diff --git a/garden-service/package-lock.json b/garden-service/package-lock.json
index 52ced2b18f..23fdb8e7ac 100644
--- a/garden-service/package-lock.json
+++ b/garden-service/package-lock.json
@@ -402,7 +402,7 @@
     },
     "@types/async-lock": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/@types/async-lock/-/async-lock-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/@types/async-lock/-/async-lock-1.1.0.tgz",
       "integrity": "sha512-Eo8EXiqmChtkt0ETf6AQ8aiDHT3Tht6OuMSa3/9nfuyqFimp7ZwPMiufsA56A7ZUGBuwFzH860jO0d8n0lETtg==",
       "dev": true
     },
@@ -429,7 +429,7 @@
     },
     "@types/chokidar": {
       "version": "1.7.5",
-      "resolved": "http://registry.npmjs.org/@types/chokidar/-/chokidar-1.7.5.tgz",
+      "resolved": "https://registry.npmjs.org/@types/chokidar/-/chokidar-1.7.5.tgz",
       "integrity": "sha512-PDkSRY7KltW3M60hSBlerxI8SFPXsO3AL/aRVsO4Kh9IHRW74Ih75gUuTd/aE4LSSFqypb10UIX3QzOJwBQMGQ==",
       "dev": true,
       "requires": {
@@ -498,12 +498,12 @@
     },
     "@types/events": {
       "version": "1.2.0",
-      "resolved": "http://registry.npmjs.org/@types/events/-/events-1.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/@types/events/-/events-1.2.0.tgz",
       "integrity": "sha512-KEIlhXnIutzKwRbQkGWb/I4HFqBuUykAdHgDED6xqwXJfONCjF5VoE0cXEiurh3XauygxzeDzgtXUqvLkxFzzA=="
     },
     "@types/execa": {
       "version": "0.9.0",
-      "resolved": "http://registry.npmjs.org/@types/execa/-/execa-0.9.0.tgz",
+      "resolved": "https://registry.npmjs.org/@types/execa/-/execa-0.9.0.tgz",
       "integrity": "sha512-mgfd93RhzjYBUHHV532turHC2j4l/qxsF/PbfDmprHDEUHmNZGlDn1CEsulGK3AfsPdhkWzZQT/S/k0UGhLGsA==",
       "dev": true,
       "requires": {
@@ -749,13 +749,13 @@
     },
     "@types/path-is-inside": {
       "version": "1.0.0",
-      "resolved": "http://registry.npmjs.org/@types/path-is-inside/-/path-is-inside-1.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/@types/path-is-inside/-/path-is-inside-1.0.0.tgz",
       "integrity": "sha512-hfnXRGugz+McgX2jxyy5qz9sB21LRzlGn24zlwN2KEgoPtEvjzNRrLtUkOOebPDPZl3Rq7ywKxYvylVcEZDnEw==",
       "dev": true
     },
     "@types/prettyjson": {
       "version": "0.0.28",
-      "resolved": "http://registry.npmjs.org/@types/prettyjson/-/prettyjson-0.0.28.tgz",
+      "resolved": "https://registry.npmjs.org/@types/prettyjson/-/prettyjson-0.0.28.tgz",
       "integrity": "sha1-ExqJDe1kIbG1RfRRCkrqvG1GUnU=",
       "dev": true
     },
@@ -931,7 +931,7 @@
     },
     "@types/undertaker": {
       "version": "1.2.0",
-      "resolved": "http://registry.npmjs.org/@types/undertaker/-/undertaker-1.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/@types/undertaker/-/undertaker-1.2.0.tgz",
       "integrity": "sha512-bx/5nZCGkasXs6qaA3B6SVDjBZqdyk04UO12e0uEPSzjt5H8jEJw0DKe7O7IM0hM2bVHRh70pmOH7PEHqXwzOw==",
       "dev": true,
       "requires": {
@@ -992,7 +992,7 @@
     },
     "@types/wrap-ansi": {
       "version": "3.0.0",
-      "resolved": "http://registry.npmjs.org/@types/wrap-ansi/-/wrap-ansi-3.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/@types/wrap-ansi/-/wrap-ansi-3.0.0.tgz",
       "integrity": "sha512-ltIpx+kM7g/MLRZfkbL7EsCEjfzCcScLpkg37eXEtx5kmrAKBkTJwd1GIAjDSL8wTpM6Hzn5YO4pSb91BEwu1g==",
       "dev": true
     },
@@ -1075,7 +1075,7 @@
     },
     "ansi-colors": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/ansi-colors/-/ansi-colors-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-1.1.0.tgz",
       "integrity": "sha512-SFKX67auSNoVR38N3L+nvsPjOE0bybKTYbkf5tRvushrAPQ9V75huw0ZxBkKVeRU9kqH3d6HA4xTckbwZ4ixmA==",
       "dev": true,
       "requires": {
@@ -1412,7 +1412,7 @@
     },
     "axios": {
       "version": "0.18.0",
-      "resolved": "http://registry.npmjs.org/axios/-/axios-0.18.0.tgz",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.0.tgz",
       "integrity": "sha1-MtU+SFHv3AoRmTts0AB4nXDAUQI=",
       "requires": {
         "follow-redirects": "^1.3.0",
@@ -1444,7 +1444,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -1466,7 +1466,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -1991,7 +1991,7 @@
         },
         "wrap-ansi": {
           "version": "2.1.0",
-          "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
           "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
           "requires": {
             "string-width": "^1.0.1",
@@ -2010,7 +2010,7 @@
             },
             "strip-ansi": {
               "version": "3.0.1",
-              "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+              "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
               "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
               "requires": {
                 "ansi-regex": "^2.0.0"
@@ -2862,7 +2862,7 @@
     },
     "enabled": {
       "version": "1.0.2",
-      "resolved": "http://registry.npmjs.org/enabled/-/enabled-1.0.2.tgz",
+      "resolved": "https://registry.npmjs.org/enabled/-/enabled-1.0.2.tgz",
       "integrity": "sha1-ll9lE9LC0cX0ZStkouM5ZGf8L5M=",
       "requires": {
         "env-variable": "0.0.x"
@@ -3051,6 +3051,11 @@
         "es5-ext": "~0.10.14"
       }
     },
+    "eventemitter2": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/eventemitter2/-/eventemitter2-5.0.1.tgz",
+      "integrity": "sha1-YZegldX7a1folC9v1+qtY6CclFI="
+    },
     "execa": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/execa/-/execa-1.0.0.tgz",
@@ -3464,24 +3469,24 @@
       "dependencies": {
         "abbrev": {
           "version": "1.1.1",
-          "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+          "resolved": false,
           "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
           "optional": true
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "resolved": false,
           "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
         },
         "aproba": {
           "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+          "resolved": false,
           "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
           "optional": true
         },
         "are-we-there-yet": {
           "version": "1.1.4",
-          "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz",
+          "resolved": false,
           "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
           "optional": true,
           "requires": {
@@ -3491,12 +3496,12 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
         },
         "brace-expansion": {
           "version": "1.1.11",
-          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+          "resolved": false,
           "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
           "requires": {
             "balanced-match": "^1.0.0",
@@ -3505,34 +3510,34 @@
         },
         "chownr": {
           "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-4qdQQqlVGQi+vSW4Uj1fl2nXkYE=",
           "optional": true
         },
         "code-point-at": {
           "version": "1.1.0",
-          "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+          "resolved": false,
           "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
         },
         "concat-map": {
           "version": "0.0.1",
-          "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+          "resolved": false,
