test: adds a test for resolveJsonModule in TS 2.9

tests/__tests__/import-json.spec.ts

@@ -0,0 +1,9 @@
+import runJest from '../__helpers__/runJest';
+
+describe('Import JSON with `resolveJsonModule`', () => {
+  it('should work as expected', () => {
+    const result = runJest('../import-json', ['--no-cache']);
+
+    expect(result.status).toBe(0);
+  });
+});

tests/import-json/.gitignore

@@ -0,0 +1 @@
+coverage

tests/import-json/__tests__/pkg.test.ts

@@ -0,0 +1,9 @@
+declare var jest, describe, it, expect;
+
+import pkg from '../pkg';
+
+describe('pkg', () => {
+  it('should statically import package.json', () => {
+    expect(pkg).toEqual(require('../package.json'));
+  });
+});

tests/import-json/package.json

@@ -0,0 +1,15 @@
+{
+  "jest": {
+    "transform": {
+      "^.+\\.tsx?$": "ts-jest"
+    },
+    "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
+    "moduleFileExtensions": [
+      "ts",
+      "tsx",
+      "js",
+      "jsx",
+      "json"
+    ]
+  }
+}

tests/import-json/pkg.ts

@@ -0,0 +1,3 @@
+import * as pkg from './package';
+
+export default pkg;

tests/import-json/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "compilerOptions": {
+    "resolveJsonModule": true
+  }
+}