fix: unit test (#170)

* refactor: rewrite to pure function

* build(deps-dev): bump jest & ts-jest deps

* chore: add coverage reports

.gitattributes

@@ -5,3 +5,5 @@
 *.png binary
 *.gif binary
 *.ico binary
+
+package-lock.json merge=theirs

.gitignore

@@ -18,6 +18,9 @@ dist/
 # Local files
 *.local
 
+# Test Coverage
+coverage/
+
 # Playwright
 /test-results/
 /playwright-report/

jest.config.ts

@@ -1,15 +1,12 @@
 /*
- * For a detailed explanation regarding each configuration property, visit:
+ * For a detailed explanation regarding each configuration property and type check, visit:
  * https://jestjs.io/docs/configuration
  */
 
-/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
 export default {
   // All imported modules in your tests should be mocked automatically
   // automock: false,
 
-  "extensionsToTreatAsEsm": [".ts"],
-
   // Stop running tests after `n` failures
   // bail: 0,
 
@@ -20,13 +17,13 @@ export default {
   // clearMocks: false,
 
   // Indicates whether the coverage information should be collected while executing the test
-  // collectCoverage: false,
+  collectCoverage: true,
 
   // An array of glob patterns indicating a set of files for which coverage information should be collected
   // collectCoverageFrom: undefined,
 
   // The directory where Jest should output its coverage files
-  // coverageDirectory: undefined,
+  coverageDirectory: "coverage",
 
   // An array of regexp pattern strings used to skip coverage collection
   // coveragePathIgnorePatterns: [
@@ -68,11 +65,7 @@ export default {
   // globalTeardown: undefined,
 
   // A set of global variables that need to be available in all test environments
-  globals: {
-    'ts-jest': {
-      useESM: true,
-    },
-  },
+  // globals: {},
 
   // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
   // maxWorkers: "50%",