working version of using the pg commonjs library

Author: Urigo

.gitignore

@@ -1,3 +1,3 @@
 node_modules
 yarn.lock
-.vscode
+.vscode

README.md

@@ -27,4 +27,5 @@ Would love suggestions on how to make it better or to point to a better example!
 1. Install latest Node (Notice that I've placed the `engines` field on `package.json` so try to make sure you have the exact version or simply delete it from `package.json`
 2. Install dependencies - `yarn`
 3. Compile with `tsc -w` and run Node with `nodemon` - `yarn dev`
-4. You can also use `yarn compile` and `yarn start` separately
+4. You can also use `yarn compile` and `yarn start` separately
+

dist/index.js

@@ -5,9 +5,12 @@
     "dev": "concurrently \"tsc -w\" \"nodemon --es-module-specifier-resolution=node dist/index.js\"",
     "build": "tsc"
   },
-  "dependencies": {},
+  "dependencies": {
+    "pg": "7.17.1"
+  },
   "devDependencies": {
     "@types/node": "13.1.8",
+    "@types/pg": "7.14.1",
     "concurrently": "5.0.2",
     "nodemon": "2.0.2",
     "typescript": "3.8.0-beta"

dist/index.js.map

@@ -2,4 +2,33 @@ import { printSomething } from './anotherFile';
 
 console.log('hello world');
 
-printSomething('new string from function in another file');
+printSomething('new string from function in another file');
+
+// Node says that when importing from commonjs you only can bring 
+// const pg = require('pg'); // That works is we change Typescript and Node to use regular commonjs
+// import * as pg from 'pg'; // Won't work as this does equal this that:
+import pg from 'pg';
+const { Pool } = pg;
+
+async function main() {
+
+  const pool = new Pool({
+    user: "postgres",
+    host: "localhost",
+    database: "test",
+    password: "test",
+    port: 5432
+  });
+  
+  // second bonus is to try to move this into Top level await
+  let res = await pool.query(`
+    SELECT 1+1
+  `);
+  
+  console.log(res.rows[0]);
+}
+
+main()
+    .catch(e => console.error(e));
+
+

package.json

@@ -4,7 +4,9 @@
     "target": "es2020",
     "strict": true,
     "sourceMap": true,
-    "outDir": "dist"
+    "outDir": "dist",
+    "moduleResolution": "node", // Needed for npm modules that use commonjs
+    "allowSyntheticDefaultImports": true // So we can import default value from node_modules https://stackoverflow.com/a/54302557/1426570
   },
   "include": ["src/**/*"]
 }