diff --git a/.circleci/config.yml b/.circleci/config.yml
index e8f47d54..27581411 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -314,6 +314,16 @@ jobs:
           paths:
             - built
 
+  npm-test-ES3:
+    docker:
+      - image: node:lts-buster
+    steps:
+      - checkout
+      - attach_workspace:
+          at: npm-package
+      - run: npm install es-check
+      - run: npx es-check es3 npm-package/hiplot/dist/hiplot.lib.js
+
   npm-test:
     docker:
       - image: node:lts-buster
@@ -539,6 +549,12 @@ workflows:
           filters:
             tags:
               only: /.*/
+      - npm-test-ES3:
+          requires:
+            - npm-build
+          filters:
+            tags:
+              only: /.*/
       - mypy_pytest:
           requires:
             - npm-build
@@ -604,6 +620,7 @@ workflows:
           requires:
             - pypi-build
             - npm-build
+            - npm-test-ES3
             - npm-test
             - docs-build
             - browser-jupyter-chrome
@@ -621,6 +638,7 @@ workflows:
           requires:
             - pypi-build
             - npm-build
+            - npm-test-ES3
             - npm-test
             - docs-build
             - browser-jupyter-chrome
diff --git a/package-lock.json b/package-lock.json
index 2ca77069..35bb1b0d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,7 +21,7 @@
         "@types/source-map": "^0.5.7",
         "@types/underscore": "^1.10.24",
         "bootstrap": "^4.6.0",
-        "colorsys": "^1.0.22",
+        "color": "^4.0.0",
         "css-loader": "^5.2.6",
         "d3": "^5.16.0",
         "datatables.net-bs4": "^1.10.23",
@@ -30,6 +30,7 @@
         "datatables.net-colreorder-bs4": "^1.5.3",
         "datatables.net-fixedheader-bs4": "^3.1.7",
         "datatables.net-responsive-bs4": "^2.2.7",
+        "es-check": "^5.2.4",
         "file-loader": "^5.1.0",
         "hoist-non-react-statics": "^3.3.2",
         "imports-loader": "^3.0.0",
@@ -1823,6 +1824,21 @@
         "ajv": "^6.9.1"
       }
     },
+    "node_modules/ansi": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/ansi/-/ansi-0.3.1.tgz",
+      "integrity": "sha1-DELU+xcWDVqa8eSEus4cZpIsGyE=",
+      "dev": true
+    },
+    "node_modules/ansi-escapes": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
+      "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/ansi-regex": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
@@ -1868,6 +1884,16 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "dev": true,
+      "dependencies": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      }
+    },
     "node_modules/arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -2254,6 +2280,26 @@
         "node": ">=6"
       }
     },
+    "node_modules/caporal": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/caporal/-/caporal-1.4.0.tgz",
+      "integrity": "sha512-3pWfIwKVdIbB/gWmpLloO6iGAXTRi9mcTinPOwvHfzH3BYjOhLgq2XRG3hKtp+F6vBcBXxMgCobUzBAx1d8T4A==",
+      "dev": true,
+      "dependencies": {
+        "bluebird": "^3.4.7",
+        "cli-table3": "^0.5.0",
+        "colorette": "^1.0.1",
+        "fast-levenshtein": "^2.0.6",
+        "lodash": "^4.17.14",
+        "micromist": "1.1.0",
+        "prettyjson": "^1.2.1",
+        "tabtab": "^2.2.2",
+        "winston": "^2.3.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -2455,6 +2501,74 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/cli-cursor": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-1.0.2.tgz",
+      "integrity": "sha1-ZNo/fValRBLll5S9Ytw1KV6PKYc=",
+      "dev": true,
+      "dependencies": {
+        "restore-cursor": "^1.0.1"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/cli-table3": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/cli-table3/-/cli-table3-0.5.1.tgz",
+      "integrity": "sha512-7Qg2Jrep1S/+Q3EceiZtQcDPWxhAvBw+ERf1162v4sikJrvojMHFqXt8QIVha8UlH9rgU0BeWPytZ9/TzYqlUw==",
+      "dev": true,
+      "dependencies": {
+        "object-assign": "^4.1.0",
