.

qwen/nodejs/node_modules/pg/lib/index.js

@@ -0,0 +1,64 @@
+'use strict'
+
+const Client = require('./client')
+const defaults = require('./defaults')
+const Connection = require('./connection')
+const Result = require('./result')
+const utils = require('./utils')
+const Pool = require('pg-pool')
+const TypeOverrides = require('./type-overrides')
+const { DatabaseError } = require('pg-protocol')
+const { escapeIdentifier, escapeLiteral } = require('./utils')
+
+const poolFactory = (Client) => {
+  return class BoundPool extends Pool {
+    constructor(options) {
+      super(options, Client)
+    }
+  }
+}
+
+const PG = function (clientConstructor) {
+  this.defaults = defaults
+  this.Client = clientConstructor
+  this.Query = this.Client.Query
+  this.Pool = poolFactory(this.Client)
+  this._pools = []
+  this.Connection = Connection
+  this.types = require('pg-types')
+  this.DatabaseError = DatabaseError
+  this.TypeOverrides = TypeOverrides
+  this.escapeIdentifier = escapeIdentifier
+  this.escapeLiteral = escapeLiteral
+  this.Result = Result
+  this.utils = utils
+}
+
+if (typeof process.env.NODE_PG_FORCE_NATIVE !== 'undefined') {
+  module.exports = new PG(require('./native'))
+} else {
+  module.exports = new PG(Client)
+
+  // lazy require native module...the native module may not have installed
+  Object.defineProperty(module.exports, 'native', {
+    configurable: true,
+    enumerable: false,
+    get() {
+      let native = null
+      try {
+        native = new PG(require('./native'))
+      } catch (err) {
+        if (err.code !== 'MODULE_NOT_FOUND') {
+          throw err
+        }
+      }
+
+      // overwrite module.exports.native so that getter is never called again
+      Object.defineProperty(module.exports, 'native', {
+        value: native,
+      })
+
+      return native
+    },
+  })
+}