add eslint and prettier

.prettierrc.js

@@ -4,5 +4,4 @@ module.exports = {
     singleQuote: false,
     printWidth: 120,
     tabWidth: 4,
-    editorconfig: true
 };

package-lock.json

@@ -125,6 +125,12 @@
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     "@types/sizzle": {
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@@ -368,6 +374,24 @@
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       "dev": true
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+    "aggregate-error": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
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+      "dev": true,
+      "requires": {
+        "clean-stack": "^2.0.0",
+        "indent-string": "^4.0.0"
+      },
+      "dependencies": {
+        "indent-string": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/indent-string/-/indent-string-4.0.0.tgz",
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+          "dev": true
+        }
+      }
+    },
     "ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
@@ -426,6 +450,23 @@
         "ansi-wrap": "0.1.0"
       }
     },
+    "ansi-escapes": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
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+      "dev": true,
+      "requires": {
+        "type-fest": "^0.11.0"
+      },
+      "dependencies": {
+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
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+          "dev": true
+        }
+      }
+    },
     "ansi-gray": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/ansi-gray/-/ansi-gray-0.1.1.tgz",
@@ -1131,6 +1172,12 @@
         "upath": "^1.1.1"
       }
     },
+    "ci-info": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
+      "integrity": "sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==",
+      "dev": true
+    },
     "class-utils": {
       "version": "0.3.6",
       "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
@@ -1154,6 +1201,106 @@
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       }
     },
+    "clean-stack": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
+      "integrity": "sha512-4diC9HaTE+KRAMWhDhrGOECgWZxoevMc5TlkObMqNSsVU62PYzXZ/SMTjzyGAFF1YusgxGcSWTEXBhp0CPwQ1A==",
+      "dev": true
+    },
+    "cli-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^3.1.0"
+      }
+    },
+    "cli-truncate": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-truncate/-/cli-truncate-2.1.0.tgz",
+      "integrity": "sha512-n8fOixwDD6b/ObinzTrp1ZKFzbgvKZvuz/TvejnLn1aQfC6r52XEx85FmuC+3HI+JM7coBRXUvNqEU2PHVrHpg==",
+      "dev": true,
+      "requires": {
+        "slice-ansi": "^3.0.0",
+        "string-width": "^4.2.0"
+      },
+      "dependencies": {
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+          "requires": {
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+            "astral-regex": "^2.0.0",
+            "is-fullwidth-code-point": "^3.0.0"
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+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "dev": true,
+          "requires": {
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+    },
     "cliui": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
@@ -1251,6 +1398,18 @@
         "delayed-stream": "~1.0.0"
       }
     },
+    "commander": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-6.2.1.tgz",
+      "integrity": "sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==",
+      "dev": true
+    },
+    "compare-versions": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/compare-versions/-/compare-versions-3.6.0.tgz",
+      "integrity": "sha512-W6Af2Iw1z4CB7q4uU4hv646dW9GQuBM+YpC0UvUCWSD8w90SJjp+ujJuXaEMtAXBtSqGfMPuFOVn4/+FlaqfBA==",
+      "dev": true
+    },
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       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
@@ -1346,6 +1505,39 @@
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       "dev": true
     },
+    "cosmiconfig": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
+      "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
+      "dev": true,
+      "requires": {
+        "@types/parse-json": "^4.0.0",
+        "import-fresh": "^3.2.1",
+        "parse-json": "^5.0.0",
+        "path-type": "^4.0.0",
+        "yaml": "^1.10.0"
+      },
+      "dependencies": {
+        "parse-json": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.1.0.tgz",
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+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.0.0",
+            "error-ex": "^1.3.1",
+            "json-parse-even-better-errors": "^2.3.0",
+            "lines-and-columns": "^1.1.6"
+          }
+        },
+        "path-type": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
+          "integrity": "sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==",
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+        }
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     "crc-32": {
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@@ -1438,6 +1630,12 @@
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       "dev": true
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+    "dedent": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/dedent/-/dedent-0.7.0.tgz",
+      "integrity": "sha1-JJXduvbrh0q7Dhvp3yLS5aVEMmw=",
+      "dev": true
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@@ -1986,6 +2184,45 @@
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       "dev": true
     },
+    "execa": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/execa/-/execa-4.1.0.tgz",
+      "integrity": "sha512-j5W0//W7f8UxAn8hXVnwG8tLwdiUy4FJLcSupCg6maBYZDpyBvTApK7KyuI4bKj8KOh1r2YH+6ucuYtJv1bTZA==",
+      "dev": true,
+      "requires": {
+        "cross-spawn": "^7.0.0",
+        "get-stream": "^5.0.0",
+        "human-signals": "^1.1.1",
+        "is-stream": "^2.0.0",
+        "merge-stream": "^2.0.0",
+        "npm-run-path": "^4.0.0",
+        "onetime": "^5.1.0",
+        "signal-exit": "^3.0.2",
+        "strip-final-newline": "^2.0.0"
+      },
+      "dependencies": {
+        "cross-spawn": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
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+          "dev": true,
+          "requires": {
+            "path-key": "^3.1.0",
+            "shebang-command": "^2.0.0",
+            "which": "^2.0.1"
+          }
+        },
+        "which": {
+          "version": "2.0.2",
+          "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+          "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+          "dev": true,
+          "requires": {
+            "isexe": "^2.0.0"
+          }
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+    },
     "exit-on-epipe": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/exit-on-epipe/-/exit-on-epipe-1.0.1.tgz",
