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I am trying to deploy a typescript nodejs app using express to heroku, the code is pushed up fine, heroku installs the dependencies and then runs tsc but crashes with src/controller/adminTypes.ts:3:34 - error TS2307: Cannot find module '../repo/adminTypes'..

I checked the line where the import happens and it looks like this

import insertAdminTypes from "../repo/adminTypes";

The equivalent export happens like so

export const insertAdminTypes = async queryObj => 
 // code
;

VSCode resolves the paths perfectly fine, when I try running tsc locally everything compiles fine and I get the compiled files in the dist folder. It's only heroku that seems to be throwing an error for the paths online. This doesn't happen for every file, the above TS2307 error is thrown only for a few files.

These are the following config files.

package.json

 "name": "express_server",
 "version": "0.0.1",
 "license": "UNLICENSED",
 "main": "./src/server.ts",
 "scripts": 
 "build-ts": "tsc",
 "start": "npx nodemon",
 "prod": "npx run build-ts",
 "postinstall": "npm run build-ts"
 ,
 "dependencies": 
 "@types/body-parser": "^1.17.0",
 "@types/dotenv": "^6.1.0",
 "@types/express": "^4.16.0",
 "@types/jquery": "^3.3.22",
 "@types/node": "^10.12.2",
 "@types/underscore": "^1.8.9",
 "bcrypt": "^3.0.2",
 "body-parser": "^1.18.3",
 "dotenv": "^6.1.0",
 "express": "^4.16.4",
 "express-handlebars": "^3.0.0",
 "jsonwebtoken": "^8.3.0",
 "mongodb": "^3.1.9",
 "mysql": "^2.16.0",
 "nodemon": "^1.18.6",
 "reflect-metadata": "^0.1.12",
 "ts-node": "^7.0.1",
 "typeorm": "^0.2.8",
 "typescript": "^3.1.6",
 "underscore": "^1.9.1"
 ,
 "devDependencies": 
 "husky": "^1.1.3",
 "lint-staged": "^8.0.4",
 "prettier": "^1.15.2",
 "pretty-quick": "^1.8.0",
 "tslint": "^5.11.0",
 "tslint-config-prettier": "^1.15.0",
 "tslint-plugin-prettier": "^2.0.1"
 ,
 "husky": 
 "hooks": 
 "pre-commit": "pretty-quick --staged"
 
 ,
 "lint-staged": 
 "linters": 
 "*.ts": [
 "npx tslint --fix",
 "git add"
 ]
 ,
 "ignore": [
 "./public",
 "./environment",
 "./node_modules"
 ]
 

nodemon.json

 "ignore": ["**/*.test.ts", "**/*.spec.ts", ".git", "node_modules"],
 "watch": ["src"],
 "exec": "npx ts-node ./src/server.ts",
 "ext": "ts"

tsconfig.json

 "compilerOptions": 
 "module": "commonjs",
 "esModuleInterop": true,
 "target": "es6",
 "noImplicitAny": false,
 "moduleResolution": "node",
 "sourceMap": true,
 "outDir": "dist",
 "pretty": true,
 "baseUrl": ".",
 "alwaysStrict": true,
 "emitDecoratorMetadata": true,
 "experimentalDecorators": true,
 "paths": 
 "*": ["node_modules/*", "src/types/*"]
 
 ,
 "include": ["src/**/*.ts"],
 "exclude": ["node_modules"]

Found the issue, it turns out I wasn't paying attention to the filename ie, the case.

For example the error being thrown as described above Cannot find module '../repo/adminTypes' was due to the face that the actual filename was AdminTypes, capital A.

VSCode/ Windows was auto handling case sensitivity so it never threw an error but when deployed to heroku, the server was very strict with filenames.