Setup recommended eslint preset (#1345)

This is usually enough to prevent silly mistakes.
Formatting will be done by prettier after merging pull requests.

.editorconfig

@@ -1,19 +0,0 @@
-; editorconfig.org
-root = true
-
-[*]
-indent_style = space
-indent_size = 4
-end_of_line = lf
-charset = utf-8
-trim_trailing_whitespace = true
-insert_final_newline = true
-
-[Makefile]
-indent_style = tab
-
-[package.json]
-indent_size = 2
-
-[*.yml]
-indent_size = 2

.github/workflows/main.yml

@@ -26,3 +26,4 @@ jobs:
       - run: npm ci
       - run: npm test
       - run: npm run test-browser
+      - run: npm run lint

.jshintignore

@@ -1,3 +0,0 @@
-node_modules/
-lib-cov/
-html-report/

.jshintrc

@@ -1,30 +0,0 @@
-{
-    "globals": {
-        "phantom": false,
-        "after": false,
-        "describe": false,
-        "before": false,
-        "it": false,
-        "beforeEach": false
-    },
-    "node": true,
-    "strict": "global",
-    "expr": true,
-    "curly": false,
-    "camelcase": true,
-    "eqeqeq": false,
-    "-W041": false,
-    "-W008": false,
-    "forin": false,
-    "immed": true,
-    "multistr": true,
-    "newcap": true,
-    "nonew": true,
-    "quotmark": "single",
-    "undef": true,
-    "unused": true,
-    "loopfunc": true,
-    "trailing": true,
-    "lastsemic": true,
-    "esversion": 6
-}

examples/test.js

@@ -49,7 +49,7 @@ FS.readFile(filepath, 'utf8', function(err, data) {
         throw err;
     }
 
-    const result = svgo.optimize(data, {path: filepath, ...config});
+    const result = optimize(data, {path: filepath, ...config});
 
     console.log(result);
 

lib/svgo-node.js

@@ -39,6 +39,7 @@ const loadConfig = async (configFile, cwd = process.cwd()) => {
     }
   }
   let dir = cwd;
+  // eslint-disable-next-line no-constant-condition
   while (true) {
     const file = path.join(dir, "svgo.config.js");
     if (await isFile(file)) {

lib/svgo/coa.js

@@ -1,4 +1,3 @@
-/* jshint quotmark: false */
 'use strict';
 
 const FS = require('fs');
@@ -46,7 +45,7 @@ module.exports = function makeProgram(program) {
         .action(action);
 }
 
-async function action(args, opts) {
+async function action(args, opts, command) {
     var input = opts.input || args;
     var output = opts.output;
     var config = {}
@@ -91,7 +90,9 @@ async function action(args, opts) {
         !opts.stdin &&
         !opts.folder &&
         process.stdin.isTTY === true
-    ) return program.help();
+    ) {
+      return command.help();
+    }
 
     if (typeof process == 'object' && process.versions && process.versions.node && PKG && PKG.engines.node) {
         var nodeVersion = String(PKG.engines.node).match(/\d*(\.\d+)*/)[0];

lib/svgo/jsAPI.js

@@ -225,7 +225,6 @@ JSAPI.prototype.renameElem = function(name) {
  * @return {Object|Undefined}
  */
  JSAPI.prototype.computedAttr = function(name, val) {
-    /* jshint eqnull: true */
     if (!arguments.length) return;
 
     for (var elem = this; elem && (!elem.hasAttr(name) || !elem.attr(name).value); elem = elem.parentNode);

lib/svgo/svg2js.js

@@ -4,7 +4,7 @@ var SAX = require('sax'),
     JSAPI = require('./jsAPI.js'),
     CSSClassList = require('./css-class-list'),
     CSSStyleDeclaration = require('./css-style-declaration'),
-    entityDeclaration = /<!ENTITY\s+(\S+)\s+(?:'([^\']+)'|"([^\"]+)")\s*>/g;
+    entityDeclaration = /<!ENTITY\s+(\S+)\s+(?:'([^']+)'|"([^"]+)")\s*>/g;
 