           "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
         },
         "core-util-is": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
           "optional": true
         },
         "debug": {
           "version": "2.6.9",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "resolved": false,
           "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
           "optional": true,
           "requires": {
@@ -3541,25 +3546,25 @@
         },
         "deep-extend": {
           "version": "0.5.1",
-          "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.5.1.tgz",
+          "resolved": false,
           "integrity": "sha512-N8vBdOa+DF7zkRrDCsaOXoCs/E2fJfx9B9MrKnnSiHNh4ws7eSys6YQE4KvT1cecKmOASYQBhbKjeuDD9lT81w==",
           "optional": true
         },
         "delegates": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
           "optional": true
         },
         "detect-libc": {
           "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
+          "resolved": false,
           "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=",
           "optional": true
         },
         "fs-minipass": {
           "version": "1.2.5",
-          "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.5.tgz",
+          "resolved": false,
           "integrity": "sha512-JhBl0skXjUPCFH7x6x61gQxrKyXsxB5gcgePLZCwfyCGGsTISMoIeObbrvVeP6Xmyaudw4TT43qV2Gz+iyd2oQ==",
           "optional": true,
           "requires": {
@@ -3568,13 +3573,13 @@
         },
         "fs.realpath": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
           "optional": true
         },
         "gauge": {
           "version": "2.7.4",
-          "resolved": "https://registry.npmjs.org/gauge/-/gauge-2.7.4.tgz",
+          "resolved": false,
           "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
           "optional": true,
           "requires": {
@@ -3590,7 +3595,7 @@
         },
         "glob": {
           "version": "7.1.2",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
+          "resolved": false,
           "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
           "optional": true,
           "requires": {
@@ -3604,13 +3609,13 @@
         },
         "has-unicode": {
           "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
           "optional": true
         },
         "iconv-lite": {
           "version": "0.4.21",
-          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.21.tgz",
+          "resolved": false,
           "integrity": "sha512-En5V9za5mBt2oUA03WGD3TwDv0MKAruqsuxstbMUZaj9W9k/m1CV/9py3l0L5kw9Bln8fdHQmzHSYtvpvTLpKw==",
           "optional": true,
           "requires": {
@@ -3619,7 +3624,7 @@
         },
         "ignore-walk": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/ignore-walk/-/ignore-walk-3.0.1.tgz",
+          "resolved": false,
           "integrity": "sha512-DTVlMx3IYPe0/JJcYP7Gxg7ttZZu3IInhuEhbchuqneY9wWe5Ojy2mXLBaQFUQmo0AW2r3qG7m1mg86js+gnlQ==",
           "optional": true,
           "requires": {
@@ -3628,7 +3633,7 @@
         },
         "inflight": {
           "version": "1.0.6",
-          "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
+          "resolved": false,
           "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
           "optional": true,
           "requires": {
@@ -3638,18 +3643,18 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+          "resolved": false,
           "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
         },
         "ini": {
           "version": "1.3.5",
-          "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.5.tgz",
+          "resolved": false,
           "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==",
           "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "requires": {
             "number-is-nan": "^1.0.0"
@@ -3657,13 +3662,13 @@
         },
         "isarray": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
           "optional": true
         },
         "minimatch": {
           "version": "3.0.4",
-          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
+          "resolved": false,
           "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
           "requires": {
             "brace-expansion": "^1.1.7"
@@ -3671,12 +3676,12 @@
         },
         "minimist": {
           "version": "0.0.8",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+          "resolved": false,
           "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
         },
         "minipass": {
           "version": "2.2.4",
-          "resolved": "https://registry.npmjs.org/minipass/-/minipass-2.2.4.tgz",
+          "resolved": false,
           "integrity": "sha512-hzXIWWet/BzWhYs2b+u7dRHlruXhwdgvlTMDKC6Cb1U7ps6Ac6yQlR39xsbjWJE377YTCtKwIXIpJ5oP+j5y8g==",
           "requires": {
             "safe-buffer": "^5.1.1",
@@ -3685,7 +3690,7 @@
         },
         "minizlib": {
           "version": "1.1.0",
-          "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-1.1.0.tgz",
+          "resolved": false,
           "integrity": "sha512-4T6Ur/GctZ27nHfpt9THOdRZNgyJ9FZchYO1ceg5S8Q3DNLCKYy44nCZzgCJgcvx2UM8czmqak5BCxJMrq37lA==",
           "optional": true,
           "requires": {
@@ -3694,7 +3699,7 @@
         },
         "mkdirp": {
           "version": "0.5.1",
-          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+          "resolved": false,
           "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
           "requires": {
             "minimist": "0.0.8"
@@ -3702,13 +3707,13 @@
         },
         "ms": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
           "optional": true
         },
         "needle": {
           "version": "2.2.0",
-          "resolved": "https://registry.npmjs.org/needle/-/needle-2.2.0.tgz",
+          "resolved": false,
           "integrity": "sha512-eFagy6c+TYayorXw/qtAdSvaUpEbBsDwDyxYFgLZ0lTojfH7K+OdBqAF7TAFwDokJaGpubpSGG0wO3iC0XPi8w==",
           "optional": true,
           "requires": {
@@ -3719,7 +3724,7 @@
         },
         "node-pre-gyp": {
           "version": "0.10.0",
-          "resolved": "https://registry.npmjs.org/node-pre-gyp/-/node-pre-gyp-0.10.0.tgz",
+          "resolved": false,
           "integrity": "sha512-G7kEonQLRbcA/mOoFoxvlMrw6Q6dPf92+t/l0DFSMuSlDoWaI9JWIyPwK0jyE1bph//CUEL65/Fz1m2vJbmjQQ==",
           "optional": true,
           "requires": {
@@ -3737,7 +3742,7 @@
         },
         "nopt": {
           "version": "4.0.1",
-          "resolved": "https://registry.npmjs.org/nopt/-/nopt-4.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-0NRoWv1UFRk8jHUFYC0NF81kR00=",
           "optional": true,
           "requires": {
@@ -3747,13 +3752,13 @@
         },
         "npm-bundled": {
           "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/npm-bundled/-/npm-bundled-1.0.3.tgz",
+          "resolved": false,
           "integrity": "sha512-ByQ3oJ/5ETLyglU2+8dBObvhfWXX8dtPZDMePCahptliFX2iIuhyEszyFk401PZUNQH20vvdW5MLjJxkwU80Ow==",
           "optional": true
         },
         "npm-packlist": {
           "version": "1.1.10",
-          "resolved": "https://registry.npmjs.org/npm-packlist/-/npm-packlist-1.1.10.tgz",
+          "resolved": false,
           "integrity": "sha512-AQC0Dyhzn4EiYEfIUjCdMl0JJ61I2ER9ukf/sLxJUcZHfo+VyEfz2rMJgLZSS1v30OxPQe1cN0LZA1xbcaVfWA==",