+        "string-width": "^2.1.1"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "optionalDependencies": {
+        "colors": "^1.1.2"
+      }
+    },
+    "node_modules/cli-table3/node_modules/ansi-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/cli-table3/node_modules/string-width": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "dev": true,
+      "dependencies": {
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/cli-table3/node_modules/strip-ansi": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+      "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/cli-width": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.1.tgz",
+      "integrity": "sha512-GRMWDxpOB6Dgk2E5Uo+3eEBvtOOlimMmpbFiKuLFnQzYDavtLFY3K5ona41jgN/WdRZtG7utuVSVTL4HbZHGkw==",
+      "dev": true
+    },
     "node_modules/cliui": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
@@ -2466,6 +2580,15 @@
         "wrap-ansi": "^5.1.0"
       }
     },
+    "node_modules/code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -2479,6 +2602,16 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/color": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/color/-/color-4.0.0.tgz",
+      "integrity": "sha512-aVUOa5aYWJSimvei14J5rdxLeljG0EB/uXTovVaaSokW+D4MsAz3MrKsRNaKqPa2KL7Wfvh7PZyIIaaX4lYdzQ==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^2.0.1",
+        "color-string": "^1.6.0"
+      }
+    },
     "node_modules/color-convert": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
@@ -2494,17 +2627,48 @@
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
       "dev": true
     },
+    "node_modules/color-string": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.6.0.tgz",
+      "integrity": "sha512-c/hGS+kRWJutUBEngKKmk4iH3sD59MBkoxVapS/0wgpCz2u7XsNloxknyvBhzwEs1IbV36D9PwqLPJ2DTu3vMA==",
+      "dev": true,
+      "dependencies": {
+        "color-name": "^1.0.0",
+        "simple-swizzle": "^0.2.2"
+      }
+    },
+    "node_modules/color/node_modules/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,
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color/node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "dev": true
+    },
     "node_modules/colorette": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/colorette/-/colorette-1.2.2.tgz",
       "integrity": "sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==",
       "dev": true
     },
-    "node_modules/colorsys": {
-      "version": "1.0.22",
-      "resolved": "https://registry.npmjs.org/colorsys/-/colorsys-1.0.22.tgz",
-      "integrity": "sha512-KCqF23oqkOD0IUCTLCl0obwGIMyeGFlNWuJ4oRRVKmawvKQeb3x5UvajVeH9AShZWU9hNaIhjXeTGw3iPNtl/Q==",
-      "dev": true
+    "node_modules/colors": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
+      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.1.90"
+      }
     },
     "node_modules/commander": {
       "version": "4.1.1",
@@ -2527,6 +2691,21 @@
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
+    "node_modules/concat-stream": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.6.2.tgz",
+      "integrity": "sha512-27HBghJxjiZtIk3Ycvn/4kbJk/1uZuJFfuPEns6LaEvpvG1f0hTea8lilrouyo9mVc2GWdcEZ8OLoGmSADlrCw==",
+      "dev": true,
+      "engines": [
+        "node >= 0.8"
+      ],
+      "dependencies": {
+        "buffer-from": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^2.2.2",
+        "typedarray": "^0.0.6"
+      }
+    },
     "node_modules/content-disposition": {
       "version": "0.5.3",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
@@ -2875,6 +3054,15 @@
       "integrity": "sha512-+ZAmfyWMT7TiIlzdqJgjMb7S4f1beorDbWbsocyK4RaiqA5RTX3K14bnBWmmA9QEM0gRdsjyyrEmcyga8Zsxmw==",
       "dev": true
     },
+    "node_modules/cycle": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/cycle/-/cycle-1.0.3.tgz",
+      "integrity": "sha1-IegLK+hYD5i0aPN5QwZisEbDStI=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/d3": {
       "version": "5.16.0",
       "resolved": "https://registry.npmjs.org/d3/-/d3-5.16.0.tgz",
