diff --git a/.eslintrc b/.eslintrc
index bb77004ec..fd9bb8ddc 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,5 +1,5 @@
 {
-  "plugins": ["prettier"],
+  "plugins": ["@typescript-eslint", "prettier"],
   "parser": "@typescript-eslint/parser",
   "extends": ["plugin:prettier/recommended", "prettier"],
   "ignorePatterns": ["node_modules", "coverage", "packages/pg-protocol/dist/**/*", "packages/pg-query-stream/dist/**/*"],
@@ -11,5 +11,11 @@
     "node": true,
     "es6": true,
     "mocha": true
+  },
+  "rules": {
+    "@typescript-eslint/no-unused-vars": ["error", {
+      "args": "none"
+    }],
+    "no-unused-vars": "off"
   }
 }
diff --git a/packages/pg-protocol/src/b.ts b/packages/pg-protocol/src/b.ts
index 028b76393..088ca1857 100644
--- a/packages/pg-protocol/src/b.ts
+++ b/packages/pg-protocol/src/b.ts
@@ -1,13 +1,10 @@
 // file for microbenchmarking
 
-import { Writer } from './buffer-writer'
-import { serialize } from './index'
 import { BufferReader } from './buffer-reader'
 
 const LOOPS = 1000
 let count = 0
 let start = Date.now()
-const writer = new Writer()
 
 const reader = new BufferReader()
 const buffer = Buffer.from([33, 33, 33, 33, 33, 33, 33, 0])
diff --git a/packages/pg-protocol/src/inbound-parser.test.ts b/packages/pg-protocol/src/inbound-parser.test.ts
index 364bd8d95..0c905c501 100644
--- a/packages/pg-protocol/src/inbound-parser.test.ts
+++ b/packages/pg-protocol/src/inbound-parser.test.ts
@@ -14,17 +14,6 @@ var parseCompleteBuffer = buffers.parseComplete()
 var bindCompleteBuffer = buffers.bindComplete()
 var portalSuspendedBuffer = buffers.portalSuspended()
 
-var addRow = function (bufferList: BufferList, name: string, offset: number) {
-  return bufferList
-    .addCString(name) // field name
-    .addInt32(offset++) // table id
-    .addInt16(offset++) // attribute of column number
-    .addInt32(offset++) // objectId of field's data type
-    .addInt16(offset++) // datatype size
-    .addInt32(offset++) // type modifier
-    .addInt16(0) // format code, 0 => text
-}
-
 var row1 = {
   name: 'id',
   tableID: 1,
diff --git a/packages/pg-protocol/src/index.ts b/packages/pg-protocol/src/index.ts
index 00491ff7f..703ff2e49 100644
--- a/packages/pg-protocol/src/index.ts
+++ b/packages/pg-protocol/src/index.ts
@@ -1,4 +1,4 @@
-import { BackendMessage, DatabaseError } from './messages'
+import { DatabaseError } from './messages'
 import { serialize } from './serializer'
 import { Parser, MessageCallback } from './parser'
 
diff --git a/packages/pg-protocol/src/parser.ts b/packages/pg-protocol/src/parser.ts
index 1ad4e3abd..5a3b0f6be 100644
--- a/packages/pg-protocol/src/parser.ts
+++ b/packages/pg-protocol/src/parser.ts
@@ -27,7 +27,6 @@ import {
   NoticeMessage,
 } from './messages'
 import { BufferReader } from './buffer-reader'
-import assert from 'assert'
 
 // every message is prefixed with a single bye
 const CODE_LENGTH = 1
diff --git a/packages/pg-query-stream/test/async-iterator.ts b/packages/pg-query-stream/test/async-iterator.ts
index e2f8a7552..227a9ec9a 100644
--- a/packages/pg-query-stream/test/async-iterator.ts
+++ b/packages/pg-query-stream/test/async-iterator.ts
@@ -122,9 +122,11 @@ if (!process.version.startsWith('v8')) {
       const pool = new pg.Pool({ max: 1 })
       const client = await pool.connect()
 
