diff --git a/services/document-updater/.mocharc.json b/services/document-updater/.mocharc.json
deleted file mode 100644
index dc3280aa96..0000000000
--- a/services/document-updater/.mocharc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "require": "test/setup.js"
-}
diff --git a/services/document-updater/.nvmrc b/services/document-updater/.nvmrc
index e68b860383..2baa2d433a 100644
--- a/services/document-updater/.nvmrc
+++ b/services/document-updater/.nvmrc
@@ -1 +1 @@
-12.21.0
+10.23.1
diff --git a/services/document-updater/Dockerfile b/services/document-updater/Dockerfile
index 4f417a2a4b..2da67d2436 100644
--- a/services/document-updater/Dockerfile
+++ b/services/document-updater/Dockerfile
@@ -2,7 +2,7 @@
 # Instead run bin/update_build_scripts from
 # https://github.com/sharelatex/sharelatex-dev-environment
 
-FROM node:12.21.0 as base
+FROM node:10.23.1 as base
 
 WORKDIR /app
 
diff --git a/services/document-updater/Makefile b/services/document-updater/Makefile
index 7591d2a689..596aa47fdb 100644
--- a/services/document-updater/Makefile
+++ b/services/document-updater/Makefile
@@ -21,10 +21,8 @@ DOCKER_COMPOSE_TEST_UNIT = \
 	COMPOSE_PROJECT_NAME=test_unit_$(BUILD_DIR_NAME) $(DOCKER_COMPOSE)
 
 clean:
-	-docker rmi ci/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER)
-	-docker rmi gcr.io/overleaf-ops/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER)
-	-$(DOCKER_COMPOSE_TEST_UNIT) down --rmi local
-	-$(DOCKER_COMPOSE_TEST_ACCEPTANCE) down --rmi local
+	docker rmi ci/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER)
+	docker rmi gcr.io/overleaf-ops/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER)
 
 format:
 	$(DOCKER_COMPOSE) run --rm test_unit npm run --silent format
diff --git a/services/document-updater/app/js/RangesTracker.js b/services/document-updater/app/js/RangesTracker.js
index 5991ee2993..6107acf300 100644
--- a/services/document-updater/app/js/RangesTracker.js
+++ b/services/document-updater/app/js/RangesTracker.js
@@ -706,10 +706,8 @@ const load = function () {
           return result
         } else if (c1.op.i != null && c2.op.d != null) {
           return 1
-        } else if (c1.op.d != null && c2.op.i != null) {
-          return -1
         } else {
-          return 0
+          return -1
         }
       })
 
@@ -730,10 +728,8 @@ const load = function () {
           return result
         } else if (a.i != null && b.d != null) {
           return 1
-        } else if (a.d != null && b.i != null) {
-          return -1
         } else {
-          return 0
+          return -1
         }
       })
 
diff --git a/services/document-updater/buildscript.txt b/services/document-updater/buildscript.txt
index 2d2f00495e..0d8b15d9f5 100644
--- a/services/document-updater/buildscript.txt
+++ b/services/document-updater/buildscript.txt
@@ -3,6 +3,6 @@ document-updater
 --docker-repos=gcr.io/overleaf-ops
 --env-add=
 --env-pass-through=
---node-version=12.21.0
+--node-version=10.23.1
 --public-repo=True
---script-version=3.7.0
+--script-version=3.4.0
diff --git a/services/document-updater/docker-compose.yml b/services/document-updater/docker-compose.yml
index 6a1c097a30..0db448f9b5 100644
--- a/services/document-updater/docker-compose.yml
+++ b/services/document-updater/docker-compose.yml
@@ -6,7 +6,7 @@ version: "2.3"
 
 services:
   test_unit:
-    image: node:12.21.0
+    image: node:10.23.1
     volumes:
       - .:/app
     working_dir: /app
@@ -18,7 +18,7 @@ services:
     user: node
 
