Add rule for Intl Locale Info API

.changeset/no-intl-locale-prototype-firstdayofweek.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-firstdayofweek` rule

.changeset/no-intl-locale-prototype-getcalendars.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-getcalendars` rule

.changeset/no-intl-locale-prototype-getcollations.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-getcollations` rule

.changeset/no-intl-locale-prototype-gethourcycles.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-gethourcycles` rule

.changeset/no-intl-locale-prototype-getnumberingsystems.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-getnumberingsystems` rule

.changeset/no-intl-locale-prototype-gettextinfo.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-gettextinfo` rule

.changeset/no-intl-locale-prototype-gettimezones.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-gettimezones` rule

.changeset/no-intl-locale-prototype-getweekinfo.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-es-x": minor
+---
+
+Add `es-x/no-intl-locale-prototype-getweekinfo` rule

docs/configs/index.md

@@ -26,6 +26,30 @@ export default [
 
 </details>
 
+## no-new-in-esnext-intl-api
+
+disallow the new stuff to be planned for the next yearly ECMAScript Intl API (ECMA-402) snapshot.\
+⚠️ This config will be changed in the minor versions of this plugin.
+
+```js
+import pluginESx from "eslint-plugin-es-x"
+export default [
+    pluginESx.configs['flat/no-new-in-esnext-intl-api']
+]
+```
+
+<details><summary> Legacy Config </summary>
+
+.eslintrc.*:
+
+```json
+{
+    "extends": ["plugin:es-x/no-new-in-esnext-intl-api"],
+}
+```
+
+</details>
+
 ## no-new-in-es2025
 
 disallow new stuff in ES2025.
@@ -1041,6 +1065,32 @@ export default [
 
 </details>
 
+## no-intl-locale-info
+
+disallow proposal ES2026 Intl API [Intl Locale Info API](https://github.com/tc39/proposal-intl-locale-info)\
+⚠️ This config will be changed in the minor versions of this plugin.
+
+This configs includes rules for [es-x/no-intl-locale-prototype-firstdayofweek](../rules/no-intl-locale-prototype-firstdayofweek.md), [es-x/no-intl-locale-prototype-getcalendars](../rules/no-intl-locale-prototype-getcalendars.md), [es-x/no-intl-locale-prototype-getcollations](../rules/no-intl-locale-prototype-getcollations.md), [es-x/no-intl-locale-prototype-gethourcycles](../rules/no-intl-locale-prototype-gethourcycles.md), [es-x/no-intl-locale-prototype-getnumberingsystems](../rules/no-intl-locale-prototype-getnumberingsystems.md), [es-x/no-intl-locale-prototype-gettextinfo](../rules/no-intl-locale-prototype-gettextinfo.md), [es-x/no-intl-locale-prototype-gettimezones](../rules/no-intl-locale-prototype-gettimezones.md), and [es-x/no-intl-locale-prototype-getweekinfo](../rules/no-intl-locale-prototype-getweekinfo.md).
+
+```js
+import pluginESx from "eslint-plugin-es-x"
+export default [
+    pluginESx.configs['flat/no-intl-locale-info']
+]
+```
+
+<details><summary> Legacy Config </summary>
+
+.eslintrc.*:
+
+```json
+{
+    "extends": ["plugin:es-x/no-intl-locale-info"],
+}
+```
+
+</details>
+
 ## no-float16array
 
 disallow proposal ES2025 [Float16Array](https://github.com/tc39/proposal-float16array)

docs/rules/index.md

@@ -19,6 +19,21 @@ There is a config that enables the rules in this category: [`no-new-in-esnext`]
 | [es-x/no-symbol-dispose](./no-symbol-dispose.md) | disallow the `Symbol.dispose` property. |  |
 | [es-x/no-using-declarations](./no-using-declarations.md) | disallow `using` and `await using` declarations. |  |
 
