refactor: replace 'fast-equals' and 'micro-memoize' with builtins

examples/dual-react-dom-lib/package.json

@@ -33,7 +33,7 @@
     "@eslint/js": "^9.17.0",
     "@tsconfig/node22": "^22.0.0",
     "@tsconfig/strictest": "^2.0.5",
-    "@types/node": "^22.10.4",
+    "@types/node": "^22.10.5",
     "@types/react": "^19.0.2",
     "eslint": "^9.17.0",
     "eslint-plugin-react-hooks": "^5.1.0",

examples/next-app/package.json

@@ -17,11 +17,11 @@
   },
   "devDependencies": {
     "@eslint-react/eslint-plugin": "^1.23.1",
-    "@eslint/config-inspector": "^0.6.0",
+    "@eslint/config-inspector": "^0.7.0",
     "@eslint/js": "^9.17.0",
     "@next/eslint-plugin-next": "^15.1.3",
     "@types/negotiator": "^0.6.3",
-    "@types/node": "^22.10.4",
+    "@types/node": "^22.10.5",
     "@types/react": "^19.0.2",
     "@types/react-dom": "^19.0.2",
     "autoprefixer": "10.4.20",

examples/vite-react-dom-app/package.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "@eslint-react/eslint-plugin": "^1.23.1",
-    "@eslint/config-inspector": "^0.6.0",
+    "@eslint/config-inspector": "^0.7.0",
     "@eslint/js": "^9.17.0",
     "@tsconfig/node22": "^22.0.0",
     "@tsconfig/strictest": "^2.0.5",

examples/vite-react-dom-js-app/package.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "@eslint-react/eslint-plugin": "^1.23.1",
-    "@eslint/config-inspector": "^0.6.0",
+    "@eslint/config-inspector": "^0.7.0",
     "@eslint/js": "^9.17.0",
     "@types/react": "^19.0.2",
     "@types/react-dom": "^19.0.2",

examples/vite-react-dom-js-with-babel-app/package.json

@@ -20,7 +20,7 @@
     "@babel/preset-env": "^7.26.0",
     "@babel/preset-react": "^7.26.3",
     "@eslint-react/eslint-plugin": "^1.23.1",
-    "@eslint/config-inspector": "^0.6.0",
+    "@eslint/config-inspector": "^0.7.0",
     "@eslint/js": "^9.17.0",
     "@types/babel__core": "~7.20.5",
     "@types/babel__preset-env": "~7.9.7",

package.json

@@ -56,12 +56,12 @@
     "@effect/platform-bun": "^0.52.0",
     "@effect/platform-node": "^0.68.0",
     "@effect/schema": "^0.75.5",
-    "@eslint/config-inspector": "^0.6.0",
+    "@eslint/config-inspector": "^0.7.0",
     "@eslint/js": "^9.17.0",
     "@swc/core": "^1.10.4",
     "@tsconfig/node22": "^22.0.0",
     "@tsconfig/strictest": "^2.0.5",
-    "@types/node": "^22.10.4",
+    "@types/node": "^22.10.5",
     "@types/react": "^19.0.2",
     "@types/react-dom": "^19.0.2",
     "@typescript-eslint/parser": "^8.19.0",

packages/core/src/element/get-element-represent-name.ts

@@ -1,13 +1,13 @@
 import { F, isString, O } from "@eslint-react/eff";
 import * as JSX from "@eslint-react/jsx";
-import { decodeSettings, normalizeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleContext } from "@eslint-react/types";
 import type { TSESTree } from "@typescript-eslint/types";
 
 export function getElementRepresentName(node: TSESTree.JSXOpeningElement, context: RuleContext) {
   const rawElementName = JSX.getElementName(node);
   if (rawElementName === rawElementName.toLowerCase()) return rawElementName;
-  const { components, polymorphicPropName } = normalizeSettings(decodeSettings(context.settings));
+  const { components, polymorphicPropName } = getSettingsFromContext(context);
   const asElementName = components.get(rawElementName);
   if (isString(asElementName)) return asElementName;
   return F.pipe(

