Fix import syntax for commonJS in documentation (brianc#3191)

Author: brianc

docs/pages/announcements.mdx

@@ -116,7 +116,8 @@ pg@7.1.2
 To demonstrate the issue & see if you are vunerable execute the following in node:
 
 ```js
-import { Client } from 'pg'
+import pg from 'pg'
+const { Client } = pg
 const client = new Client()
 client.connect()
 

docs/pages/apis/client.mdx

@@ -29,7 +29,8 @@ type Config = {
 example to create a client with specific connection information:
 
 ```js
-import { Client } from 'pg'
+import pg from 'pg'
+const { Client } = pg
 
 const client = new Client({
  host: 'my.database-server.com',
@@ -43,7 +44,8 @@ const client = new Client({
 ## client.connect
 
 ```js
-import { Client } from 'pg'
+import pg from 'pg'
+const { Client } = pg
 const client = new Client()
 
 await client.connect()
@@ -82,7 +84,8 @@ client.query(text: string, values?: any[]) => Promise<Result>
 **Plain text query**
 
 ```js
-import { Client } from 'pg'
+import pg from 'pg'
+const { Client } = pg
 const client = new Client()
 
 await client.connect()
@@ -96,7 +99,8 @@ await client.end()
 **Parameterized query**
 
 ```js
-import { Client } from 'pg'
+import pg from 'pg'
+const { Client } = pg
 const client = new Client()
 
 await client.connect()
@@ -134,7 +138,8 @@ await client.end()
 If you pass an object to `client.query` and the object has a `.submit` function on it, the client will pass it's PostgreSQL server connection to the object and delegate query dispatching to the supplied object. This is an advanced feature mostly intended for library authors. It is incidentally also currently how the callback and promise based queries above are handled internally, but this is subject to change. It is also how [pg-cursor](https://github.com/brianc/node-pg-cursor) and [pg-query-stream](https://github.com/brianc/node-pg-query-stream) work.
 
 ```js
-import { Query } from 'pg'
+import pg from 'pg'
+const { Query } = pg
 const query = new Query('select $1::text as name', ['brianc'])
 
 const result = client.query(query)

docs/pages/apis/cursor.mdx

@@ -18,7 +18,8 @@ $ npm install pg pg-cursor
 Instantiates a new Cursor. A cursor is an instance of `Submittable` and should be passed directly to the `client.query` method.
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 import Cursor from 'pg-cursor'
 
 const pool = new Pool()
@@ -57,7 +58,8 @@ If the cursor has read to the end of the result sets all subsequent calls to cur
 Here is an example of reading to the end of a cursor:
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 import Cursor from 'pg-cursor'
 
 const pool = new Pool()

docs/pages/apis/pool.mdx

@@ -48,7 +48,8 @@ type Config = {
 example to create a new pool with configuration:
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool({
  host: 'localhost',
@@ -68,7 +69,8 @@ pool.query(text: string, values?: any[]) => Promise<pg.Result>
 ```
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 
@@ -100,7 +102,8 @@ Acquires a client from the pool.
 - If the pool is 'full' and all clients are currently checked out will wait in a FIFO queue until a client becomes available by it being released back to the pool.
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 
@@ -118,7 +121,8 @@ Client instances returned from `pool.connect` will have a `release` method which
 The `release` method on an acquired client returns it back to the pool. If you pass a truthy value in the `destroy` parameter, instead of releasing the client to the pool, the pool will be instructed to disconnect and destroy this client, leaving a space within itself for a new client.
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 
@@ -130,7 +134,8 @@ client.release()
 ```
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 assert(pool.totalCount === 0)
@@ -163,7 +168,8 @@ Calling `pool.end` will drain the pool of all active clients, disconnect them, a
 
 ```js
 // again both promises and callbacks are supported:
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 

docs/pages/apis/result.mdx

@@ -18,7 +18,8 @@ Every result will have a rows array. If no rows are returned the array will be e
 Every result will have a fields array. This array contains the `name` and `dataTypeID` of each field in the result. These fields are ordered in the same order as the columns if you are using `arrayMode` for the query:
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 

docs/pages/features/connecting.mdx

@@ -7,7 +7,8 @@ title: Connecting
 node-postgres uses the same [environment variables](https://www.postgresql.org/docs/9.1/static/libpq-envars.html) as libpq and psql to connect to a PostgreSQL server. Both individual clients & pools will use these environment variables. Here's a tiny program connecting node.js to the PostgreSQL server:
 