   test_acceptance:
-    image: node:12.21.0
+    image: node:10.23.1
     volumes:
       - .:/app
     working_dir: /app
diff --git a/services/document-updater/package-lock.json b/services/document-updater/package-lock.json
index 65b0a0d9c2..ac530644db 100644
--- a/services/document-updater/package-lock.json
+++ b/services/document-updater/package-lock.json
@@ -819,12 +819,6 @@
         }
       }
     },
-    "@ungap/promise-all-settled": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
-      "integrity": "sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==",
-      "dev": true
-    },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -893,12 +887,6 @@
         "uri-js": "^4.2.2"
       }
     },
-    "ansi-colors": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
-      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
-      "dev": true
-    },
     "ansi-escapes": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
@@ -931,16 +919,6 @@
         "color-convert": "^1.9.0"
       }
     },
-    "anymatch": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
-      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
-      "dev": true,
-      "requires": {
-        "normalize-path": "^3.0.0",
-        "picomatch": "^2.0.4"
-      }
-    },
     "aproba": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
@@ -1134,12 +1112,6 @@
       "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-7.2.1.tgz",
       "integrity": "sha1-gMBIdZ2CaACAfEv9Uh5Q7bulel8="
     },
-    "binary-extensions": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
-      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
-      "dev": true
-    },
     "bindings": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
@@ -1210,19 +1182,10 @@
         "concat-map": "0.0.1"
       }
     },
-    "braces": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
-      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
-      "dev": true,
-      "requires": {
-        "fill-range": "^7.0.1"
-      }
-    },
     "browser-stdout": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
-      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "integrity": "sha1-uqVZ7hTO1zRSIputcyZGfGH6vWA=",
       "dev": true
     },
     "bson": {
@@ -1306,6 +1269,12 @@
         "type-detect": "^1.0.0"
       }
     },
+    "chai-spies": {
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/chai-spies/-/chai-spies-0.7.1.tgz",
+      "integrity": "sha1-ND2Z9RJEIS6LF+ZLk5lv97LCqbE=",
+      "dev": true
+    },
     "chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -1323,22 +1292,6 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
-    "chokidar": {
-      "version": "3.5.1",
-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.1.tgz",
-      "integrity": "sha512-9+s+Od+W0VJJzawDma/gvBNQqkTiqYTWLuZoyAsivsI4AaWTCzHG06/TMjsf1cYe9Cb97UCEhjz7HvnPk2p/tw==",
-      "dev": true,
-      "requires": {
-        "anymatch": "~3.1.1",
-        "braces": "~3.0.2",
-        "fsevents": "~2.3.1",
-        "glob-parent": "~5.1.0",
-        "is-binary-path": "~2.1.0",
-        "is-glob": "~4.0.1",
-        "normalize-path": "~3.0.0",
-        "readdirp": "~3.5.0"
-      }
-    },
     "chownr": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
@@ -1380,12 +1333,6 @@
       "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
     },
-    "coffee-script": {
-      "version": "1.12.7",
-      "resolved": "https://registry.npmjs.org/coffee-script/-/coffee-script-1.12.7.tgz",
-      "integrity": "sha512-fLeEhqwymYat/MpTPUjSKHVYYl0ec2mOyALEMLmzr5i1isuG+6jfI2j2d5oBO3VIzgUXgBVIcOT9uH1TFxBckw==",
-      "dev": true
-    },
     "coffeescript": {
       "version": "2.5.1",
       "resolved": "https://registry.npmjs.org/coffeescript/-/coffeescript-2.5.1.tgz",
@@ -1528,7 +1475,7 @@
     "d64": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/d64/-/d64-1.0.0.tgz",
-      "integrity": "sha512-5eNy3WZziVYnrogqgXhcdEmqcDB2IHurTqLcrgssJsfkMVCUoUaZpK6cJjxxvLV2dUm5SuJMNcYfVGoin9UIRw=="
+      "integrity": "sha1-QAKofoUMv8n52XBrYPymE6MzbpA="
     },
     "damerau-levenshtein": {
       "version": "1.0.6",
@@ -1631,9 +1578,9 @@
       "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups="
     },
     "diff": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/diff/-/diff-5.0.0.tgz",
-      "integrity": "sha512-/VTCrvm5Z0JGty/BWHljh+BAiw3IK+2j87NGMu8Nwc/f48WoDAC395uomO9ZD117ZOBaHmkX1oyLvkVM/aIT3w==",
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
+      "integrity": "sha1-gAwN0eCov7yVg1wgKtIg/jF+WhI=",
       "dev": true
     },
     "diff-match-patch": {
@@ -1800,12 +1747,6 @@
         "is-symbol": "^1.0.2"
       }
     },
-    "escalade": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
-      "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==",
-      "dev": true
-    },
     "escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -2541,15 +2482,6 @@
       "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
       "integrity": "sha1-VTp7hEb/b2hDWcRF8eN6BdrMM90="
     },
-    "fill-range": {
-      "version": "7.0.1",
-      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
-      "integrity": "sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==",
-      "dev": true,
-      "requires": {
-        "to-regex-range": "^5.0.1"
-      }
-    },
     "finalhandler": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
@@ -2578,12 +2510,6 @@
       "resolved": "https://registry.npmjs.org/findit2/-/findit2-2.2.3.tgz",
       "integrity": "sha1-WKRmaX34piBc39vzlVNri9d3pfY="
     },
-    "flat": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/flat/-/flat-5.0.2.tgz",
-      "integrity": "sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==",
-      "dev": true
-    },
     "flat-cache": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-2.0.1.tgz",
@@ -2674,13 +2600,6 @@
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
-    "fsevents": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
-      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
-      "dev": true,
-      "optional": true
-    },
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
@@ -2971,9 +2890,9 @@
       "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk="
     },
     "he": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
-      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
+      "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
       "dev": true
     },
     "hex2dec": {
@@ -3326,15 +3245,6 @@
       "integrity": "sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0=",
       "dev": true
     },
-    "is-binary-path": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/is-binary-path/-/is-binary-path-2.1.0.tgz",
-      "integrity": "sha512-ZMERYes6pDydyuGidse7OsHxtbI7WVeUEozgR/g7rd0xUimYNlvZRE/K2MgZTjWy725IfelLeVcEM97mmtRGXw==",
-      "dev": true,
-      "requires": {
-        "binary-extensions": "^2.0.0"
-      }
-    },
     "is-callable": {
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.5.tgz",
@@ -3367,23 +3277,11 @@
         "is-extglob": "^2.1.1"
       }
     },
-    "is-number": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
-      "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
-      "dev": true
-    },
     "is-obj": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-obj/-/is-obj-2.0.0.tgz",
       "integrity": "sha512-drqDG3cbczxxEJRoOXcOjtdp1J/lyp1mNn0xaznRs8+muBhgQcrnbspox5X5fOw0HnMnbfDzvnEMEtqDEJEo8w=="
     },
-    "is-plain-obj": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-2.1.0.tgz",
-      "integrity": "sha512-YWnfyRwxL/+SsrWYfOpUtz5b3YD+nyfkHvjbcanzk8zgyO4ASD67uVMRt8k5bM4lLMDnXfriRhOpemw+NfT1eA==",
-      "dev": true
-    },
     "is-regex": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.5.tgz",
@@ -3569,12 +3467,12 @@
     "lodash.at": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/lodash.at/-/lodash.at-4.6.0.tgz",
-      "integrity": "sha512-GOTh0SEp+Yosnlpjic+8cl2WM9MykorogkGA9xyIFkkObQ3H3kNZqZ+ohuq4K3FrSVo7hMcZBMataJemrxC3BA=="
+      "integrity": "sha1-k83OZk8KGZTqM9181A4jr9EbD/g="
     },
     "lodash.camelcase": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/lodash.camelcase/-/lodash.camelcase-4.3.0.tgz",
-      "integrity": "sha512-TwuEnCnxbc3rAvhf/LbG7tJUDzhqXyFnv3dtzLOPgCG/hODL7WFnsbwktkD7yUV0RrreP/l1PALq/YSg6VvjlA=="
+      "integrity": "sha1-soqmKIorn8ZRA1x3EfZathkDMaY="
     },
     "lodash.defaults": {
       "version": "4.2.0",
@@ -3595,7 +3493,7 @@
     "lodash.has": {
       "version": "4.5.2",
       "resolved": "https://registry.npmjs.org/lodash.has/-/lodash.has-4.5.2.tgz",
-      "integrity": "sha512-rnYUdIo6xRCJnQmbVFEwcxF144erlD+M3YcJUVesflU9paQaE8p+fJDcIQrlMYbxoANFL+AB9hZrzSBBk5PL+g=="
+      "integrity": "sha1-0Z9NwQlQWMzL4rDN9O4P5Ko3yGI="
     },
     "lodash.memoize": {
       "version": "4.1.2",
@@ -3620,66 +3518,6 @@
       "resolved": "https://registry.npmjs.org/log-driver/-/log-driver-1.2.7.tgz",
       "integrity": "sha512-U7KCmLdqsGHBLeWqYlFA0V0Sl6P08EE1ZrmA9cxjUE0WVqT9qnyVDPz1kzpFEP0jdJuFnasWIfSd7fsaNXkpbg=="
     },
-    "log-symbols": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-4.0.0.tgz",
-      "integrity": "sha512-FN8JBzLx6CzeMrB0tg6pqlGU1wCrXW+ZXGH481kfsBqer0hToTIiHdjH4Mq8xJUbvATujKCvaREGWpGUionraA==",
-      "dev": true,
-      "requires": {
-        "chalk": "^4.0.0"
-      },
-      "dependencies": {
-        "ansi-styles": {
-          "version": "4.3.0",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
