deploy full ESM with "type": "module" in "latest-esm" npm tag

.eslintignore

@@ -5,6 +5,7 @@
 /node_modules
 /reports
 /npmDist
+/npmEsmDist
 /denoDist
 /websiteDist
 

.eslintrc.yml

@@ -473,6 +473,10 @@ rules:
   yield-star-spacing: off
 
 overrides:
+  - files:
+      - 'integrationTests/node-esm/**/*.js'
+    parserOptions:
+      sourceType: module
   - files: '**/*.ts'
     parser: '@typescript-eslint/parser'
     parserOptions:

.gitignore

@@ -13,5 +13,6 @@
 /node_modules
 /reports
 /npmDist
+/npmEsmDist
 /denoDist
 /websiteDist

.prettierignore

@@ -6,5 +6,6 @@
 /node_modules
 /reports
 /npmDist
+/npmEsmDist
 /denoDist
 /websiteDist

integrationTests/node/index.js → integrationTests/node/index.mjs

@@ -2,13 +2,13 @@
 import assert from 'assert';
 import { readFileSync } from 'fs';
 
-import { graphqlSync } from 'graphql';
-import { buildSchema } from 'graphql/utilities';
-import { version } from 'graphql/version';
+import { graphqlSync } from 'graphql-esm';
+import { buildSchema } from 'graphql-esm/utilities';
+import { version } from 'graphql-esm/version';
 
 assert.deepStrictEqual(
-  version,
-  JSON.parse(readFileSync('./node_modules/graphql/package.json')).version,
+  version + '+esm',
+  JSON.parse(readFileSync('./node_modules/graphql-esm/package.json')).version,
 );
 
 const schema = buildSchema('type Query { hello: String }');

integrationTests/node/package.json

@@ -6,6 +6,7 @@
     "test": "node test.js"
   },
   "dependencies": {
-    "graphql": "file:../graphql.tgz"
+    "graphql": "file:../graphql.tgz",
+    "graphql-esm": "file:../graphql-esm.tgz"
   }
 }

integrationTests/node/test.js

@@ -14,7 +14,12 @@ for (const version of nodeVersions) {
   console.log(`Testing on node@${version} ...`);
 
   childProcess.execSync(
-    `docker run --rm --volume "$PWD":/usr/src/app -w /usr/src/app node:${version}-slim node ./index.js`,
+    `docker run --rm --volume "$PWD":/usr/src/app -w /usr/src/app node:${version}-slim node ./index.cjs`,
+    { stdio: 'inherit' },
+  );
+
+  childProcess.execSync(
+    `docker run --rm --volume "$PWD":/usr/src/app -w /usr/src/app node:${version}-slim node ./index.mjs`,
     { stdio: 'inherit' },
   );
 }

integrationTests/ts/esm.ts

@@ -0,0 +1,38 @@
+import type { ExecutionResult } from 'graphql-esm/execution';
+
+import { graphqlSync } from 'graphql-esm';
+import {
+  GraphQLString,
+  GraphQLSchema,
+  GraphQLObjectType,
+} from 'graphql-esm/type';
+
+const queryType: GraphQLObjectType = new GraphQLObjectType({
+  name: 'Query',
+  fields: () => ({
+    sayHi: {
+      type: GraphQLString,
+      args: {
+        who: {
+          type: GraphQLString,
+          defaultValue: 'World',
+        },
+      },
+      resolve(_root, args: { who: string }) {
+        return 'Hello ' + args.who;
+      },
+    },
+  }),
+});
+
+const schema: GraphQLSchema = new GraphQLSchema({ query: queryType });
+
+const result: ExecutionResult = graphqlSync({
+  schema,
+  source: `
+    query helloWho($who: String){
+      test(who: $who)
+    }
+  `,
+  variableValues: { who: 'Dolly' },
+});

integrationTests/ts/package.json

@@ -7,6 +7,7 @@
   },
   "dependencies": {
     "graphql": "file:../graphql.tgz",
+    "graphql-esm": "file:../graphql-esm.tgz",
     "typescript-4.4": "npm:[email protected]",
     "typescript-4.5": "npm:[email protected]",
     "typescript-4.6": "npm:[email protected]",

