feat: use real regex instead of strings

Fixes #165

Author: lishaduck

.eslintrc.js

@@ -4,6 +4,7 @@ const error = "error";
 const warn = process.argv.includes("--report-unused-disable-directives")
   ? "error"
   : "warn";
+const off = "off";
 
 module.exports = {
   root: true,
@@ -61,6 +62,7 @@ module.exports = {
     eqeqeq: [error, "always", { null: "ignore" }],
     strict: error,
     yoda: warn,
+    "no-control-regex": off,
   },
   overrides: [
     {

examples/.eslintrc.js

@@ -77,20 +77,20 @@ module.exports = {
               // Note that if you use the `node:` prefix for Node.js builtins,
               // you can avoid this complexity: You can simply use "^node:".
               [
-                "^(assert|buffer|child_process|cluster|console|constants|crypto|dgram|dns|domain|events|fs|http|https|module|net|os|path|punycode|querystring|readline|repl|stream|string_decoder|sys|timers|tls|tty|url|util|vm|zlib|freelist|v8|process|async_hooks|http2|perf_hooks)(/.*|$)",
+                /^(assert|buffer|child_process|cluster|console|constants|crypto|dgram|dns|domain|events|fs|http|https|module|net|os|path|punycode|querystring|readline|repl|stream|string_decoder|sys|timers|tls|tty|url|util|vm|zlib|freelist|v8|process|async_hooks|http2|perf_hooks)(\/.*|$)/u,
               ],
               // Packages. `react` related packages come first.
-              ["^react", "^@?\\w"],
+              [/^react/u, /^@?\w/u],
               // Internal packages.
-              ["^(@|@company|@ui|components|utils|config|vendored-lib)(/.*|$)"],
+              [/^(@|@company|@ui|components|utils|config|vendored-lib)(\/.*|$)/u],
               // Side effect imports.
-              ["^\\u0000"],
+              [/^\u0000/u],
               // Parent imports. Put `..` last.
-              ["^\\.\\.(?!/?$)", "^\\.\\./?$"],
+              [/^\.\.(?!\/?$)/u, /^\.\.\/?$/u],
               // Other relative imports. Put same-folder imports and `.` last.
-              ["^\\./(?=.*/)(?!/?$)", "^\\.(?!/?$)", "^\\./?$"],
+              [/^\.\/(?=.*\/)(?!\/?$)/u, /^\.(?!\/?$)/u, /^\.\/?$/u],
               // Style imports.
-              ["^.+\\.s?css$"],
+              [/^.+\.s?css$/u],
             ],
           },
         ],
@@ -103,7 +103,7 @@ module.exports = {
           "error",
           {
             // The default grouping, but with no blank lines.
-            groups: [["^\\u0000", "^node:", "^@?\\w", "^", "^\\."]],
+            groups: [[/^\u0000/u, /^node:/u, /^@?\w/u, /^/u, /^\./u]],
           },
         ],
       },
@@ -115,7 +115,7 @@ module.exports = {
           "error",
           {
             // The default grouping, but in reverse.
-            groups: [["^\\."], ["^"], ["^@?\\w"], ["^node:"], ["^\\u0000"]],
+            groups: [[/^\./u], [/^/u], [/^@?\w/u], [/^node:/u], [/^\u0000/u]],
           },
         ],
       },
@@ -128,7 +128,7 @@ module.exports = {
           "error",
           {
             // The default grouping, but with type imports first as a separate group.
-            groups: [["^.*\\u0000$"], ["^\\u0000"], ["^node:"], ["^@?\\w"], ["^"], ["^\\."]],
+            groups: [[/^.*\u0000$/u], [/^\u0000/u], [/^node:/u], [/^@?\w/u], [/^/u], [/^\./u]],
           },
         ],
       },
@@ -141,7 +141,7 @@ module.exports = {
           "error",
           {
             // The default grouping, but with type imports last as a separate group.
-            groups: [["^\\u0000"], ["^node:"], ["^@?\\w"], ["^"], ["^\\."], ["^.+\\u0000$"]],
+            groups: [[/^\u0000/u], [/^node:/u], [/^@?\w/u], [/^/u], [/^\./u], [/^.+\u0000$/u]],
           },
         ],
       },
@@ -156,12 +156,12 @@ module.exports = {
             // The default grouping, but with type imports first as a separate
             // group, sorting that group like non-type imports are grouped.
             groups: [
-              ["^node:.*\\u0000$", "^@?\\w.*\\u0000$", "^[^.].*\\u0000$", "^\\..*\\u0000$"],
-              ["^\\u0000"],
-              ["^node:"],
-              ["^@?\\w"],
-              ["^"],
-              ["^\\."],
+              [/^node:.*\u0000$/u, /^@?\w.*\u0000$/u, /^[^.].*\u0000$/u, /^\..*\u0000$/u],
+              [/^\u0000/u],
+              [/^node:/u],
+              [/^@?\w/u],
+              [/^/u],
+              [/^\./u],
             ],
           },
         ],
@@ -177,12 +177,12 @@ module.exports = {
             // The default grouping, but with type imports last as a separate
             // group, sorting that group like non-type imports are grouped.
             groups: [
-              ["^\\u0000"],
-              ["^node:"],
-              ["^@?\\w"],
-              ["^"],
-              ["^\\."],
-              ["^node:.*\\u0000$", "^@?\\w.*\\u0000$", "^[^.].*\\u0000$", "^\\..*\\u0000$"],
+              [/^\u0000/u],
+              [/^node:/u],
+              [/^@?\w/u],
+              [/^/u],
+              [/^\./u],
+              [/^node:.*\u0000$/u, /^@?\w.*\u0000$/u, /^[^.].*\u0000$/u, /^\..*\u0000$/u],
             ],
           },
         ],
@@ -197,11 +197,11 @@ module.exports = {
           {
             // The default grouping, but with type imports first in each group.
             groups: [
-              ["^\\u0000"],
-              ["^node:.*\\u0000$", "^node:"],
-              ["^@?\\w.*\\u0000$", "^@?\\w"],
-              ["(?<=\\u0000)$", "^"],
-              ["^\\..*\\u0000$", "^\\."],
+              [/^\u0000/u],
+              [/^node:.*\u0000$/u, /^node:/u],
+              [/^@?\w.*\u0000$/u, /^@?\w/u],
+              [/(?<=\u0000)$/u, /^/u],
+              [/^\..*\u0000$/u, /^\./u],
             ],
           },
         ],
@@ -216,11 +216,11 @@ module.exports = {
           {
             // The default grouping, but with type imports last in each group.
             groups: [
-              ["^\\u0000"],
-              ["^node:", "^node:.*\\u0000$"],
-              ["^@?\\w", "^@?\\w.*\\u0000$"],
-              ["(?<!\\u0000)$", "(?<=\\u0000)$"],
-              ["^\\.", "^\\..*\\u0000$"],
+              [/^\u0000/u],
+              [/^node:/u, /^node:.*\u0000$/u],
+              [/^@?\w/u, /^@?\w.*\u0000$/u],
+              [/(?<!\u0000)$/u, /(?<=\u0000)$/u],
+              [/^\./u, /^\..*\u0000$/u],
             ],
           },
         ],

