diff --git a/Gruntfile.js b/Gruntfile.js
index c38511386f..170ee5b353 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -16,7 +16,6 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const coffee = require('coffee-script')
 const fs = require('fs')
 const { spawn } = require('child_process')
 const { exec } = require('child_process')
@@ -38,7 +37,6 @@ module.exports = function (grunt) {
   grunt.loadNpmTasks('grunt-execute')
   grunt.loadNpmTasks('grunt-available-tasks')
   grunt.loadNpmTasks('grunt-concurrent')
-  grunt.loadNpmTasks('grunt-contrib-coffee')
   grunt.loadNpmTasks('grunt-shell')
 
   grunt.task.loadTasks('./tasks')
diff --git a/package-lock.json b/package-lock.json
index 2f074b3a51..3331f87502 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -30,31 +30,10 @@
         "js-tokens": "^4.0.0"
       },
       "dependencies": {
-        "ansi-styles": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^1.9.0"
-          }
-        },
-        "chalk": {
-          "version": "2.4.2",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^3.2.1",
-            "escape-string-regexp": "^1.0.5",
-            "supports-color": "^5.3.0"
-          }
-        },
         "escape-string-regexp": {
           "version": "1.0.5",
           "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-          "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
-          "dev": true
+          "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
         }
       }
     },
@@ -205,10 +184,13 @@
       "dev": true
     },
     "ansi-styles": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-1.0.0.tgz",
-      "integrity": "sha1-yxAt8cVvUSPquLZ817mAJ6AnkXg=",
-      "dev": true
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
     },
     "argparse": {
       "version": "0.1.16",
@@ -234,6 +216,11 @@
         }
       }
     },
+    "array-differ": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
+      "integrity": "sha1-7/UuN1gknTO+QCuLuOVkuytdQDE="
+    },
     "array-includes": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.1.3.tgz",
@@ -247,6 +234,19 @@
         "is-string": "^1.0.5"
       }
     },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY="
+    },
     "array.prototype.flat": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/array.prototype.flat/-/array.prototype.flat-1.2.4.tgz",
@@ -258,6 +258,11 @@
         "es-abstract": "^1.18.0-next.1"
       }
     },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0="
+    },
     "astral-regex": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",
@@ -317,14 +322,13 @@
       "dev": true
     },
     "chalk": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-0.4.0.tgz",
-      "integrity": "sha1-UZmj3c0MHv4jvAjBsCewYXbgxk8=",
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
       "dev": true,
       "requires": {
-        "ansi-styles": "~1.0.0",
-        "has-color": "~0.1.0",
-        "strip-ansi": "~0.1.0"
+        "ansi-styles": "^3.2.1",
+        "supports-color": "^5.3.0"
       }
     },
     "coffee-script": {
@@ -353,6 +357,14 @@
       "integrity": "sha1-JCP+ZnisDF2uiFLl0OW+CMmXq8w=",
       "dev": true
     },
+    "commander": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
+      "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
+      "requires": {
+        "graceful-readlink": ">= 1.0.0"
+      }
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -387,6 +399,26 @@
         }
       }
     },
+    "cson": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/cson/-/cson-3.0.2.tgz",
+      "integrity": "sha1-g+6Qids8JUvsHpjkmNmqzxGtzFQ=",
+      "requires": {
+        "coffee-script": "^1.9.0",
+        "cson-parser": "^1.0.6",
+        "extract-opts": "^3.0.1",
+        "requirefresh": "^2.0.0",