@@ -2264,6 +2501,15 @@
         "reusify": "^1.0.4"
       }
     },
+    "figures": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/figures/-/figures-3.2.0.tgz",
+      "integrity": "sha512-yaduQFRKLXYOGgEn6AZau90j3ggSOyiqXU0F9JZfeXYhNa+Jk4X+s45A2zg5jns87GAFa34BBm2kXw4XpNcbdg==",
+      "dev": true,
+      "requires": {
+        "escape-string-regexp": "^1.0.5"
+      }
+    },
     "file-entry-cache": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-6.0.0.tgz",
@@ -2313,6 +2559,15 @@
         "pinkie-promise": "^2.0.0"
       }
     },
+    "find-versions": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/find-versions/-/find-versions-3.2.0.tgz",
+      "integrity": "sha512-P8WRou2S+oe222TOCHitLy8zj+SIsVJh52VP4lvXkaFVnOFFdoWv1H1Jjvel1aI6NCFOAaeAVm8qrI0odiLcww==",
+      "dev": true,
+      "requires": {
+        "semver-regex": "^2.0.0"
+      }
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     "findup-sync": {
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@@ -2541,12 +2796,39 @@
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       "dev": true
     },
+    "get-own-enumerable-property-symbols": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/get-own-enumerable-property-symbols/-/get-own-enumerable-property-symbols-3.0.2.tgz",
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+    },
     "get-stdin": {
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       "integrity": "sha1-uWjGsKBDhDJJAui/Gl3zJXmkUP4=",
       "dev": true
     },
+    "get-stream": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-5.2.0.tgz",
+      "integrity": "sha512-nBF+F1rAZVCu/p7rjzgA+Yb4lfYXrpl7a6VmJrU8wF9I1CKvP/QwPNZHnOlwbTkY6dvtFIzFMSyQXbLoTQPRpA==",
+      "dev": true,
+      "requires": {
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+          "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
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+          "dev": true,
+          "requires": {
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+            "once": "^1.3.1"
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@@ -3065,6 +3347,30 @@
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+    "human-signals": {
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+      "resolved": "https://registry.npmjs.org/human-signals/-/human-signals-1.1.1.tgz",
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+      "dev": true
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+    "husky": {
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.6.tgz",
+      "integrity": "sha512-o6UjVI8xtlWRL5395iWq9LKDyp/9TE7XMOTvIpEVzW638UcGxTmV5cfel6fsk/jbZSTlvfGVJf2svFtybcIZag==",
+      "dev": true,
+      "requires": {
+        "chalk": "^4.0.0",
+        "ci-info": "^2.0.0",
+        "compare-versions": "^3.6.0",
+        "cosmiconfig": "^7.0.0",
+        "find-versions": "^3.2.0",
+        "opencollective-postinstall": "^2.0.2",
+        "pkg-dir": "^4.2.0",
+        "please-upgrade-node": "^3.2.0",
+        "slash": "^3.0.0",
+        "which-pm-runs": "^1.0.0"
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@@ -3325,6 +3631,12 @@
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+    "is-obj": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-obj/-/is-obj-1.0.1.tgz",
+      "integrity": "sha1-PkcprB9f3gJc19g6iW2rn09n2w8=",
+      "dev": true
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@@ -3343,6 +3655,12 @@
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     },
+    "is-regexp": {
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+      "dev": true,
+      "requires": {
+        "tslib": "^1.9.0"
+      }
+    },
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
@@ -5090,6 +5747,12 @@
       "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
       "dev": true
     },
+    "semver-compare": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/semver-compare/-/semver-compare-1.0.0.tgz",
+      "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w=",
+      "dev": true
+    },
     "semver-greatest-satisfied-range": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/semver-greatest-satisfied-range/-/semver-greatest-satisfied-range-1.1.0.tgz",
@@ -5099,6 +5762,12 @@
         "sver-compat": "^1.5.0"
       }
     },
+    "semver-regex": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/semver-regex/-/semver-regex-2.0.0.tgz",
+      "integrity": "sha512-mUdIBBvdn0PLOeP3TEkMH7HHeUP3GjsXCwKarjv/kGmUFOYg1VqEemKhoQpWMu6X2I8kHeuVdGibLGkVK+/5Qw==",
+      "dev": true
+    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -5448,6 +6117,12 @@
       "integrity": "sha512-AiisoFqQ0vbGcZgQPY1cdP2I76glaVA/RauYR4G4thNFgkTqr90yXTo4LYX60Jl+sIlPNHHdGSwo01AvbKUSVQ==",
       "dev": true
     },
+    "string-argv": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/string-argv/-/string-argv-0.3.1.tgz",
+      "integrity": "sha512-a1uQGz7IyVy9YwhqjZIZu1c8JO8dNIe20xBmSS6qu9kv++k3JGzCVmprbNN5Kn+BgzD5E7YYwg1CcjuJMRNsvg==",
+      "dev": true
+    },
     "string-width": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
@@ -5530,6 +6205,17 @@
         "safe-buffer": "~5.1.0"
       }
     },
+    "stringify-object": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/stringify-object/-/stringify-object-3.3.0.tgz",
+      "integrity": "sha512-rHqiFh1elqCQ9WPLIC8I0Q/g/wj5J1eMkyoiD6eoQApWHP0FtlK7rqnhmabL5VUY9JQCcqwwvlOaSuutekgyrw==",
+      "dev": true,
+      "requires": {
+        "get-own-enumerable-property-symbols": "^3.0.0",
+        "is-obj": "^1.0.1",
+        "is-regexp": "^1.0.0"
+      }
+    },
     "strip-ansi": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
@@ -5567,6 +6253,12 @@
         "strip-bom-buf": "^1.0.0"
       }
     },
+    "strip-final-newline": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz",
+      "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
+      "dev": true
+    },
     "strip-indent": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
@@ -5704,6 +6396,12 @@
       "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
       "dev": true
     },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
     "through2": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
@@ -6202,6 +6900,12 @@
       "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
       "dev": true
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
+      "dev": true
+    },
     "wide-align": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
@@ -6263,6 +6967,12 @@
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
     },
+    "yaml": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
+      "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg==",
+      "dev": true
+    },
     "yargs": {
       "version": "16.2.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",