-          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^2.0.1"
-          }
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-        "chalk": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
-          "integrity": "sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^4.1.0",
-            "supports-color": "^7.1.0"
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-        "color-convert": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
-          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
-          "dev": true,
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-        "color-name": {
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-      "integrity": "sha512-cMhu7c/8rdhkHXWsY+osBhfSy0JikwpHK/5+imo+LpeasTF8ouErHrlYkwT0++njiyuDvc7OFY5T3ukvZ8qmFQ==",
-      "dev": true,
-      "requires": {
-        "picomatch": "^2.2.1"
-      }
-    },
     "redis-commands": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/redis-commands/-/redis-commands-1.5.0.tgz",
-      "integrity": "sha1-gNLiBpj+aI8icSf/nlFkp90X54U="
+      "integrity": "sha512-6KxamqpZ468MeQC3bkWmCB1fp56XL64D4Kf0zJSwDZbVLLm7KFkoIcHrgRvQ+sk8dnhySs7+yBg94yIkAK7aJg=="
     },
     "redis-errors": {
       "version": "1.2.0",
@@ -5888,7 +5483,7 @@
     "safe-json-stringify": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/safe-json-stringify/-/safe-json-stringify-1.2.0.tgz",
-      "integrity": "sha1-NW5EvJjx+TzkXfFLzXwBzahuCv0=",
+      "integrity": "sha512-gH8eh2nZudPQO6TytOvbxnuhYBOvDBBLW52tz5q6X58lJcd/tkmqFR+5Z9adS8aJtURSXWThWy/xJtJwixErvg==",
       "optional": true
     },
     "safer-buffer": {
@@ -5897,13 +5492,21 @@
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
     "sandboxed-module": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/sandboxed-module/-/sandboxed-module-2.0.4.tgz",
-      "integrity": "sha512-AwEPOdO8mg/wJjr876yCHP2DHqVN0MaggEXhp6IIf3bcI5cYoQl9QrrCHSrvToHjvdEiS5x4TVZRgjD2bEmNTA==",
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/sandboxed-module/-/sandboxed-module-0.2.2.tgz",
+      "integrity": "sha1-bL3sghOAx31FdcjIeDi5ET5kulA=",
       "dev": true,
       "requires": {
         "require-like": "0.1.2",
-        "stack-trace": "0.0.9"
+        "stack-trace": "0.0.6"
+      },
+      "dependencies": {
+        "stack-trace": {
+          "version": "0.0.6",
+          "resolved": "https://registry.npmjs.org/stack-trace/-/stack-trace-0.0.6.tgz",
+          "integrity": "sha1-HnGb1qJin/CcGJ4Xqe+QKpT8XbA=",
+          "dev": true
+        }
       }
     },
     "saslprep": {
@@ -5952,15 +5555,6 @@
         }
       }
     },
-    "serialize-javascript": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-5.0.1.tgz",
-      "integrity": "sha512-SaaNal9imEO737H2c05Og0/8LUXG7EnsZyMa8MzkmuHoELfT6txuj0cMqRj6zfPKnmQ1yasR4PCJc8x+M4JSPA==",
-      "dev": true,
-      "requires": {
-        "randombytes": "^2.1.0"
-      }
-    },
     "serve-static": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.1.tgz",
@@ -6183,7 +5777,7 @@
     "standard-as-callback": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/standard-as-callback/-/standard-as-callback-2.0.1.tgz",
-      "integrity": "sha1-7YuyVkjhWDF1m2Ajvbh+a2CzgSY="
+      "integrity": "sha512-NQOxSeB8gOI5WjSaxjBgog2QFw55FV8TkS6Y07BiB3VJ8xNTvUYm0wl0s8ObgQ5NhdpnNfigMIKjgPESzgr4tg=="
     },
     "statuses": {
       "version": "1.5.0",
@@ -6302,7 +5896,7 @@
     "stubs": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
-      "integrity": "sha512-PdHt7hHUJKxvTCgbKX9C1V/ftOcjJQgz8BZwNfV5c4B6dcGqlpelTbJ999jBGZ2jYiPAwcX5dP6oBwVlBlUbxw=="
+      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls="
     },
     "supports-color": {
       "version": "5.4.0",
@@ -6434,21 +6028,12 @@
     "to-no-case": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/to-no-case/-/to-no-case-1.0.2.tgz",
-      "integrity": "sha512-Z3g735FxuZY8rodxV4gH7LxClE4H0hTIyHNIHdk+vpQxjLm0cwnKXq/OFVZ76SOQmto7txVcwSCwkU5kqp+FKg=="
-    },
-    "to-regex-range": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
-      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
-      "dev": true,
-      "requires": {
-        "is-number": "^7.0.0"
-      }
+      "integrity": "sha1-xyKQcWTvaxeBMsjmmTAhLRtKoWo="
     },
     "to-snake-case": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/to-snake-case/-/to-snake-case-1.0.0.tgz",
-      "integrity": "sha512-joRpzBAk1Bhi2eGEYBjukEWHOe/IvclOkiJl3DtA91jV6NwQ3MwXA4FHYeqk8BNp/D8bmi9tcNbRu/SozP0jbQ==",
+      "integrity": "sha1-znRpE4l5RgGah+Yu366upMYIq4w=",
       "requires": {
         "to-space-case": "^1.0.0"
       }
@@ -6456,7 +6041,7 @@
     "to-space-case": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/to-space-case/-/to-space-case-1.0.0.tgz",
-      "integrity": "sha512-rLdvwXZ39VOn1IxGL3V6ZstoTbwLRckQmn/U8ZDLuWwIXNpuZDhQ3AiRUlhTbOXFVE9C+dR51wM0CBDhk31VcA==",
+      "integrity": "sha1-sFLar7Gysp3HcM6gFj5ewOvJ/Bc=",
       "requires": {
         "to-no-case": "^1.0.0"
       }
@@ -6737,12 +6322,6 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
-    "workerpool": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.1.0.tgz",
-      "integrity": "sha512-toV7q9rWNYha963Pl/qyeZ6wG+3nnsyvolaNUS8+R5Wtw6qJPTxIlOP1ZSvcGhEJw+l3HMMmtiNo9Gl61G4GVg==",
-      "dev": true
-    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
@@ -6833,32 +6412,6 @@
         "decamelize": "^1.2.0"
       }
     },
-    "yargs-unparser": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
-      "integrity": "sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==",
-      "dev": true,
-      "requires": {
-        "camelcase": "^6.0.0",
-        "decamelize": "^4.0.0",
-        "flat": "^5.0.2",
-        "is-plain-obj": "^2.1.0"
-      },
-      "dependencies": {
-        "camelcase": {
-          "version": "6.2.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.2.0.tgz",
-          "integrity": "sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==",
-          "dev": true
-        },
-        "decamelize": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-4.0.0.tgz",
-          "integrity": "sha512-9iE1PgSik9HeIIw2JO94IidnE3eBoQrFJ3w7sFuzSX4DpmZ3v5sZpUiV5Swcf6mQEF+Y0ru8Neo+p+nyh2J+hQ==",
-          "dev": true
-        }
-      }
-    },
     "yn": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
diff --git a/services/document-updater/package.json b/services/document-updater/package.json
index a3fb2690cb..8ea71edddb 100644
--- a/services/document-updater/package.json
+++ b/services/document-updater/package.json
@@ -36,8 +36,8 @@
   "devDependencies": {
     "babel-eslint": "^10.1.0",
     "chai": "^3.5.0",
+    "chai-spies": "^0.7.1",
     "cluster-key-slot": "^1.0.5",
-    "coffee-script": "^1.12.7",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.10.0",
     "eslint-config-standard": "^14.1.0",
@@ -53,10 +53,10 @@
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-react": "^7.19.0",
     "eslint-plugin-standard": "^4.0.1",
-    "mocha": "^8.3.2",
+    "mocha": "^5.0.1",
     "prettier": "^2.0.0",
     "prettier-eslint-cli": "^5.0.0",
-    "sandboxed-module": "^2.0.4",
+    "sandboxed-module": "~0.2.0",
     "sinon": "^9.0.2",
     "timekeeper": "^2.0.0"
   }
diff --git a/services/document-updater/test/acceptance/js/ApplyingUpdatesToADocTests.js b/services/document-updater/test/acceptance/js/ApplyingUpdatesToADocTests.js
index adf045645e..f460a2d3ff 100644
--- a/services/document-updater/test/acceptance/js/ApplyingUpdatesToADocTests.js
+++ b/services/document-updater/test/acceptance/js/ApplyingUpdatesToADocTests.js
@@ -12,7 +12,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+chai.should()
+const { expect } = chai
 const async = require('async')
 const Settings = require('settings-sharelatex')
 const rclient_history = require('@overleaf/redis-wrapper').createClient(
diff --git a/services/document-updater/test/acceptance/js/ApplyingUpdatesToProjectStructureTests.js b/services/document-updater/test/acceptance/js/ApplyingUpdatesToProjectStructureTests.js
index 3bc2c793e1..42c3c8af6a 100644
--- a/services/document-updater/test/acceptance/js/ApplyingUpdatesToProjectStructureTests.js
+++ b/services/document-updater/test/acceptance/js/ApplyingUpdatesToProjectStructureTests.js
@@ -1,4 +1,6 @@
 const sinon = require('sinon')
+const chai = require('chai')
+chai.should()
 const Settings = require('settings-sharelatex')
 const rclientProjectHistory = require('@overleaf/redis-wrapper').createClient(
   Settings.redis.project_history
diff --git a/services/document-updater/test/acceptance/js/DeletingADocumentTests.js b/services/document-updater/test/acceptance/js/DeletingADocumentTests.js
index 4051d4f5a4..fbb8055aae 100644
--- a/services/document-updater/test/acceptance/js/DeletingADocumentTests.js
+++ b/services/document-updater/test/acceptance/js/DeletingADocumentTests.js
@@ -11,6 +11,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+chai.should()
+
 const MockTrackChangesApi = require('./helpers/MockTrackChangesApi')
 const MockProjectHistoryApi = require('./helpers/MockProjectHistoryApi')
 const MockWebApi = require('./helpers/MockWebApi')
diff --git a/services/document-updater/test/acceptance/js/DeletingAProjectTests.js b/services/document-updater/test/acceptance/js/DeletingAProjectTests.js
index b07ffae0f5..f050ea22e1 100644
--- a/services/document-updater/test/acceptance/js/DeletingAProjectTests.js
+++ b/services/document-updater/test/acceptance/js/DeletingAProjectTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+chai.should()
 const async = require('async')
 
