I just tried incorporating Mocha into my Typescript application. This is my tsconfig.json
{
"compilerOptions": {
"target": "ES6",
"module": "commonjs",
"outDir": "../dist",
"sourceMap": true,
"esModuleInterop": true,
"downlevelIteration": true
},
"include": [
"**/*.ts"
]
}
and this is my package.json
{
"name": "game_server",
"version": "1.0.0",
"description": "A backend server for the game ",
"scripts": {
"test": "mocha -r ts-node/register src/**/*.spec.ts",
"start": "concurrently \"tsc -p ./src -w\" \"nodemon ./dist/app.js\" "
},
"author": "XXXXX",
"dependencies": {
"@types/express": "^4.17.6",
"@types/shortid": "0.0.29",
"@types/socket.io": "^2.1.4",
"express": "^4.17.1",
"shortid": "^2.2.15",
"socket.io": "^2.3.0",
"typedeck": "^1.5.2"
},
"devDependencies": {
"@types/chai": "^4.2.11",
"@types/mocha": "^7.0.2",
"chai": "^4.2.0",
"concurrently": "^5.2.0",
"mocha": "^7.1.2",
"nodemon": "^2.0.3",
"ts-node": "^8.10.1",
"typescript": "^3.9.2"
}
}
At some point in my code I am using an for .. of iterator for a map that looks like
for (let [key, value] of cardMap) {
}
When I do a npm run start my code gets compiled fine and the server starts
but when I do npm run test which expands to
mocha -r ts-node/register src/**/*.spec.ts
I get an error on the above line
TSError: ⨯ Unable to compile TypeScript:
src/state/GameState.ts:183:30 - error TS2569: Type 'Map<Player, Card[]>' is not an array type or a string type. Use compiler option '--downlevelIteration' to allow iterating of iterators.
183 for (let [key, value] of cardMap) {
~~~~~~~
I have tried incorporating downLevelIteration=true in my tsconfig, am I missing something to get mocha tests working?
I started using ts-mocha and changed my test script to ts-mocha -p ./src/tsconfig.json ./src/**/*.spec.ts and it started working