@@ -3381,6 +3569,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/delegates": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
+      "dev": true
+    },
     "node_modules/depd": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
@@ -3517,6 +3711,35 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/es-check": {
+      "version": "5.2.4",
+      "resolved": "https://registry.npmjs.org/es-check/-/es-check-5.2.4.tgz",
+      "integrity": "sha512-FZ3qAJ9hwguqPvGGagaKAVDnusSkezeHbiKNM5rOepOjloeVuX2e6meMxQ+mKcnWbAFucCG7fszNrzUT8bvHcQ==",
+      "dev": true,
+      "dependencies": {
+        "acorn": "^6.4.1",
+        "caporal": "1.4.0",
+        "glob": "^7.1.2"
+      },
+      "bin": {
+        "es-check": "index.js"
+      },
+      "engines": {
+        "node": ">= 4"
+      }
+    },
+    "node_modules/es-check/node_modules/acorn": {
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.2.tgz",
+      "integrity": "sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ==",
+      "dev": true,
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/es-module-lexer": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-0.4.1.tgz",
@@ -3631,6 +3854,15 @@
         "node": ">=0.8.x"
       }
     },
+    "node_modules/exit-hook": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/exit-hook/-/exit-hook-1.1.1.tgz",
+      "integrity": "sha1-8FyiM7SMBdVP/wd2XfhQfpXAL/g=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/expand-brackets": {
       "version": "2.1.4",
       "resolved": "https://registry.npmjs.org/expand-brackets/-/expand-brackets-2.1.4.tgz",
@@ -3735,6 +3967,12 @@
         "node": ">=0.6"
       }
     },
+    "node_modules/extend": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
+      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==",
+      "dev": true
+    },
     "node_modules/extend-shallow": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
@@ -3760,6 +3998,17 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/external-editor": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-1.1.1.tgz",
+      "integrity": "sha1-Etew24UPf/fnCBuvQAVwAGDEYAs=",
+      "dev": true,
+      "dependencies": {
+        "extend": "^3.0.0",
+        "spawn-sync": "^1.0.15",
+        "tmp": "^0.0.29"
+      }
+    },
     "node_modules/extglob": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/extglob/-/extglob-2.0.4.tgz",
@@ -3841,6 +4090,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/eyes": {
+      "version": "0.1.8",
+      "resolved": "https://registry.npmjs.org/eyes/-/eyes-0.1.8.tgz",
+      "integrity": "sha1-Ys8SAjTGg3hdkCNIqADvPgzCC8A=",
+      "dev": true,
+      "engines": {
+        "node": "> 0.1.90"
+      }
+    },
     "node_modules/fast-deep-equal": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
@@ -3853,12 +4111,31 @@
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       "dev": true
     },
+    "node_modules/fast-levenshtein": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
+      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
+      "dev": true
+    },
     "node_modules/fastparse": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/fastparse/-/fastparse-1.1.2.tgz",
       "integrity": "sha512-483XLLxTVIwWK3QTrMGRqUfUpoOs/0hbQrl2oz4J0pAcm3A3bu84wxTFqGqkJzewCLdME38xJLJAxBABfQT8sQ==",
       "dev": true
     },
+    "node_modules/figures": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/figures/-/figures-1.7.0.tgz",
+      "integrity": "sha1-y+Hjr/zxzUS4DK3+0o3Hk6lwHS4=",
+      "dev": true,
+      "dependencies": {
+        "escape-string-regexp": "^1.0.5",
+        "object-assign": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/file-loader": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/file-loader/-/file-loader-5.1.0.tgz",
@@ -4084,6 +4361,19 @@
       "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
       "dev": true
     },
+    "node_modules/gauge": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/gauge/-/gauge-1.2.7.tgz",
+      "integrity": "sha1-6c7FSD09TuDvRLYKfZnkk14TbZM=",
+      "dev": true,
+      "dependencies": {