+## ES2026 Intl API
+
+There is a config that enables the rules in this category: [`no-new-in-esnext-intl-api`]
+
+| Rule ID | Description |    |
+|:--------|:------------|:--:|
+| [es-x/no-intl-locale-prototype-firstdayofweek](./no-intl-locale-prototype-firstdayofweek.md) | disallow the `Intl.Locale.prototype.firstDayOfWeek` property. |  |
+| [es-x/no-intl-locale-prototype-getcalendars](./no-intl-locale-prototype-getcalendars.md) | disallow the `Intl.Locale.prototype.getCalendars` method. |  |
+| [es-x/no-intl-locale-prototype-getcollations](./no-intl-locale-prototype-getcollations.md) | disallow the `Intl.Locale.prototype.getCollations` method. |  |
+| [es-x/no-intl-locale-prototype-gethourcycles](./no-intl-locale-prototype-gethourcycles.md) | disallow the `Intl.Locale.prototype.getHourCycles` method. |  |
+| [es-x/no-intl-locale-prototype-getnumberingsystems](./no-intl-locale-prototype-getnumberingsystems.md) | disallow the `Intl.Locale.prototype.getNumberingSystems` method. |  |
+| [es-x/no-intl-locale-prototype-gettextinfo](./no-intl-locale-prototype-gettextinfo.md) | disallow the `Intl.Locale.prototype.getTextInfo` method. |  |
+| [es-x/no-intl-locale-prototype-gettimezones](./no-intl-locale-prototype-gettimezones.md) | disallow the `Intl.Locale.prototype.getTimeZones` method. |  |
+| [es-x/no-intl-locale-prototype-getweekinfo](./no-intl-locale-prototype-getweekinfo.md) | disallow the `Intl.Locale.prototype.getWeekInfo` method. |  |
+
 ## ES2025
 
 There are multiple configs that enable all rules in this category: [`no-new-in-es2025`], [`restrict-to-es3`], [`restrict-to-es5`], [`restrict-to-es2015`], [`restrict-to-es2016`], [`restrict-to-es2017`], [`restrict-to-es2018`], [`restrict-to-es2019`], [`restrict-to-es2020`], [`restrict-to-es2021`], [`restrict-to-es2022`], [`restrict-to-es2023`], and [`restrict-to-es2024`]
@@ -498,6 +513,7 @@ Rules in this category are not included in any preset.
 | [es-x/no-string-prototype-iswellformed-towellformed](./no-string-prototype-iswellformed-towellformed.md) | [es-x/no-string-prototype-iswellformed](./no-string-prototype-iswellformed.md), [es-x/no-string-prototype-towellformed](./no-string-prototype-towellformed.md) |
 
 [`no-new-in-esnext`]: ../configs/index.md#no-new-in-esnext
+[`no-new-in-esnext-intl-api`]: ../configs/index.md#no-new-in-esnext-intl-api
 [`no-new-in-es2025`]: ../configs/index.md#no-new-in-es2025
 [`restrict-to-es2024`]: ../configs/index.md#restrict-to-es2024
 [`no-new-in-es2025-intl-api`]: ../configs/index.md#no-new-in-es2025-intl-api

docs/rules/no-intl-locale-prototype-firstdayofweek.md

@@ -0,0 +1,62 @@
+---
+title: "es-x/no-intl-locale-prototype-firstdayofweek"
+description: "disallow the `Intl.Locale.prototype.firstDayOfWeek` property"
+---
+
+# es-x/no-intl-locale-prototype-firstdayofweek
+> disallow the `Intl.Locale.prototype.firstDayOfWeek` property
+
+- ❗ <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+- ✅ The following configurations enable this rule: [no-intl-locale-info] and [no-new-in-esnext-intl-api]
+
+This rule reports ES2026 Intl API [`Intl.Locale.prototype.firstDayOfWeek` property](https://github.com/tc39/proposal-intl-locale-info) as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-intl-locale-prototype-firstdayofweek: error */
+const foo = new Intl.Locale();
+foo.firstDayOfWeek;
+```
+
+</eslint-playground>
+
+## 🔧 Options
+
+This rule has an option.
+
+```jsonc
+{
+  "rules": {
+    "es-x/no-intl-locale-prototype-firstdayofweek": [
+      "error",
+      {
+        "aggressive": false,
+        "allowTestedProperty": false
+      }
+    ]
+  }
+}
+```
+
+### aggressive: boolean
+
+Configure the aggressive mode for only this rule.
+This is prior to the `settings['es-x'].aggressive` setting.
+
+### allowTestedProperty: boolean
+
+Configure the allowTestedProperty mode for only this rule.
+This is prior to the `settings['es-x'].allowTestedProperty` setting.
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-intl-locale-prototype-firstdayofweek.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-intl-locale-prototype-firstdayofweek.js)
+
+[no-intl-locale-info]: ../configs/index.md#no-intl-locale-info
+[no-new-in-esnext-intl-api]: ../configs/index.md#no-new-in-esnext-intl-api