+        "safefs": "^4.0.0"
+      }
+    },
+    "cson-parser": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/cson-parser/-/cson-parser-1.3.5.tgz",
+      "integrity": "sha1-fsZ14DkUVTO/KmqFYHPxWZ2cLSQ=",
+      "requires": {
+        "coffee-script": "^1.10.0"
+      }
+    },
     "dateformat": {
       "version": "1.0.2-1.2.3",
       "resolved": "https://registry.npmjs.org/dateformat/-/dateformat-1.0.2-1.2.3.tgz",
@@ -423,6 +455,11 @@
         "esutils": "^2.0.2"
       }
     },
+    "double-ended-queue": {
+      "version": "2.1.0-0",
+      "resolved": "https://registry.npmjs.org/double-ended-queue/-/double-ended-queue-2.1.0-0.tgz",
+      "integrity": "sha1-ED01J/0xUo9AGIEwyEHv3XgmTlw="
+    },
     "dtrace-provider": {
       "version": "0.2.8",
       "resolved": "https://registry.npmjs.org/dtrace-provider/-/dtrace-provider-0.2.8.tgz",
@@ -430,6 +467,20 @@
       "dev": true,
       "optional": true
     },
+    "each-series": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/each-series/-/each-series-1.0.0.tgz",
+      "integrity": "sha1-+Ibmxm39sl7x/nNWQUbuXLR4r8s="
+    },
+    "eachr": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/eachr/-/eachr-3.2.0.tgz",
+      "integrity": "sha1-LDXkPqCGUW95l8+At6pk1VpKRIQ=",
+      "requires": {
+        "editions": "^1.1.1",
+        "typechecker": "^4.3.0"
+      }
+    },
     "east": {
       "version": "0.5.7",
       "resolved": "https://registry.npmjs.org/east/-/east-0.5.7.tgz",
@@ -441,35 +492,10 @@
         "twostep": "0.4.2"
       },
       "dependencies": {
-        "commander": {
-          "version": "2.9.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
-          "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
-          "requires": {
-            "graceful-readlink": ">= 1.0.0"
-          },
-          "dependencies": {
-            "graceful-readlink": {
-              "version": "1.0.1",
-              "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
-              "integrity": "sha1-TK+tdrxi8C+gObL5Tpo906ORpyU="
-            }
-          }
-        },
-        "expressionify": {
-          "version": "0.9.3",
-          "resolved": "https://registry.npmjs.org/expressionify/-/expressionify-0.9.3.tgz",
-          "integrity": "sha1-/iJnx+hpRXfxP02oML/DyNgXf5I="
-        },
         "progress": {
           "version": "1.1.8",
           "resolved": "https://registry.npmjs.org/progress/-/progress-1.1.8.tgz",
           "integrity": "sha1-4mDHj2Fhzdmw5WzD4Khd4Xx6V74="
-        },
-        "twostep": {
-          "version": "0.4.2",
-          "resolved": "https://registry.npmjs.org/twostep/-/twostep-0.4.2.tgz",
-          "integrity": "sha1-hLxQh6hxV00ev3vjB54D4SLUFbY="
         }
       }
     },
@@ -478,6 +504,11 @@
       "resolved": "https://registry.npmjs.org/east-mongo/-/east-mongo-0.3.3.tgz",
       "integrity": "sha1-WKtCdGaRy+ITtBweiG8EttyCq8A="
     },
+    "editions": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/editions/-/editions-1.3.4.tgz",
+      "integrity": "sha512-gzao+mxnYDzIysXKMQi/+M1mjy/rjestjg6OPoYTtI+3Izp23oiGZitsl9lPDPiTGXbcSIk1iJWhliSaglxnUg=="
+    },
     "emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
@@ -537,6 +568,11 @@
         "is-symbol": "^1.0.2"
       }
     },
+    "es6-promise": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-3.2.1.tgz",
+      "integrity": "sha1-7FYjOGgDKQkgcXDDlEjiREndH8Q="
+    },
     "escape-string-regexp": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz",
@@ -692,15 +728,6 @@
             "lru-cache": "^6.0.0"
           }
         },
-        "strip-ansi": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
-          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^5.0.0"
-          }
-        },
