TypeError: Unknown file extension ".ts" | about mocha-examples

[huangjihua]

the same

[Sweet-PotEdos]

same here!

[seventeen-yao]

This question comes from Chat.js 5.x, using 4.x will solve that.
chaijs/chai#1594 (reply in thread)

[AntonSweb]

same problem

[AntonSweb]

"loader=ts-node/esm" need to be added to the node-option in the mocha configuration

.mocharc.json

{
  "extension": [
    "ts"
  ],
  "spec": "tests/**/*.spec.ts",
  "require": [
    "ts-node/register"
  ],
  "node-option": [
    "loader=ts-node/esm"
  ],
  "recursive": true
}

[sahin52]

it was related to chai in probably your example
please also check
chaijs/chai#1597