Module not found Error when deployed on Heroku
So the issue is not what you posted it is. The issue got fixed because you assume Index.ts or Index.tsx is equivalent to index.ts or index.tsx. If you look at the below thread
webpack: fine on MacOS, loader errors on linux
It explains that building on Mac you wont face the issue. And I assume the same case with Windows as well. But with Linux you will face the issue. That is what is happening here. If you ssh to the heroku box
$ heroku ps:exec
Establishing credentials... done
Connecting to web.1 on ⬢ sleepy-sea-65699...
~ $ webpack -p --verbose
Hash: 8c20236f8268ce043077
Version: webpack 3.10.0
Time: 24904ms
Asset Size Chunks Chunk Names
./docs/dig.js 608 kB 0 [emitted] [big] DIG
./docs/dig.js.map 4.25 MB 0 [emitted] DIG
Entrypoint DIG [big] = ./docs/dig.js ./docs/dig.js.map
chunk {0} ./docs/dig.js, ./docs/dig.js.map (DIG) 1.38 MB [entry] [rendered]
...
...
ERROR in ./src/configureStore.ts
Module not found: Error: Can't resolve './Stores' in '/app/src'
resolve './Stores' in '/app/src'
using description file: /app/package.json (relative path: ./src)
Field 'browser' doesn't contain a valid alias configuration
after using description file: /app/package.json (relative path: ./src)
using description file: /app/package.json (relative path: ./src/Stores)
no extension
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores is not a file
.js
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores.js doesn't exist
.jsx
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores.jsx doesn't exist
.ts
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores.ts doesn't exist
.tsx
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores.tsx doesn't exist
.css
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores.css doesn't exist
as directory
existing directory
using path: /app/src/Stores/index
using description file: /app/package.json (relative path: ./src/Stores/index)
no extension
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores/index doesn't exist
.js
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores/index.js doesn't exist
.jsx
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores/index.jsx doesn't exist
.ts
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores/index.ts doesn't exist
.tsx
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores/index.tsx doesn't exist
.css
Field 'browser' doesn't contain a valid alias configuration
/app/src/Stores/index.css doesn't exist
As you can see the case of the file in error is index and not Index
Also if you check you repo config
$ cat .git/config
[core]
repositoryformatversion = 0
filemode = true
bare = false
logallrefupdates = true
ignorecase = true
precomposeunicode = true
You can see the ignorecase is set to true, which is not good, because then git won't look at the file renames and cases changes and push renamed files.
So essentially the error is that your Index.ts should index.ts to make your build Cross-OS compatible
Case sensitive plugin
You should enable the case sensitive plugin for you development to avoid such issues
$ npm install --save-dev case-sensitive-paths-webpack-plugin
> [email protected] install /Users/tarun.lalwani/Desktop/tarunlalwani.com/tarunlalwani/workshop/ub16/so/DigeratiGlobalReact/node_modules/fsevents
> node install
[fsevents] Success:
+ [email protected]
added 117 packages from 85 contributors and removed 3 packages in 9.661s
Update your webpack.config.js like below
const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;
const rootModulePath = "./src/";
const rootBundlePath = "./src/bundle/";
const isDevBuild = true;
var CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
module.exports = {
stats: { modules: false },
resolve: {
extensions: ['.js', '.jsx', '.ts', '.tsx', '.css']
},
entry: {
'DIG': rootModulePath + "Index.tsx"
},
externals: {
jQuery: 'jQuery'
},
node: {
fs: 'empty'
},
plugins: [
new CaseSensitivePathsPlugin(),
new webpack.ProvidePlugin({
'$': 'jquery',
'jQuery': 'jquery'
}),
....
Now when you build you will see these issues directly in Windows/Mac as well
sh-3.2$ npm run build
> [email protected] build /Users/tarun.lalwani/Desktop/tarunlalwani.com/tarunlalwani/workshop/ub16/so/DigeratiGlobalReact
> webpack -p
Hash: 3762a6deb22d9fabd37b
Version: webpack 3.10.0
Time: 12279ms
Asset Size Chunks Chunk Names
./docs/dig.js 511 kB 0 [emitted] [big] DIG
./docs/dig.js.map 3.56 MB 0 [emitted] DIG
ERROR in ./src/configureStore.ts
Module not found: Error: [CaseSensitivePathsPlugin] `/Users/tarun.lalwani/Desktop/tarunlalwani.com/tarunlalwani/workshop/ub16/so/DigeratiGlobalReact/src/Stores/index.ts` does not match the corresponding path on disk `Index.ts`.
@ ./src/configureStore.ts 6:15-34
@ ./src/Index.tsx
npm ERR! code ELIFECYCLE
npm ERR! errno 2
Your file is called configureStore, while you try to import ConfigureStore, it should be with lowerCase "c".
It works on your machine but Heroku is case sensitive.
I got it working.. Seems on Heroku Directory Import is not working.
Hence, when I qualified my import with 'Index.ts' or 'Index.tsx' the bundle got created perfect and app started to work as below:
From
import * as Store from './ConfigureStore'
To
import * as Store from './ConfigureStore/Index';
Might be helpful to someone in future.