docs/rules/no-intl-locale-prototype-getcalendars.md

@@ -0,0 +1,62 @@
+---
+title: "es-x/no-intl-locale-prototype-getcalendars"
+description: "disallow the `Intl.Locale.prototype.getCalendars` method"
+---
+
+# es-x/no-intl-locale-prototype-getcalendars
+> disallow the `Intl.Locale.prototype.getCalendars` method
+
+- ❗ <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+- ✅ The following configurations enable this rule: [no-intl-locale-info] and [no-new-in-esnext-intl-api]
+
+This rule reports ES2026 Intl API [`Intl.Locale.prototype.getCalendars` method](https://github.com/tc39/proposal-intl-locale-info) as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-intl-locale-prototype-getcalendars: error */
+const foo = new Intl.Locale();
+foo.getCalendars();
+```
+
+</eslint-playground>
+
+## 🔧 Options
+
+This rule has an option.
+
+```jsonc
+{
+  "rules": {
+    "es-x/no-intl-locale-prototype-getcalendars": [
+      "error",
+      {
+        "aggressive": false,
+        "allowTestedProperty": false
+      }
+    ]
+  }
+}
+```
+
+### aggressive: boolean
+
+Configure the aggressive mode for only this rule.
+This is prior to the `settings['es-x'].aggressive` setting.
+
+### allowTestedProperty: boolean
+
+Configure the allowTestedProperty mode for only this rule.
+This is prior to the `settings['es-x'].allowTestedProperty` setting.
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-intl-locale-prototype-getcalendars.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-intl-locale-prototype-getcalendars.js)
+
+[no-intl-locale-info]: ../configs/index.md#no-intl-locale-info
+[no-new-in-esnext-intl-api]: ../configs/index.md#no-new-in-esnext-intl-api

docs/rules/no-intl-locale-prototype-getcollations.md

@@ -0,0 +1,62 @@
+---
+title: "es-x/no-intl-locale-prototype-getcollations"
+description: "disallow the `Intl.Locale.prototype.getCollations` method"
+---
+
+# es-x/no-intl-locale-prototype-getcollations
+> disallow the `Intl.Locale.prototype.getCollations` method
+
+- ❗ <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+- ✅ The following configurations enable this rule: [no-intl-locale-info] and [no-new-in-esnext-intl-api]
+
+This rule reports ES2026 Intl API [`Intl.Locale.prototype.getCollations` method](https://github.com/tc39/proposal-intl-locale-info) as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-intl-locale-prototype-getcollations: error */
+const foo = new Intl.Locale();
+foo.getCollations();
+```
+
+</eslint-playground>
+
+## 🔧 Options
+
+This rule has an option.
+
+```jsonc
+{
+  "rules": {
+    "es-x/no-intl-locale-prototype-getcollations": [
+      "error",
+      {
+        "aggressive": false,
+        "allowTestedProperty": false
+      }
+    ]
+  }
+}
+```
+
+### aggressive: boolean
+
+Configure the aggressive mode for only this rule.
+This is prior to the `settings['es-x'].aggressive` setting.
+
+### allowTestedProperty: boolean
+
+Configure the allowTestedProperty mode for only this rule.
+This is prior to the `settings['es-x'].allowTestedProperty` setting.
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-intl-locale-prototype-getcollations.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-intl-locale-prototype-getcollations.js)
+
+[no-intl-locale-info]: ../configs/index.md#no-intl-locale-info
+[no-new-in-esnext-intl-api]: ../configs/index.md#no-new-in-esnext-intl-api

docs/rules/no-intl-locale-prototype-gethourcycles.md

@@ -0,0 +1,62 @@
+---
+title: "es-x/no-intl-locale-prototype-gethourcycles"
+description: "disallow the `Intl.Locale.prototype.getHourCycles` method"
+---
+
+# es-x/no-intl-locale-prototype-gethourcycles
+> disallow the `Intl.Locale.prototype.getHourCycles` method
+
+- ❗ <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+- ✅ The following configurations enable this rule: [no-intl-locale-info] and [no-new-in-esnext-intl-api]
+
+This rule reports ES2026 Intl API [`Intl.Locale.prototype.getHourCycles` method](https://github.com/tc39/proposal-intl-locale-info) as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-intl-locale-prototype-gethourcycles: error */
+const foo = new Intl.Locale();
+foo.getHourCycles();
+```
+
+</eslint-playground>
+
+## 🔧 Options
+
+This rule has an option.
+
+```jsonc
+{
+  "rules": {
+    "es-x/no-intl-locale-prototype-gethourcycles": [
+      "error",
+      {
+        "aggressive": false,
+        "allowTestedProperty": false
+      }
+    ]
+  }
+}
+```
+
+### aggressive: boolean
+
+Configure the aggressive mode for only this rule.
+This is prior to the `settings['es-x'].aggressive` setting.
+
+### allowTestedProperty: boolean
+
+Configure the allowTestedProperty mode for only this rule.
+This is prior to the `settings['es-x'].allowTestedProperty` setting.
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-intl-locale-prototype-gethourcycles.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-intl-locale-prototype-gethourcycles.js)
+
+[no-intl-locale-info]: ../configs/index.md#no-intl-locale-info
+[no-new-in-esnext-intl-api]: ../configs/index.md#no-new-in-esnext-intl-api