【nodejsでユニットテスト】Mocha/ChaiのESModule対応〜ビルドインTest runnerを参考に動作させてみる

            
            $ node --version
v20.10.0

$ node --test
ℹ tests 0
ℹ suites 0
ℹ pass 0
ℹ fail 0
ℹ cancelled 0
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 110.593313
        

            
            $ node --test hoge.js
        

            
            $ node --test hoge.ts
node:internal/modules/esm/get_format:160
  throw new ERR_UNKNOWN_FILE_EXTENSION(ext, filepath);
        ^

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /********/hoge.ts
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:160:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:203:36)
    at defaultLoad (node:internal/modules/esm/load:141:22)
    at async ModuleLoader.load (node:internal/modules/esm/loader:409:7)
    at async ModuleLoader.moduleProvider (node:internal/modules/esm/loader:291:45)
    at async link (node:internal/modules/esm/module_job:76:21) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}
        

            
            $ node --require ts-node/register hoge.ts
TypeError: Unknown file extension ".ts" for /.../hoge.ts
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:160:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:203:36)
    at defaultLoad (node:internal/modules/esm/load:141:22)
    at async ModuleLoader.load (node:internal/modules/esm/loader:409:7)
    at async ModuleLoader.moduleProvider (node:internal/modules/esm/loader:291:45)
    at async link (node:internal/modules/esm/module_job:76:21) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}
        

            
            $ yarn add -D tsx
        

            
            import assert from 'assert/strict';
import test from 'node:test';

test('1 is equal to 1.', () => {
    assert.strictEqual(1, 1);
});
        

            
            $ node --loader tsx hoge.spec.ts
node:internal/process/esm_loader:40
      internalBinding('errors').triggerUncaughtException(
                                ^
Error: tsx must be loaded with --import instead of --loader
The --loader flag was deprecated in Node v20.6.0 and v18.19.0
    at z (file:///usr/src/app/node_modules/tsx/dist/esm/index.mjs:1:1773)
    at Hooks.addCustomLoader (node:internal/modules/esm/hooks:203:24)
    at Hooks.register (node:internal/modules/esm/hooks:169:16)
    at async initializeHooks (node:internal/modules/esm/utils:233:5)
    at async customizedModuleWorker (node:internal/modules/esm/worker:104:24)
        

            
            $ node --import tsx hoge.spec.ts
✔ 1 is equal to 1. (1.355371ms)
ℹ tests 1
ℹ suites 0
ℹ pass 1
ℹ fail 0
ℹ cancelled 0
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 13.941092
        

            
            $ mocha --import=tsx test/*.spec.ts
#...ユニットテストの内容は省略
  1 passing (7ms)

Done in 2.46s.