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Mocha

Mocha 7 and newer​

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

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

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