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---
title: Mocha
---
## Mocha 7 and newer
```shell
mocha --require ts-node/register --extensions ts,tsx --watch --watch-files src 'tests/**/*.{ts,tsx}' [...args]
```
Or specify options via your mocha config file.
```json title=".mocharc.json"
{
// Specify "require" for CommonJS
"require": "ts-node/register",
// Specify "loader" for native ESM
"loader": "ts-node/esm",
"extensions": ["ts", "tsx"],
"spec": [
"tests/**/*.spec.*"
],
"watch-files": [
"src"
]
}
```
See also: https://mochajs.org/#configuring-mocha-nodejs
## Mocha <=6
```shell
mocha --require ts-node/register --watch-extensions ts,tsx "test/**/*.{ts,tsx}" [...args]
```
**Note:** `--watch-extensions` is only used in `--watch` mode.
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