           "optional": true,
           "requires": {
@@ -3763,7 +3768,7 @@
         },
         "npmlog": {
           "version": "4.1.2",
-          "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-4.1.2.tgz",
+          "resolved": false,
           "integrity": "sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==",
           "optional": true,
           "requires": {
@@ -3775,18 +3780,18 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
         },
         "object-assign": {
           "version": "4.1.1",
-          "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+          "resolved": false,
           "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=",
           "optional": true
         },
         "once": {
           "version": "1.4.0",
-          "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+          "resolved": false,
           "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
           "requires": {
             "wrappy": "1"
@@ -3794,19 +3799,19 @@
         },
         "os-homedir": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
           "optional": true
         },
         "os-tmpdir": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
           "optional": true
         },
         "osenv": {
           "version": "0.1.5",
-          "resolved": "https://registry.npmjs.org/osenv/-/osenv-0.1.5.tgz",
+          "resolved": false,
           "integrity": "sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==",
           "optional": true,
           "requires": {
@@ -3816,19 +3821,19 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
           "optional": true
         },
         "process-nextick-args": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
+          "resolved": false,
           "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
           "optional": true
         },
         "rc": {
           "version": "1.2.7",
-          "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.7.tgz",
+          "resolved": false,
           "integrity": "sha512-LdLD8xD4zzLsAT5xyushXDNscEjB7+2ulnl8+r1pnESlYtlJtVSoCMBGr30eDRJ3+2Gq89jK9P9e4tCEH1+ywA==",
           "optional": true,
           "requires": {
@@ -3840,7 +3845,7 @@
           "dependencies": {
             "minimist": {
               "version": "1.2.0",
-              "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+              "resolved": false,
               "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
               "optional": true
             }
@@ -3848,7 +3853,7 @@
         },
         "readable-stream": {
           "version": "2.3.6",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "resolved": false,
           "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
           "optional": true,
           "requires": {
@@ -3863,7 +3868,7 @@
         },
         "rimraf": {
           "version": "2.6.2",
-          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.2.tgz",
+          "resolved": false,
           "integrity": "sha512-lreewLK/BlghmxtfH36YYVg1i8IAce4TI7oao75I1g245+6BctqTVQiBP3YUJ9C6DQOXJmkYR9X9fCLtCOJc5w==",
           "optional": true,
           "requires": {
@@ -3872,42 +3877,42 @@
         },
         "safe-buffer": {
           "version": "5.1.1",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
+          "resolved": false,
           "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg=="
         },
         "safer-buffer": {
           "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+          "resolved": false,
           "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
           "optional": true
         },
         "sax": {
           "version": "1.2.4",
-          "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
+          "resolved": false,
           "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
           "optional": true
         },
         "semver": {
           "version": "5.5.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
+          "resolved": false,
           "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA==",
           "optional": true
         },
         "set-blocking": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+          "resolved": false,
           "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
           "optional": true
         },
         "signal-exit": {
           "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
           "optional": true
         },
         "string-width": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "requires": {
             "code-point-at": "^1.0.0",
@@ -3917,7 +3922,7 @@
         },
         "string_decoder": {
           "version": "1.1.1",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "resolved": false,
           "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
           "optional": true,
           "requires": {
@@ -3926,7 +3931,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
             "ansi-regex": "^2.0.0"
@@ -3934,13 +3939,13 @@
         },
         "strip-json-comments": {
           "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+          "resolved": false,
           "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
           "optional": true
         },
         "tar": {
           "version": "4.4.1",
-          "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.1.tgz",
+          "resolved": false,
           "integrity": "sha512-O+v1r9yN4tOsvl90p5HAP4AEqbYhx4036AGMm075fH9F8Qwi3oJ+v4u50FkT/KkvywNGtwkk0zRI+8eYm1X/xg==",
           "optional": true,
           "requires": {
@@ -3955,13 +3960,13 @@
         },
         "util-deprecate": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
           "optional": true
         },
         "wide-align": {
           "version": "1.1.2",
-          "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
+          "resolved": false,
           "integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
           "optional": true,
           "requires": {
@@ -3970,12 +3975,12 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
         },
         "yallist": {
           "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.2.tgz",
+          "resolved": false,
           "integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k="
         }
       }
@@ -4349,7 +4354,7 @@
         },
         "load-json-file": {
           "version": "1.1.0",
-          "resolved": "http://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
           "integrity": "sha1-lWkFcI1YtLq0wiYbBPWfMcmTdMA=",
           "dev": true,
           "requires": {
@@ -4362,7 +4367,7 @@
         },
         "os-locale": {
           "version": "1.4.0",
-          "resolved": "http://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
+          "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
           "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
           "dev": true,
           "requires": {
@@ -4400,7 +4405,7 @@
         },
         "pify": {
           "version": "2.3.0",
-          "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
           "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
           "dev": true
         },
@@ -4438,7 +4443,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -4462,7 +4467,7 @@