+      /* eslint-disable @typescript-eslint/no-unused-vars */
       for await (const _ of client.query(new QueryStream('select TRUE', [], { highWaterMark: 1 }))) break
       for await (const _ of client.query(new QueryStream('select TRUE', [], { highWaterMark: 1 }))) break
       for await (const _ of client.query(new QueryStream('select TRUE', [], { highWaterMark: 1 }))) break
+      /* eslint-enable @typescript-eslint/no-unused-vars */
 
       client.release()
       await pool.end()
diff --git a/packages/pg-query-stream/test/pauses.ts b/packages/pg-query-stream/test/pauses.ts
index 75fee57f6..4906341f8 100644
--- a/packages/pg-query-stream/test/pauses.ts
+++ b/packages/pg-query-stream/test/pauses.ts
@@ -2,7 +2,7 @@ import helper from './helper'
 import concat from 'concat-stream'
 import JSONStream from 'JSONStream'
 import QueryStream from '../src'
-import { Transform, TransformCallback } from 'stream'
+import { Transform } from 'stream'
 
 class PauseStream extends Transform {
   constructor() {
diff --git a/packages/pg/test/integration/client/appname-tests.js b/packages/pg/test/integration/client/appname-tests.js
index ab7202a9b..ae05c7e72 100644
--- a/packages/pg/test/integration/client/appname-tests.js
+++ b/packages/pg/test/integration/client/appname-tests.js
@@ -27,7 +27,6 @@ function getAppName(conf, cb) {
 }
 
 suite.test('No default appliation_name ', function (done) {
-  var conf = getConInfo()
   getAppName({}, function (res) {
     assert.strictEqual(res, '')
     done()
diff --git a/packages/pg/test/integration/client/big-simple-query-tests.js b/packages/pg/test/integration/client/big-simple-query-tests.js
index b0dc252f6..acc9fe7f8 100644
--- a/packages/pg/test/integration/client/big-simple-query-tests.js
+++ b/packages/pg/test/integration/client/big-simple-query-tests.js
@@ -92,8 +92,7 @@ process.on('exit', function () {
 })
 
 var runBigQuery = function (client) {
-  var rows = []
-  var q = client.query(
+  client.query(
     "select 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' as bla from person where name = $1 or 1 = 1",
     [''],
     function (err, result) {
diff --git a/packages/pg/test/integration/client/error-handling-tests.js b/packages/pg/test/integration/client/error-handling-tests.js
index 4e879c9e0..19dc961cf 100644
--- a/packages/pg/test/integration/client/error-handling-tests.js
+++ b/packages/pg/test/integration/client/error-handling-tests.js
@@ -1,7 +1,6 @@
 'use strict'
 
 var helper = require('./test-helper')
-var util = require('util')
 
 var pg = helper.pg
 const Client = pg.Client
@@ -113,7 +112,7 @@ var ensureFuture = function (testClient, done) {
 suite.test('when query is parsing', (done) => {
   var client = createErorrClient()
 
-  var q = client.query({ text: 'CREATE TEMP TABLE boom(age integer); INSERT INTO boom (age) VALUES (28);' })
+  client.query({ text: 'CREATE TEMP TABLE boom(age integer); INSERT INTO boom (age) VALUES (28);' })
 
   // this query wont parse since there isn't a table named bang
   var query = client.query(
@@ -131,7 +130,7 @@ suite.test('when query is parsing', (done) => {
 suite.test('when a query is binding', function (done) {
   var client = createErorrClient()
 
-  var q = client.query({ text: 'CREATE TEMP TABLE boom(age integer); INSERT INTO boom (age) VALUES (28);' })
+  client.query({ text: 'CREATE TEMP TABLE boom(age integer); INSERT INTO boom (age) VALUES (28);' })
 
   var query = client.query(
     new pg.Query({
diff --git a/packages/pg/test/integration/client/multiple-results-tests.js b/packages/pg/test/integration/client/multiple-results-tests.js
index c27295103..89c9f0057 100644
--- a/packages/pg/test/integration/client/multiple-results-tests.js
+++ b/packages/pg/test/integration/client/multiple-results-tests.js
@@ -33,7 +33,7 @@ suite.test(
 