 ```js
-import { Pool, Client } from 'pg'
+import pg from 'pg'
+const { Pool, Client } = pg
 
 // pools will use environment variables
 // for connection information
@@ -54,7 +55,8 @@ PGPORT=5432
 node-postgres also supports configuring a pool or client programmatically with connection information. Here's our same script from above modified to use programmatic (hard-coded in this case) values. This can be useful if your application already has a way to manage config values or you don't want to use environment variables.
 
 ```js
-import { Pool, Client } from 'pg'
+import pg from 'pg'
+const { Pool, Client } = pg
 
 const pool = new Pool({
  user: 'dbuser',
@@ -84,7 +86,8 @@ await client.end()
 Many cloud providers include alternative methods for connecting to database instances using short-lived authentication tokens. node-postgres supports dynamic passwords via a callback function, either synchronous or asynchronous. The callback function must resolve to a string.
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 import { RDS } from 'aws-sdk'
 
 const signerOptions = {
@@ -116,7 +119,8 @@ const pool = new Pool({
 Connections to unix sockets can also be made. This can be useful on distros like Ubuntu, where authentication is managed via the socket connection instead of a password.
 
 ```js
-import { Client } from 'pg'
+import pg from 'pg'
+const { Client } = pg
 client = new Client({
  host: '/cloudsql/myproject:zone:mydb',
  user: 'username',
@@ -130,7 +134,8 @@ client = new Client({
 You can initialize both a pool and a client with a connection string URI as well. This is common in environments like Heroku where the database connection string is supplied to your application dyno through an environment variable. Connection string parsing brought to you by [pg-connection-string](https://github.com/brianc/node-postgres/tree/master/packages/pg-connection-string).
 
 ```js
-import { Pool, Client } from 'pg'
+import pg from 'pg'
+const { Pool, Client } = pg
 const connectionString = 'postgresql://dbuser:secretpassword@database.server.com:3211/mydb'
 
 const pool = new Pool({

docs/pages/features/native.mdx

@@ -15,7 +15,8 @@ $ npm install pg pg-native
 Once `pg-native` is installed instead of requiring a `Client` or `Pool` constructor from `pg` you do the following:
 
 ```js
-import { native } from 'pg'
+import pg from 'pg'
+const { native } = pg
 const { Client, Pool } = native
 ```
 

docs/pages/features/pooling.mdx

@@ -28,7 +28,8 @@ The client pool allows you to have a reusable pool of clients you can check out,
 ### Checkout, use, and return
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 
@@ -60,7 +61,8 @@ client.release()
 If you don't need a transaction or you just need to run a single query, the pool has a convenience method to run a query on any available client in the pool. This is the preferred way to query with node-postgres if you can as it removes the risk of leaking a client.
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 
 const pool = new Pool()
 
@@ -73,7 +75,8 @@ console.log('user:', res.rows[0])
 To shut down a pool call `pool.end()` on the pool. This will wait for all checked-out clients to be returned and then shut down all the clients and the pool timers.
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 const pool = new Pool()
 
 console.log('starting async query')

docs/pages/features/ssl.mdx

@@ -22,7 +22,8 @@ const config = {
  },
 }
 
-import { Client, Pool } from 'pg'
+import pg from 'pg'
+const { Client, Pool } = pg
 
 const client = new Client(config)
 await client.connect()

docs/pages/features/transactions.mdx

@@ -16,7 +16,8 @@ To execute a transaction with node-postgres you simply execute `BEGIN / COMMIT /
 ## Examples
 
 ```js
-import { Pool } from 'pg'
+import pg from 'pg'
+const { Pool } = pg
 const pool = new Pool()
 
 const client = await pool.connect()
@@ -36,4 +37,4 @@ try {
 } finally {
  client.release()
 }
-```
+```