+        "ansi": "^0.3.0",
+        "has-unicode": "^2.0.0",
+        "lodash.pad": "^4.1.0",
+        "lodash.padend": "^4.1.0",
+        "lodash.padstart": "^4.1.0"
+      }
+    },
     "node_modules/gensync": {
       "version": "1.0.0-beta.2",
       "resolved": "https://registry.npmjs.org/gensync/-/gensync-1.0.0-beta.2.tgz",
@@ -4255,6 +4545,12 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/has-unicode": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
+      "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
+      "dev": true
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+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
+      }
+    },
     "interpret": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/interpret/-/interpret-1.4.0.tgz",
@@ -12273,6 +13274,12 @@
       "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
       "dev": true
     },
+    "isstream": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
+      "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo=",
+      "dev": true
+    },
     "jest-worker": {
       "version": "27.0.2",
       "resolved": "https://registry.npmjs.org/jest-worker/-/jest-worker-27.0.2.tgz",
@@ -12424,6 +13431,42 @@
       "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "dev": true
     },
+    "lodash.camelcase": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/lodash.camelcase/-/lodash.camelcase-4.3.0.tgz",
+      "integrity": "sha1-soqmKIorn8ZRA1x3EfZathkDMaY=",
+      "dev": true
+    },
+    "lodash.difference": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/lodash.difference/-/lodash.difference-4.5.0.tgz",
+      "integrity": "sha1-nMtOUF1Ia5FlE0V3KIWi3yf9AXw=",
+      "dev": true
+    },
+    "lodash.pad": {
+      "version": "4.5.1",
+      "resolved": "https://registry.npmjs.org/lodash.pad/-/lodash.pad-4.5.1.tgz",
+      "integrity": "sha1-QzCUmoM6fI2iLMIPaibE1Z3runA=",
+      "dev": true
+    },
+    "lodash.padend": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/lodash.padend/-/lodash.padend-4.6.1.tgz",
+      "integrity": "sha1-U8y6BH0G4VjTEfRdpiX05J5vFm4=",
+      "dev": true
+    },
+    "lodash.padstart": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/lodash.padstart/-/lodash.padstart-4.6.1.tgz",
+      "integrity": "sha1-0uPuv/DZ05rVD1y9G1KnvOa7YRs=",
+      "dev": true
+    },
+    "lodash.uniq": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/lodash.uniq/-/lodash.uniq-4.5.0.tgz",
+      "integrity": "sha1-0CJTc662Uq3BvILklFM5qEJ1R3M=",
+      "dev": true
+    },
     "loose-envify": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
@@ -12537,6 +13580,15 @@
         "to-regex": "^3.0.2"
       }
     },
+    "micromist": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/micromist/-/micromist-1.1.0.tgz",
+      "integrity": "sha512-+CQ76pabE9egniSEdmDuH+j2cYyIBKP97kujG8ZLZyLCRq5ExwtIy4DPHPFrq4jVbhMRBnyjuH50KU9Ohs8QCg==",
+      "dev": true,
+      "requires": {
+        "lodash.camelcase": "^4.3.0"
+      }
+    },
     "mime": {
       "version": "2.4.4",
       "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.4.tgz",
@@ -12609,6 +13661,12 @@
       "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
       "dev": true
     },
+    "mute-stream": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-0.0.6.tgz",
+      "integrity": "sha1-SJYrGeFp/R38JAs/HnMXYnu8R9s=",
+      "dev": true
+    },
     "nanoid": {
       "version": "3.1.23",
       "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.23.tgz",
@@ -12753,6 +13811,23 @@
         }
       }
     },
+    "npmlog": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-2.0.4.tgz",
+      "integrity": "sha1-mLUlMPJRTKkNCexbIsiEZyI3VpI=",
+      "dev": true,
+      "requires": {
+        "ansi": "~0.3.1",
+        "are-we-there-yet": "~1.1.2",
+        "gauge": "~1.2.5"
+      }
+    },
+    "number-is-nan": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
+      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
+      "dev": true
+    },
