Ava + ESM + TypeScript: How do I specify a custom config path for tsconfig.json?

[paulshryock]

When my TypeScript config path is ./tsconfig.json, npm test runs perfectly. But when I move my TypeScript config to ./config/tsconfig.json, Ava can't find it, and an exception is thrown.

# tree

.
├── config
│    ├── ava.config.js
│    └── tsconfig.json
├── .env
└── package.json

// ./config/ava.config.js

const config = {
	extensions: {
		ts: 'module',
	},
	files: ['src/**/*.test.ts'],
	nodeArguments: ['--loader=ts-node/esm'],
}

export default config

# ./.env

TS_NODE_PROJECT=config/tsconfig.json

// ./package.json

{
  "scripts": {
    "test": "npx ava --config=./config/ava.config.js --verbose",
    "typecheck": "tsc -p config/tsconfig.json"
  },
  "devDependencies": {
    "@types/node": "^17.0.8",
    "ava": "^4.0.0",
    "esm": "^3.2.25",
    "ts-node": "^10.4.0",
    "tslib": "^2.3.1",
    "typescript": "^4.5.4"
  },
  "engines": {
    "node": "^17.3",
    "npm": "^8.3"
  }
}

I'm looking for a way to pass a custom TypeScript config path to either the CLI or my Ava config. So something like one of these:

npx ava --config=./config/ava.config.js --tsConfig=./config/tsconfig.json --verbose

or

// ./config/ava.config.js

const config = {
	extensions: {
		ts: 'module',
	},
	files: ['src/**/*.test.ts'],
	nodeArguments: ['--loader=ts-node/esm'],
	tsConfig: './config/tsconfig.json',
}

export default config

Is there anything like this possible in the latest version of Ava?

[novemberborn]

AVA isn't involved here, it's something for ts-node.