diff --git a/package.json b/package.json
index b13849700c..928806f17b 100644
--- a/package.json
+++ b/package.json
@@ -32,9 +32,10 @@
     "coveralls": "^3.0.0",
     "eslint": "^5.16.0",
     "eslint-config-prettier": "^4.1.0",
+    "eslint-plugin-chai-friendly": "^0.4.0",
     "eslint-plugin-flowtype": "^3.4.2",
     "eslint-plugin-prettier": "^3.0.1",
-    "eslint-plugin-chai-friendly": "^0.4.0",
+    "lebab": "^3.0.5",
     "mocha": "~5.0.5",
     "nock": "^9.0.0",
     "nyc": "^11.3.0",
diff --git a/run-lebab.sh b/run-lebab.sh
new file mode 100755
index 0000000000..56009aa312
--- /dev/null
+++ b/run-lebab.sh
@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+set -eu -o pipefail
+
+transforms=(
+  "arrow"
+  "for-of"
+  "for-each"
+  "arg-rest"
+  "arg-spread"
+  "obj-method"
+  "obj-shorthand"
+  "multi-var"
+  "let"
+  "template"
+  "default-param"
+  "destruct-param"
+  "includes"
+)
+
+# don't want lebab to operate on these, too slow.
+
+for transform in "${transforms[@]}"; do
+  echo
+  echo "$transform"
+  
+  commit_message="lebab transform: $transform"
+  
+  commit_message_regex=' '$commit_message"[[:>:]]"
+  if [[ "$(git log -20 --oneline)" =~ $commit_message_regex ]]; then
+    echo "skipping because commit exists"
+    continue
+  fi
+
+  yarn lebab -t "$transform" --replace "lib/"
+  yarn lebab -t "$transform" --replace "test/"
+  yarn lebab -t "$transform" --replace "testUtils/"
+  yarn lebab -t "$transform" --replace "examples/"
+  yarn fix
+
+  yarn mocha
+  git add -A .
+  git commit --allow-empty -m "$commit_message"
+  echo "Done with $transform"
+  echo
+done
+
+git push
diff --git a/yarn.lock b/yarn.lock
index a4902128f6..2e48e77aca 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -95,7 +95,7 @@ acorn-jsx@^5.0.0:
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.0.1.tgz#32a064fd925429216a09b141102bfdd185fae40e"
   integrity sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==
 
-acorn@^6.0.7:
+acorn@^6.0.2, acorn@^6.0.7:
   version "6.1.1"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.1.tgz#7d25ae05bb8ad1f9b699108e1094ecd7884adc1f"
   integrity sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==
@@ -220,6 +220,11 @@ assign-symbols@^1.0.0:
   resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
   integrity sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=
 
+ast-types@0.11.5:
+  version "0.11.5"
+  resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.11.5.tgz#9890825d660c03c28339f315e9fa0a360e31ec28"
+  integrity sha512-oJjo+5e7/vEc2FBK8gUalV0pba4L3VdBIs2EKhOLHLcOd2FgQIVQN9xb0eZ9IjEWyAL7vq6fGJxOvVvdCHNyMw==
+
 astral-regex@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-1.0.0.tgz#6c8c3fb827dd43ee3918f27b82782ab7658a6fd9"
@@ -567,7 +572,7 @@ commander@2.11.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.11.0.tgz#157152fd1e7a6c8d98a5b715cf376df928004563"
   integrity sha512-b0553uYA5YAEGgyYIGYROzKQ7X5RAqedkfjiZxwi0kL1g3bOaBNNZfYkzt/CL0umgD5wc9Jec2FbB98CjkMRvQ==
 
-commander@~2.20.0:
+commander@^2.15.1, commander@~2.20.0:
   version "2.20.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
   integrity sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==
@@ -649,6 +654,13 @@ cross-spawn@^6.0.5:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
+d@1:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/d/-/d-1.0.0.tgz#754bb5bfe55451da69a58b94d45f4c5b0462d58f"
+  integrity sha1-dUu1v+VUUdpppYuU1F9MWwRi1Y8=
+  dependencies:
+    es5-ext "^0.10.9"
+
 dashdash@^1.12.0:
   version "1.14.1"
   resolved "https://registry.yarnpkg.com/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"
@@ -789,11 +801,80 @@ error-ex@^1.2.0:
   dependencies:
     is-arrayish "^0.2.1"
 