         "supports-color": {
           "version": "7.2.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -1027,6 +1054,21 @@
       "integrity": "sha1-BjJjj42HfMghB9MKD/8aF8uhzQw=",
       "dev": true
     },
+    "expressionify": {
+      "version": "0.9.3",
+      "resolved": "https://registry.npmjs.org/expressionify/-/expressionify-0.9.3.tgz",
+      "integrity": "sha1-/iJnx+hpRXfxP02oML/DyNgXf5I="
+    },
+    "extract-opts": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/extract-opts/-/extract-opts-3.3.1.tgz",
+      "integrity": "sha1-WrvtyYwNUgLjJ4cn+Rktfghsa+E=",
+      "requires": {
+        "eachr": "^3.2.0",
+        "editions": "^1.1.1",
+        "typechecker": "^4.3.0"
+      }
+    },
     "fast-deep-equal": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
@@ -1229,6 +1271,11 @@
       "integrity": "sha1-FaSAaldUfLLS2/J/QuiajDRRs2Q=",
       "dev": true
     },
+    "graceful-readlink": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
+      "integrity": "sha1-TK+tdrxi8C+gObL5Tpo906ORpyU="
+    },
     "grunt": {
       "version": "0.4.5",
       "resolved": "https://registry.npmjs.org/grunt/-/grunt-0.4.5.tgz",
@@ -1336,40 +1383,6 @@
         }
       }
     },
-    "grunt-contrib-coffee": {
-      "version": "0.10.1",
-      "resolved": "https://registry.npmjs.org/grunt-contrib-coffee/-/grunt-contrib-coffee-0.10.1.tgz",
-      "integrity": "sha1-7SLGgp9FiqjqR/hnaEM+mBMUAYY=",
-      "dev": true,
-      "requires": {
-        "chalk": "~0.4.0",
-        "coffee-script": "~1.7.0",
-        "lodash": "~2.4.1"
-      },
-      "dependencies": {
-        "coffee-script": {
-          "version": "1.7.1",
-          "resolved": "https://registry.npmjs.org/coffee-script/-/coffee-script-1.7.1.tgz",
-          "integrity": "sha1-YplqhheAx15tUGnROCJyO3NAS/w=",
-          "dev": true,
-          "requires": {
-            "mkdirp": "~0.3.5"
-          }
-        },
-        "lodash": {
-          "version": "2.4.2",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-2.4.2.tgz",
-          "integrity": "sha1-+t2DS5aDBz2hebPq5tnA0VBT9z4=",
-          "dev": true
-        },
-        "mkdirp": {
-          "version": "0.3.5",
-          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.3.5.tgz",
-          "integrity": "sha1-3j5fiWHIjHh+4TaN+EmsRBPsqNc=",
-          "dev": true
-        }
-      }
-    },
     "grunt-execute": {
       "version": "0.1.5",
       "resolved": "https://registry.npmjs.org/grunt-execute/-/grunt-execute-0.1.5.tgz",
@@ -1525,26 +1538,6 @@
               "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc="
             }
           }
-        },
-        "npm-run-path": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-1.0.0.tgz",
-          "integrity": "sha1-9cMr9ZX+ga6Sfa7FLoL4sACsPI8=",
-          "requires": {
-            "path-key": "^1.0.0"
-          },
-          "dependencies": {
-            "path-key": {
-              "version": "1.0.0",
-              "resolved": "https://registry.npmjs.org/path-key/-/path-key-1.0.0.tgz",
-              "integrity": "sha1-XVPVeAGWRsDWiADbThRua9wqx68="
-            }
-          }
-        },
-        "object-assign": {
-          "version": "4.1.1",
-          "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
-          "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
         }
       }
     },
@@ -1563,12 +1556,6 @@
       "integrity": "sha512-LSBS2LjbNBTf6287JEbEzvJgftkF5qFkmCo9hDRpAzKhUOlJ+hx8dd4USs00SgsUNwc4617J9ki5YtEClM2ffA==",
       "dev": true
     },
-    "has-color": {
-      "version": "0.1.7",
-      "resolved": "https://registry.npmjs.org/has-color/-/has-color-0.1.7.tgz",
-      "integrity": "sha1-ZxRKUmDDT8PMpnfQQdr1L+e3iy8=",
-      "dev": true
-    },
