first commit

jest.config.js

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+module.exports = {
+  moduleFileExtensions: ['js', 'json', 'ts'],
+  rootDir: '.',
+  testEnvironment: 'node',
+  testRegex: '.*\\.spec\\.ts$',
+  transform: {
+    '^.+\\.(t|j)s$': 'ts-jest',
+  },
+  collectCoverageFrom: ['src/**/*.(t|j)s'],
+  coverageDirectory: './coverage',
+};