 const MockTrackChangesApi = require('./helpers/MockTrackChangesApi')
diff --git a/services/document-updater/test/acceptance/js/FlushingAProjectTests.js b/services/document-updater/test/acceptance/js/FlushingAProjectTests.js
index 4f4abc2730..c860fce849 100644
--- a/services/document-updater/test/acceptance/js/FlushingAProjectTests.js
+++ b/services/document-updater/test/acceptance/js/FlushingAProjectTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+chai.should()
 const async = require('async')
 
 const MockWebApi = require('./helpers/MockWebApi')
diff --git a/services/document-updater/test/acceptance/js/FlushingDocsTests.js b/services/document-updater/test/acceptance/js/FlushingDocsTests.js
index 5eac9fa2f3..109f89d434 100644
--- a/services/document-updater/test/acceptance/js/FlushingDocsTests.js
+++ b/services/document-updater/test/acceptance/js/FlushingDocsTests.js
@@ -14,7 +14,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+chai.should()
+const { expect } = chai
 const async = require('async')
 
 const MockWebApi = require('./helpers/MockWebApi')
diff --git a/services/document-updater/test/acceptance/js/GettingADocumentTests.js b/services/document-updater/test/acceptance/js/GettingADocumentTests.js
index 50dc35059c..a0b9de5773 100644
--- a/services/document-updater/test/acceptance/js/GettingADocumentTests.js
+++ b/services/document-updater/test/acceptance/js/GettingADocumentTests.js
@@ -12,7 +12,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+chai.should()
+const { expect } = chai
 
 const MockWebApi = require('./helpers/MockWebApi')
 const DocUpdaterClient = require('./helpers/DocUpdaterClient')
diff --git a/services/document-updater/test/acceptance/js/GettingProjectDocsTests.js b/services/document-updater/test/acceptance/js/GettingProjectDocsTests.js
index b32ccb0837..72a6824562 100644
--- a/services/document-updater/test/acceptance/js/GettingProjectDocsTests.js
+++ b/services/document-updater/test/acceptance/js/GettingProjectDocsTests.js
@@ -12,7 +12,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+chai.should()
+const { expect } = chai
 
