Example of Mocha Typescript config

.mocharc.json

{
  "diff": true,
  "extension": ["ts", "js"],
  "package": "./package.json",
  "reporter": "spec",
  "slow": 75,
  "timeout": 2000,
  "watch-files": ["src/**/*.js", "src/**/*.ts"],
  "watch-extensions": ["ts", "js"],
  "require": ["ts-node/register"]
}