     // TODO should be text or sql?
     try {
-      const results = yield client.query({
+      yield client.query({
         text: `SELECT 'foo'::text as name; SELECT 'bar'::text as baz`,
         queryMode: 'extended',
       })
diff --git a/packages/pg/test/integration/client/no-data-tests.js b/packages/pg/test/integration/client/no-data-tests.js
index ad0f22be3..1a27e2ae4 100644
--- a/packages/pg/test/integration/client/no-data-tests.js
+++ b/packages/pg/test/integration/client/no-data-tests.js
@@ -5,7 +5,7 @@ const suite = new helper.Suite()
 suite.test('noData message handling', function () {
   var client = helper.client()
 
-  var q = client.query({
+  client.query({
     name: 'boom',
     text: 'create temp table boom(id serial, size integer)',
   })
@@ -29,7 +29,7 @@ suite.test('noData message handling', function () {
     values: [101],
   })
 
-  var query = client.query(
+  client.query(
     {
       name: 'fetch',
       text: 'select size from boom where size < $1',
diff --git a/packages/pg/test/integration/client/prepared-statement-tests.js b/packages/pg/test/integration/client/prepared-statement-tests.js
index ebc1f7380..ce58373ca 100644
--- a/packages/pg/test/integration/client/prepared-statement-tests.js
+++ b/packages/pg/test/integration/client/prepared-statement-tests.js
@@ -9,7 +9,6 @@ var suite = new helper.Suite()
   client.on('drain', client.end.bind(client))
 
   var queryName = 'user by age and like name'
-  var parseCount = 0
 
   suite.test('first named prepared statement', function (done) {
     var query = client.query(
@@ -89,7 +88,7 @@ var suite = new helper.Suite()
   var client2 = helper.client()
 
   suite.test('client 1 execution', function (done) {
-    var query = client1.query(
+    client1.query(
       {
         name: statementName,
         text: statement1,
diff --git a/packages/pg/test/integration/client/result-metadata-tests.js b/packages/pg/test/integration/client/result-metadata-tests.js
index 66d9ac4ae..e7f02dee5 100644
--- a/packages/pg/test/integration/client/result-metadata-tests.js
+++ b/packages/pg/test/integration/client/result-metadata-tests.js
@@ -19,7 +19,7 @@ new helper.Suite().test('should return insert metadata', function () {
               assert.equal(result.oid, null)
               assert.equal(result.command, 'CREATE')
 
-              var q = client.query(
+              client.query(
                 "INSERT INTO zugzug(name) VALUES('more work?')",
                 assert.calls(function (err, result) {
                   assert(!err)
diff --git a/packages/pg/test/integration/client/results-as-array-tests.js b/packages/pg/test/integration/client/results-as-array-tests.js
index 5ebb2a9d5..40dc40cc2 100644
--- a/packages/pg/test/integration/client/results-as-array-tests.js
+++ b/packages/pg/test/integration/client/results-as-array-tests.js
@@ -23,7 +23,7 @@ test('returns results as array', function () {
         values: ['hai'],
         rowMode: 'array',
       }
-      var query = client.query(
+      client.query(
         config,
         assert.success(function (result) {
           assert.equal(result.rows.length, 1)
diff --git a/packages/pg/test/integration/client/simple-query-tests.js b/packages/pg/test/integration/client/simple-query-tests.js
index d22d74742..ff81a968a 100644
--- a/packages/pg/test/integration/client/simple-query-tests.js
+++ b/packages/pg/test/integration/client/simple-query-tests.js
@@ -18,6 +18,7 @@ test('simple query interface', function () {
   query.once('row', function (row) {
     test('Can iterate through columns', function () {
       var columnCount = 0
+      // eslint-disable-next-line @typescript-eslint/no-unused-vars
       for (var column in row) {
         columnCount++
       }
diff --git a/packages/pg/test/integration/client/type-coercion-tests.js b/packages/pg/test/integration/client/type-coercion-tests.js
index 9abb31347..f03ff397b 100644
--- a/packages/pg/test/integration/client/type-coercion-tests.js
+++ b/packages/pg/test/integration/client/type-coercion-tests.js
@@ -14,7 +14,7 @@ var testForTypeCoercion = function (type) {
           assert(!err)
 