 const MockWebApi = require('./helpers/MockWebApi')
 const DocUpdaterClient = require('./helpers/DocUpdaterClient')
diff --git a/services/document-updater/test/acceptance/js/RangesTests.js b/services/document-updater/test/acceptance/js/RangesTests.js
index 7034436440..b765e58b7c 100644
--- a/services/document-updater/test/acceptance/js/RangesTests.js
+++ b/services/document-updater/test/acceptance/js/RangesTests.js
@@ -12,7 +12,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+chai.should()
+const { expect } = chai
 const async = require('async')
 
 const { db, ObjectId } = require('../../../app/js/mongodb')
diff --git a/services/document-updater/test/acceptance/js/SettingADocumentTests.js b/services/document-updater/test/acceptance/js/SettingADocumentTests.js
index 7d2307c526..d47931868c 100644
--- a/services/document-updater/test/acceptance/js/SettingADocumentTests.js
+++ b/services/document-updater/test/acceptance/js/SettingADocumentTests.js
@@ -1,4 +1,6 @@
 const sinon = require('sinon')
+const chai = require('chai')
+chai.should()
 const { expect } = require('chai')
 const Settings = require('settings-sharelatex')
 const docUpdaterRedis = require('@overleaf/redis-wrapper').createClient(
diff --git a/services/document-updater/test/setup.js b/services/document-updater/test/setup.js
deleted file mode 100644
index 0fb9848427..0000000000
--- a/services/document-updater/test/setup.js
+++ /dev/null
@@ -1,37 +0,0 @@
-const chai = require('chai')
-const SandboxedModule = require('sandboxed-module')
-const sinon = require('sinon')
-
-// Chai configuration
-chai.should()
-
-// Global stubs
-const sandbox = sinon.createSandbox()
-const stubs = {
-  logger: {
-    debug: sandbox.stub(),
-    log: sandbox.stub(),
-    warn: sandbox.stub(),
-    err: sandbox.stub(),
-    error: sandbox.stub()
-  }
-}
-
-// SandboxedModule configuration
-SandboxedModule.configure({
-  requires: {
-    'logger-sharelatex': stubs.logger
-  },
-  globals: { Buffer, JSON, Math, console, process }
-})
-
-// Mocha hooks
-exports.mochaHooks = {
-  beforeEach() {
-    this.logger = stubs.logger
-  },
-
-  afterEach() {
-    sandbox.reset()
-  }
-}
diff --git a/services/document-updater/test/unit/js/DiffCodec/DiffCodecTests.js b/services/document-updater/test/unit/js/DiffCodec/DiffCodecTests.js
index d498d6b45c..f208c17bd6 100644
--- a/services/document-updater/test/unit/js/DiffCodec/DiffCodecTests.js
+++ b/services/document-updater/test/unit/js/DiffCodec/DiffCodecTests.js
@@ -11,7 +11,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+const should = chai.should()
+const { expect } = chai
 const modulePath = '../../../../app/js/DiffCodec.js'
 const SandboxedModule = require('sandboxed-module')
 
diff --git a/services/document-updater/test/unit/js/DispatchManager/DispatchManagerTests.js b/services/document-updater/test/unit/js/DispatchManager/DispatchManagerTests.js
index 81ef37f4be..5610c4abc1 100644
--- a/services/document-updater/test/unit/js/DispatchManager/DispatchManagerTests.js
+++ b/services/document-updater/test/unit/js/DispatchManager/DispatchManagerTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/DispatchManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors.js')
@@ -23,6 +25,11 @@ describe('DispatchManager', function () {
     this.DispatchManager = SandboxedModule.require(modulePath, {
       requires: {
         './UpdateManager': (this.UpdateManager = {}),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          error: sinon.stub(),
+          warn: sinon.stub()
+        }),
         'settings-sharelatex': (this.settings = {
           redis: {
             documentupdater: {}
diff --git a/services/document-updater/test/unit/js/DocumentManager/DocumentManagerTests.js b/services/document-updater/test/unit/js/DocumentManager/DocumentManagerTests.js
index 8ca42df757..295a643cee 100644
--- a/services/document-updater/test/unit/js/DocumentManager/DocumentManagerTests.js
+++ b/services/document-updater/test/unit/js/DocumentManager/DocumentManagerTests.js
@@ -13,6 +13,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/DocumentManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors')
@@ -31,6 +33,11 @@ describe('DocumentManager', function () {
           flushDocChangesAsync: sinon.stub(),
           flushProjectChangesAsync: sinon.stub()
         }),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          warn: sinon.stub()
+        }),
+        './DocOpsManager': (this.DocOpsManager = {}),
         './Metrics': (this.Metrics = {
           Timer: (Timer = (function () {
             Timer = class Timer {
@@ -213,6 +220,7 @@ describe('DocumentManager', function () {
           .stub()
           .callsArgWith(2, null, null, null, null)
         this.PersistenceManager.setDoc = sinon.stub().yields()
+        this.DocOpsManager.flushDocOpsToMongo = sinon.stub().callsArgWith(2)
         return this.DocumentManager.flushDocIfLoaded(
           this.project_id,
           this.doc_id,
@@ -228,6 +236,7 @@ describe('DocumentManager', function () {
 
       it('should not write anything to the persistence layer', function () {
         this.PersistenceManager.setDoc.called.should.equal(false)
+        return this.DocOpsManager.flushDocOpsToMongo.called.should.equal(false)
       })
 