+es5-ext@^0.10.14, es5-ext@^0.10.35, es5-ext@^0.10.9, es5-ext@~0.10.14:
+  version "0.10.50"
+  resolved "https://registry.yarnpkg.com/es5-ext/-/es5-ext-0.10.50.tgz#6d0e23a0abdb27018e5ac4fd09b412bc5517a778"
+  integrity sha512-KMzZTPBkeQV/JcSQhI5/z6d9VWJ3EnQ194USTUwIYZ2ZbpN8+SGXQKt1h68EX44+qt+Fzr8DO17vnxrw7c3agw==
+  dependencies:
+    es6-iterator "~2.0.3"
+    es6-symbol "~3.1.1"
+    next-tick "^1.0.0"
+
+es6-iterator@^2.0.1, es6-iterator@~2.0.1, es6-iterator@~2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/es6-iterator/-/es6-iterator-2.0.3.tgz#a7de889141a05a94b0854403b2d0a0fbfa98f3b7"
+  integrity sha1-p96IkUGgWpSwhUQDstCg+/qY87c=
+  dependencies:
+    d "1"
+    es5-ext "^0.10.35"
+    es6-symbol "^3.1.1"
+
+es6-map@^0.1.3:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/es6-map/-/es6-map-0.1.5.tgz#9136e0503dcc06a301690f0bb14ff4e364e949f0"
+  integrity sha1-kTbgUD3MBqMBaQ8LsU/042TpSfA=
+  dependencies:
+    d "1"
+    es5-ext "~0.10.14"
+    es6-iterator "~2.0.1"
+    es6-set "~0.1.5"
+    es6-symbol "~3.1.1"
+    event-emitter "~0.3.5"
+
+es6-set@~0.1.5:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/es6-set/-/es6-set-0.1.5.tgz#d2b3ec5d4d800ced818db538d28974db0a73ccb1"
+  integrity sha1-0rPsXU2ADO2BjbU40ol02wpzzLE=
+  dependencies:
+    d "1"
+    es5-ext "~0.10.14"
+    es6-iterator "~2.0.1"
+    es6-symbol "3.1.1"
+    event-emitter "~0.3.5"
+
+es6-symbol@3.1.1, es6-symbol@^3.1.1, es6-symbol@~3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/es6-symbol/-/es6-symbol-3.1.1.tgz#bf00ef4fdab6ba1b46ecb7b629b4c7ed5715cc77"
+  integrity sha1-vwDvT9q2uhtG7Le2KbTH7VcVzHc=
+  dependencies:
+    d "1"
+    es5-ext "~0.10.14"
+
+es6-weak-map@^2.0.1:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/es6-weak-map/-/es6-weak-map-2.0.2.tgz#5e3ab32251ffd1538a1f8e5ffa1357772f92d96f"
+  integrity sha1-XjqzIlH/0VOKH45f+hNXdy+S2W8=
+  dependencies:
+    d "1"
+    es5-ext "^0.10.14"
+    es6-iterator "^2.0.1"
+    es6-symbol "^3.1.1"
+
 escape-string-regexp@1.0.5, escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
   integrity sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
 
+escope@^3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/escope/-/escope-3.6.0.tgz#e01975e812781a163a6dadfdd80398dc64c889c3"
+  integrity sha1-4Bl16BJ4GhY6ba392AOY3GTIicM=
+  dependencies:
+    es6-map "^0.1.3"
+    es6-weak-map "^2.0.1"
+    esrecurse "^4.1.0"
+    estraverse "^4.1.1"
+
 eslint-config-prettier@^4.1.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-4.2.0.tgz#70b946b629cd0e3e98233fd9ecde4cb9778de96c"
@@ -888,6 +969,15 @@ eslint@^5.16.0:
     table "^5.2.3"
     text-table "^0.2.0"
 
+espree@^4.0.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/espree/-/espree-4.1.0.tgz#728d5451e0fd156c04384a7ad89ed51ff54eb25f"
+  integrity sha512-I5BycZW6FCVIub93TeVY1s7vjhP9CY6cXCznIRfiig7nRviKZYdRnj/sHEWC6A7WE9RDWOFq9+7OsWSYz8qv2w==
+  dependencies:
+    acorn "^6.0.2"
+    acorn-jsx "^5.0.0"
+    eslint-visitor-keys "^1.0.0"
+
 espree@^5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/espree/-/espree-5.0.1.tgz#5d6526fa4fc7f0788a5cf75b15f30323e2f81f7a"
@@ -897,7 +987,7 @@ espree@^5.0.1:
     acorn-jsx "^5.0.0"
     eslint-visitor-keys "^1.0.0"
 
-esprima@^4.0.0:
+esprima@^4.0.0, esprima@~4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.1.tgz#13b04cdb3e6c5d19df91ab6987a8695619b0aa71"
   integrity sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==
@@ -926,6 +1016,14 @@ esutils@^2.0.2:
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
   integrity sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=
 
