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Mocha

Mocha 7 and newer#

mocha --require ts-node/register --extensions ts,tsx --watch --watch-files src 'tests/**/*.{ts,tsx}' [...args]

Or specify options via your mocha config file.

.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#

mocha --require ts-node/register --watch-extensions ts,tsx "test/**/*.{ts,tsx}" [...args]

Note: --watch-extensions is only used in --watch mode.