       it('should call the callback without error', function () {
diff --git a/services/document-updater/test/unit/js/HistoryManager/HistoryManagerTests.js b/services/document-updater/test/unit/js/HistoryManager/HistoryManagerTests.js
index df3261b0f4..263f1cd094 100644
--- a/services/document-updater/test/unit/js/HistoryManager/HistoryManagerTests.js
+++ b/services/document-updater/test/unit/js/HistoryManager/HistoryManagerTests.js
@@ -11,6 +11,7 @@
  */
 const SandboxedModule = require('sandboxed-module')
 const sinon = require('sinon')
+require('chai').should()
 const modulePath = require('path').join(
   __dirname,
   '../../../../app/js/HistoryManager'
@@ -32,6 +33,11 @@ describe('HistoryManager', function () {
             }
           }
         }),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          error: sinon.stub(),
+          debug: sinon.stub()
+        }),
         './DocumentManager': (this.DocumentManager = {}),
         './HistoryRedisManager': (this.HistoryRedisManager = {}),
         './RedisManager': (this.RedisManager = {}),
diff --git a/services/document-updater/test/unit/js/HistoryRedisManager/HistoryRedisManagerTests.js b/services/document-updater/test/unit/js/HistoryRedisManager/HistoryRedisManagerTests.js
index f9b719991a..1b266685d1 100644
--- a/services/document-updater/test/unit/js/HistoryRedisManager/HistoryRedisManagerTests.js
+++ b/services/document-updater/test/unit/js/HistoryRedisManager/HistoryRedisManagerTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/HistoryRedisManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors')
@@ -39,7 +41,8 @@ describe('HistoryRedisManager', function () {
               }
             })
           }
-        }
+        },
+        'logger-sharelatex': { log() {} }
       }
     })
     this.doc_id = 'doc-id-123'
diff --git a/services/document-updater/test/unit/js/HttpController/HttpControllerTests.js b/services/document-updater/test/unit/js/HttpController/HttpControllerTests.js
index 64477eb944..07e9d93c9a 100644
--- a/services/document-updater/test/unit/js/HttpController/HttpControllerTests.js
+++ b/services/document-updater/test/unit/js/HttpController/HttpControllerTests.js
@@ -12,6 +12,7 @@ describe('HttpController', function () {
           flushProjectChangesAsync: sinon.stub()
         }),
         './ProjectManager': (this.ProjectManager = {}),
+        'logger-sharelatex': (this.logger = { log: sinon.stub() }),
         './ProjectFlusher': { flushAllProjects() {} },
         './DeleteQueueManager': (this.DeleteQueueManager = {}),
         './Metrics': (this.Metrics = {}),
diff --git a/services/document-updater/test/unit/js/LockManager/CheckingTheLock.js b/services/document-updater/test/unit/js/LockManager/CheckingTheLock.js
index 4f700cc144..6b3c3b539e 100644
--- a/services/document-updater/test/unit/js/LockManager/CheckingTheLock.js
+++ b/services/document-updater/test/unit/js/LockManager/CheckingTheLock.js
@@ -25,6 +25,7 @@ describe('LockManager - checking the lock', function () {
   const existsStub = sinon.stub()
 
   const mocks = {
+    'logger-sharelatex': { log() {} },
     '@overleaf/redis-wrapper': {
       createClient() {
         return {
diff --git a/services/document-updater/test/unit/js/LockManager/ReleasingTheLock.js b/services/document-updater/test/unit/js/LockManager/ReleasingTheLock.js
index 3d6cf7a5ba..a04db7614f 100644
--- a/services/document-updater/test/unit/js/LockManager/ReleasingTheLock.js
+++ b/services/document-updater/test/unit/js/LockManager/ReleasingTheLock.js
@@ -27,6 +27,10 @@ describe('LockManager - releasing the lock', function () {
       eval: sinon.stub()
     }
     const mocks = {
+      'logger-sharelatex': {
+        log() {},
+        error() {}
+      },
       '@overleaf/redis-wrapper': {
         createClient: () => this.client
       },
diff --git a/services/document-updater/test/unit/js/LockManager/getLockTests.js b/services/document-updater/test/unit/js/LockManager/getLockTests.js
index 0b938c3753..d56a244510 100644
--- a/services/document-updater/test/unit/js/LockManager/getLockTests.js
+++ b/services/document-updater/test/unit/js/LockManager/getLockTests.js
@@ -15,6 +15,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/LockManager.js'
 const SandboxedModule = require('sandboxed-module')
 
@@ -23,6 +25,7 @@ describe('LockManager - getting the lock', function () {
     let Profiler
     this.LockManager = SandboxedModule.require(modulePath, {
       requires: {
+        'logger-sharelatex': { log() {} },
         '@overleaf/redis-wrapper': {
           createClient: () => {
             return { auth() {} }
diff --git a/services/document-updater/test/unit/js/LockManager/tryLockTests.js b/services/document-updater/test/unit/js/LockManager/tryLockTests.js
index fb49e94aa1..02c279dd11 100644
--- a/services/document-updater/test/unit/js/LockManager/tryLockTests.js
+++ b/services/document-updater/test/unit/js/LockManager/tryLockTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/LockManager.js'
 const SandboxedModule = require('sandboxed-module')
 
@@ -20,6 +22,7 @@ describe('LockManager - trying the lock', function () {
     let Profiler
     this.LockManager = SandboxedModule.require(modulePath, {
       requires: {
+        'logger-sharelatex': { log() {} },
         '@overleaf/redis-wrapper': {
           createClient: () => {
             return {
diff --git a/services/document-updater/test/unit/js/PersistenceManager/PersistenceManagerTests.js b/services/document-updater/test/unit/js/PersistenceManager/PersistenceManagerTests.js
index 4015ef2662..1013752dee 100644
--- a/services/document-updater/test/unit/js/PersistenceManager/PersistenceManagerTests.js
+++ b/services/document-updater/test/unit/js/PersistenceManager/PersistenceManagerTests.js
@@ -11,6 +11,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/PersistenceManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors')
@@ -36,6 +38,11 @@ describe('PersistenceManager', function () {
           })()),
           inc: sinon.stub()
         }),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          err: sinon.stub(),
+          error: sinon.stub()
+        }),
         './Errors': Errors
       }
     })
diff --git a/services/document-updater/test/unit/js/ProjectHistoryRedisManager/ProjectHistoryRedisManagerTests.js b/services/document-updater/test/unit/js/ProjectHistoryRedisManager/ProjectHistoryRedisManagerTests.js
index 1ff3d53ded..8b62bd83f3 100644
--- a/services/document-updater/test/unit/js/ProjectHistoryRedisManager/ProjectHistoryRedisManagerTests.js
+++ b/services/document-updater/test/unit/js/ProjectHistoryRedisManager/ProjectHistoryRedisManagerTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/ProjectHistoryRedisManager.js'
 const SandboxedModule = require('sandboxed-module')
 const tk = require('timekeeper')
@@ -45,7 +47,13 @@ describe('ProjectHistoryRedisManager', function () {
           '@overleaf/redis-wrapper': {
             createClient: () => this.rclient
           },
+          'logger-sharelatex': {
+            log() {}
+          },
           './Metrics': (this.metrics = { summary: sinon.stub() })
+        },
+        globals: {
+          JSON: (this.JSON = JSON)
         }
       }
     ))
@@ -128,7 +136,7 @@ describe('ProjectHistoryRedisManager', function () {
       return this.ProjectHistoryRedisManager.queueOps
         .calledWithExactly(
           this.project_id,
-          JSON.stringify(update),
+          this.JSON.stringify(update),
           this.callback
         )
         .should.equal(true)
@@ -176,7 +184,7 @@ describe('ProjectHistoryRedisManager', function () {
       return this.ProjectHistoryRedisManager.queueOps
         .calledWithExactly(
           this.project_id,
-          JSON.stringify(update),
+          this.JSON.stringify(update),
           this.callback
         )
         .should.equal(true)
diff --git a/services/document-updater/test/unit/js/ProjectManager/flushAndDeleteProjectTests.js b/services/document-updater/test/unit/js/ProjectManager/flushAndDeleteProjectTests.js
index d8342c0cff..9589d42054 100644
--- a/services/document-updater/test/unit/js/ProjectManager/flushAndDeleteProjectTests.js
+++ b/services/document-updater/test/unit/js/ProjectManager/flushAndDeleteProjectTests.js
@@ -13,6 +13,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/ProjectManager.js'
 const SandboxedModule = require('sandboxed-module')
 