packages/plugins/eslint-plugin-react-debug/src/rules/is-from-react.ts

@@ -1,6 +1,6 @@
 import { isInitializedFromReact } from "@eslint-react/core";
 import { F, O } from "@eslint-react/eff";
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import type { Scope } from "@typescript-eslint/scope-manager";
 import type { TSESTree } from "@typescript-eslint/utils";
@@ -33,7 +33,7 @@ export default createRule<[], MessageID>({
   },
   name: RULE_NAME,
   create(context) {
-    const settings = decodeSettings(context.settings);
+    const settings = getSettingsFromContext(context);
     const finalSettings = {
       ...settings,
       strictImportCheck: true,

packages/plugins/eslint-plugin-react-dom/src/rules/no-unknown-property.ts

@@ -4,7 +4,7 @@
 // Ported from https://github.com/jsx-eslint/eslint-plugin-react/blob/master/lib/rules/no-unknown-property.js
 // TODO: Port to TypeScript
 
-import { decodeSettings, normalizeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import { createRule } from "../utils";
 import { compare, compareVersions } from "compare-versions";
 import type { RuleFeature } from "@eslint-react/types";
@@ -1203,6 +1203,6 @@ function report(context, message, messageId, data) {
 }
 
 function testReactVersion(context, comparator, version) {
-  const { version: localVersion } = normalizeSettings(decodeSettings(context.settings));
+  const { version: localVersion } = getSettingsFromContext(context);
   return compare(localVersion, version, comparator);
 }

packages/plugins/eslint-plugin-react-dom/src/rules/no-unsafe-target-blank.ts

@@ -1,7 +1,7 @@
 import { getElementRepresentName } from "@eslint-react/core";
 import { F, isString, O } from "@eslint-react/eff";
 import * as JSX from "@eslint-react/jsx";
-import { decodeSettings, normalizeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import type { TSESTree } from "@typescript-eslint/utils";
 import type { ReportDescriptor } from "@typescript-eslint/utils/ts-eslint";
@@ -44,7 +44,7 @@ export default createRule<[], MessageID>({
   },
   name: RULE_NAME,
   create(context) {
-    const settings = normalizeSettings(decodeSettings(context.settings));
+    const settings = getSettingsFromContext(context);
     const additionalComponents = settings.additionalComponents.filter(c => c.as === "a");
     function getReportDescriptor(node: TSESTree.JSXElement): O.Option<ReportDescriptor<MessageID>> {
       const name = JSX.getElementName(node.openingElement);

packages/plugins/eslint-plugin-react-hooks-extra/src/rules/no-direct-set-state-in-use-effect.ts

@@ -1,7 +1,7 @@
 import * as AST from "@eslint-react/ast";
 import { isReactHookCallWithNameAlias } from "@eslint-react/core";
 import { F, O } from "@eslint-react/eff";
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import * as VAR from "@eslint-react/var";
 import { AST_NODE_TYPES } from "@typescript-eslint/types";
@@ -43,7 +43,7 @@ export default createRule<[], MessageID>({
   name: RULE_NAME,
   create(context) {
     if (!/use\w*Effect/u.test(context.sourceCode.text)) return {};
-    const settings = decodeSettings(context.settings);
+    const settings = getSettingsFromContext(context);
     const additionalHooks = settings.additionalHooks ?? {};
 
     const isUseEffectLikeCall = isReactHookCallWithNameAlias("useEffect", context, additionalHooks.useEffect ?? []);

packages/plugins/eslint-plugin-react-hooks-extra/src/rules/no-direct-set-state-in-use-layout-effect.ts

@@ -1,7 +1,7 @@
 import * as AST from "@eslint-react/ast";
 import { isReactHookCallWithNameAlias } from "@eslint-react/core";
 import { F, O } from "@eslint-react/eff";
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import * as VAR from "@eslint-react/var";
 import { AST_NODE_TYPES } from "@typescript-eslint/types";
@@ -44,7 +44,7 @@ export default createRule<[], MessageID>({
   name: RULE_NAME,
   create(context) {
     if (!/use\w*Effect/u.test(context.sourceCode.text)) return {};
-    const settings = decodeSettings(context.settings);
+    const settings = getSettingsFromContext(context);
     const additionalHooks = settings.additionalHooks ?? {};
 
     const isUseLayoutEffectLikeCall = isReactHookCallWithNameAlias(

packages/plugins/eslint-plugin-react-hooks-extra/src/rules/no-unnecessary-use-callback.ts