     "object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
@@ -12850,12 +13925,30 @@
         "wrappy": "1"
       }
     },
+    "onetime": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+      "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
+      "dev": true
+    },
     "opener": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/opener/-/opener-1.5.2.tgz",
       "integrity": "sha512-ur5UIdyw5Y7yEj9wLzhqXiy6GZ3Mwx0yGI+5sMn2r0N0v3cKJvUmFH5yPP+WXh9e0xfyzyJX95D8l088DNFj7A==",
       "dev": true
     },
+    "os-shim": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/os-shim/-/os-shim-0.1.3.tgz",
+      "integrity": "sha1-a2LDeRz3kJ6jXtRuF2WLtBfLORc=",
+      "dev": true
+    },
+    "os-tmpdir": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
+      "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
+      "dev": true
+    },
     "p-limit": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.1.tgz",
@@ -12993,6 +14086,21 @@
       "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
       "dev": true
     },
+    "pinkie": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz",
+      "integrity": "sha1-clVrgM+g1IqXToDnckjoDtT3+HA=",
+      "dev": true
+    },
+    "pinkie-promise": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.1.tgz",
+      "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
+      "dev": true,
+      "requires": {
+        "pinkie": "^2.0.0"
+      }
+    },
     "pkg-dir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-3.0.0.tgz",
@@ -13180,6 +14288,16 @@
       "integrity": "sha512-97DXOFbQJhk71ne5/Mt6cOu6yxsSfM0QGQyl0L25Gca4yGWEGJaig7l7gbCX623VqTBNGLRLaVUCnNkcedlRSQ==",
       "dev": true
     },
+    "prettyjson": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prettyjson/-/prettyjson-1.2.1.tgz",
+      "integrity": "sha1-/P+rQdGcq0365eV15kJGYZsS0ok=",
+      "dev": true,
+      "requires": {
+        "colors": "^1.1.2",
+        "minimist": "^1.2.0"
+      }
+    },
     "process": {
       "version": "0.11.10",
       "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
@@ -13490,18 +14608,40 @@
       "integrity": "sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=",
       "dev": true
     },
+    "restore-cursor": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-1.0.1.tgz",
+      "integrity": "sha1-NGYfRohjJ/7SmRR5FSJS35LapUE=",
+      "dev": true,
+      "requires": {
+        "exit-hook": "^1.0.0",
+        "onetime": "^1.0.0"
+      }
+    },
     "ret": {
       "version": "0.1.15",
       "resolved": "https://registry.npmjs.org/ret/-/ret-0.1.15.tgz",
       "integrity": "sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==",
       "dev": true
     },
+    "run-async": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
+      "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==",
+      "dev": true
+    },
     "rw": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/rw/-/rw-1.3.3.tgz",
       "integrity": "sha1-P4Yt+pGrdmsUiF700BEkv9oHT7Q=",
       "dev": true
     },
+    "rx": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/rx/-/rx-4.1.0.tgz",
+      "integrity": "sha1-pfE/957zt0D+MKqAP7CfmIBdR4I=",
+      "dev": true
+    },
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
@@ -13687,6 +14827,23 @@
       "integrity": "sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==",
       "dev": true
     },
+    "simple-swizzle": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha1-pNprY1/8zMoz9w0Xy5JZLeleVXo=",
+      "dev": true,
+      "requires": {
+        "is-arrayish": "^0.3.1"
+      },
+      "dependencies": {
+        "is-arrayish": {
+          "version": "0.3.2",
+          "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
+          "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ==",
+          "dev": true
+        }
+      }
+    },
     "slash": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-2.0.0.tgz",
@@ -13865,6 +15022,16 @@
       "integrity": "sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=",
       "dev": true
     },
+    "spawn-sync": {