@@ -24,6 +26,10 @@ describe('ProjectManager - flushAndDeleteProject', function () {
         './RedisManager': (this.RedisManager = {}),
         './ProjectHistoryRedisManager': (this.ProjectHistoryRedisManager = {}),
         './DocumentManager': (this.DocumentManager = {}),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          error: sinon.stub()
+        }),
         './HistoryManager': (this.HistoryManager = {
           flushProjectChanges: sinon.stub().callsArg(2)
         }),
diff --git a/services/document-updater/test/unit/js/ProjectManager/flushProjectTests.js b/services/document-updater/test/unit/js/ProjectManager/flushProjectTests.js
index 70ae03e861..c0bb668f49 100644
--- a/services/document-updater/test/unit/js/ProjectManager/flushProjectTests.js
+++ b/services/document-updater/test/unit/js/ProjectManager/flushProjectTests.js
@@ -15,6 +15,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/ProjectManager.js'
 const SandboxedModule = require('sandboxed-module')
 
@@ -26,6 +28,10 @@ describe('ProjectManager - flushProject', function () {
         './RedisManager': (this.RedisManager = {}),
         './ProjectHistoryRedisManager': (this.ProjectHistoryRedisManager = {}),
         './DocumentManager': (this.DocumentManager = {}),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          error: sinon.stub()
+        }),
         './HistoryManager': (this.HistoryManager = {}),
         './Metrics': (this.Metrics = {
           Timer: (Timer = (function () {
diff --git a/services/document-updater/test/unit/js/ProjectManager/getProjectDocsTests.js b/services/document-updater/test/unit/js/ProjectManager/getProjectDocsTests.js
index 467a190168..db9f31e4ad 100644
--- a/services/document-updater/test/unit/js/ProjectManager/getProjectDocsTests.js
+++ b/services/document-updater/test/unit/js/ProjectManager/getProjectDocsTests.js
@@ -11,6 +11,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/ProjectManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors.js')
@@ -23,6 +25,10 @@ describe('ProjectManager - getProjectDocsAndFlushIfOld', function () {
         './RedisManager': (this.RedisManager = {}),
         './ProjectHistoryRedisManager': (this.ProjectHistoryRedisManager = {}),
         './DocumentManager': (this.DocumentManager = {}),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          error: sinon.stub()
+        }),
         './HistoryManager': (this.HistoryManager = {}),
         './Metrics': (this.Metrics = {
           Timer: (Timer = (function () {
diff --git a/services/document-updater/test/unit/js/ProjectManager/updateProjectTests.js b/services/document-updater/test/unit/js/ProjectManager/updateProjectTests.js
index 896517679c..aa3db813a0 100644
--- a/services/document-updater/test/unit/js/ProjectManager/updateProjectTests.js
+++ b/services/document-updater/test/unit/js/ProjectManager/updateProjectTests.js
@@ -22,11 +22,17 @@ describe('ProjectManager', function () {
     }
     this.Metrics.Timer.prototype.done = sinon.stub()
 
+    this.logger = {
+      log: sinon.stub(),
+      error: sinon.stub()
+    }
+
     this.ProjectManager = SandboxedModule.require(modulePath, {
       requires: {
         './RedisManager': this.RedisManager,
         './ProjectHistoryRedisManager': this.ProjectHistoryRedisManager,
         './DocumentManager': this.DocumentManager,
+        'logger-sharelatex': this.logger,
         './HistoryManager': this.HistoryManager,
         './Metrics': this.Metrics
       }
diff --git a/services/document-updater/test/unit/js/RangesManager/RangesManagerTests.js b/services/document-updater/test/unit/js/RangesManager/RangesManagerTests.js
index c857153888..a336125a1c 100644
--- a/services/document-updater/test/unit/js/RangesManager/RangesManagerTests.js
+++ b/services/document-updater/test/unit/js/RangesManager/RangesManagerTests.js
@@ -13,13 +13,23 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+const should = chai.should()
+const { expect } = chai
 const modulePath = '../../../../app/js/RangesManager.js'
 const SandboxedModule = require('sandboxed-module')
 
 describe('RangesManager', function () {
   beforeEach(function () {
-    this.RangesManager = SandboxedModule.require(modulePath)
+    this.RangesManager = SandboxedModule.require(modulePath, {
+      requires: {
+        'logger-sharelatex': (this.logger = {
+          error: sinon.stub(),
+          log: sinon.stub(),
+          warn: sinon.stub()
+        })
+      }
+    })
 
     this.doc_id = 'doc-id-123'
     this.project_id = 'project-id-123'
@@ -358,6 +368,11 @@ describe('RangesManager', function () {
     beforeEach(function () {
       this.RangesManager = SandboxedModule.require(modulePath, {
         requires: {
+          'logger-sharelatex': (this.logger = {
+            error: sinon.stub(),
+            log: sinon.stub(),
+            warn: sinon.stub()
+          }),
           './RangesTracker': (this.RangesTracker = SandboxedModule.require(
             '../../../../app/js/RangesTracker.js'
           ))
diff --git a/services/document-updater/test/unit/js/RateLimitManager/RateLimitManager.js b/services/document-updater/test/unit/js/RateLimitManager/RateLimitManager.js
index 8fef08051f..e84d557501 100644
--- a/services/document-updater/test/unit/js/RateLimitManager/RateLimitManager.js
+++ b/services/document-updater/test/unit/js/RateLimitManager/RateLimitManager.js
@@ -11,7 +11,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+const should = chai.should()
+const { expect } = chai
 const modulePath = '../../../../app/js/RateLimitManager.js'
 const SandboxedModule = require('sandboxed-module')
 
