add esm

Author: aexol

.gitignore

@@ -7,6 +7,7 @@ build
 dist
 docs-dist
 lib
+esm
 .idea
 .docz
 .tscache

package.json

@@ -1,14 +1,15 @@
 {
   "name": "graphql-js-tree",
-  "version": "3.0.3",
+  "version": "3.0.4",
   "private": false,
   "license": "MIT",
   "description": "GraphQL Parser providing simplier structure",
   "homepage": "https://graphqleditor.com",
   "main": "lib/index.js",
+  "module": "esm/index.mjs",
   "types": "lib/index.d.ts",
   "scripts": {
-    "build": "tspc --build tsconfig.build.json",
+    "build": "tspc --build tsconfig.build.json && tspc --build tsconfig.build.esm.json && node scripts/fix-esm-extensions.js",
     "start": "tspc --build tsconfig.build.json --watch",
     "test": "jest",
     "lint": "tspc  && eslint \"./src/**/*.{ts,js}\" --quiet --fix"
@@ -41,5 +42,12 @@
   },
   "peerDependencies": {
     "graphql": "^16.0.0 || ^17.0.0"
+  },
+  "exports": {
+    ".": {
+      "types": "./lib/index.d.ts",
+      "require": "./lib/index.js",
+      "import": "./esm/index.mjs"
+    }
   }
 }

scripts/fix-esm-extensions.js

@@ -0,0 +1,87 @@
+// Post-build fixer for strict Node ESM support.
+// - Renames esm files from .js to .mjs
+// - Rewrites relative import/export specifiers to include explicit extensions
+//   and use .mjs (including directory index resolution)
+const fs = require('fs');
+const path = require('path');
+
+const esmRoot = path.resolve(__dirname, '..', 'esm');
+
+/** @param {string} p */
+function isDir(p) {
+  try {
+    return fs.statSync(p).isDirectory();
+  } catch {
+    return false;
+  }
+}
+
+/** @param {string} dir */
+function walk(dir) {
+  const entries = fs.readdirSync(dir, { withFileTypes: true });
+  /** @type {string[]} */
+  const files = [];
+  for (const e of entries) {
+    const full = path.join(dir, e.name);
+    if (e.isDirectory()) files.push(...walk(full));
+    else files.push(full);
+  }
+  return files;
+}
+
+function ensureRelativeWithExt(spec, fromFile) {
+  if (!spec.startsWith('./') && !spec.startsWith('../')) return spec; // external
+  // Normalize and resolve target on disk relative to fromFile
+  const fromDir = path.dirname(fromFile);
+  const raw = path.resolve(fromDir, spec);
+
+  // If spec already has an extension, normalize to .mjs when it points into esm
+  if (/\.(js|mjs|cjs)$/.test(spec)) {
+    // Convert .js to .mjs for intra-esm imports
+    return spec.replace(/\.js$/i, '.mjs');
+  }
+
+  // Try file.mjs
+  if (fs.existsSync(raw + '.mjs')) {
+    return spec + '.mjs';
+  }
+  // Try file.js (before rename step) or when resolving precomputed graph
+  if (fs.existsSync(raw + '.js')) {
+    return spec + '.mjs';
+  }
+  // Try directory index
+  if (isDir(raw)) {
+    if (fs.existsSync(path.join(raw, 'index.mjs'))) {
+      return spec.replace(/\/?$/, '/') + 'index.mjs';
+    }
+    if (fs.existsSync(path.join(raw, 'index.js'))) {
+      return spec.replace(/\/?$/, '/') + 'index.mjs';
+    }
+  }
+  // Fallback: append .mjs
+  return spec + '.mjs';
+}
+
+function rewriteFile(file) {
+  let code = fs.readFileSync(file, 'utf8');
+  // import ... from '...';  export ... from '...';  dynamic import('...')
+  code = code.replace(/(import\s+[^'"()]+?from\s*["'])([^"']+)(["'])/g, (m, a, s, b) => a + ensureRelativeWithExt(s, file) + b);
+  code = code.replace(/(export\s+[^'"()]+?from\s*["'])([^"']+)(["'])/g, (m, a, s, b) => a + ensureRelativeWithExt(s, file) + b);
+  code = code.replace(/(import\s*\(\s*["'])([^"']+)(["']\s*\))/g, (m, a, s, b) => a + ensureRelativeWithExt(s, file) + b);
+  fs.writeFileSync(file, code);
+}
+
+function main() {
+  if (!fs.existsSync(esmRoot)) return;
+  // First rename all .js files to .mjs to ensure ESM mode regardless of package type
+  const files = walk(esmRoot).filter((f) => f.endsWith('.js'));
+  // Rename leaf files first to avoid conflicts
+  for (const f of files.sort((a, b) => b.length - a.length)) {
+    fs.renameSync(f, f.slice(0, -3) + '.mjs');
+  }
+  // Now rewrite imports in all .mjs files
+  const mjsFiles = walk(esmRoot).filter((f) => f.endsWith('.mjs'));
+  for (const f of mjsFiles) rewriteFile(f);
+}
+
+main();

tsconfig.build.esm.json

@@ -0,0 +1,28 @@
+{
+  "compilerOptions": {
+    "target": "es6",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "experimentalDecorators": true,
+    "declaration": false,
+    "removeComments": true,
+    "noUnusedLocals": true,
+    "strictNullChecks": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "outDir": "./esm",
+    "lib": ["es6", "es7", "esnext", "dom"],
+    "rootDir": "./src",
+    "baseUrl": "./src/",
+    "paths": {
+      "@/*": ["./*"]
+    },
+    "plugins": [
+      {
+        "transform": "typescript-transform-paths"
+      }
+    ]
+  },
+  "exclude": ["lib", "esm", "node_modules", "docs", "**/__tests__", "generated", "examples", "**/*.spec.ts"]
+}
+