fix: dedupe SMTP recipients before send

Closes eleith#242.

package.json

@@ -8,15 +8,17 @@
  "Hiverness",
  "mscdex",
  "jimmybergman",
- "zackschuster"
+ "zackschuster",
+ "Yuping Zuo (https:/zypA13510)"
  ],
  "repository": {
  "type": "git",
  "url": "http:/eleith/emailjs.git"
  },
  "dependencies": {
  "addressparser": "^0.3.2",
- "emailjs-mime-codec": "^2.0.7"
+ "emailjs-mime-codec": "^2.0.7",
+ "lodash.unionwith": "^4.6.0"
  },
  "devDependencies": {
  "chai": "^4.1.2",
@@ -37,8 +39,8 @@
  ],
  "main": "email.js",
  "scripts": {
- "rollup": "rollup -c rollup.config.js && npm run rollup:test",
- "rollup:test": "npm run test -- --file rollup/email.bundle.test.js",
+ "rollup": "rollup -c rollup.config.js && npm run rollup:test",
+ "rollup:test": "npm run test -- --file rollup/email.bundle.test.js",
  "test": "mocha"
  },
  "license": "MIT",

smtp/client.js

@@ -1,6 +1,9 @@
 const { SMTP, state } = require('./smtp');
 const { Message, create } = require('./message');
 const addressparser = require('addressparser');
+const _ = {
+ unionWith: require('lodash.unionwith'),
+};
 
 class Client {
  /**
@@ -95,11 +98,11 @@ class Client {
  };
 
  if (message.header.cc) {
- stack.to = stack.to.concat(addressparser(message.header.cc));
+ stack.to = _.unionWith(stack.to, addressparser(message.header.cc), (x, y) => x.address === y.address);
  }
 
  if (message.header.bcc) {
- stack.to = stack.to.concat(addressparser(message.header.bcc));
+ stack.to = _.unionWith(stack.to, addressparser(message.header.bcc), (x, y) => x.address === y.address);
  }
 
  if (

yarn.lock

@@ -892,6 +892,11 @@ [email protected]:
  dependencies:
  uc.micro "^1.0.1"
 
+lodash.unionwith@^4.6.0:
+ version "4.6.0"
+ resolved "https://registry.yarnpkg.com/lodash.unionwith/-/lodash.unionwith-4.6.0.tgz#74d140b5ca8146e6c643c3724f5152538d9ac1f0"
+ integrity sha1-dNFAtcqBRubGQ8NyT1FSU42awfA=
+
 lodash@^4.17.4, lodash@^4.17.5, lodash@^4.3.0:
  version "4.17.10"
  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"