First passing test.

.gitignore

@@ -0,0 +1,7 @@
+/.idea
+/coverage
+/lib
+/node_modules
+/package-lock.json
+/yarn.lock
+

.npmignore

@@ -0,0 +1,2 @@
+/coverage
+/node_modules

README.md

@@ -0,0 +1 @@
+Demo how to use Jest in Typescript projects.

__tests__/base.spec.ts

@@ -0,0 +1,9 @@
+import {sampleFunction } from "../src";
+
+describe("This is a simple test", () => {
+  test("Check the sampleFunction function", () => {
+    const actual = sampleFunction("hello");
+    const expected = "hellohello";
+    expect(actual).toEqual(expected);
+  });
+});

jest.config.js

@@ -0,0 +1,20 @@
+module.exports = {
+  collectCoverage: true,
+  moduleFileExtensions: [
+    "ts",
+    "tsx",
+    "js",
+    "jsx",
+    "json",
+    "node",
+  ],
+  testPathIgnorePatterns: [
+    "<rootDir>/lib/",
+    "<rootDir>/node_modules/",
+  ],
+  // Accept anything called .(spec|test).[js]jx? in __tests__ or root (or /lib).
+  testRegex: "(/__tests__/.*|(\\.|/)(spec|test))\\.(jsx?|tsx?)$",
+  transform: {
+    "^.+\\.tsx?$": "ts-jest",
+  }
+};

package.json

@@ -0,0 +1,21 @@
+{
+  "author": "Michael Tiller",
+  "description": "Demo how to use Jest with Typescript code",
+  "devDependencies": {
+    "@types/jest": "^23.3.1",
+    "jest": "^23.5.0",
+    "ts-jest": "^23.1.3",
+    "tslint": "^5.11.0",
+    "typescript": "^3.0.1"
+  },
+  "license": "MIT",
+  "main": "index.js",
+  "name": "typescript",
+  "private": false,
+  "repository": "https://medium.com/@mtiller/debugging-with-typescript-jest-ts-jest-and-visual-studio-code-ef9ca8644132",
+  "scripts": {
+    "compile": "tsc",
+    "test": "jest"
+  },
+  "version": "1.0.0"
+}

src/index.ts

@@ -0,0 +1,3 @@
+export function sampleFunction(x: string): string {
+    return x + x;
+}

tsconfig.json

@@ -0,0 +1,73 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    "target": "es5",
+    /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "module": "commonjs",
+    /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./lib",
+    /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,
+    /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    "noUnusedLocals": true,
+    /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    "noImplicitReturns": true,
+    /* Report error when not all code paths in function return a value. */
+    "noFallthroughCasesInSwitch": true,
+    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true
+    /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+  },
+  // "files": [ "." ],
+
+  "exclude": [
+    "lib",
+    "node_modules"
+  ]
+}

tslint.json

@@ -0,0 +1,9 @@
+{
+  "defaultSeverity": "error",
+  "extends": [
+    "tslint:recommended"
+  ],
+  "jsRules": {},
+  "rules": {},
+  "rulesDirectory": []
+}