@@ -1,7 +1,7 @@
 import * as AST from "@eslint-react/ast";
 import { isReactHookCall, isReactHookCallWithNameLoose, isUseCallbackCall } from "@eslint-react/core";
 import { F, O } from "@eslint-react/eff";
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import * as VAR from "@eslint-react/var";
 import { AST_NODE_TYPES } from "@typescript-eslint/types";
@@ -34,7 +34,7 @@ export default createRule<[], MessageID>({
   name: RULE_NAME,
   create(context) {
     if (!context.sourceCode.text.includes("use")) return {};
-    const alias = decodeSettings(context.settings).additionalHooks?.useCallback ?? [];
+    const alias = getSettingsFromContext(context).additionalHooks?.useCallback ?? [];
     return {
       CallExpression(node) {
         if (!isReactHookCall(node)) return;

packages/plugins/eslint-plugin-react-hooks-extra/src/rules/no-unnecessary-use-memo.ts

@@ -1,7 +1,7 @@
 import * as AST from "@eslint-react/ast";
 import { isReactHookCall, isReactHookCallWithNameLoose, isUseMemoCall } from "@eslint-react/core";
 import { F, O } from "@eslint-react/eff";
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import * as VAR from "@eslint-react/var";
 import { AST_NODE_TYPES } from "@typescript-eslint/types";
@@ -33,7 +33,7 @@ export default createRule<[], MessageID>({
   name: RULE_NAME,
   create(context) {
     if (!context.sourceCode.text.includes("use")) return {};
-    const alias = decodeSettings(context.settings).additionalHooks?.useMemo ?? [];
+    const alias = getSettingsFromContext(context).additionalHooks?.useMemo ?? [];
     return {
       CallExpression(node) {
         if (!isReactHookCall(node)) return;

packages/plugins/eslint-plugin-react-hooks-extra/src/rules/prefer-use-state-lazy-initialization.ts

@@ -1,7 +1,7 @@
 // Ported from https://github.com/jsx-eslint/eslint-plugin-react/pull/3579/commits/ebb739a0fe99a2ee77055870bfda9f67a2691374
 import * as AST from "@eslint-react/ast";
 import { isReactHookCall, isReactHookCallWithNameLoose, isUseStateCall } from "@eslint-react/core";
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import type { CamelCase } from "string-ts";
 
@@ -35,7 +35,7 @@ export default createRule<[], MessageID>({
   name: RULE_NAME,
   create(context) {
     if (!context.sourceCode.text.includes("use")) return {};
-    const alias = decodeSettings(context.settings).additionalHooks?.useState ?? [];
+    const alias = getSettingsFromContext(context).additionalHooks?.useState ?? [];
     return {
       CallExpression(node) {
         if (!isReactHookCall(node)) return;

packages/plugins/eslint-plugin-react-naming-convention/src/rules/use-state.ts

@@ -1,6 +1,6 @@
 import { isReactHookCallWithNameLoose, isUseStateCall, useComponentCollector } from "@eslint-react/core";
 import { F, O } from "@eslint-react/eff";
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import { AST_NODE_TYPES } from "@typescript-eslint/types";
 import type { ReportDescriptor } from "@typescript-eslint/utils/ts-eslint";
@@ -39,7 +39,7 @@ export default createRule<[], MessageID>({
   },
   name: RULE_NAME,
   create(context) {
-    const alias = decodeSettings(context.settings).additionalHooks?.useState ?? [];
+    const alias = getSettingsFromContext(context).additionalHooks?.useState ?? [];
     const { ctx, listeners } = useComponentCollector(context);
 
     return {

packages/plugins/eslint-plugin-react-x/src/rules/no-context-provider.ts

@@ -1,5 +1,5 @@
 import * as JSX from "@eslint-react/jsx";
-import { decodeSettings, normalizeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import { compare } from "compare-versions";
 import type { CamelCase } from "string-ts";
@@ -31,7 +31,7 @@ export default createRule<[], MessageID>({
   name: RULE_NAME,
   create(context) {
     if (!context.sourceCode.text.includes(".Provider")) return {};
-    const { version } = normalizeSettings(decodeSettings(context.settings));
+    const { version } = getSettingsFromContext(context);
     if (compare(version, "19.0.0", "<")) return {};
     return {
       JSXElement(node) {

