Vanquish46 Vanquish46 - 1 month ago 29
TypeScript Question

TS cannot find modules

I have used https://github.com/FountainJS/generator-fountain-webapp to set up a new project using React & Typescript. I'm pretty comfortable with JS having used node for an ongoing project, but not familiar with TS where the problem seems to lie.

I have ran the generator with the following environment: typescript, react, webpack w/ NPM, gulp.

When I run

gulp serve
I get the output below. I'm quite confused why it can't find the files - they are all there on my file system. I've looked at other questions and haven't found anything that resolves my issue

[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

TypeScript relies on definition files that define the types, interfaces, etc. for libraries. I'm not familiar with FountainJS, but I'm guessing it's smart enough to create a typings.json file in your workspace. If so, all you need to do is install typings (npm install typings --global) and then use it to install the definitions by doing typings install.

If they didn't include typings.json (though I can't imagine they wouldn't), follow the instructions on their README to search for and install definitions for the dependencies.

I generally add the following lines to package.json so that the typings will be installed automatically any time you run npm install

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

If you're not familiar with TypeScript, I recommend going through their basic tutorial to get you started: https://www.typescriptlang.org/docs/tutorial.html.