           type.values.forEach(function (val) {
-            var insertQuery = client.query(
+            client.query(
               'insert into test_type(col) VALUES($1)',
               [val],
               assert.calls(function (err, result) {
@@ -135,8 +135,6 @@ if (helper.config.binary) {
   })
 }
 
-var valueCount = 0
-
 types.forEach(function (type) {
   testForTypeCoercion(type)
 })
diff --git a/packages/pg/test/integration/connection-pool/error-tests.js b/packages/pg/test/integration/connection-pool/error-tests.js
index f3f9cdcaa..a012dce34 100644
--- a/packages/pg/test/integration/connection-pool/error-tests.js
+++ b/packages/pg/test/integration/connection-pool/error-tests.js
@@ -18,7 +18,6 @@ suite.test('errors emitted on checked-out clients', (cb) => {
       client.query('SELECT NOW()', function () {
         pool.connect(
           assert.success(function (client2, done2) {
-            var pidColName = 'procpid'
             helper.versionGTE(
               client2,
               90200,
diff --git a/packages/pg/test/integration/connection/copy-tests.js b/packages/pg/test/integration/connection/copy-tests.js
index 177009d00..7e0aeddd4 100644
--- a/packages/pg/test/integration/connection/copy-tests.js
+++ b/packages/pg/test/integration/connection/copy-tests.js
@@ -4,7 +4,7 @@ var assert = require('assert')
 