 var config = {
     strict: true,

package-lock.json

@@ -318,6 +318,41 @@
         }
       }
     },
+    "@eslint/eslintrc": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.3.0.tgz",
+      "integrity": "sha512-1JTKgrOKAHVivSvOYw+sJOunkBjUOvjqWk1DPja7ZFhIS2mX/4EgTT8M7eTK9jrKhL/FvXXEbQwIs3pg1xp3dg==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "lodash": "^4.17.20",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
+        }
+      }
+    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -493,6 +528,18 @@
       "integrity": "sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==",
       "dev": true
     },
+    "acorn": {
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
+      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
+      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
+      "dev": true
+    },
     "agent-base": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
@@ -529,6 +576,18 @@
         "indent-string": "^4.0.0"
       }
     },
+    "ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
     "ansi-colors": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
@@ -596,6 +655,12 @@
       "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
       "dev": true
     },
+    "astral-regex": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",
+      "integrity": "sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==",
+      "dev": true
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -662,6 +727,12 @@
         "write-file-atomic": "^3.0.0"
       }
     },
+    "callsites": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
+      "dev": true
+    },
     "camelcase": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@@ -942,6 +1013,12 @@
         "type-detect": "^4.0.0"
       }
     },
+    "deep-is": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
+      "dev": true
+    },
     "deepmerge": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/deepmerge/-/deepmerge-4.2.2.tgz",
@@ -1005,6 +1082,15 @@
         "path-type": "^4.0.0"
       }
     },
+    "doctrine": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "dom-serializer": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.2.0.tgz",
@@ -1053,6 +1139,15 @@
         "once": "^1.4.0"
       }
     },
+    "enquirer": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/enquirer/-/enquirer-2.3.6.tgz",
+      "integrity": "sha512-yjNnPr315/FjS4zIsUxYguYUPP2e1NK4d7E7ZOLiyYCcbFBiTMyID+2wvm2w6+pZ/odMA7cRkjhsPbltwBOrLg==",
+      "dev": true,
+      "requires": {
+        "ansi-colors": "^4.1.1"
+      }
+    },
     "entities": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/entities/-/entities-2.2.0.tgz",
@@ -1076,18 +1171,211 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
       "dev": true
     },
+    "eslint": {
+      "version": "7.20.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.20.0.tgz",
+      "integrity": "sha512-qGi0CTcOGP2OtCQBgWZlQjcTuP0XkIpYFj25XtRTQSHC+umNnp7UMshr2G8SLsRFYDdAPFeHOsiteadmMH02Yw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "7.12.11",
+        "@eslint/eslintrc": "^0.3.0",
+        "ajv": "^6.10.0",
+        "chalk": "^4.0.0",
+        "cross-spawn": "^7.0.2",
+        "debug": "^4.0.1",
+        "doctrine": "^3.0.0",
+        "enquirer": "^2.3.5",
+        "eslint-scope": "^5.1.1",
+        "eslint-utils": "^2.1.0",
+        "eslint-visitor-keys": "^2.0.0",
+        "espree": "^7.3.1",
+        "esquery": "^1.4.0",
+        "esutils": "^2.0.2",
+        "file-entry-cache": "^6.0.0",
+        "functional-red-black-tree": "^1.0.1",
+        "glob-parent": "^5.0.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.0.0",
+        "imurmurhash": "^0.1.4",
+        "is-glob": "^4.0.0",
+        "js-yaml": "^3.13.1",
+        "json-stable-stringify-without-jsonify": "^1.0.1",
+        "levn": "^0.4.1",
+        "lodash": "^4.17.20",
+        "minimatch": "^3.0.4",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.9.1",
+        "progress": "^2.0.0",
+        "regexpp": "^3.1.0",
+        "semver": "^7.2.1",
+        "strip-ansi": "^6.0.0",
+        "strip-json-comments": "^3.1.0",
+        "table": "^6.0.4",
+        "text-table": "^0.2.0",
+        "v8-compile-cache": "^2.0.3"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+          "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.10.4"
+          }
+        },
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "dev": true
+        },
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
+        },
+        "semver": {
+          "version": "7.3.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
+          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        }
