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AVA

Assuming you are configuring AVA via your package.json, add one of the following configurations.

CommonJS#

Use this configuration if your package.json does not have "type": "module".

{
"ava": {
"extensions": [
"ts"
],
"require": [
"ts-node/register"
]
}
}

Native ECMAScript modules#

This configuration is necessary if your package.json has "type": "module".

{
"ava": {
"extensions": {
"ts": "module"
},
"nonSemVerExperiments": {
"configurableModuleFormat": true
},
"nodeArguments": [
"--loader=ts-node/esm"
]
}
}