fix: bring back support for jest

closes #137

.gitignore

@@ -103,7 +103,7 @@ dist-*
 # TernJS port file
 .tern-port
 
-# Facades
+# Simulated Package Exports
 scalars.d.ts
 scalars.js
 generator.d.ts

package.json

@@ -7,7 +7,11 @@
   "license": "MIT",
   "files": [
     "dist-cjs",
-    "dist-esm"
+    "dist-esm",
+    "scalars.d.ts",
+    "scalars.js",
+    "generator.d.ts",
+    "generator.js"
   ],
   "exports": {
     ".": {

scripts/simulatePackageExports.ts

@@ -0,0 +1,55 @@
+/**
+ * Simualated Module Exports
+ *
+ * This script builds the modules that will be consumed publically. They front the actual code inside ./dist.
+ * The problem being solved here is that it allows consumers to do e.g. this:
+ *
+ *     Import { ... } from 'nexus/testing'
+ *
+ * Instead of:
+ *
+ *     Import { ... } from 'nexus/dist/testing'
+ *
+ * This is needed to support Jest: https://github.com/prisma/nexus-prisma/issues/137
+ *
+ * Whatever modules are written here should be:
+ *
+ * 1. ignored in .gitignore.                     <-- YOU MUST DO THIS MANUALLY
+ * 2. added to the package.json files array      <-- Automated for you
+ */
+
+// TODO automate gitignore step
+
+import * as fs from 'fs-jetpack'
+import * as lo from 'lodash'
+import * as os from 'os'
+import * as path from 'path'
+import { PackageJson } from 'type-fest'
+
+simulatePackageExports([
+  ['scalars.d.ts', "export * from './dist-cjs/entrypoints/scalars'"],
+  ['scalars.js', "module.exports = require('./dist-cjs/entrypoints/scalars')"],
+  ['generator.d.ts', "export * from './dist-cjs/entrypoints/generator'"],
+  ['generator.js', "module.exports = require('./dist-cjs/entrypoints/generator')"],
+])
+
+function simulatePackageExports(facades: ModuleFacade[]) {
+  // Write facade files
+
+  for (const facade of facades) {
+    fs.write(facade[0], facade[1] + os.EOL)
+  }
+
+  // Handle package.json files array
+
+  const packageJsonPath = path.join(__dirname, '..', 'package.json')
+  const packageJson = fs.read(packageJsonPath, 'json') as PackageJson
+
+  packageJson.files = lo.uniq([...(packageJson.files ?? []), ...facades.map((facade) => facade[0])])
+
+  const packageJsonString = JSON.stringify(packageJson, null, 2) + os.EOL
+
+  fs.write(packageJsonPath, packageJsonString)
+}
+
+type ModuleFacade = [filePath: string, fileContents: string]