         },
         "wrap-ansi": {
           "version": "2.1.0",
-          "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
           "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
           "dev": true,
           "requires": {
@@ -4567,7 +4572,7 @@
       "dependencies": {
         "chalk": {
           "version": "2.3.1",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-2.3.1.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.3.1.tgz",
           "integrity": "sha512-QUU4ofkDoMIVO7hcx1iPTISs88wsO8jA92RQIm4JAwZvFGGAV2hSAA1NX7oVj2Ej2Q6NDTcRDjPTFrMCRZoJ6g==",
           "dev": true,
           "requires": {
@@ -4640,7 +4645,7 @@
         },
         "chalk": {
           "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -4701,7 +4706,7 @@
         },
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         },
@@ -4719,7 +4724,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
@@ -5135,7 +5140,7 @@
     },
     "is-builtin-module": {
       "version": "1.0.0",
-      "resolved": "http://registry.npmjs.org/is-builtin-module/-/is-builtin-module-1.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/is-builtin-module/-/is-builtin-module-1.0.0.tgz",
       "integrity": "sha1-VAVy0096wxGfj3bDDLwbHgN6/74=",
       "dev": true,
       "requires": {
@@ -6324,7 +6329,7 @@
     },
     "minimist": {
       "version": "0.0.8",
-      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
       "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
     },
     "minimist-options": {
@@ -6400,7 +6405,7 @@
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "requires": {
         "minimist": "0.0.8"
@@ -6713,7 +6718,7 @@
         },
         "lodash": {
           "version": "2.4.1",
-          "resolved": "http://registry.npmjs.org/lodash/-/lodash-2.4.1.tgz",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-2.4.1.tgz",
           "integrity": "sha1-W3cjA03aTSYuWkb7LFjXzCL3FCA=",
           "dev": true
         }
@@ -8535,7 +8540,7 @@
     },
     "pegjs": {
       "version": "0.10.0",
-      "resolved": "http://registry.npmjs.org/pegjs/-/pegjs-0.10.0.tgz",
+      "resolved": "https://registry.npmjs.org/pegjs/-/pegjs-0.10.0.tgz",
       "integrity": "sha1-z4uvrm7d/0tafvsYUmnqr0YQ3b0=",
       "dev": true
     },
@@ -8567,7 +8572,7 @@
     },
     "pkijs": {
       "version": "1.3.33",
-      "resolved": "http://registry.npmjs.org/pkijs/-/pkijs-1.3.33.tgz",
+      "resolved": "https://registry.npmjs.org/pkijs/-/pkijs-1.3.33.tgz",
       "integrity": "sha1-ponvYhE7fDSOH/wJll0iOeW7TJI="
     },
     "plugin-error": {
@@ -8594,7 +8599,7 @@
     },
     "pretty-hrtime": {
       "version": "1.0.3",
-      "resolved": "http://registry.npmjs.org/pretty-hrtime/-/pretty-hrtime-1.0.3.tgz",
+      "resolved": "https://registry.npmjs.org/pretty-hrtime/-/pretty-hrtime-1.0.3.tgz",
       "integrity": "sha1-t+PqQkNaTJsnWdmeDyAesZWALuE=",
       "dev": true
     },
@@ -8786,7 +8791,7 @@
     },
     "readable-stream": {
       "version": "2.3.6",
-      "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
       "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
       "requires": {
         "core-util-is": "~1.0.0",
@@ -9072,7 +9077,7 @@
     },
     "safe-regex": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
       "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
       "requires": {
         "ret": "~0.1.10"
@@ -9209,7 +9214,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         },
@@ -10073,7 +10078,7 @@
     },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8="
     },
     "strip-indent": {
@@ -10255,7 +10260,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU="
     },
     "through2": {
@@ -10290,6 +10295,12 @@
       "integrity": "sha1-dkpaEa9QVhkhsTPztE5hhofg9cM=",
       "dev": true
     },
+    "timekeeper": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/timekeeper/-/timekeeper-2.1.2.tgz",
+      "integrity": "sha512-fc1DDqbiyz5vxRO4xkiATwfWUw1FV7W20+FJYal1SnoIYgNuB4WNxYLtbG3zjUBwOSk3P4u1TgBAZYG/aqBWMw==",
+      "dev": true
+    },
     "timers-ext": {
       "version": "0.1.5",
       "resolved": "https://registry.npmjs.org/timers-ext/-/timers-ext-0.1.5.tgz",
@@ -10467,7 +10478,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -11097,7 +11108,7 @@
     },
     "yargs": {
       "version": "11.1.0",
-      "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
       "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
       "requires": {
         "cliui": "^4.0.0",
diff --git a/garden-service/package.json b/garden-service/package.json
index 4722115848..a1beec5006 100644
--- a/garden-service/package.json
+++ b/garden-service/package.json
@@ -45,6 +45,7 @@
     "dockerode": "^2.5.7",
     "elegant-spinner": "^1.0.1",
     "escape-string-regexp": "^1.0.5",
+    "eventemitter2": "^5.0.1",
     "execa": "^1.0.0",
     "fs-extra": "^7.0.0",
     "get-port": "^4.0.0",
@@ -138,6 +139,7 @@
     "snyk": "^1.105.0",
     "testdouble": "^3.8.2",
     "testdouble-chai": "^0.5.0",
+    "timekeeper": "^2.1.2",
     "tmp-promise": "^1.0.5",
     "ts-node": "^7.0.1",
     "tslint": "^5.11.0",
diff --git a/garden-service/src/events.ts b/garden-service/src/events.ts
new file mode 100644
index 0000000000..51027d7a18
--- /dev/null
+++ b/garden-service/src/events.ts
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2018 Garden Technologies, Inc. <info@garden.io>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+import { EventEmitter2 } from "eventemitter2"
+import { TaskResult } from "./task-graph"
+import { ModuleVersion } from "./vcs/base"
+
+/**
+ * This simple class serves as the central event bus for a Garden instance. Its function
+ * is mainly to consolidate all events for the instance, to ensure type-safety.
+ *
+ * See below for the event interfaces.
+ */
+export class EventBus extends EventEmitter2 {
+  constructor() {
+    super({
+      wildcard: false,
+      newListener: false,
+      maxListeners: 100,    // we may need to adjust this
+    })
+  }
+
+  emit<T extends EventName>(name: T, payload: Events[T]) {
+    return super.emit(name, payload)
+  }
+
+  on<T extends EventName>(name: T, listener: (payload: Events[T]) => void) {
+    return super.on(name, listener)
+  }
+
+  onAny(listener: <T extends EventName>(name: T, payload: Events[T]) => void) {
+    return super.onAny(<any>listener)
+  }
+
+  once<T extends EventName>(name: T, listener: (payload: Events[T]) => void) {
+    return super.once(name, listener)
+  }
+
+  // TODO: wrap more methods to make them type-safe
+}
+
+/**
+ * The supported events and their interfaces.
+ */
+export interface Events {
+  _test: string,
+  taskPending: {
+    addedAt: Date,
+    key: string,
+    version: ModuleVersion,
+  },
+  taskComplete: TaskResult,
+  taskError: TaskResult,
+}
+
+export type EventName = keyof Events
diff --git a/garden-service/src/garden.ts b/garden-service/src/garden.ts
index 4ed440a24c..01812d228d 100644
--- a/garden-service/src/garden.ts
+++ b/garden-service/src/garden.ts
@@ -107,6 +107,7 @@ import { ModuleAndRuntimeActions, Plugins, RegisterPluginParam } from "./types/p
 import { SUPPORTED_PLATFORMS, SupportedPlatform } from "./constants"
 import { platform, arch } from "os"
 import { LogEntry } from "./logger/log-entry"
+import { EventBus } from "./events"
 
