ep 013

_new/013-es-modules/commonjs/index.js

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+const fs = require('fs');
+const crypto = require('crypto');
+
+const util = require('./util');
+
+(async () => {
+    let contents = await util.open('package.json');
+
+    console.log(contents);
+})();

_new/013-es-modules/commonjs/package.json

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+{
+    "description": "i'm a commonjs app"
+}

_new/013-es-modules/commonjs/util.js

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+const fs = require('fs/promises');
+
+module.exports = {
+
+    async open(file) {
+        let content = await fs.readFile(file);
+
+        return content.toString();
+    }
+
+};

_new/013-es-modules/esm/index.js

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+import fs from 'fs';
+import crypto from 'crypto';
+
+import util from './util.js';
+
+let contents = await util.open('package.json');
+
+console.log(contents);

_new/013-es-modules/esm/package.json

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+{
+    "type": "module",
+    "description": "i'm an esm app"
+}

_new/013-es-modules/esm/util.js

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+import fs from 'fs/promises';
+
+export default {
+
+    async open(file) {
+        let content = await fs.readFile(file);
+
+        return content.toString();
+    }
+
+};

_new/013-es-modules/notes.txt

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+prereqs:
+    - upgrade to at least node 12, 16 preferred
+
+how to go esm:
+    - add "type": "module" to package.json
+    - change out calls to require() with import
+    - change out module.exports to export default
+    - remove top level self-executing functions
+    - remove 'use strict'; from everywhere
+
+caveats:
+    - the above steps get you 90% the way
+
+import * as url from 'url';
+const __filename = url.fileURLToPath(import.meta.url);
+const __dirname = url.fileURLToPath(new URL('.', import.meta.url));