Merge pull request #39 from contentstack/staging

oclif v4 upgrade, add jest and add user input validation for launch:function port

Author: Chhavi-Mandowara

.gitignore

@@ -16,3 +16,4 @@ dependabot.yml
 /bkp
 .editorconfig
 /functions
+coverage/

jest.config.js

@@ -0,0 +1,24 @@
+/**
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+/** @type {import('jest').Config} */
+const config = {
+  // Indicates whether the coverage information should be collected while executing the test
+  collectCoverage: false,
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: 'coverage',
+
+  // Indicates which provider should be used to instrument code for coverage
+  coverageProvider: 'v8',
+
+  // A preset that is used as a base for Jest's configuration
+  preset: 'ts-jest',
+
+  // The glob patterns Jest uses to detect test files
+  testMatch: ['**/src/**/?(*.)+(spec|test).[tj]s?(x)'],
+};
+
+module.exports = config;