 test('COPY FROM events check', function () {
   helper.connect(function (con) {
-    var stdinStream = con.query('COPY person FROM STDIN')
+    con.query('COPY person FROM STDIN')
     con.on('copyInResponse', function () {
       con.endCopyFrom()
     })
@@ -28,7 +28,7 @@ test('COPY FROM events check', function () {
 })
 test('COPY TO events check', function () {
   helper.connect(function (con) {
-    var stdoutStream = con.query('COPY person TO STDOUT')
+    con.query('COPY person TO STDOUT')
     assert.emits(con, 'copyOutResponse', function () {}, 'backend should emit copyOutResponse after COPY TO query')
     assert.emits(con, 'copyData', function () {}, 'backend should emit copyData on every data row')
     assert.emits(
diff --git a/packages/pg/test/integration/connection/test-helper.js b/packages/pg/test/integration/connection/test-helper.js
index 475f30333..a36023402 100644
--- a/packages/pg/test/integration/connection/test-helper.js
+++ b/packages/pg/test/integration/connection/test-helper.js
@@ -2,7 +2,6 @@
 var net = require('net')
 var helper = require('../test-helper')
 var Connection = require('../../../lib/connection')
-var utils = require('../../../lib/utils')
 const crypto = require('../../../lib/crypto/utils')
 var connect = function (callback) {
   var username = helper.args.user
diff --git a/packages/pg/test/integration/domain-tests.js b/packages/pg/test/integration/domain-tests.js
index a90880bcd..07453d000 100644
--- a/packages/pg/test/integration/domain-tests.js
+++ b/packages/pg/test/integration/domain-tests.js
@@ -29,7 +29,7 @@ suite.test('with domain', function (cb) {
       assert.success(function (client, done) {
         assert(process.domain, 'no domain exists in connect callback')
         assert.equal(startingDomain, process.domain, 'domain was lost when checking out a client')
-        var query = client.query(
+        client.query(
           'SELECT NOW()',
           assert.success(function () {
             assert(process.domain, 'no domain exists in query callback')
diff --git a/packages/pg/test/integration/gh-issues/1542-tests.js b/packages/pg/test/integration/gh-issues/1542-tests.js
index f65aa3fb6..6ad075b22 100644
--- a/packages/pg/test/integration/gh-issues/1542-tests.js
+++ b/packages/pg/test/integration/gh-issues/1542-tests.js
@@ -17,6 +17,6 @@ suite.testAsync('BoundPool can be subclassed', async () => {
 suite.test('calling pg.Pool without new throws', () => {
   const Pool = helper.pg.Pool
   assert.throws(() => {
-    const pool = Pool()
+    Pool()
   })
 })
diff --git a/packages/pg/test/integration/gh-issues/2064-tests.js b/packages/pg/test/integration/gh-issues/2064-tests.js
index 6118ca2f4..0878b7941 100644
--- a/packages/pg/test/integration/gh-issues/2064-tests.js
+++ b/packages/pg/test/integration/gh-issues/2064-tests.js
@@ -25,7 +25,6 @@ suite.test('Password should not exist in util.inspect output', () => {
 suite.test('Password should not exist in json.stringfy output', () => {
   const pool = new helper.pg.Pool({ password })
   const client = new helper.pg.Client({ password })
-  const depth = 20
   assert(JSON.stringify(pool).indexOf(password) === -1)
   assert(JSON.stringify(client).indexOf(password) === -1)
 })
diff --git a/packages/pg/test/integration/gh-issues/2303-tests.js b/packages/pg/test/integration/gh-issues/2303-tests.js
index 7496a6f6c..533ae1645 100644
--- a/packages/pg/test/integration/gh-issues/2303-tests.js
+++ b/packages/pg/test/integration/gh-issues/2303-tests.js
@@ -25,7 +25,6 @@ suite.test('SSL Key should not exist in util.inspect output', () => {
 suite.test('SSL Key should not exist in json.stringfy output', () => {
   const pool = new helper.pg.Pool({ ssl: { key: secret_value } })
   const client = new helper.pg.Client({ ssl: { key: secret_value } })
-  const depth = 20
   assert(JSON.stringify(pool).indexOf(secret_value) === -1)
   assert(JSON.stringify(client).indexOf(secret_value) === -1)
 })
diff --git a/packages/pg/test/unit/client/early-disconnect-tests.js b/packages/pg/test/unit/client/early-disconnect-tests.js
index 494482845..cd3df3b69 100644
--- a/packages/pg/test/unit/client/early-disconnect-tests.js
+++ b/packages/pg/test/unit/client/early-disconnect-tests.js
@@ -1,5 +1,5 @@
 'use strict'
-var helper = require('./test-helper')
+require('./test-helper')
 var net = require('net')
 var pg = require('../../../lib/index.js')
 
diff --git a/packages/pg/test/unit/client/prepared-statement-tests.js b/packages/pg/test/unit/client/prepared-statement-tests.js
index 2499808f7..8ffc69721 100644
--- a/packages/pg/test/unit/client/prepared-statement-tests.js
+++ b/packages/pg/test/unit/client/prepared-statement-tests.js
@@ -90,9 +90,7 @@ test('bound command', function () {
 
 var portalClient = helper.client()
 var portalCon = portalClient.connection
-var portalParseArg = null
 portalCon.parse = function (arg) {
-  portalParseArg = arg
   process.nextTick(function () {
     portalCon.emit('parseComplete')
   })
diff --git a/packages/pg/test/unit/client/query-queue-tests.js b/packages/pg/test/unit/client/query-queue-tests.js
index 0b5eaa564..04f18a3e9 100644
--- a/packages/pg/test/unit/client/query-queue-tests.js
+++ b/packages/pg/test/unit/client/query-queue-tests.js
@@ -1,5 +1,5 @@
 'use strict'
-var helper = require('./test-helper')
+require('./test-helper')
 var Connection = require('../../../lib/connection')
 
 test('drain', function () {
diff --git a/packages/pg/test/unit/client/result-metadata-tests.js b/packages/pg/test/unit/client/result-metadata-tests.js
index a5e6542c8..9c69639da 100644
--- a/packages/pg/test/unit/client/result-metadata-tests.js
+++ b/packages/pg/test/unit/client/result-metadata-tests.js
@@ -6,7 +6,7 @@ var testForTag = function (tagText, callback) {
     var client = helper.client()
     client.connection.emit('readyForQuery')
 