+      "version": "1.0.15",
+      "resolved": "https://registry.npmjs.org/spawn-sync/-/spawn-sync-1.0.15.tgz",
+      "integrity": "sha1-sAeZVX63+wyDdsKdROih6mfldHY=",
+      "dev": true,
+      "requires": {
+        "concat-stream": "^1.4.7",
+        "os-shim": "^0.1.2"
+      }
+    },
     "spdx-correct": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
@@ -13906,6 +15073,12 @@
         "extend-shallow": "^3.0.0"
       }
     },
+    "stack-trace": {
+      "version": "0.0.10",
+      "resolved": "https://registry.npmjs.org/stack-trace/-/stack-trace-0.0.10.tgz",
+      "integrity": "sha1-VHxws0fo0ytOEI6hoqFZ5f3eGcA=",
+      "dev": true
+    },
     "static-extend": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/static-extend/-/static-extend-0.1.2.tgz",
@@ -14036,6 +15209,22 @@
         "has-flag": "^3.0.0"
       }
     },
+    "tabtab": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/tabtab/-/tabtab-2.2.2.tgz",
+      "integrity": "sha1-egR/FDsBC0y9MfhX6ClhUSy/ThQ=",
+      "dev": true,
+      "requires": {
+        "debug": "^2.2.0",
+        "inquirer": "^1.0.2",
+        "lodash.difference": "^4.5.0",
+        "lodash.uniq": "^4.5.0",
+        "minimist": "^1.2.0",
+        "mkdirp": "^0.5.1",
+        "npmlog": "^2.0.3",
+        "object-assign": "^4.1.0"
+      }
+    },
     "tapable": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/tapable/-/tapable-1.1.3.tgz",
@@ -14098,6 +15287,21 @@
         }
       }
     },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
+    "tmp": {
+      "version": "0.0.29",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.29.tgz",
+      "integrity": "sha1-8lEl/w3Z2jzLDC3Tce4SiLuRKMA=",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.1"
+      }
+    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -14313,6 +15517,12 @@
         }
       }
     },
+    "typedarray": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
+      "dev": true
+    },
     "typescript": {
       "version": "3.9.7",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
@@ -14721,6 +15931,34 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "winston": {
+      "version": "2.4.5",
+      "resolved": "https://registry.npmjs.org/winston/-/winston-2.4.5.tgz",
+      "integrity": "sha512-TWoamHt5yYvsMarGlGEQE59SbJHqGsZV8/lwC+iCcGeAe0vUaOh+Lv6SYM17ouzC/a/LB1/hz/7sxFBtlu1l4A==",
+      "dev": true,
+      "requires": {
+        "async": "~1.0.0",
+        "colors": "1.0.x",
+        "cycle": "1.0.x",
+        "eyes": "0.1.x",
+        "isstream": "0.1.x",
+        "stack-trace": "0.0.x"
+      },
+      "dependencies": {
+        "async": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz",
+          "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=",
+          "dev": true
+        },
+        "colors": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
+          "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=",
+          "dev": true
+        }
+      }
+    },
     "worker-loader": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/worker-loader/-/worker-loader-2.0.0.tgz",
diff --git a/package.json b/package.json
index 1ba23c8d..e934684b 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "@types/source-map": "^0.5.7",
     "@types/underscore": "^1.10.24",
     "bootstrap": "^4.6.0",
-    "colorsys": "^1.0.22",
+    "color": "^4.0.0",
     "css-loader": "^5.2.6",
     "d3": "^5.16.0",
     "datatables.net-bs4": "^1.10.23",
@@ -30,6 +30,7 @@
     "datatables.net-colreorder-bs4": "^1.5.3",
     "datatables.net-fixedheader-bs4": "^3.1.7",
     "datatables.net-responsive-bs4": "^2.2.7",
+    "es-check": "^5.2.4",
     "file-loader": "^5.1.0",
     "hoist-non-react-statics": "^3.3.2",
     "imports-loader": "^3.0.0",
diff --git a/src/infertypes.ts b/src/infertypes.ts
index 4a27f716..1e46eda4 100644
--- a/src/infertypes.ts
+++ b/src/infertypes.ts
@@ -7,7 +7,7 @@
 
 import * as d3 from "d3";
 
-import colorsys from "colorsys";
+import * as color from "color";
 
 import { PersistentState } from "./lib/savedstate";