+      }
+    },
+    "eslint-scope": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.1.tgz",
+      "integrity": "sha512-2NxwbF/hZ0KpepYN0cNbo+FN6XoK7GaHlQhgx/hIZl6Va0bF45RQOOwhLIy8lQDbuCiadSLCBnH2CFYquit5bw==",
+      "dev": true,
+      "requires": {
+        "esrecurse": "^4.3.0",
+        "estraverse": "^4.1.1"
+      }
+    },
+    "eslint-utils": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-2.1.0.tgz",
+      "integrity": "sha512-w94dQYoauyvlDc43XnGB8lU3Zt713vNChgt4EWwhXAP2XkBvndfxF0AgIqKOOasjPIPzj9JqgwkwbCYD0/V3Zg==",
+      "dev": true,
+      "requires": {
+        "eslint-visitor-keys": "^1.1.0"
+      },
+      "dependencies": {
+        "eslint-visitor-keys": {
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz",
+          "integrity": "sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==",
+          "dev": true
+        }
+      }
+    },
+    "eslint-visitor-keys": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-2.0.0.tgz",
+      "integrity": "sha512-QudtT6av5WXels9WjIM7qz1XD1cWGvX4gGXvp/zBn9nXG02D0utdU3Em2m/QjTnrsk6bBjmCygl3rmj118msQQ==",
+      "dev": true
+    },
+    "espree": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-7.3.1.tgz",
+      "integrity": "sha512-v3JCNCE64umkFpmkFGqzVKsOT0tN1Zr+ueqLZfpV1Ob8e+CEgPWa+OxCoGH3tnhimMKIaBm4m/vaRpJ/krRz2g==",
+      "dev": true,
+      "requires": {
+        "acorn": "^7.4.0",
+        "acorn-jsx": "^5.3.1",
+        "eslint-visitor-keys": "^1.3.0"
+      },
+      "dependencies": {
+        "eslint-visitor-keys": {
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz",
+          "integrity": "sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==",
+          "dev": true
+        }
+      }
+    },
     "esprima": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
       "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
       "dev": true
     },
+    "esquery": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/esquery/-/esquery-1.4.0.tgz",
+      "integrity": "sha512-cCDispWt5vHHtwMY2YrAQ4ibFkAL8RbH5YGBnZBc90MolvvfkkQcJro/aZiAQUlQ3qgrYS6D6v8Gc5G5CQsc9w==",
+      "dev": true,
+      "requires": {
+        "estraverse": "^5.1.0"
+      },
+      "dependencies": {
+        "estraverse": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.2.0.tgz",
+          "integrity": "sha512-BxbNGGNm0RyRYvUdHpIwv9IWzeM9XClbOxwoATuFdOE7ZE6wHL+HQ5T8hoPM+zHvmKzzsEqhgy0GrQ5X13afiQ==",
+          "dev": true
+        }
+      }
+    },
+    "esrecurse": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.3.0.tgz",
+      "integrity": "sha512-KmfKL3b6G+RXvP8N1vr3Tq1kL/oCFgn2NYXEtqP8/L3pKapUA4G8cFVaoF3SU323CD4XypR/ffioHmkti6/Tag==",
+      "dev": true,
+      "requires": {
+        "estraverse": "^5.2.0"
+      },
+      "dependencies": {
+        "estraverse": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.2.0.tgz",
+          "integrity": "sha512-BxbNGGNm0RyRYvUdHpIwv9IWzeM9XClbOxwoATuFdOE7ZE6wHL+HQ5T8hoPM+zHvmKzzsEqhgy0GrQ5X13afiQ==",
+          "dev": true
+        }
+      }
+    },
+    "estraverse": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.3.0.tgz",
+      "integrity": "sha512-39nnKffWz8xN1BU/2c79n9nB9HDzo0niYUqx6xyqUnyoAnQyyWpOTdZEeiCch8BBu515t4wp9ZmgVfVhn9EBpw==",
+      "dev": true
+    },
     "estree-walker": {
       "version": "2.0.2",
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+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -2611,6 +3169,15 @@
         "is-number": "^7.0.0"
       }
     },
+    "type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "^1.2.1"
+      }
+    },
     "type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
@@ -2632,12 +3199,27 @@
         "is-typedarray": "^1.0.0"
       }
     },
+    "uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "uuid": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
       "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
       "dev": true
     },
+    "v8-compile-cache": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.2.0.tgz",
+      "integrity": "sha512-gTpR5XQNKFwOd4clxfnhaqvfqMpqEwr4tOtCyz4MtYZX2JYhfr1JvBFKdS+7K/9rfpZR3VLX+YWBbKoxCgS43Q==",
+      "dev": true
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -2662,6 +3244,12 @@
         "string-width": "^1.0.2 || 2"
       }
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "workerpool": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.1.0.tgz",
@@ -2767,6 +3355,12 @@
       "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
       "dev": true
     },
+    "yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true
+    },
     "yargs": {
       "version": "16.2.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",