package.json

@@ -9,7 +9,10 @@
         "build:watch": "gulp watch",
         "clean": "gulp clean && gulp link --clean",
         "update": "npm install --save-dev gitlab:foundry-projects/foundry-pc/foundry-pc-types",
-        "lint": "eslint '*/**/*.{js,ts,tsx}' --quiet --fix"
+        "lint": "eslint 'src/**/*.ts'",
+        "lint:fix": "eslint 'src/**/*.ts' --fix",
+        "format:check": "prettier --list-different \"src/**/*.ts\"",
+        "format": "prettier --write \"src/**/*.ts\""
     },
     "author": "",
     "license": "",
@@ -28,10 +31,20 @@
         "gulp-less": "^4.0.1",
         "gulp-sass": "^4.1.0",
         "gulp-typescript": "^6.0.0-alpha.1",
+        "husky": "^4.3.6",
         "json-stringify-pretty-compact": "^2.0.0",
+        "lint-staged": "^10.5.3",
         "prettier": "^2.2.1",
         "sass": "^1.30.0",
         "typescript": "^4.1.3",
         "yargs": "^16.2.0"
+    },
+    "husky": {
+        "hooks": {
+            "pre-commit": "lint-staged"
+        }
+    },
+    "lint-staged": {
+        "*.ts": "eslint --cache --fix"
     }
 }

src/module/actor/actor-data.ts

@@ -0,0 +1,2 @@
+// TODO: Actually add a type for data
+export type DS4ActorDataType = unknown;

src/module/actor/actor-sheet.ts

@@ -1,12 +1,13 @@
+import { DS4Actor } from "./actor";
+import { DS4ActorDataType } from "./actor-data";
+
 /**
  * Extend the basic ActorSheet with some very simple modifications
  * @extends {ActorSheet}
  */
-export class DS4ActorSheet extends ActorSheet<{
+export class DS4ActorSheet extends ActorSheet<DS4ActorDataType, DS4Actor> {
-    /* TODO: add actual type for data */
-}> {
     /** @override */
-    static get defaultOptions() {
+    static get defaultOptions(): FormApplicationOptions {
         return mergeObject(super.defaultOptions, {
             classes: ["ds4", "sheet", "actor"],
             template: "systems/ds4/templates/actor/actor-sheet.html",
@@ -19,11 +20,11 @@ export class DS4ActorSheet extends ActorSheet<{
     /* -------------------------------------------- */
 