 export interface ActionHandlerMap<T extends keyof PluginActions> {
   [actionName: string]: PluginActions[T]
@@ -159,6 +160,7 @@ export class Garden {
   public readonly vcs: VcsHandler
   public readonly cache: TreeCache
   public readonly actions: ActionHelper
+  public readonly events: EventBus
 
   constructor(
     public readonly projectRoot: string,
@@ -203,12 +205,15 @@ export class Garden {
     this.actionHandlers = <PluginActionMap>fromPairs(pluginActionNames.map(n => [n, {}]))
     this.moduleActionHandlers = <ModuleActionMap>fromPairs(moduleActionNames.map(n => [n, {}]))
 
-    this.taskGraph = new TaskGraph(this.log)
+    this.taskGraph = new TaskGraph(this, this.log)
     this.actions = new ActionHelper(this)
     this.hotReloadScheduler = new HotReloadScheduler()
+    this.events = new EventBus()
   }
 
-  static async factory(currentDirectory: string, { env, config, log, plugins = {} }: ContextOpts = {}) {
+  static async factory<T extends typeof Garden>(
+    this: T, currentDirectory: string, { env, config, log, plugins = {} }: ContextOpts = {},
+  ): Promise<InstanceType<T>> {
     let parsedConfig: GardenConfig
 
     if (config) {
@@ -288,7 +293,7 @@ export class Garden {
 
     const buildDir = await BuildDir.factory(projectRoot)
 
