TS找不到模块

Question

我已经使用https://github.com/FountainJS/generator-fountain-webapp通过React & Typescript建立了一个新项目。我对JS在正在进行的项目中使用node相当满意，但对TS并不熟悉，而TS似乎是问题所在。

我已经在以下环境下运行了生成器: typescript，react，webpack w/ NPM，gulp。

当我运行gulp serve时，我得到了下面的输出。我很困惑为什么它找不到这些文件--它们都在我的文件系统里。我查看了其他问题，但没有找到任何解决我的问题的方法

[23:04:52] Loading /Users/omelvin/github_projects/kaizen/gulp_tasks/browsersync.js
[23:04:53] Loading /Users/omelvin/github_projects/kaizen/gulp_tasks/karma.js
[23:04:54] Loading /Users/omelvin/github_projects/kaizen/gulp_tasks/misc.js
[23:04:54] Loading /Users/omelvin/github_projects/kaizen/gulp_tasks/webpack.js
[23:04:54] Using gulpfile ~/github_projects/kaizen/gulpfile.js
[23:04:54] Starting 'serve'...
[23:04:54] Starting 'webpack:watch'...
ts-loader: Using typescript@2.0.8 and /Users/omelvin/github_projects/kaizen/tsconfig.json
[23:05:01] Time: 6436ms
       Asset     Size  Chunks       Chunk Names
    index.js  1.11 MB       0       main
index.js.map  1.32 MB       0       main

ERROR in ./src/index.tsx
(5,24): error TS2307: Cannot find module 'react'.

ERROR in ./src/index.tsx
(6,27): error TS2307: Cannot find module 'react-dom'.

ERROR in ./src/index.tsx
(7,45): error TS2307: Cannot find module 'react-router'.

ERROR in ./src/index.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.

ERROR in ./src/app/title.tsx
(3,24): error TS2307: Cannot find module 'react'.

ERROR in ./src/app/title.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.

ERROR in ./src/app/techs/techs.tsx
(3,24): error TS2307: Cannot find module 'react'.

ERROR in ./src/app/techs/techs.tsx
(4,24): error TS2307: Cannot find module 'axios'.

ERROR in ./src/app/techs/techs.tsx
(33,10): error TS2339: Property 'state' does not exist on type 'Techs'.

ERROR in ./src/app/techs/techs.tsx
(39,24): error TS2503: Cannot find namespace 'Axios'.

ERROR in ./src/app/techs/techs.tsx
(40,14): error TS2339: Property 'setState' does not exist on type 'Techs'.

ERROR in ./src/app/techs/techs.tsx
(51,17): error TS2339: Property 'state' does not exist on type 'Techs'.

ERROR in ./src/app/techs/techs.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.

ERROR in ./src/app/techs/tech.tsx
(3,24): error TS2307: Cannot find module 'react'.

ERROR in ./src/app/techs/tech.tsx
(50,44): error TS2339: Property 'props' does not exist on type 'TechComponent'.

ERROR in ./src/app/techs/tech.tsx
(52,17): error TS2339: Property 'props' does not exist on type 'TechComponent'.

ERROR in ./src/app/techs/tech.tsx
(54,18): error TS2339: Property 'props' does not exist on type 'TechComponent'.

ERROR in ./src/app/techs/tech.tsx
(55,18): error TS2339: Property 'props' does not exist on type 'TechComponent'.

ERROR in ./src/app/techs/tech.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.

ERROR in ./src/app/main.tsx
(3,24): error TS2307: Cannot find module 'react'.

ERROR in ./src/app/main.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.

ERROR in ./src/app/header.tsx
(3,24): error TS2307: Cannot find module 'react'.

ERROR in ./src/app/header.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.

ERROR in ./src/app/footer.tsx
(3,24): error TS2307: Cannot find module 'react'.

ERROR in ./src/app/footer.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.

ERROR in /Users/omelvin/github_projects/kaizen/src/app/footer.spec.tsx
(4,24): error TS2307: Cannot find module 'react'.

