Add rules for Intl.DurationFormat

docs/configs/index.md

@@ -28,6 +28,32 @@ export default [
 }
 ```
 
+## 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.
+
+### [Config (Flat Config)]
+
+eslint.config.js:
+
+```js
+import pluginESx from "eslint-plugin-es-x"
+export default [
+    pluginESx.configs['flat/no-new-in-esnext-intl-api']
+]
+```
+
+### [Legacy Config]
+
+.eslintrc.*:
+
+```json
+{
+    "extends": ["plugin:es-x/no-new-in-esnext-intl-api"],
+}
+```
+
 ## no-new-in-es2024
 
 disallow new stuff in ES2024.

docs/rules/index.md

@@ -37,6 +37,14 @@ There is a config that enables the rules in this category: [`no-new-in-esnext`]
 | [es-x/no-set-prototype-union](./no-set-prototype-union.md) | disallow the `Set.prototype.union` method. |  |
 | [es-x/no-trailing-dynamic-import-commas](./no-trailing-dynamic-import-commas.md) | disallow trailing commas in `import()`. | 🔧 |
 
+## ES2025 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-durationformat](./no-intl-durationformat.md) | disallow the `Intl.DurationFormat` object. |  |
+
 ## ES2024
 
 There are multiple configs that enable all rules in this category: [`no-new-in-es2024`], [`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`], and [`restrict-to-es2023`]
@@ -406,6 +414,8 @@ Rules in this category are not included in any preset.
 | [es-x/no-nonstandard-intl-datetimeformat-prototype-properties](./no-nonstandard-intl-datetimeformat-prototype-properties.md) | disallow non-standard properties on Intl.DateTimeFormat instance. |  |
 | [es-x/no-nonstandard-intl-displaynames-properties](./no-nonstandard-intl-displaynames-properties.md) | disallow non-standard static properties on `Intl.DisplayNames` class. |  |
 | [es-x/no-nonstandard-intl-displaynames-prototype-properties](./no-nonstandard-intl-displaynames-prototype-properties.md) | disallow non-standard properties on Intl.DisplayNames instance. |  |
+| [es-x/no-nonstandard-intl-durationformat-properties](./no-nonstandard-intl-durationformat-properties.md) | disallow non-standard static properties on `Intl.DurationFormat` class. |  |
+| [es-x/no-nonstandard-intl-durationformat-prototype-properties](./no-nonstandard-intl-durationformat-prototype-properties.md) | disallow non-standard properties on Intl.DurationFormat instance. |  |
 | [es-x/no-nonstandard-intl-listformat-properties](./no-nonstandard-intl-listformat-properties.md) | disallow non-standard static properties on `Intl.ListFormat` class. |  |
 | [es-x/no-nonstandard-intl-listformat-prototype-properties](./no-nonstandard-intl-listformat-prototype-properties.md) | disallow non-standard properties on Intl.ListFormat instance. |  |
 | [es-x/no-nonstandard-intl-locale-properties](./no-nonstandard-intl-locale-properties.md) | disallow non-standard static properties on `Intl.Locale` class. |  |
@@ -463,6 +473,7 @@ 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-es2024`]: ../configs/index.md#no-new-in-es2024
 [`restrict-to-es2023`]: ../configs/index.md#restrict-to-es2023
 [`restrict-to-es2023-intl-api`]: ../configs/index.md#restrict-to-es2023-intl-api

docs/rules/no-intl-durationformat.md

@@ -0,0 +1,38 @@
+---
+title: "es-x/no-intl-durationformat"
+description: "disallow the `Intl.DurationFormat` object"
+---
+
+# es-x/no-intl-durationformat
+> disallow the `Intl.DurationFormat` object
+
+- ❗ <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-new-in-esnext-intl-api]
+
+This rule reports ES2025 Intl API `Intl.DurationFormat` object as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-intl-durationformat: error */
+const df = new Intl.DurationFormat("fr-FR", { style: "long" });
+
+df.format({
+    hours: 1,
+    minutes: 46,
+    seconds: 40,
+});
+```
+
+</eslint-playground>
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-intl-durationformat.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-intl-durationformat.js)
+
+[no-new-in-esnext-intl-api]: ../configs/index.md#no-new-in-esnext-intl-api

docs/rules/no-nonstandard-intl-durationformat-properties.md

@@ -0,0 +1,50 @@
+---
+title: "es-x/no-nonstandard-intl-durationformat-properties"
+description: "disallow non-standard static properties on `Intl.DurationFormat` class"
+---
+
+# es-x/no-nonstandard-intl-durationformat-properties
+> disallow non-standard static properties on `Intl.DurationFormat` class
+
+- ❗ <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+
+This rule reports non-standard static properties on `Intl.DurationFormat` class as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-nonstandard-intl-durationformat-properties: error */
+Intl.DurationFormat.unknown();
+```
+
+</eslint-playground>
+
+## 🔧 Options
+
+This rule has an option.