-    const garden = new Garden(
+    const garden = new this(
       projectRoot,
       projectName,
       environmentName,
@@ -296,17 +301,18 @@ export class Garden {
       projectSources,
       buildDir,
       log,
-    )
+    ) as InstanceType<T>
 
     // Register plugins
     for (const [name, pluginFactory] of Object.entries({ ...builtinPlugins, ...plugins })) {
-      garden.registerPlugin(name, pluginFactory)
+      // This cast is required for the linter to accept the instance type hackery.
+      (<Garden>garden).registerPlugin(name, pluginFactory)
     }
 
     // Load configured plugins
     // Validate configuration
     for (const provider of Object.values(mergedProviderConfigs)) {
-      await garden.loadPlugin(provider.name, provider)
+      await (<Garden>garden).loadPlugin(provider.name, provider)
     }
 
     return garden
diff --git a/garden-service/src/task-graph.ts b/garden-service/src/task-graph.ts
index 271c9b1e36..cf3804eada 100644
--- a/garden-service/src/task-graph.ts
+++ b/garden-service/src/task-graph.ts
@@ -14,6 +14,7 @@ import { BaseTask, TaskDefinitionError } from "./tasks/base"
 
 import { LogEntry } from "./logger/log-entry"
 import { toGardenError } from "./exceptions"
+import { Garden } from "./garden"
 
 class TaskGraphError extends Error { }
 
@@ -45,7 +46,7 @@ export class TaskGraph {
   private resultCache: ResultCache
   private opQueue: PQueue
 
-  constructor(private log: LogEntry, private concurrency: number = DEFAULT_CONCURRENCY) {
+  constructor(private garden: Garden, private log: LogEntry, private concurrency: number = DEFAULT_CONCURRENCY) {
     this.roots = new TaskNodeMap()
     this.index = new TaskNodeMap()
     this.inProgress = new TaskNodeMap()
@@ -87,6 +88,13 @@ export class TaskGraph {
     }
 
     this.index.addNode(node)
+
+    this.garden.events.emit("taskPending", {
+      addedAt: new Date(),
+      key: node.getKey(),
+      version: task.version,
+    })
+
     await this.addDependencies(node)
 
     if (node.getDependencies().length === 0) {
@@ -142,8 +150,10 @@ export class TaskGraph {
 
           try {
             result = await node.process(dependencyResults)
+            this.garden.events.emit("taskComplete", result)
           } catch (error) {
             result = { type, description, error }
+            this.garden.events.emit("taskError", result)
             this.logTaskError(node, error)
             this.cancelDependants(node)
           } finally {
diff --git a/garden-service/src/util/util.ts b/garden-service/src/util/util.ts
index 7944fb2529..9301b79417 100644
--- a/garden-service/src/util/util.ts
+++ b/garden-service/src/util/util.ts
@@ -35,6 +35,7 @@ export type HookCallback = (callback?: () => void) => void
 
 const exitHookNames: string[] = [] // For debugging/testing/inspection purposes
 
+export type ValueOf<T> = T[keyof T]
 export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>
 export type Diff<T, U> = T extends U ? never : T
 export type Nullable<T> = { [P in keyof T]: T[P] | null }
diff --git a/garden-service/test/helpers.ts b/garden-service/test/helpers.ts
index b28748bc42..cd2a3b77c5 100644
--- a/garden-service/test/helpers.ts
+++ b/garden-service/test/helpers.ts
@@ -12,9 +12,7 @@ import { remove, readdirSync, existsSync } from "fs-extra"
 import { containerModuleSpecSchema } from "../src/plugins/container"
 import { testGenericModule, buildGenericModule } from "../src/plugins/generic"
 import { TaskResults } from "../src/task-graph"
-import {
-  validate,
-} from "../src/config/common"
+import { validate, PrimitiveMap } from "../src/config/common"
 import {
   GardenPlugin,
   PluginActions,
@@ -34,13 +32,14 @@ import {
   RunTaskParams,
   SetSecretParams,
 } from "../src/types/plugin/params"
-import {
-  helpers,
-} from "../src/vcs/git"
-import {
-  ModuleVersion,
-} from "../src/vcs/base"
+import { helpers } from "../src/vcs/git"
+import { ModuleVersion } from "../src/vcs/base"
 import { GARDEN_DIR_NAME } from "../src/constants"
+import { EventBus, Events } from "../src/events"
+import { ValueOf } from "../src/util/util"
+import { SourceConfig } from "../src/config/project"
+import { BuildDir } from "../src/build-dir"
+import timekeeper = require("timekeeper")
 
 export const dataDir = resolve(__dirname, "data")
 export const examplesDir = resolve(__dirname, "..", "..", "examples")
@@ -230,7 +229,46 @@ export const makeTestModule = (params: Partial<ModuleConfig> = {}) => {
   return { ...defaultModuleConfig, ...params }
 }
 