-    var query = client.query(
+    client.query(
       'whatever',
       assert.calls((err, result) => {
         assert.ok(result != null, 'should pass something to this event')
diff --git a/packages/pg/test/unit/client/stream-and-query-error-interaction-tests.js b/packages/pg/test/unit/client/stream-and-query-error-interaction-tests.js
index 892d2e87a..57b7abcf7 100644
--- a/packages/pg/test/unit/client/stream-and-query-error-interaction-tests.js
+++ b/packages/pg/test/unit/client/stream-and-query-error-interaction-tests.js
@@ -1,5 +1,5 @@
 'use strict'
-var helper = require('./test-helper')
+require('./test-helper')
 var Connection = require('../../../lib/connection')
 var Client = require('../../../lib/client')
 
diff --git a/packages/pg/test/unit/client/throw-in-type-parser-tests.js b/packages/pg/test/unit/client/throw-in-type-parser-tests.js
index 8f71fdc02..8bfdba4e9 100644
--- a/packages/pg/test/unit/client/throw-in-type-parser-tests.js
+++ b/packages/pg/test/unit/client/throw-in-type-parser-tests.js
@@ -32,7 +32,6 @@ const emitFakeEvents = (con) => {
 }
 
 suite.test('emits error', function (done) {
-  var handled
   var client = helper.client()
   var con = client.connection
   var query = client.query(new Query('whatever'))
@@ -45,14 +44,10 @@ suite.test('emits error', function (done) {
 })
 
 suite.test('calls callback with error', function (done) {
-  var handled
-
-  var callbackCalled = 0
-
   var client = helper.client()
   var con = client.connection
   emitFakeEvents(con)
-  var query = client.query('whatever', function (err) {
+  client.query('whatever', function (err) {
     assert.equal(err, typeParserError)
     done()
   })
diff --git a/packages/pg/test/unit/connection-parameters/creation-tests.js b/packages/pg/test/unit/connection-parameters/creation-tests.js
index a4a837f3b..5225b9773 100644
--- a/packages/pg/test/unit/connection-parameters/creation-tests.js
+++ b/packages/pg/test/unit/connection-parameters/creation-tests.js
@@ -344,7 +344,6 @@ suite.test('ssl is set on client', function () {
       sslrootcert: '/path/root.crt',
     },
   }
-  var Client = require('../../../lib/client')
   var defaults = require('../../../lib/defaults')
   defaults.ssl = true
   var c = new ConnectionParameters(sourceConfig)
diff --git a/packages/pg/test/unit/utils-tests.js b/packages/pg/test/unit/utils-tests.js
index 5eca7179f..300bbea6e 100644
--- a/packages/pg/test/unit/utils-tests.js
+++ b/packages/pg/test/unit/utils-tests.js
@@ -183,7 +183,6 @@ test('prepareValue: Uint8Array array prepared properly', function () {
 })
 
 test('prepareValue: objects with complex toPostgres prepared properly', function () {
-  var buf = Buffer.from('zomgcustom!')
   var customType = {
     toPostgres: function () {
       return [1, 2]
@@ -214,7 +213,6 @@ test('prepareValue: objects with toPostgres receive prepareValue', function () {
 })
 
 test('prepareValue: objects with circular toPostgres rejected', function () {
-  var buf = Buffer.from('zomgcustom!')
   var customType = {
     toPostgres: function () {
       return {