package.json

@@ -50,9 +50,44 @@
   ],
   "scripts": {
     "test": "nyc --reporter=html --reporter=text mocha \"test/*/_index.js\"",
+    "lint": "eslint .",
     "test-browser": "rollup -c && node ./test/browser.js",
     "prepublishOnly": "rollup -c"
   },
+  "eslintConfig": {
+    "ignorePatterns": [
+      "dist",
+      "fixtures"
+    ],
+    "parserOptions": {
+      "ecmaVersion": "2021"
+    },
+    "env": {
+      "node": true,
+      "es2021": true
+    },
+    "extends": [
+      "eslint:recommended"
+    ],
+    "overrides": [
+      {
+        "files": [
+          "rollup.config.js"
+        ],
+        "parserOptions": {
+          "sourceType": "module"
+        }
+      },
+      {
+        "files": [
+          "test/**/*.js"
+        ],
+        "env": {
+          "mocha": true
+        }
+      }
+    ]
+  },
   "dependencies": {
     "chalk": "^4.1.0",
     "commander": "^7.1.0",
@@ -69,6 +104,7 @@
     "@rollup/plugin-node-resolve": "^11.2.0",
     "chai": "^4.3.0",
     "del": "^6.0.0",
+    "eslint": "^7.20.0",
     "mocha": "^8.3.0",
     "mock-stdin": "^1.0.0",
     "nyc": "^15.1.0",

plugins/_path.js

@@ -1,4 +1,3 @@
-/* global a2c */
 'use strict';
 
 var rNumber = String.raw`[-+]?(?:\d*\.\d+|\d+\.?)(?:[eE][-+]?\d+)?\s*`,
@@ -61,7 +60,6 @@ exports.path2js = function(path) {
             }
         // data item
         } else {
-            /* jshint boss: true */
             if (instruction == 'A' || instruction == 'a') {
                 var newData = [];
                 for (var args; (args = regArcArgumentSequence.exec(data));) {
@@ -652,7 +650,9 @@ exports.intersects = function(path1, path2) {
                 direction = minus(simplex[0]); // set the direction to point towards the origin
 
             var iterations = 1e4; // infinite loop protection, 10 000 iterations is more than enough
+            // eslint-disable-next-line no-constant-condition
             while (true) {
+                // eslint-disable-next-line no-constant-condition
                 if (iterations-- == 0) {
                     console.error('Error: infinite loop while processing mergePaths plugin.');
                     return true; // true is the safe value that means “do nothing with paths”
@@ -689,11 +689,10 @@ exports.intersects = function(path1, path2) {
 };
 
 function processSimplex(simplex, direction) {
-    /* jshint -W004 */
 
     // we only need to handle to 1-simplex and 2-simplex
     if (simplex.length == 2) { // 1-simplex
-        var a = simplex[1],
+        let a = simplex[1],
             b = simplex[0],
             AO = minus(simplex[1]),
             AB = sub(b, a);
@@ -707,7 +706,7 @@ function processSimplex(simplex, direction) {
             simplex.shift();
         }
     } else { // 2-simplex
-        var a = simplex[2], // [a, b, c] = simplex
+        let a = simplex[2], // [a, b, c] = simplex
             b = simplex[1],
             c = simplex[0],
             AB = sub(b, a),
@@ -846,7 +845,6 @@ function gatherPoints(points, item, index, path) {
  * @param points An array of [X, Y] coordinates
  */
 function convexHull(points) {
-    /* jshint -W004 */
 