integrationTests/webpack/entry-esm.mjs

@@ -0,0 +1,13 @@
+// eslint-disable-next-line node/no-missing-import, import/no-unresolved
+import { graphqlSync } from 'graphql-esm';
+
+// eslint-disable-next-line node/no-missing-import, import/no-unresolved
+import { buildSchema } from 'graphql-esm/utilities/buildASTSchema';
+
+const schema = buildSchema('type Query { hello: String }');
+
+export const result = graphqlSync({
+  schema,
+  source: '{ hello }',
+  rootValue: { hello: 'world' },
+});

integrationTests/webpack/package.json

@@ -7,6 +7,7 @@
   },
   "dependencies": {
     "graphql": "file:../graphql.tgz",
+    "graphql-esm": "file:../graphql-esm.tgz",
     "webpack": "5.x.x",
     "webpack-cli": "4.x.x"
   }

integrationTests/webpack/test.js

@@ -1,11 +1,20 @@
 import assert from 'assert';
 
-import mainCJS from './dist/main.cjs';
+import cjs from './dist/main-cjs.cjs';
+import mjs from './dist/main-mjs.cjs';
 
-assert.deepStrictEqual(mainCJS.result, {
+assert.deepStrictEqual(cjs.result, {
   data: {
     __proto__: null,
     hello: 'world',
   },
 });
+
+assert.deepStrictEqual(mjs.result, {
+  data: {
+    __proto__: null,
+    hello: 'world',
+  },
+});
+
 console.log('Test script: Got correct result from Webpack bundle!');

integrationTests/webpack/webpack.config.json

@@ -1,8 +1,11 @@
 {
   "mode": "production",
-  "entry": "./entry.js",
+  "entry": {
+    "cjs": "./entry.js",
+    "mjs": "./entry-esm.mjs"
+  },
   "output": {
-    "filename": "main.cjs",
+    "filename": "main-[name].cjs",
     "library": {
       "type": "commonjs2"
     }

resources/build-npm.ts

@@ -4,6 +4,7 @@ import path from 'node:path';
 
 import ts from 'typescript';
 
+import { changeExtensionInImportPaths } from './change-extension-in-import-paths.js';
 import { inlineInvariant } from './inline-invariant.js';
 import {
   readPackageJSON,
@@ -12,17 +13,20 @@ import {
   writeGeneratedFile,
 } from './utils.js';
 
-buildPackage();
+console.log('\n./npmDist');
+buildPackage('./npmDist', false);
 showDirStats('./npmDist');
 
-function buildPackage() {
-  fs.rmSync('./npmDist', { recursive: true, force: true });
-  fs.mkdirSync('./npmDist');
+console.log('\n./npmEsmDist');
+buildPackage('./npmEsmDist', true);
+showDirStats('./npmEsmDist');
 
-  fs.copyFileSync('./LICENSE', './npmDist/LICENSE');
-  fs.copyFileSync('./README.md', './npmDist/README.md');
+function buildPackage(outDir: string, isESMOnly: boolean): void {
+  fs.rmSync(outDir, { recursive: true, force: true });
+  fs.mkdirSync(outDir);
 
-  const { emittedTSFiles } = emitTSFiles('./npmDist');
+  fs.copyFileSync('./LICENSE', `./${outDir}/LICENSE`);
+  fs.copyFileSync('./README.md', `./${outDir}/README.md`);
 
   const packageJSON = readPackageJSON();
 
@@ -39,7 +43,7 @@ function buildPackage() {
   // TODO: revisit once TS implements https://github.com/microsoft/TypeScript/issues/32166
   const notSupportedTSVersionFile = 'NotSupportedTSVersion.d.ts';
   fs.writeFileSync(
-    path.join('./npmDist', notSupportedTSVersionFile),
+    path.join(outDir, notSupportedTSVersionFile),
     // Provoke syntax error to show this message
     `"Package 'graphql' support only TS versions that are ${supportedTSVersions[0]}".`,
   );
@@ -49,19 +53,6 @@ function buildPackage() {
     '*': { '*': [notSupportedTSVersionFile] },
   };
 