ERROR in /Users/omelvin/github_projects/kaizen/src/app/footer.spec.tsx
(5,27): error TS2307: Cannot find module 'react-dom'.

ERROR in /Users/omelvin/github_projects/kaizen/src/app/footer.spec.tsx
(6,28): error TS2307: Cannot find module 'react-addons-test-utils'.

ERROR in /Users/omelvin/github_projects/kaizen/src/app/footer.spec.tsx
(10,1): error TS2304: Cannot find name 'describe'.

ERROR in /Users/omelvin/github_projects/kaizen/src/app/footer.spec.tsx
(11,3): error TS2304: Cannot find name 'it'.

ERROR in /Users/omelvin/github_projects/kaizen/src/app/footer.spec.tsx
(14,5): error TS2304: Cannot find name 'expect'.

ERROR in /Users/omelvin/github_projects/kaizen/src/app/footer.spec.tsx
(1,1): error TS6053: File '/Users/omelvin/github_projects/kaizen/typings/index.d.ts' not found.
Child html-webpack-plugin for "index.html":
         Asset    Size  Chunks       Chunk Names
    index.html  564 kB       0
[23:05:01] Finished 'webpack:watch' after 6.45 s
[23:05:01] Starting 'watch'...
[23:05:01] Finished 'watch' after 54 ms
[23:05:01] Starting 'browsersync'...
[23:05:01] Finished 'browsersync' after 78 ms
[23:05:01] Finished 'serve' after 6.58 s
[BS] [BrowserSync SPA] Running...
[BS] Access URLs:
 --------------------------------------
       Local: http://localhost:3000
    External: http://10.193.122.24:3000
 --------------------------------------
          UI: http://localhost:3001
 UI External: http://10.193.122.24:3001
 --------------------------------------
[BS] Serving files from: .tmp
[BS] Serving files from: src
ts-loader: Using typescript@2.0.8 and /Users/omelvin/github_projects/kaizen/tsconfig.json
webpack built 5ccca2fe23cfa5a1a610 in 5073ms

Answer 1

TypeScript依赖于定义文件来定义库的类型、接口等。我不熟悉FountainJS，但我猜它足够聪明，可以在您的工作区中创建一个typings.json文件。如果是这样的话，您需要做的就是安装typings (npm install typings --global)，然后通过执行typings install来使用它来安装定义。

如果他们不包括typings.json (尽管我无法想象他们不会)，请按照他们的README上的说明来搜索和安装依赖项的定义。

我通常会将以下几行代码添加到package.json中，以便在您运行npm install时自动安装这些类型

"scripts": { "postinstall": "npm run typings", "typings": "typings install", }

如果你不熟悉TypeScript，我建议你先看看他们的基本教程：https://www.typescriptlang.org/docs/tutorial.html。

Answer 2

̶R̶e̶m̶o̶v̶i̶n̶g̶̶“̶m̶o̶d̶u̶l̶e̶”̶̶a̶n̶d̶̶“̶t̶a̶r̶g̶e̶t̶”̶̶f̶i̶e̶l̶d̶s̶̶f̶r̶o̶m̶̶w̶o̶r̶k̶e̶e̶f̶̶f̶̶r m e̶

更新:删除target是可以的，但删除module不是一个选项，因为编译器依赖于它。您也可以通过向tsconfig添加"moduleResolution": "node"来解决此问题。

Answer 3

您需要确保tsconfig.json文件中存在以下内容

{
    "compilerOptions": {
...
...
      "allowJs": true,
      "skipLibCheck": true,
      "esModuleInterop": true,
      "allowSyntheticDefaultImports": true,
      "strict": true,
      "forceConsistentCasingInFileNames": true,
      "moduleResolution": "node",
      "resolveJsonModule": true,
      "isolatedModules": true,
...
...
    },
    "include": ["src", "decs.d.ts"]
  }  

请注意这一行

"include": ["src", "decs.d.ts"]

确保在文件夹src中创建文件decs.d.ts

因此，文件src/decs.d.ts的内容应该是

declare module 'jwt-decode';

其中jwt-decode是您需要导入的任何ts模块的名称

这应该可以解决找不到模块的错误