     points.sort(function(a, b) {
         return a[0] == b[0] ? a[1] - b[1] : a[0] - b[0];
@@ -855,7 +853,7 @@ function convexHull(points) {
     var lower = [],
         minY = 0,
         bottom = 0;
-    for (var i = 0; i < points.length; i++) {
+    for (let i = 0; i < points.length; i++) {
         while (lower.length >= 2 && cross(lower[lower.length - 2], lower[lower.length - 1], points[i]) <= 0) {
             lower.pop();
         }
@@ -869,7 +867,7 @@ function convexHull(points) {
     var upper = [],
         maxY = points.length - 1,
         top = 0;
-    for (var i = points.length; i--;) {
+    for (let i = points.length; i--;) {
         while (upper.length >= 2 && cross(upper[upper.length - 2], upper[upper.length - 1], points[i]) <= 0) {
             upper.pop();
         }
@@ -902,7 +900,6 @@ function cross(o, a, b) {
  * Thanks to Dmitry Baranovskiy for his great work!
  */
 
-// jshint ignore: start
 function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursive) {
     // for more information of where this Math came from visit:
     // http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
@@ -983,4 +980,3 @@ function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursiv
         return newres;
     }
 }
-// jshint ignore: end

plugins/_transforms.js

@@ -20,7 +20,6 @@ exports.transform2js = function(transformString) {
 
     // split value into ['', 'translate', '10 50', '', 'scale', '2', '', 'rotate', '-45', '']
     transformString.split(regTransformSplit).forEach(function(item) {
-        /*jshint -W084 */
         var num;
 
         if (item) {
@@ -31,6 +30,7 @@ exports.transform2js = function(transformString) {
             // else if item is data
             } else {
                 // then split it into [10, 50] and collect as context.data
+                // eslint-disable-next-line no-cond-assign
                 while (num = regNumericValues.exec(item)) {
                     num = Number(num);
                     if (current.data)

plugins/cleanupEnableBackground.js

@@ -23,7 +23,7 @@ exports.description = 'remove or cleanup enable-background attribute when possib
  */
 exports.fn = function(data) {
 
-    var regEnableBackground = /^new\s0\s0\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)$/,
+    var regEnableBackground = /^new\s0\s0\s([-+]?\d*\.?\d+([eE][-+]?\d+)?)\s([-+]?\d*\.?\d+([eE][-+]?\d+)?)$/,
         hasFilter = false,
         elems = ['svg', 'mask', 'pattern'];
 

plugins/cleanupListOfValues.js

@@ -13,7 +13,7 @@ exports.params = {
     convertToPx: true
 };
 
-var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
+var regNumericValues = /^([-+]?\d*\.?\d+([eE][-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
     regSeparator = /\s+,?\s*|,\s*/,
     removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
     absoluteLengths = { // relative to px

plugins/cleanupNumericValues.js

@@ -13,7 +13,7 @@ exports.params = {
     convertToPx: true
 };
 
-var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
+var regNumericValues = /^([-+]?\d*\.?\d+([eE][-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
     removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
     absoluteLengths = { // relative to px
         cm: 96/2.54,

plugins/collapseGroups.js

@@ -11,7 +11,6 @@ var collections = require('./_collections'),
     animationElems = collections.elemsGroups.animation;
 
 function hasAnimatedAttr(item) {
-    /* jshint validthis:true */
     return item.isElem(animationElems) && item.hasAttr('attributeName', this) ||
         !item.isEmpty() && item.content.some(hasAnimatedAttr, this);
 }

plugins/convertColors.js

@@ -18,7 +18,7 @@ var collections = require('./_collections'),
     rNumber = '([+-]?(?:\\d*\\.\\d+|\\d+\\.?)%?)',
     rComma = '\\s*,\\s*',
     regRGB = new RegExp('^rgb\\(\\s*' + rNumber + rComma + rNumber + rComma + rNumber + '\\s*\\)$'),
-    regHEX = /^\#(([a-fA-F0-9])\2){3}$/,
+    regHEX = /^#(([a-fA-F0-9])\2){3}$/,
     none = /\bnone\b/i;
 