-  packageJSON.exports = {};
-
-  for (const filepath of emittedTSFiles) {
-    if (path.basename(filepath) === 'index.js') {
-      const relativePath = './' + path.relative('./npmDist', filepath);
-      packageJSON.exports[path.dirname(relativePath)] = relativePath;
-    }
-  }
-
-  // Temporary workaround to allow "internal" imports, no grantees provided
-  packageJSON.exports['./*.js'] = './*.js';
-  packageJSON.exports['./*'] = './*.js';
-
   // TODO: move to integration tests
   const publishTag = packageJSON.publishConfig?.tag;
   assert(publishTag != null, 'Should have packageJSON.publishConfig defined!');
@@ -90,16 +81,51 @@ function buildPackage() {
     );
   }
 
+  if (isESMOnly) {
+    packageJSON.exports = {};
+
+    const { emittedTSFiles } = emitTSFiles({
+      outDir,
+      module: 'es2020',
+      extension: '.js',
+    });
+
+    for (const filepath of emittedTSFiles) {
+      if (path.basename(filepath) === 'index.js') {
+        const relativePath = './' + path.relative('./npmEsmDist', filepath);
+        packageJSON.exports[path.dirname(relativePath)] = relativePath;
+      }
+    }
+
+    // Temporary workaround to allow "internal" imports, no grantees provided
+    packageJSON.exports['./*.js'] = './*.js';
+    packageJSON.exports['./*'] = './*.js';
+
+    packageJSON.publishConfig.tag += '-esm';
+    packageJSON.version += '+esm';
+  } else {
+    delete packageJSON.type;
+    packageJSON.main = 'index';
+    packageJSON.module = 'index.mjs';
+    emitTSFiles({ outDir, module: 'commonjs', extension: '.js' });
+    emitTSFiles({ outDir, module: 'es2020', extension: '.mjs' });
+  }
+
   // Should be done as the last step so only valid packages can be published
-  writeGeneratedFile('./npmDist/package.json', JSON.stringify(packageJSON));
+  writeGeneratedFile(`./${outDir}/package.json`, JSON.stringify(packageJSON));
 }
 
 // Based on https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#getting-the-dts-from-a-javascript-file
-function emitTSFiles(outDir: string): {
+function emitTSFiles(options: {
+  outDir: string;
+  module: string;
+  extension: string;
+}): {
   emittedTSFiles: ReadonlyArray<string>;
 } {
+  const { outDir, module, extension } = options;
   const tsOptions = readTSConfig({
-    module: 'es2020',
+    module,
     noEmit: false,
     declaration: true,
     declarationDir: outDir,
@@ -108,11 +134,12 @@ function emitTSFiles(outDir: string): {
   });
 
   const tsHost = ts.createCompilerHost(tsOptions);
-  tsHost.writeFile = writeGeneratedFile;
+  tsHost.writeFile = (filepath, body) =>
+    writeGeneratedFile(filepath.replace(/.js$/, extension), body);
 
   const tsProgram = ts.createProgram(['src/index.ts'], tsOptions, tsHost);
   const tsResult = tsProgram.emit(undefined, undefined, undefined, undefined, {
-    after: [inlineInvariant],
+    after: [changeExtensionInImportPaths({ extension }), inlineInvariant],
   });
   assert(
     !tsResult.emitSkipped,

resources/integration-test.ts

@@ -11,10 +11,17 @@ describe('Integration Tests', () => {
   });
 
   npm().run('build:npm');
+
   const distDir = localRepoPath('npmDist');
   const archiveName = npm({ cwd: tmpDirPath(), quiet: true }).pack(distDir);
   fs.renameSync(tmpDirPath(archiveName), tmpDirPath('graphql.tgz'));
 
+  const esmDistDir = localRepoPath('npmEsmDist');
+  const archiveEsmName = npm({ cwd: tmpDirPath(), quiet: true }).pack(
+    esmDistDir,
+  );
+  fs.renameSync(tmpDirPath(archiveEsmName), tmpDirPath('graphql-esm.tgz'));
+
   npm().run('build:deno');
 
   function testOnNodeProject(projectName: string) {

resources/utils.ts

@@ -198,7 +198,11 @@ interface PackageJSON {
   types?: string;
   typesVersions: { [ranges: string]: { [path: string]: Array<string> } };
   devDependencies?: { [name: string]: string };
-  publishConfig?: { tag?: string };
+  publishConfig: { tag: string };
+
+  // TODO: remove after we drop CJS support
+  main?: string;
+  module?: string;
 }
 
 export function readPackageJSON(