirs: ['src'],
  },

  // async headers() {
  //   return [{ source: '/(.*)', headers: secureHeaders }];
  // },

  /**
   * @link https://nextjs.org/docs/api-reference/next.config.js/rewrites
   async rewrites() {
    return [
      {
        source: `/`,
        destination: '/demo',
      },
    ];
  },
   */

  webpack: (config, { isServer }) => {
    // Fixes npm packages that depend on `fs` module
    // @link https://github.com/vercel/next.js/issues/36514#issuecomment-1112074589
    config.resolve.fallback = { ...config.resolve.fallback, fs: false }

    // config.module.rules.push({
    //   test: /\.svg$/,
    //   issuer: /\.(js|ts)x?$/,
    //   use: [
    //     {
    //       loader: '@svgr/webpack',
    //       // https://react-svgr.com/docs/webpack/#passing-options
    //       options: {
    //         svgo: true,
    //         // @link https://github.com/svg/svgo#configuration
    //         svgoConfig: {
    //           multipass: false,
    //           datauri: 'base64',
    //           js2svg: {
    //             indent: 2,
    //             pretty: false,
    //           },
    //         },
    //       },
    //     },
    //   ],
    // });

    return config
  },
  env: {
    APP_NAME: packageJson.name,
    APP_VERSION: packageJson.version,
    BUILD_TIME: new Date().toISOString(),
  },
  serverRuntimeConfig: {
    // to bypass https://github.com/zeit/next.js/issues/8251
    PROJECT_ROOT: __dirname,
  },
}

let config

if (tmModules.length > 0) {
  const withNextTranspileModules = require('next-transpile-modules')(tmModules, {
    resolveSymlinks: true,
    debug: false,
  })
  config = withNextTranspileModules(nextConfig)
} else {
  config = nextConfig
}

config = withSentryConfig(config, {
  // Additional config options for the Sentry Webpack plugin. Keep in mind that
  // the following options are set automatically, and overriding them is not
  // recommended:
  //   release, url, org, project, authToken, configFile, stripPrefix,
  //   urlPrefix, include, ignore
  // For all available options, see:
  // https://github.com/getsentry/sentry-webpack-plugin#options.
  // silent: isProd, // Suppresses all logs
  dryRun: NEXTJS_SENTRY_UPLOAD_DRY_RUN,
})

if (process.env.ANALYZE === 'true') {
  // @ts-ignore
  const withBundleAnalyzer = require('@next/bundle-analyzer')({
    enabled: true,
  })
  config = withBundleAnalyzer(config)
}

module.exports = config

整个 nextjs 项目详见：https://github.com/belgattitude/nextjs-monorepo-example/tree/main/apps/nextjs-app

10 配置七牛云存储

TODO

[1] 使用七牛云 CDN 为你的网站加速.https://huayig.cn/index.php/archives/18/

[2] 原创】picgo 使用七牛云图床.https://www.yinxiang.com/everhub/note/365dd665-440a-4f37-93b2-1e5b557a9d2f

11 Sentry 在 Nextjs 中的使用初探

TODO

[1] Sentry.https://sentry.io/organizations/ginlink/projects/

[2] Docs.https://docs.sentry.io/platforms/javascript/guides/nextjs/

12 npm 发布包问题 | 发包 | 发版

发包流程请 google 或者 baidu

注意两个问题：1.登录 2.包的配置

问题一：登录

先切换到 npm 服务器

npx nrm use npm

# 切换来可以用
npx nrm use taobao

再尝试登录

npm login

问题二：包的配置

给一个示例配置，注意 publishConfig 权限配置为 public

{
  "name": "@ginlink/eslint-config",
  "version": "0.1.0",
  "description": "React common eslint config",
  "main": "lib/index.js",
  "private": false,
  "publishConfig": {
    "access": "public"
  },
  "files": ["lib"],
  "scripts": {},
  "repository": {},
  "author": "ginlink",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/ginlink/cool-uilib/issues"
  },
  "homepage": "https://github.com/ginlink/cool-uilib#readme",
  "devDependencies": {},
  "dependencies": {
    "@typescript-eslint/eslint-plugin": "^5.22.0",
    "@typescript-eslint/parser": "^5.22.0",
    "eslint": "^8.14.0",
    "eslint-config-prettier": "^8.5.0",
    "eslint-plugin-lodash": "^7.4.0",
    "eslint-plugin-prettier": "^4.0.0",
    "eslint-plugin-react": "^7.29.4",
    "eslint-plugin-react-hooks": "^4.5.0"
  },
  "peerDependencies": {
    "eslint": "^7.2.0",
    "prettier": "^2.1.2"
  }
}