src/imports.js

@@ -1,21 +1,23 @@
 "use strict";
+// @ts-check
+// @ts-check
 
 const shared = require("./shared");
 
 const defaultGroups = [
   // Side effect imports.
-  ["^\\u0000"],
+  [/^\u0000/u],
   // Node.js builtins prefixed with `node:`.
-  ["^node:"],
+  [/^node:/u],
   // Packages.
   // Things that start with a letter (or digit or underscore), or `@` followed by a letter.
-  ["^@?\\w"],
+  [/^@?\w/u],
   // Absolute imports and other imports such as Vue-style `@/foo`.
   // Anything not matched in another group.
-  ["^"],
+  [/^/u],
   // Relative imports.
   // Anything that starts with a dot.
-  ["^\\."],
+  [/^\./u],
 ];
 
 module.exports = {
@@ -30,9 +32,7 @@ module.exports = {
             type: "array",
             items: {
               type: "array",
-              items: {
-                type: "string",
-              },
+              uniqueItems: true,
             },
           },
         },
@@ -51,7 +51,7 @@ module.exports = {
     const { groups: rawGroups = defaultGroups } = context.options[0] || {};
 
     const outerGroups = rawGroups.map((groups) =>
-      groups.map((item) => RegExp(item, "u")),
+      groups.map((item) => (item instanceof RegExp ? item : RegExp(item, "u"))),
     );
 
     const parents = new Set();