ESM CJS + Jest

.eslintrc.yml

@@ -4,6 +4,7 @@ parserOptions:
 env:
   es6: true
   node: true
+  jest: true
 plugins:
   - import
 

.travis.yml

@@ -31,8 +31,5 @@ script:
   - npm install graphql@$GRAPHQL_VERSION
   - npm run testonly:cover
 
-after_success:
-  - npm run coverage
-
 # Allow Travis tests to run in containers.
 sudo: false

jest.config.js

@@ -0,0 +1,19 @@
+const { resolve } = require('path');
+const CI = !!process.env.CI;
+
+module.exports = {
+  transform: { '^.+\\.tsx?$': 'ts-jest' },
+  testEnvironment: 'node',
+  rootDir: process.cwd(),
+  globals: {
+    'ts-jest': {
+      diagnostics: false,
+      tsConfig: 'tsconfig.json'
+    }
+  },
+  restoreMocks: true,
+  reporters: ['default'],
+  modulePathIgnorePatterns: ['dist'],
+  collectCoverage: CI,
+  collectCoverageFrom: ['src', '!src/test']
+};

package.json

@@ -2,28 +2,28 @@
   "name": "graphql-tools",
   "version": "5.0.0-alpha.0",
   "description": "Useful tools to create and manipulate GraphQL schemas.",
-  "main": "dist/index.js",
+  "sideEffects": false,
+  "main": "dist/index.cjs.js",
+  "module": "dist/index.esm.js",
   "types": "dist/index.d.ts",
+  "typings": "dist/index.d.ts",
+  "typescript": {
+    "definition": "dist/index.d.ts"
+  },
   "files": [
     "/dist",
     "!/dist/test"
   ],
-  "sideEffects": false,
   "scripts": {
     "clean": "rimraf dist",
     "build": "npm run compile",
     "precompile": "npm run clean",
-    "compile": "tsc",
-    "pretest": "npm run clean && npm run compile",
-    "test": "npm run testonly",
+    "compile": "rollup -c rollup.config.js",
+    "test": "jest",
     "posttest": "npm run lint && npm run prettier:check",
     "lint": "eslint --ext .js,.ts src",
     "lint:watch": "esw --watch --cache --ext .js,.ts src",
-    "watch": "tsc -w",
-    "testonly": "mocha --reporter spec --full-trace ./dist/test/**.js --require source-map-support/register",
-    "testonly:cover": "nyc npm run testonly",
-    "testonly:watch": "mocha -w --reporter spec --full-trace ./dist/test/**.js --require source-map-support/register",
-    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "watch": "npm run compile -- --watch",
     "prepublishOnly": "npm run compile",
     "prettier": "prettier --trailing-comma all --single-quote --write src/**/*.ts",
     "prettier:check": "prettier --trailing-comma all --single-quote --check src/**/*.ts"
@@ -63,21 +63,20 @@
     "graphql": "^0.12.0 || ^0.13.0 || ^14.0.0 || ^15.0.0-rc"
   },
   "devDependencies": {
-    "@types/chai": "4.2.11",
+    "@rollup/plugin-node-resolve": "7.1.1",
     "@types/dateformat": "3.0.1",
     "@types/express": "4.17.3",
     "@types/extract-files": "3.1.0",
     "@types/graphql-type-json": "0.3.2",
     "@types/graphql-upload": "8.0.3",
-    "@types/mocha": "7.0.2",
+    "@types/jest": "25.1.4",
     "@types/node": "13.9.3",
     "@types/node-fetch": "2.5.5",
     "@types/uuid": "7.0.2",
     "@typescript-eslint/eslint-plugin": "2.25.0",
     "@typescript-eslint/parser": "2.25.0",
     "babel-eslint": "10.1.0",
     "body-parser": "1.19.0",
-    "chai": "4.2.0",
     "coveralls": "3.0.11",
     "dataloader": "2.0.0",
     "dateformat": "3.0.3",
@@ -90,11 +89,14 @@
     "graphql-subscriptions": "1.1.0",
     "graphql-type-json": "0.3.1",
     "graphql-upload": "10.0.0",
-    "mocha": "7.1.1",
-    "nyc": "15.0.0",
+    "jest": "25.2.4",
     "prettier": "2.0.2",
     "rimraf": "3.0.2",
+    "rollup": "2.3.1",
+    "rollup-plugin-auto-external": "2.0.0",
+    "rollup-plugin-typescript2": "0.27.0",
     "source-map-support": "0.5.16",
+    "ts-jest": "25.3.0",
     "typescript": "3.8.3",
     "zen-observable-ts": "0.8.20"
   }

rollup.config.js

@@ -0,0 +1,30 @@
+import rollup from 'rollup';
+import autoExternal from 'rollup-plugin-auto-external';
+import resolveNode from '@rollup/plugin-node-resolve';
+import rollupTypescript from 'rollup-plugin-typescript2';
+
+const commonOutputOptions = {
+  preferConst: true,
+  sourcemap: true
+};
+
+export default {
+  input: 'src/index.ts',
+  plugins: [
+    resolveNode(),
+    autoExternal({ builtins: true, dependencies: true, peerDependencies: true }),
+    rollupTypescript()
+  ],
+  output: [
+    {
+      ...commonOutputOptions,
+      file: 'dist/index.cjs.js',
+      format: 'cjs'
+    },
+    {
+      ...commonOutputOptions,
+      file: 'dist/index.esm.js',
+      format: 'esm'
+    }
+  ]
+};