     "has-flag": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
@@ -1749,6 +1736,11 @@
       "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=",
       "dev": true
     },
+    "jit-grunt": {
+      "version": "0.10.0",
+      "resolved": "https://registry.npmjs.org/jit-grunt/-/jit-grunt-0.10.0.tgz",
+      "integrity": "sha1-AIw6f+Hpa9DYTiYOofoXg0V/ecI="
+    },
     "js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -1827,98 +1819,6 @@
         "lodash": "~3.10.1"
       },
       "dependencies": {
-        "cson": {
-          "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/cson/-/cson-3.0.2.tgz",
-          "integrity": "sha1-g+6Qids8JUvsHpjkmNmqzxGtzFQ=",
-          "requires": {
-            "coffee-script": "^1.9.0",
-            "cson-parser": "^1.0.6",
-            "extract-opts": "^3.0.1",
-            "requirefresh": "^2.0.0",
-            "safefs": "^4.0.0"
-          },
-          "dependencies": {
-            "cson-parser": {
-              "version": "1.3.5",
-              "resolved": "https://registry.npmjs.org/cson-parser/-/cson-parser-1.3.5.tgz",
-              "integrity": "sha1-fsZ14DkUVTO/KmqFYHPxWZ2cLSQ=",
-              "requires": {
-                "coffee-script": "^1.10.0"
-              }
-            },
-            "extract-opts": {
-              "version": "3.3.1",
-              "resolved": "https://registry.npmjs.org/extract-opts/-/extract-opts-3.3.1.tgz",
-              "integrity": "sha1-WrvtyYwNUgLjJ4cn+Rktfghsa+E=",
-              "requires": {
-                "eachr": "^3.2.0",
-                "editions": "^1.1.1",
-                "typechecker": "^4.3.0"
-              },
-              "dependencies": {
-                "eachr": {
-                  "version": "3.2.0",
-                  "resolved": "https://registry.npmjs.org/eachr/-/eachr-3.2.0.tgz",
-                  "integrity": "sha1-LDXkPqCGUW95l8+At6pk1VpKRIQ=",
-                  "requires": {
-                    "editions": "^1.1.1",
-                    "typechecker": "^4.3.0"
-                  }
-                },
-                "editions": {
-                  "version": "1.3.4",
-                  "resolved": "https://registry.npmjs.org/editions/-/editions-1.3.4.tgz",
-                  "integrity": "sha512-gzao+mxnYDzIysXKMQi/+M1mjy/rjestjg6OPoYTtI+3Izp23oiGZitsl9lPDPiTGXbcSIk1iJWhliSaglxnUg=="
-                },
-                "typechecker": {
-                  "version": "4.4.1",
-                  "resolved": "https://registry.npmjs.org/typechecker/-/typechecker-4.4.1.tgz",
-                  "integrity": "sha1-+XuV9RsDhBchLWd9RaNz7nvO1+Y=",
-                  "requires": {
-                    "editions": "^1.3.3"
-                  }
-                }
-              }
-            },
-            "requirefresh": {
-              "version": "2.1.0",
-              "resolved": "https://registry.npmjs.org/requirefresh/-/requirefresh-2.1.0.tgz",
-              "integrity": "sha1-dC3Mwg86lpGNZsbxWX3I/+vE9vU=",
-              "requires": {
-                "editions": "^1.1.1"
-              },
-              "dependencies": {
-                "editions": {
-                  "version": "1.3.4",
-                  "resolved": "https://registry.npmjs.org/editions/-/editions-1.3.4.tgz",
-                  "integrity": "sha512-gzao+mxnYDzIysXKMQi/+M1mjy/rjestjg6OPoYTtI+3Izp23oiGZitsl9lPDPiTGXbcSIk1iJWhliSaglxnUg=="
-                }
-              }
-            },
-            "safefs": {
-              "version": "4.1.0",
-              "resolved": "https://registry.npmjs.org/safefs/-/safefs-4.1.0.tgz",
-              "integrity": "sha1-+CrrS9165R9lPrIPZyizBYyNZEU=",
-              "requires": {
-                "editions": "^1.1.1",
-                "graceful-fs": "^4.1.4"
-              },