packages/plugins/eslint-plugin-react-x/src/rules/no-forward-ref.ts

@@ -1,7 +1,7 @@
 import * as AST from "@eslint-react/ast";
 import { isForwardRefCall } from "@eslint-react/core";
 import { O } from "@eslint-react/eff";
-import { decodeSettings, normalizeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleContext, RuleFeature } from "@eslint-react/types";
 import type { TSESTree } from "@typescript-eslint/types";
 import { AST_NODE_TYPES } from "@typescript-eslint/types";
@@ -37,7 +37,7 @@ export default createRule<[], MessageID>({
   name: RULE_NAME,
   create(context) {
     if (!context.sourceCode.text.includes("forwardRef")) return {};
-    const { version } = normalizeSettings(decodeSettings(context.settings));
+    const { version } = getSettingsFromContext(context);
     if (compare(version, "19.0.0", "<")) return {};
     return {
       CallExpression(node) {

packages/plugins/eslint-plugin-react-x/src/rules/no-leaked-conditional-rendering.ts

@@ -1,6 +1,6 @@
 import * as AST from "@eslint-react/ast";
 import { F, O } from "@eslint-react/eff";
-import { decodeSettings, normalizeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import * as VAR from "@eslint-react/var";
 import type { Variable } from "@typescript-eslint/scope-manager";
@@ -218,7 +218,7 @@ export default createRule<[], MessageID>({
   create(context) {
     if (!context.sourceCode.text.includes("&&") && !context.sourceCode.text.includes("?")) return {};
 
-    const { version } = normalizeSettings(decodeSettings(context.settings));
+    const { version } = getSettingsFromContext(context);
 
     // Allowed left node type variants
     const allowedVariants = [

packages/plugins/eslint-plugin-react-x/src/rules/prefer-react-namespace-import.ts

@@ -1,4 +1,4 @@
-import { decodeSettings } from "@eslint-react/shared";
+import { getSettingsFromContext } from "@eslint-react/shared";
 import type { RuleFeature } from "@eslint-react/types";
 import type { TSESTree } from "@typescript-eslint/types";
 import type { CamelCase } from "string-ts";
@@ -29,7 +29,7 @@ export default createRule<[], MessageID>({
   },
   name: RULE_NAME,
   create(context) {
-    const importSource = decodeSettings(context.settings).importSource ?? "react";
+    const importSource = getSettingsFromContext(context).importSource ?? "react";
     return {
       [`ImportDeclaration[source.value="${importSource}"] ImportDefaultSpecifier`](
         node: TSESTree.ImportDefaultSpecifier,

packages/shared/docs/README.md

@@ -32,3 +32,4 @@
 
 - [defineSettings](functions/defineSettings.md)
 - [getReactVersion](functions/getReactVersion.md)
+- [getSettingsFromContext](functions/getSettingsFromContext.md)

packages/shared/docs/functions/getSettingsFromContext.md

@@ -0,0 +1,21 @@
+[**@eslint-react/shared**](../README.md)
+
+***
+
+[@eslint-react/shared](../README.md) / getSettingsFromContext
+
+# Function: getSettingsFromContext()
+
+> **getSettingsFromContext**(`context`): `ESLintReactSettingsNormalized`
+
+## Parameters
+
+### context
+
+#### settings
+
+`unknown`
+
+## Returns
+
+`ESLintReactSettingsNormalized`

packages/shared/package.json

@@ -42,8 +42,6 @@
   "dependencies": {
     "@eslint-react/eff": "workspace:*",
     "@typescript-eslint/utils": "^8.19.0",
-    "fast-equals": "^5.0.1",
-    "micro-memoize": "^4.1.2",
     "picomatch": "^4.0.2",
     "ts-pattern": "^5.6.0",
     "valibot": "^1.0.0-beta.9"

packages/shared/src/cache.ts

@@ -0,0 +1,3 @@
+import type { ESLintReactSettingsNormalized } from "./schemas";
+
+export const normalizedSettingsCache = new Map<unknown, ESLintReactSettingsNormalized>();