@@ -20,6 +22,7 @@ describe('RateLimitManager', function () {
     let Timer
     this.RateLimitManager = SandboxedModule.require(modulePath, {
       requires: {
+        'logger-sharelatex': (this.logger = { log: sinon.stub() }),
         'settings-sharelatex': (this.settings = {}),
         './Metrics': (this.Metrics = {
           Timer: (Timer = (function () {
diff --git a/services/document-updater/test/unit/js/RealTimeRedisManager/RealTimeRedisManagerTests.js b/services/document-updater/test/unit/js/RealTimeRedisManager/RealTimeRedisManagerTests.js
index 83cd5f99ce..c5e4647df4 100644
--- a/services/document-updater/test/unit/js/RealTimeRedisManager/RealTimeRedisManagerTests.js
+++ b/services/document-updater/test/unit/js/RealTimeRedisManager/RealTimeRedisManagerTests.js
@@ -11,6 +11,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/RealTimeRedisManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors')
@@ -43,6 +45,7 @@ describe('RealTimeRedisManager', function () {
             }
           }
         },
+        'logger-sharelatex': { log() {} },
         crypto: (this.crypto = {
           randomBytes: sinon
             .stub()
diff --git a/services/document-updater/test/unit/js/RedisManager/RedisManagerTests.js b/services/document-updater/test/unit/js/RedisManager/RedisManagerTests.js
index d14d0c23de..739aa88ab8 100644
--- a/services/document-updater/test/unit/js/RedisManager/RedisManagerTests.js
+++ b/services/document-updater/test/unit/js/RedisManager/RedisManagerTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/RedisManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors')
@@ -26,6 +28,11 @@ describe('RedisManager', function () {
     tk.freeze(new Date())
     this.RedisManager = SandboxedModule.require(modulePath, {
       requires: {
+        'logger-sharelatex': (this.logger = {
+          error: sinon.stub(),
+          log: sinon.stub(),
+          warn: sinon.stub()
+        }),
         './ProjectHistoryRedisManager': (this.ProjectHistoryRedisManager = {}),
         'settings-sharelatex': (this.settings = {
           documentupdater: { logHashErrors: { write: true, read: true } },
@@ -115,6 +122,9 @@ describe('RedisManager', function () {
           })
         }),
         './Errors': Errors
+      },
+      globals: {
+        JSON: (this.JSON = JSON)
       }
     })
 
@@ -914,9 +924,8 @@ describe('RedisManager', function () {
         this.RedisManager.getDocVersion
           .withArgs(this.doc_id)
           .yields(null, this.version - this.ops.length)
-        this.stringifyStub = sinon
-          .stub(JSON, 'stringify')
-          .callsFake(() => '["bad bytes! \u0000 <- here"]')
+        this._stringify = JSON.stringify
+        this.JSON.stringify = () => '["bad bytes! \u0000 <- here"]'
         return this.RedisManager.updateDocument(
           this.project_id,
           this.doc_id,
@@ -930,7 +939,7 @@ describe('RedisManager', function () {
       })
 
       afterEach(function () {
-        this.stringifyStub.restore()
+        return (this.JSON.stringify = this._stringify)
       })
 
       it('should log an error', function () {
@@ -1118,9 +1127,8 @@ describe('RedisManager', function () {
 
     describe('with null bytes in the serialized doc lines', function () {
       beforeEach(function () {
-        this.stringifyStub = sinon
-          .stub(JSON, 'stringify')
-          .callsFake(() => '["bad bytes! \u0000 <- here"]')
+        this._stringify = JSON.stringify
+        this.JSON.stringify = () => '["bad bytes! \u0000 <- here"]'
         return this.RedisManager.putDocInMemory(
           this.project_id,
           this.doc_id,
@@ -1134,7 +1142,7 @@ describe('RedisManager', function () {
       })
 
       afterEach(function () {
-        this.stringifyStub.restore()
+        return (this.JSON.stringify = this._stringify)
       })
 
       it('should log an error', function () {
diff --git a/services/document-updater/test/unit/js/ShareJS/TextTransformTests.js b/services/document-updater/test/unit/js/ShareJS/TextTransformTests.js
index a5e3a8599a..8ea99aee5c 100644
--- a/services/document-updater/test/unit/js/ShareJS/TextTransformTests.js
+++ b/services/document-updater/test/unit/js/ShareJS/TextTransformTests.js
@@ -14,6 +14,7 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const text = require('../../../../app/js/sharejs/types/text')
+require('chai').should()
 const RangesTracker = require('../../../../app/js/RangesTracker')
 
 describe('ShareJS text type', function () {
diff --git a/services/document-updater/test/unit/js/ShareJsDB/ShareJsDBTests.js b/services/document-updater/test/unit/js/ShareJsDB/ShareJsDBTests.js
index 1b4e4422a6..ddf98775d8 100644
--- a/services/document-updater/test/unit/js/ShareJsDB/ShareJsDBTests.js
+++ b/services/document-updater/test/unit/js/ShareJsDB/ShareJsDBTests.js
@@ -11,7 +11,9 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
-const { expect } = require('chai')
+const chai = require('chai')
+const should = chai.should()
+const { expect } = chai
 const modulePath = '../../../../app/js/ShareJsDB.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors')
diff --git a/services/document-updater/test/unit/js/ShareJsUpdateManager/ShareJsUpdateManagerTests.js b/services/document-updater/test/unit/js/ShareJsUpdateManager/ShareJsUpdateManagerTests.js
index d6e9700bff..2ab5ba617e 100644
--- a/services/document-updater/test/unit/js/ShareJsUpdateManager/ShareJsUpdateManagerTests.js
+++ b/services/document-updater/test/unit/js/ShareJsUpdateManager/ShareJsUpdateManagerTests.js
@@ -10,6 +10,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/ShareJsUpdateManager.js'
 const SandboxedModule = require('sandboxed-module')
 const crypto = require('crypto')
@@ -33,6 +35,7 @@ describe('ShareJsUpdateManager', function () {
             return (this.rclient = { auth() {} })
           }
         },
+        'logger-sharelatex': (this.logger = { log: sinon.stub() }),
         './RealTimeRedisManager': (this.RealTimeRedisManager = {}),
         './Metrics': (this.metrics = { inc: sinon.stub() })
       },
diff --git a/services/document-updater/test/unit/js/UpdateManager/UpdateManagerTests.js b/services/document-updater/test/unit/js/UpdateManager/UpdateManagerTests.js
index cac51b9f5f..4e39089490 100644
--- a/services/document-updater/test/unit/js/UpdateManager/UpdateManagerTests.js
+++ b/services/document-updater/test/unit/js/UpdateManager/UpdateManagerTests.js
@@ -12,6 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/UpdateManager.js'
 const SandboxedModule = require('sandboxed-module')
 
@@ -29,6 +31,7 @@ describe('UpdateManager', function () {
         './RealTimeRedisManager': (this.RealTimeRedisManager = {}),
         './ShareJsUpdateManager': (this.ShareJsUpdateManager = {}),
         './HistoryManager': (this.HistoryManager = {}),
+        'logger-sharelatex': (this.logger = { log: sinon.stub() }),
         './Metrics': (this.Metrics = {
           Timer: (Timer = (function () {
             Timer = class Timer {