-              "dependencies": {
-                "editions": {
-                  "version": "1.3.4",
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+      "dependencies": {
+        "graceful-fs": {
+          "version": "4.1.11",
+          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
+          "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg="
+        }
+      }
+    },
     "sax": {
       "version": "0.5.8",
       "resolved": "https://registry.npmjs.org/sax/-/sax-0.5.8.tgz",
@@ -2987,17 +2851,6 @@
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         "strip-ansi": "^6.0.0"
-      },
-      "dependencies": {
-        "strip-ansi": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
-          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^5.0.0"
-          }
-        }
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     "string.prototype.trimend": {
@@ -3027,10 +2880,13 @@
       "dev": true
     },
     "strip-ansi": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-0.1.1.tgz",
-      "integrity": "sha1-OeipjQRNFQZgq+SmgIrPcLt7yZE=",
-      "dev": true
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+      "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "^5.0.0"
+      }
     },
     "strip-bom": {
       "version": "3.0.0",
@@ -3084,15 +2940,6 @@
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           "dev": true
-        },
-        "strip-ansi": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
-          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^5.0.0"
-          }
         }
       }
     },
@@ -3102,6 +2949,16 @@
       "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
       "dev": true
     },
+    "thunky": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/thunky/-/thunky-0.1.0.tgz",
+      "integrity": "sha1-vzAUaCTituZ7Dy16Ssi+smkIaE4="
+    },
+    "to-mongodb-core": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/to-mongodb-core/-/to-mongodb-core-2.0.0.tgz",
+      "integrity": "sha1-NZbsdhOsmtO5ioncua77pWnNJ+s="
+    },
     "tsconfig-paths": {
       "version": "3.10.1",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.10.1.tgz",
@@ -3113,6 +2970,11 @@
         "strip-bom": "^3.0.0"
       }
     },
+    "twostep": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/twostep/-/twostep-0.4.2.tgz",
+      "integrity": "sha1-hLxQh6hxV00ev3vjB54D4SLUFbY="
+    },
     "type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -3128,6 +2990,14 @@
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       "dev": true
     },
+    "typechecker": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/typechecker/-/typechecker-4.4.1.tgz",
+      "integrity": "sha1-+XuV9RsDhBchLWd9RaNz7nvO1+Y=",
+      "requires": {
+        "editions": "^1.3.3"
+      }
+    },
     "unbox-primitive": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.1.tgz",
@@ -3204,8 +3074,7 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "xml2js": {
       "version": "0.2.8",
@@ -3216,6 +3085,11 @@
         "sax": "0.5.x"
       }
     },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    },
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
diff --git a/package.json b/package.json
index c46ac96be4..f7ef5fd095 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,6 @@
     "@overleaf/settings": "^2.1.1",
     "async": "^0.9.0",
     "bson": "^1.0.4",
-    "coffee-script": "^1.11.1",
     "east": "0.5.7",
     "east-mongo": "0.3.3",
     "grunt-shell": "^1.1.1",
@@ -41,7 +40,6 @@
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     "grunt-available-tasks": "~0.4.1",
     "grunt-concurrent": "~0.4.3",
-    "grunt-contrib-coffee": "~0.10.1",
     "prettier": "^2.2.1",
     "semver": "~2.2.1",
     "knox": "~0.8.9"