 /**

plugins/convertStyleToAttrs.js

@@ -1,4 +1,3 @@
-/* jshint quotmark: false */
 'use strict';
 
 exports.type = 'perItem';
@@ -56,7 +55,6 @@ var stylingProps = require('./_collections').attrsGroups.presentation,
  * @author Kir Belevich
  */
 exports.fn = function(item, params) {
-    /* jshint boss: true */
 
     if (item.elem && item.hasAttr('style')) {
             // ['opacity: 1', 'color: #000']
@@ -71,6 +69,7 @@ exports.fn = function(item, params) {
         });
 
         regDeclarationBlock.lastIndex = 0;
+        // eslint-disable-next-line no-cond-assign
         for (var rule; rule = regDeclarationBlock.exec(styleValue);) {
             if (!params.keepImportant || !rule[3]) {
                 styles.push([rule[1], rule[2]]);

plugins/convertTransform.js

@@ -110,7 +110,6 @@ function convertTransform(item, attrName, params) {
  * @return {Array} output array
  */
 function definePrecision(data, params) {
-    /* jshint validthis: true */
     var matrixData = data.reduce(getMatrixData, []),
         significantDigits = params.transformPrecision;
 

plugins/moveElemsAttrsToGroup.js

@@ -108,6 +108,7 @@ function intersectInheritableAttrs(a, b) {
 
     for (var n in a) {
         if (
+            // eslint-disable-next-line no-prototype-builtins
             b.hasOwnProperty(n) &&
             inheritableAttrs.indexOf(n) > -1 &&
             a[n].name === b[n].name &&

plugins/prefixIds.js

@@ -30,7 +30,7 @@ const unquote = (string) => {
 
 // Escapes a string for being used as ID
 var escapeIdentifierName = function(str) {
-    return str.replace(/[\. ]/g, '_');
+    return str.replace(/[. ]/g, '_');
 };
 
 // Matches an #ID value, captures the ID name
@@ -151,7 +151,7 @@ var addPrefixToBeginEndAttr = function(attr) {
 
 const getBasename = (path) => {
   // extract everything after latest slash or backslash
-  const matched = path.match(/[\/\\]([^\/\\]+)$/);
+  const matched = path.match(/[/\\]([^/\\]+)$/);
   if (matched) {
     return matched[1];
   }

test/plugins/_index.js

@@ -30,8 +30,7 @@ describe('plugins tests', function() {
                     var splitted = normalize(data).split(/\s*@@@\s*/),
                         orig     = splitted[0],
                         should   = splitted[1],
-                        params   = splitted[2],
+                        params   = splitted[2];
-                        svgo;
                     const plugin = {
                       name,
                       params: (params ? JSON.parse(params) : {}),

test/svg2js/_index.js

@@ -71,8 +71,8 @@ describe('svg2js', function() {
                 expect(root.content[0].processinginstruction).to.have.property('name', 'xml');
             });
 
-            it('should have property "body" with value "version=\"1.0\" encoding=\"utf-8\""', function() {
+            it('should have property "body" with value `version="1.0" encoding="utf-8"`', function() {
-                expect(root.content[0].processinginstruction).to.have.property('body', 'version=\"1.0\" encoding=\"utf-8\"');
+                expect(root.content[0].processinginstruction).to.have.property('body', 'version="1.0" encoding="utf-8"');
             });
 
         });
@@ -96,7 +96,7 @@ describe('svg2js', function() {
             });
 
             it('should eventually equal " svg PUBLIC…"', function() {
-                expect(root.content[2].doctype).to.equal(' svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\"');
+                expect(root.content[2].doctype).to.equal(' svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"');
             });
 
         });