     /** @override */
-    getData() {
+    getData(): ActorSheetData<DS4ActorDataType> {
         // TODO: replace ["..."] access with .
         const data = super.getData();
         data["dtypes"] = ["String", "Number", "Boolean"];
-        for (let attr of Object.values(data.data["attributes"])) {
+        for (const attr of Object.values(data.data["attributes"])) {
             attr["isCheckbox"] = attr["dtype"] === "Boolean";
         }
         console.log(data);
@@ -31,7 +32,7 @@ export class DS4ActorSheet extends ActorSheet<{
     }
 
     /** @override */
-    activateListeners(html) {
+    activateListeners(html: JQuery): void {
         super.activateListeners(html);
 
         // Everything below here is only needed if the sheet is editable
@@ -65,7 +66,7 @@ export class DS4ActorSheet extends ActorSheet<{
      * @param {Event} event   The originating click event
      * @private
      */
-    _onItemCreate(event) {
+    _onItemCreate(event: JQuery.ClickEvent): Promise<Item> {
         event.preventDefault();
         const header = event.currentTarget;
         // Get the type of item to create.
@@ -92,14 +93,14 @@ export class DS4ActorSheet extends ActorSheet<{
      * @param {Event} event   The originating click event
      * @private
      */
-    _onRoll(event) {
+    _onRoll(event: JQuery.ClickEvent): void {
         event.preventDefault();
         const element = event.currentTarget;
         const dataset = element.dataset;
 
         if (dataset.roll) {
-            let roll = new Roll(dataset.roll, this.actor.data.data);
+            const roll = new Roll(dataset.roll, this.actor.data.data as Record<string, unknown>);
-            let label = dataset.label ? `Rolling ${dataset.label}` : "";
+            const label = dataset.label ? `Rolling ${dataset.label}` : "";
             roll.roll().toMessage({
                 speaker: ChatMessage.getSpeaker({ actor: this.actor }),
                 flavor: label,

src/module/actor/actor.ts

@@ -1,34 +1,39 @@
+import { DS4ActorDataType } from "./actor-data";
+
 /**
  * Extend the base Actor entity by defining a custom roll data structure which is ideal for the Simple system.
  * @extends {Actor}
  */
-export class DS4Actor extends Actor {
+export class DS4Actor extends Actor<DS4ActorDataType> {
     /** @override */
-    prepareDerivedData() {
+    prepareDerivedData(): void {
         const data = this.data;
         this._prepareCombatValues(data);
     }
 
-    _prepareCombatValues(data) {
+    _prepareCombatValues(data: ActorData<DS4ActorDataType>): void {
         const hitPointsModifier = getProperty(data, "data.combatValues.hitPoints.modifier") || 0;
         setProperty(
             data,
             "data.combatValues.hitPoints.max",
-            data.data.attributes.body.initial + data.data.traits.constitution.initial + 10 + hitPointsModifier
+            data.data["attributes"]["body"].initial + // TODO: replace ["..."]
+                data.data["traits"]["constitution"].initial + // TODO: replace ["..."]
+                10 +
+                hitPointsModifier,
         );
 
         const defenseModifier = getProperty(data, "data.combatValues.defense.modifier") || 0;
         setProperty(
             data,
             "data.combatValues.defense.value",
-            data.data.attributes.body.initial +
+            data.data["attributes"]["body"].initial + // TODO: replace ["..."]
-                data.data.traits.constitution.initial +
+                data.data["traits"]["constitution"].initial + // TODO: replace ["..."]
                 this._getArmorValue() +
-                defenseModifier
+                defenseModifier,
         );
     }
 
-    _getArmorValue() {
+    _getArmorValue(): number {
         return this.data["items"]
             .filter((item) => ["armor", "shield"].includes(item.type))
             .filter((item) => item.data.equipped)

src/module/ds4.ts

@@ -18,8 +18,8 @@ Hooks.once("init", async function () {
     CONFIG.DS4 = DS4;
 
     // Define custom Entity classes
-    CONFIG.Actor.entityClass = DS4Actor;
+    CONFIG.Actor.entityClass = DS4Actor as typeof Actor; // TODO: Can we remove the casts?
-    CONFIG.Item.entityClass = DS4Item;
+    CONFIG.Item.entityClass = DS4Item as typeof Item; // TODO: Can we remove the casts?
 
