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类型错误:笑话:转换必须导出“process”函数笑话

运行“npm test”时出现以下错误:

\n
 FAIL  __tests__/unit/domain/services/demo-service.ts\n  \xe2\x97\x8f Test suite failed to run\n\n    TypeError: Jest: a transform must export a `process` function.\n\n      at ScriptTransformer._getTransformer (node_modules/@jest/transform/build/ScriptTransformer.js:357:15)\n      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:419:28)\n      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:523:40)\n      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:579:25)\n
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