-export const makeTestGarden = async (projectRoot: string, extraPlugins: Plugins = {}) => {
+interface EventLogEntry {
+  name: string
+  payload: ValueOf<Events>
+}
+
+/**
+ * Used for test Garden instances, to log emitted events.
+ */
+class TestEventBus extends EventBus {
+  log: EventLogEntry[]
+
+  constructor() {
+    super()
+    this.log = []
+  }
+
+  emit<T extends keyof Events>(name: T, payload: Events[T]) {
+    this.log.push({ name, payload })
+    return super.emit(name, payload)
+  }
+}
+
+export class TestGarden extends Garden {
+  events: TestEventBus
+
+  constructor(
+    public readonly projectRoot: string,
+    public readonly projectName: string,
+    environmentName: string,
+    variables: PrimitiveMap,
+    public readonly projectSources: SourceConfig[] = [],
+    public readonly buildDir: BuildDir,
+    log?,
+  ) {
+    super(projectRoot, projectName, environmentName, variables, projectSources, buildDir, log)
+    this.events = new TestEventBus()
+  }
+}
+
+export const makeTestGarden = async (projectRoot: string, extraPlugins: Plugins = {}): Promise<TestGarden> => {
   const testPlugins = {
     "test-plugin": testPlugin,
     "test-plugin-b": testPluginB,
@@ -238,7 +276,7 @@ export const makeTestGarden = async (projectRoot: string, extraPlugins: Plugins
   }
   const plugins = { ...testPlugins, ...extraPlugins }
 
-  return Garden.factory(projectRoot, { plugins })
+  return TestGarden.factory(projectRoot, { plugins })
 }
 
 export const makeTestGardenA = async (extraPlugins: Plugins = {}) => {
@@ -319,3 +357,11 @@ export function getExampleProjects() {
   const names = readdirSync(examplesDir).filter(n => existsSync(join(examplesDir, n, "garden.yml")))
   return fromPairs(names.map(n => [n, join(examplesDir, n)]))
 }
+
+export function freezeTime(date?: Date) {
+  if (!date) {
+    date = new Date()
+  }
+  timekeeper.freeze(date)
+  return date
+}
diff --git a/garden-service/test/setup.ts b/garden-service/test/setup.ts
index ec0b224641..fd7113904d 100644
--- a/garden-service/test/setup.ts
+++ b/garden-service/test/setup.ts
@@ -1,4 +1,5 @@
 import * as td from "testdouble"
+import * as timekeeper from "timekeeper"
 import { Logger } from "../src/logger/logger"
 import { LogLevel } from "../src/logger/log-node"
 import { makeTestGardenA } from "./helpers"
@@ -18,4 +19,7 @@ before(async function(this: any) {
 })
 
 beforeEach(() => { })
-afterEach(() => td.reset())
+afterEach(() => {
+  td.reset()
+  timekeeper.reset()
+})
diff --git a/garden-service/test/src/events.ts b/garden-service/test/src/events.ts
new file mode 100644
index 0000000000..3782af7688
--- /dev/null
+++ b/garden-service/test/src/events.ts
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 Garden Technologies, Inc. <info@garden.io>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+import { EventBus } from "../../src/events"
+import { expect } from "chai"
+
+describe("EventBus", () => {
+  let events: EventBus
+
+  beforeEach(() => {
+    events = new EventBus()
+  })
+
+  it("should send+receive events", (done) => {
+    events.on("_test", (payload) => {
+      expect(payload).to.equal("foo")
+      done()
+    })
+    events.emit("_test", "foo")
+  })
+
+  describe("onAny", () => {
+    it("should add listener for any supported event", (done) => {
+      events.onAny((name, payload) => {
+        expect(name).to.equal("_test")
+        expect(payload).to.equal("foo")
+        done()
+      })
+      events.emit("_test", "foo")
+    })
+  })
+
+  describe("once", () => {
+    it("should add a listener that only gets called once", (done) => {
+      events.once("_test", (payload) => {
+        expect(payload).to.equal("foo")
+        done()
+      })
+      events.emit("_test", "foo")
+      events.emit("_test", "bar")
+    })
+  })
+})
diff --git a/garden-service/test/src/task-graph.ts b/garden-service/test/src/task-graph.ts
index 78bece8c56..f5ecb93201 100644
--- a/garden-service/test/src/task-graph.ts
+++ b/garden-service/test/src/task-graph.ts
@@ -6,7 +6,7 @@ import {
   TaskResult,
   TaskResults,
 } from "../../src/task-graph"
-import { makeTestGarden } from "../helpers"
+import { makeTestGarden, freezeTime } from "../helpers"
 import { Garden } from "../../src/garden"
 import { DependencyGraphNodeType } from "../../src/dependency-graph"
 
@@ -16,6 +16,7 @@ type TestTaskCallback = (name: string, result: any) => Promise<void>
 
 interface TestTaskOptions {
   callback?: TestTaskCallback
+  dependencies?: BaseTask[],
   id?: string
   throwError?: boolean
 }
@@ -31,7 +32,6 @@ class TestTask extends BaseTask {
   constructor(
     garden: Garden,
     name: string,
-    dependencies?: BaseTask[],
     options?: TestTaskOptions,
   ) {
     super({
@@ -43,14 +43,16 @@ class TestTask extends BaseTask {
         dependencyVersions: {},
       },
     })
-    this.name = name
-    this.callback = (options && options.callback) || null
-    this.id = (options && options.id) || ""
-    this.throwError = !!(options && options.throwError)
 
-    if (dependencies) {
-      this.dependencies = dependencies
+    if (!options) {
+      options = {}
     }
+
+    this.name = name
+    this.callback = options.callback || null
+    this.id = options.id || ""
+    this.throwError = !!options.throwError
+    this.dependencies = options.dependencies || []
   }
 
   getName() {
@@ -93,7 +95,7 @@ describe("task-graph", () => {
 
     it("should successfully process a single task without dependencies", async () => {
       const garden = await getGarden()
-      const graph = new TaskGraph(garden.log)
+      const graph = new TaskGraph(garden, garden.log)
       const task = new TestTask(garden, "a")
 
       await graph.addTask(task)
@@ -114,9 +116,55 @@ describe("task-graph", () => {
       expect(results).to.eql(expected)
     })
 
