Replace mocha & nyc & istanbul for jest

Get ride of copied RuleTester

Author: jerone

.eslintignore

@@ -1,4 +1,3 @@
-.nyc_output/
 coverage/
 dist/
 node_modules/

.eslintrc.json

@@ -16,7 +16,7 @@
       "parser": "@typescript-eslint/parser",
       "env": {
         "node": true,
-        "mocha": true
+        "jest": true
       },
       "extends": [
         "eslint:recommended",

.mocharc.json

@@ -1,4 +1,3 @@
-.nyc_output/
 coverage/
 dist/
 node_modules/

.nycrc

@@ -4,7 +4,6 @@
    */
   // Exclude files/folders from searching in VS Code.
   "search.exclude": {
-    ".nyc_output": true,
     "coverage": true,
     "dist": true,
     "node_modules": true

.prettierignore

@@ -0,0 +1,17 @@
+/** @type {import('ts-jest').InitialOptionsTsJest} */
+module.exports = {
+  preset: "ts-jest",
+  collectCoverage: true,
+  coverageDirectory: "coverage",
+  coverageReporters: ["text", "text-summary", "lcov", "cobertura"],
+  collectCoverageFrom: [
+    "src/**/*.ts",
+    "!**/node_modules/**",
+    "!**/external/**",
+  ],
+  globals: {
+    "ts-jest": {
+      tsconfig: "tsconfig.test.json",
+    },
+  },
+};