版本问题

增加版本

// version = v1.0.0

npm version prepatch --preid=alpha
// v1.0.2-alpha.0

npm version patch
// v1.0.1

npm version minor
// v1.1.0
npm version major
// v2.0.0

发布测试版

npm publish --tag beta

解决发错版本

不小心将测试版发布到latest解决方法：

latest: 1.0.1-beta.0

// 将1.0.1-beta.0设置为beta
// 该操作会直接生效
npm dist-tag add my-package@1.0.1-beta.0 beta
npm dist-tag add my-package@1.0.0 latest

[1] npm 发包者必读.https://juejin.cn/post/6844903870678695943

13 ethcall

发送请求时与 Promise.all 类似，但 ethcall 会将多个请求封装在同一个 http 包中，从而加快请求速度

注意：其请求通过 multicall 合约读取数据，也可以通过 Deployless Multicall 进行，Deployless Multicall 指无部署 multicall 就能读取到数据。

示例

官方示例

import { InfuraProvider } from '@ethersproject/providers'
import { Contract, Provider } from 'ethcall'

import erc20Abi from './abi/erc20.json'

const infuraKey = 'INSERT_YOUR_KEY_HERE'
const provider = new InfuraProvider('mainnet', infuraKey)

const daiAddress = '0x6b175474e89094c44da98b954eedeac495271d0f'

async function call() {
  const ethcallProvider = new Provider()
  await ethcallProvider.init(provider)

  const daiContract = new Contract(daiAddress, erc20Abi)

  const uniswapDaiPool = '0x2a1530c4c41db0b0b2bb646cb5eb1a67b7158667'

  const ethBalanceCall = ethcallProvider.getEthBalance(uniswapDaiPool)
  const daiBalanceCall = daiContract.balanceOf(uniswapDaiPool)

  const data = await ethcallProvider.all([ethBalanceCall, daiBalanceCall])

  const ethBalance = data[0]
  const daiBalance = data[1]

  console.log('eth balance', ethBalance.toString())
  console.log('dai balance', daiBalance.toString())
}

call()

结论

可以在任意链上使用 ethcall 读取数据，如果该链存在 multicall 合约，则用该合约读取，否则用 Deployless Multicall 读取

[1] https://www.npmjs.com/package/ethcall

14 react-popper 位置展示错误

情景

解决方案

切换状态时，更新位置

const { styles, attributes, update } = usePopper(referenceElement, popperElement, {
  placement: placement,
  modifiers: [
    { name: 'arrow', options: { element: arrowElement } },
    { name: 'offset', options: { offset: [0, 3] } },
  ],
})

const toggleDropdown = (e) => {
  e.preventDefault()
  e.stopPropagation()

  setVisible(!visible)
  update()
}

[1] react-popper incorrect position on mount.https://stackoverflow.com/questions/65585859/react-popper-incorrect-position-on-mount

15 src 和 href 的区别

项目	区别
src(Source)	是指向物件的来源地址，是引入，在 img、script、iframe 等元素上使用
href(Hypertext Reference)	是超文本引用，指向需要连结的地方，是与该页面有关联的，是引用，在 link 和 a 等元素上使用。

16 加载脚本时 defer 和 async 的区别

defer 是最后解析的

17 面试相关题目

Html

• src 和 href 的区别？
• 加载脚本时 defer 和 async 的区别？
• 图片懒加载实现原理？
• 标签语义化的理解？

Css

• css 常见选择器和它们的优先级
• 隐藏元素的几种方式？它们有什么区别？
• 盒模型的理解
• 布局：如何对一个元素实现水平和垂直居中？
• 场景：如何实现 0.5px 的线条？
• 场景：如何实现一个渐变边框？

Js

运行时

• 事件循环模型

React

• 组件通讯方式有什么？

• 什么是受控组件和非受控组件？

• 我们在渲染数组的时候，为什么要提供 key？

• 如何避免不必要的渲染？

网络

• 从输入 url 到页面呈现，中间发生了什么？
• http 协议结构是怎么样的？

算法

• 常见排序算法（选择排序、插入排序）
• 两数之和
• 反转链表

18 如何关闭 react/react-in-jsx-scope

react17 以上可以关闭

.eslintrc.json

{
  "extends": [
    "@ginlink/eslint-config",
    "plugin:react/jsx-runtime"
  ]
}

https://github.com/jsx-eslint/eslint-plugin-react/blob/master/docs/rules/react-in-jsx-scope.md

19 CSS 实现渐变色边框（Gradient borders）

.border-box {
  border: 4px solid transparent;
  border-radius: 16px;
  background-clip: padding-box, border-box;
  background-origin: padding-box, border-box;
  background-image: linear-gradient(to right, #222, #222), linear-gradient(90deg, #8f41e9, #578aef);

  /* 
    linear-gradient(to right, #222, #222)       控制前景色
    linear-gradient(90deg, #8F41E9, #578AEF)    控制背景色
  */
}

[1] CSS 实现渐变色边框（Gradient borders）的 5 种方法.https://segmentfault.com/a/1190000040794056

20 CSS实现渐变文字