+event-emitter@~0.3.5:
+  version "0.3.5"
+  resolved "https://registry.yarnpkg.com/event-emitter/-/event-emitter-0.3.5.tgz#df8c69eef1647923c7157b9ce83840610b02cc39"
+  integrity sha1-34xp7vFkeSPHFXuc6DhAYQsCzDk=
+  dependencies:
+    d "1"
+    es5-ext "~0.10.14"
+
 execa@^0.7.0:
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/execa/-/execa-0.7.0.tgz#944becd34cc41ee32a63a9faf27ad5a65fc59777"
@@ -1026,6 +1124,13 @@ extsprintf@^1.2.0:
   resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.4.0.tgz#e2689f8f356fad62cca65a3a91c5df5f9551692f"
   integrity sha1-4mifjzVvrWLMplo6kcXfX5VRaS8=
 
+f-matches@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/f-matches/-/f-matches-1.1.0.tgz#18e98545000bf381007b7a9f99a69eed0d304336"
+  integrity sha1-GOmFRQAL84EAe3qfmaae7Q0wQzY=
+  dependencies:
+    lodash "^4.17.5"
+
 fast-deep-equal@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
@@ -1787,6 +1892,20 @@ lcov-parse@^0.0.10:
   resolved "https://registry.yarnpkg.com/lcov-parse/-/lcov-parse-0.0.10.tgz#1b0b8ff9ac9c7889250582b70b71315d9da6d9a3"
   integrity sha1-GwuP+ayceIklBYK3C3ExXZ2m2aM=
 
+lebab@^3.0.5:
+  version "3.0.5"
+  resolved "https://registry.yarnpkg.com/lebab/-/lebab-3.0.5.tgz#7e8517be78b744eb3595d81715bede7d7820075a"
+  integrity sha512-LbcBBIEJHFSGajEBc0/kcrB6be+4hArcIJaa/46Nt15ULqQG0Y+skbrdjy7w9NJz4hLPJsKHRDIoEsM7inuh8A==
+  dependencies:
+    commander "^2.15.1"
+    escope "^3.6.0"
+    espree "^4.0.0"
+    estraverse "^4.1.1"
+    f-matches "^1.1.0"
+    glob "^7.1.2"
+    lodash "^4.17.11"
+    recast "^0.15.5"
+
 levn@^0.3.0, levn@~0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/levn/-/levn-0.3.0.tgz#3b09924edf9f083c0490fdd4c0bc4421e04764ee"
@@ -2037,6 +2156,11 @@ neo-async@^2.6.0:
   resolved "https://registry.yarnpkg.com/neo-async/-/neo-async-2.6.0.tgz#b9d15e4d71c6762908654b5183ed38b753340835"
   integrity sha512-MFh0d/Wa7vkKO3Y3LlacqAEeHK0mckVqzDieUKTT+KGxi+zIpeVsFxymkIiRpbpDziHc290Xr9A1O4Om7otoRA==
 
+next-tick@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/next-tick/-/next-tick-1.0.0.tgz#ca86d1fe8828169b0120208e3dc8424b9db8342c"
+  integrity sha1-yobR/ogoFpsBICCOPchCS524NCw=
+
 nice-try@^1.0.4:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
@@ -2368,6 +2492,11 @@ prettier@^1.16.4:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.17.0.tgz#53b303676eed22cc14a9f0cec09b477b3026c008"
   integrity sha512-sXe5lSt2WQlCbydGETgfm1YBShgOX4HxQkFPvbxkcwgDvGDeqVau8h+12+lmSVlP3rHPz0oavfddSZg/q+Szjw==
 
+private@~0.1.5:
+  version "0.1.8"
+  resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"
+  integrity sha512-VvivMrbvd2nKkiG38qjULzlc+4Vx4wm/whI9pQD35YrARNnhxeiRktSOhSukRLFNlzg6Br/cJPet5J/u19r/mg==
+
 progress@^2.0.0:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/progress/-/progress-2.0.3.tgz#7e8cf8d8f5b8f239c1bc68beb4eb78567d572ef8"
@@ -2434,6 +2563,16 @@ read-pkg@^1.0.0:
     normalize-package-data "^2.3.2"
     path-type "^1.0.0"
 
+recast@^0.15.5:
+  version "0.15.5"
+  resolved "https://registry.yarnpkg.com/recast/-/recast-0.15.5.tgz#6871177ee26720be80d7624e4283d5c855a5cb0b"
+  integrity sha512-nkAYNqarh73cMWRKFiPQ8I9dOLFvFk6SnG8u/LUlOYfArDOD/EjsVRAs860TlBLrpxqAXHGET/AUAVjdEymL5w==
+  dependencies:
+    ast-types "0.11.5"
+    esprima "~4.0.0"
+    private "~0.1.5"
+    source-map "~0.6.1"
+
 regenerator-runtime@^0.11.0:
   version "0.11.1"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"