+    it("should emit a taskPending event when adding a task", async () => {
+      const now = freezeTime()
+
+      const garden = await getGarden()
+      const graph = new TaskGraph(garden, garden.log)
+      const task = new TestTask(garden, "a")
+
+      await graph.addTask(task)
+
+      expect(garden.events.log).to.eql([
+        { name: "taskPending", payload: { addedAt: now, key: task.getKey(), version: task.version } },
+      ])
+    })
+
+    it("should emit a taskComplete event when completing a task", async () => {
+      const now = freezeTime()
+
+      const garden = await getGarden()
+      const graph = new TaskGraph(garden, garden.log)
+      const task = new TestTask(garden, "a")
+
+      await graph.addTask(task)
+      const result = await graph.processTasks()
+
+      expect(garden.events.log).to.eql([
+        { name: "taskPending", payload: { addedAt: now, key: task.getKey(), version: task.version } },
+        { name: "taskComplete", payload: result["a"] },
+      ])
+    })
+
+    it("should emit a taskError event when failing a task", async () => {
+      const now = freezeTime()
+
+      const garden = await getGarden()
+      const graph = new TaskGraph(garden, garden.log)
+      const task = new TestTask(garden, "a", { throwError: true })
+
+      await graph.addTask(task)
+      const result = await graph.processTasks()
+
+      expect(garden.events.log).to.eql([
+        { name: "taskPending", payload: { addedAt: now, key: task.getKey(), version: task.version } },
+        { name: "taskError", payload: result["a"] },
+      ])
+    })
+
     it("should process multiple tasks in dependency order", async () => {
       const garden = await getGarden()
-      const graph = new TaskGraph(garden.log)
+      const graph = new TaskGraph(garden, garden.log)
 
       const callbackResults = {}
       const resultOrder: string[] = []
@@ -128,10 +176,10 @@ describe("task-graph", () => {
 
       const opts = { callback }
 
-      const taskA = new TestTask(garden, "a", [], opts)
-      const taskB = new TestTask(garden, "b", [taskA], opts)
-      const taskC = new TestTask(garden, "c", [taskB], opts)
-      const taskD = new TestTask(garden, "d", [taskB, taskC], opts)
+      const taskA = new TestTask(garden, "a", { ...opts })
+      const taskB = new TestTask(garden, "b", { ...opts, dependencies: [taskA] })
+      const taskC = new TestTask(garden, "c", { ...opts, dependencies: [taskB] })
+      const taskD = new TestTask(garden, "d", { ...opts, dependencies: [taskB, taskC] })
 
       // we should be able to add tasks multiple times and in any order
       await graph.addTask(taskC)
@@ -208,7 +256,7 @@ describe("task-graph", () => {
 
     it("should recursively cancel a task's dependants when it throws an error", async () => {
       const garden = await getGarden()
-      const graph = new TaskGraph(garden.log)
+      const graph = new TaskGraph(garden, garden.log)
 
       const resultOrder: string[] = []
 
@@ -218,10 +266,10 @@ describe("task-graph", () => {
 
       const opts = { callback }
 
-      const taskA = new TestTask(garden, "a", [], opts)
-      const taskB = new TestTask(garden, "b", [taskA], { callback, throwError: true })
-      const taskC = new TestTask(garden, "c", [taskB], opts)
-      const taskD = new TestTask(garden, "d", [taskB, taskC], opts)
+      const taskA = new TestTask(garden, "a", { ...opts })
+      const taskB = new TestTask(garden, "b", { callback, throwError: true, dependencies: [taskA] })
+      const taskC = new TestTask(garden, "c", { ...opts, dependencies: [taskB] })
+      const taskD = new TestTask(garden, "d", { ...opts, dependencies: [taskB, taskC] })
 
       await graph.addTask(taskA)
       await graph.addTask(taskB)
@@ -249,7 +297,7 @@ describe("task-graph", () => {
       "should process a task as an inheritor of an existing, in-progress task when they have the same base key",
       async () => {
         const garden = await getGarden()
-        const graph = new TaskGraph(garden.log)
+        const graph = new TaskGraph(garden, garden.log)
 
         let callbackResults = {}
         let resultOrder: string[] = []
@@ -287,19 +335,20 @@ describe("task-graph", () => {
           callbackResults[key] = result
         }
 
-        const dependencyA = new TestTask(garden, "dependencyA", [], { callback: defaultCallback })
-        const dependencyB = new TestTask(garden, "dependencyB", [], { callback: defaultCallback })
+        const dependencyA = new TestTask(garden, "dependencyA", { callback: defaultCallback })
+        const dependencyB = new TestTask(garden, "dependencyB", { callback: defaultCallback })
         const parentTask = new TestTask(
           garden,
           "sharedName",
-          [dependencyA, dependencyB],
-          { callback: parentCallback, id: "1" },
+          { callback: parentCallback, id: "1", dependencies: [dependencyA, dependencyB] },
         )
-        const dependantA = new TestTask(garden, "dependantA", [parentTask], { callback: defaultCallback })
-        const dependantB = new TestTask(garden, "dependantB", [parentTask], { callback: defaultCallback })
+        const dependantA = new TestTask(garden, "dependantA", { callback: defaultCallback, dependencies: [parentTask] })
+        const dependantB = new TestTask(garden, "dependantB", { callback: defaultCallback, dependencies: [parentTask] })
 
-        const inheritorTask = new TestTask(garden,
-          "sharedName", [dependencyA, dependencyB], { callback: defaultCallback, id: "2" },
+        const inheritorTask = new TestTask(
+          garden,
+          "sharedName",
+          { callback: defaultCallback, id: "2", dependencies: [dependencyA, dependencyB] },
         )
 
         await graph.addTask(dependencyA)