 import { categoricalColorScheme } from "./lib/categoricalcolors";
@@ -152,8 +152,7 @@ function compute_val2color(pd: ParamDef) {
         }
         if (pd.distinct_values.length <= 20) {
             const scheme = ["#1f77b4", "#ff7f0e", "#d62728", "#9467bd", "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf", "#1f77b4", "#aec7e8", "#ffbb78", "#ff9896", "#c5b0d5", "#c49c94", "#f7b6d2", "#c7c7c7", "#dbdb8d", "#9edae5", "#2ca02c"];
-            const c = colorsys.parseCss(scheme[i]);
-            pd.__val2color[pd.distinct_values[i]] = 'rgb(' + c.r + ', ' + c.g + ',' + c.b + ')';
+            pd.__val2color[pd.distinct_values[i]] = color(scheme[i]).rgb().string();
             continue;
         }
         pd.__val2color[pd.distinct_values[i]] = categoricalColorScheme(pd.distinct_values[i]);
@@ -230,7 +229,7 @@ export function colorScheme(pd: ParamDef, value: any, alpha: number, defaultColo
         const interpColFn = getColorMap(pd, defaultColorMap);
         try {
             const code = interpColFn(colr);
-            const rgb = colorsys.parseCss(code);
+            const rgb = color(code).rgb().object();
             return `rgba(${rgb.r}, ${rgb.g}, ${rgb.b}, ${alpha})`;
         } catch (err) {
             throw new Error(`Error below happened while computing color using color map "${pd.colormap}" for column ${pd.name}: is the colormap valid? (${err.toString()})`);
diff --git a/src/lib/categoricalcolors.ts b/src/lib/categoricalcolors.ts
index 6a855fa4..6f032992 100644
--- a/src/lib/categoricalcolors.ts
+++ b/src/lib/categoricalcolors.ts
@@ -8,7 +8,7 @@
 import * as d3 from "d3";
 
 import seedrandom from "seedrandom";
-import colorsys from "colorsys";
+import * as color from "color";
 
 
 function hashCode(str: string): number {
@@ -27,18 +27,12 @@ export function categoricalColorScheme(value: string): string {
     const h = hashCode(json);
     const uniform01 = seedrandom(json)();
     // @ts-ignore
-    const c_turbo = colorsys.parseCss(d3.interpolateTurbo(uniform01));
-    const c_hsv = colorsys.rgb_to_hsv(c_turbo);
+    const c = color(d3.interpolateTurbo(uniform01)).hsv().object();
     if ((h % 3) == 1) {
-        c_hsv.v -= 20;
+        c.v -= 20;
     }
     if ((h % 3) == 2) {
-        c_hsv.s -= 20;
+        c.s -= 20;
     }
-    const c = colorsys.hsv_to_rgb({
-        h: c_hsv.h,
-        s: c_hsv.s,
-        v: c_hsv.v
-    });
-    return 'rgb(' + c.r + ', ' + c.g + ',' + c.b + ')';
+    return color(c).rgb().string();
 }
diff --git a/src/lib/jqueryext.ts b/src/lib/jqueryext.ts
deleted file mode 100644
index 28413a91..00000000
--- a/src/lib/jqueryext.ts
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-// From https://stackoverflow.com/questions/18743144/jquery-event-listen-on-position-changed
-import $ from "jquery";
-
-export function on_position_changed(obj, trigger, millis?): NodeJS.Timeout {
-    if (millis == null) millis = 100;
-    var o = $(obj[0]); // our jquery object
-    if (o.length < 1) return null;
-    var lastPos = o.position();
-    var lastOff = o.offset();
-    var lastWidth = o.width();
-    var lastOffWidth = o[0].offsetWidth;
-    return setInterval(function () {
-        if (o == null || o.length < 1) return o; // abort if element is non existend any more
-        var newPos = o.position();
-        var newOff = o.offset();
-        var newWidth = o.width();
-        var newOffWidth = o[0].offsetWidth;
-        if (lastPos.top != newPos.top || lastPos.left != newPos.left) {
-            o.trigger('onPositionChanged', { lastPos: lastPos, newPos: newPos });
-            if (typeof (trigger) == "function") trigger(lastPos, newPos);
-            lastPos = o.position();
-        }
-        if (lastOff.top != newOff.top || lastOff.left != newOff.left) {
-            o.trigger('onPositionChanged', { lastOff: lastOff, newOff: newOff});
-            if (typeof (trigger) == "function") trigger(lastOff, newOff);
-            lastOff= o.offset();
-        }
-        if (lastWidth != newWidth) {
-            o.trigger('onPositionChanged', { lastWidth: lastWidth, newWidth: newWidth});