     // Register sheet application classes
     Actors.unregisterSheet("core", ActorSheet);
@@ -50,7 +50,7 @@ Hooks.once("setup", function () {
     const noSort = [];
 
     // Localize and sort CONFIG objects
-    for (let o of toLocalize) {
+    for (const o of toLocalize) {
         const localized = Object.entries(CONFIG.DS4[o]).map((e) => {
             return [e[0], game.i18n.localize(e[1] as string)];
         });

src/module/item/item-data.ts

@@ -0,0 +1,2 @@
+// TODO: Actually add a type for data
+export type DS4ItemDataType = unknown;

src/module/item/item-sheet.ts

@@ -1,10 +1,14 @@
+import { DS4ActorDataType } from "../actor/actor-data";
+import { DS4Item } from "./item";
+import { DS4ItemDataType } from "./item-data";
+
 /**
  * Extend the basic ItemSheet with some very simple modifications
  * @extends {ItemSheet}
  */
-export class DS4ItemSheet extends ItemSheet {
+export class DS4ItemSheet extends ItemSheet<DS4ActorDataType, DS4Item> {
     /** @override */
-    static get defaultOptions() {
+    static get defaultOptions(): FormApplicationOptions {
         return mergeObject(super.defaultOptions, {
             width: 530,
             height: 400,
@@ -14,7 +18,7 @@ export class DS4ItemSheet extends ItemSheet {
     }
 
     /** @override */
-    get template() {
+    get template(): string {
         const path = "systems/ds4/templates/item";
         return `${path}/${this.item.data.type}-sheet.hbs`;
     }
@@ -22,7 +26,7 @@ export class DS4ItemSheet extends ItemSheet {
     /* -------------------------------------------- */
 
     /** @override */
-    getData() {
+    getData(): ItemSheetData<DS4ItemDataType> {
         const data = { ...super.getData(), config: CONFIG.DS4 };
         console.log(data);
         return data;
@@ -31,7 +35,7 @@ export class DS4ItemSheet extends ItemSheet {
     /* -------------------------------------------- */
 
     /** @override */
-    setPosition(options = {}) {
+    setPosition(options = {}): unknown {
         const position = super.setPosition(options);
         const sheetBody = (this.element as JQuery).find(".sheet-body"); // TODO: Why is the cast necessary?
         const bodyHeight = position.height - 192;
@@ -42,7 +46,7 @@ export class DS4ItemSheet extends ItemSheet {
     /* -------------------------------------------- */
 
     /** @override */
-    activateListeners(html) {
+    activateListeners(html: JQuery): void {
         super.activateListeners(html);
 
         if (!this.options.editable) return;
@@ -52,7 +56,7 @@ export class DS4ItemSheet extends ItemSheet {
         html.find(".effect-edit").click((ev) => {
             const li = $(ev.currentTarget).parents(".effect");
             console.log(li.data("effectId"));
-            const effect = this.item.effects.get(li.data("effectId"));
+            const effect = this.item["effects"].get(li.data("effectId")); // TODO: replace ["..."]
             effect.sheet.render(true);
         });
 
@@ -67,7 +71,7 @@ export class DS4ItemSheet extends ItemSheet {
      * @param {Event} event   The originating click event
      * @private
      */
-    async _onEffectCreate(event) {
+    async _onEffectCreate(event: JQuery.ClickEvent): Promise<unknown> {
         event.preventDefault();
 
         const label = `New Effect`;

src/module/item/item.ts

@@ -1,17 +1,19 @@
+import { DS4ItemDataType } from "./item-data";
+
 /**
  * Extend the basic Item with some very simple modifications.
  * @extends {Item}
  */
-export class DS4Item extends Item {
+export class DS4Item extends Item<DS4ItemDataType> {
     /**
      * Augment the basic Item data model with additional dynamic data.
      */
-    prepareData() {
+    prepareData(): void {
         super.prepareData();
 
         // Get the Item's data
-        const itemData = this.data;
+        // const itemData = this.data;
-        const actorData = this.actor ? this.actor.data : {};
+        // const actorData = this.actor ? this.actor.data : {};
-        const data = itemData.data;
+        // const data = itemData.data;
     }
 }