-            if (typeof (trigger) == "function") trigger(lastWidth, newWidth);
-            lastWidth= o.width();
-        }
-        if (lastOffWidth != newOffWidth) {
-            o.trigger('onPositionChanged', { lastOffWidth: lastOffWidth, newOffWidth: newOffWidth});
-            if (typeof (trigger) == "function") trigger(lastOffWidth, newOffWidth);
-            lastWidth= o.width();
-        }
-    }, millis);
-};
diff --git a/tsconfig.json b/tsconfig.json
index a5a82100..b8ce13a7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -23,14 +23,14 @@
     // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
 
     /* Strict Type-Checking Options */
-    "strict": false,                           /* Enable all strict type-checking options. */
+    "strict": false,                          /* Enable all strict type-checking options. */
     // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
     // "strictNullChecks": true,              /* Enable strict null checks. */
     // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
     // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
     // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
     // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
-    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+    "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
 
     /* Additional Checks */
     // "noUnusedLocals": true,                /* Report errors on unused locals. */
@@ -64,6 +64,6 @@
     "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
   },
   "include": [
-        "./src/**/*"
-    ]
+        "./src/**/*",
+  ]
 }
diff --git a/webpack.config.js b/webpack.config.js
index 3099a7ed..b2ede247 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -126,9 +126,19 @@ LICENSE file in the root directory of this source tree."),
               loader: 'worker-loader',
               options: { inline: true, fallback: false }
           },
+          {
+              // Let's pass the color* modules through the TS Loader to transpile to ES3
+              test: /\.js$/,
+              loader: 'ts-loader',
+              include: /node_modules\/color/,
+              options: {
+                transpileOnly: true,
+              }
+          },
           {
               test: /\.(ts|tsx)$/,
               loader: 'ts-loader',
+              exclude: /node_modules/,
               options: {
                 compilerOptions: {
                   declaration: false,
@@ -150,6 +160,25 @@ LICENSE file in the root directory of this source tree."),
     devtool: 'source-map',
 }};
 
+
+// Make sure we generate ES3 code
+const webpackOutputEnvironment = {
+  // The environment supports arrow functions ('() => { ... }').
+  arrowFunction: false,
+  // The environment supports BigInt as literal (123n).
+  bigIntLiteral: false,
+  // The environment supports const and let for variable declarations.
+  const: false,
+  // The environment supports destructuring ('{ a, b } = obj').
+  destructuring: false,
+  // The environment supports an async import() function to import EcmaScript modules.
+  dynamicImport: false,
+  // The environment supports 'for of' iteration ('for (const x of array) { ... }').
+  forOf: false,
+  // The environment supports ECMAScript Module syntax to import ECMAScript modules (import ... from '...').
+  module: false,
+};
+
 module.exports = [
 // Web config - for hiplot webserver, notebook and streamlit
 env => {
@@ -174,7 +203,8 @@ env => {
         path: distPath,
         filename: '[name].bundle.js',
         library: 'hiplot',
-        libraryTarget: 'var'
+        libraryTarget: 'var',
+        environment: webpackOutputEnvironment,
     },
     ...exportConfig(env, {
       web: true,
@@ -190,7 +220,8 @@ env => { return {
         path: distPath,
         filename: '[name].lib.js',
         library: 'hiplot',
-        libraryTarget: 'umd'
+        libraryTarget: 'umd',
+        environment: webpackOutputEnvironment,
     },
     externals: {
       react: {