+
+```jsonc
+{
+  "rules": {
+    "es-x/no-nonstandard-intl-durationformat-properties": [
+      "error",
+      {
+        "allow": []
+      }
+    ]
+  }
+}
+```
+
+### allow: string[]
+
+An array of non-standard property names to allow.
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-nonstandard-intl-durationformat-properties.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-nonstandard-intl-durationformat-properties.js)

docs/rules/no-nonstandard-intl-durationformat-prototype-properties.md

@@ -0,0 +1,51 @@
+---
+title: "es-x/no-nonstandard-intl-durationformat-prototype-properties"
+description: "disallow non-standard properties on Intl.DurationFormat instance"
+---
+
+# es-x/no-nonstandard-intl-durationformat-prototype-properties
+> disallow non-standard properties on Intl.DurationFormat instance
+
+- ❗ <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+
+This rule reports non-standard properties on Intl.DurationFormat instance as errors.
+
+## 💡 Examples
+
+⛔ Examples of **incorrect** code for this rule:
+
+<eslint-playground type="bad">
+
+```js
+/*eslint es-x/no-nonstandard-intl-durationformat-prototype-properties: error */
+const df = new Intl.DurationFormat("fr-FR", { style: "long" });
+df.unknown();
+```
+
+</eslint-playground>
+
+## 🔧 Options
+
+This rule has an option.
+
+```jsonc
+{
+  "rules": {
+    "es-x/no-nonstandard-intl-durationformat-prototype-properties": [
+      "error",
+      {
+        "allow": []
+      }
+    ]
+  }
+}
+```
+
+### allow: string[]
+
+An array of non-standard property names to allow.
+
+## 📚 References
+
+- [Rule source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/lib/rules/no-nonstandard-intl-durationformat-prototype-properties.js)
+- [Test source](https://github.com/eslint-community/eslint-plugin-es-x/blob/master/tests/lib/rules/no-nonstandard-intl-durationformat-prototype-properties.js)

lib/configs/flat/no-new-in-esnext-intl-api.js

@@ -10,5 +10,5 @@ module.exports = {
             return require("../../index.js")
         },
     },
-    rules: {},
+    rules: { "es-x/no-intl-durationformat": "error" },
 }

lib/configs/no-new-in-esnext-intl-api.js

@@ -4,4 +4,7 @@
  */
 "use strict"
 
-module.exports = { plugins: ["es-x"], rules: {} }
+module.exports = {
+    plugins: ["es-x"],
+    rules: { "es-x/no-intl-durationformat": "error" },
+}

lib/index.js

@@ -213,6 +213,7 @@ module.exports = {
         "no-intl-datetimeformat-prototype-formatrange": require("./rules/no-intl-datetimeformat-prototype-formatrange"),
         "no-intl-datetimeformat-prototype-formattoparts": require("./rules/no-intl-datetimeformat-prototype-formattoparts"),
         "no-intl-displaynames": require("./rules/no-intl-displaynames"),
+        "no-intl-durationformat": require("./rules/no-intl-durationformat"),
         "no-intl-getcanonicallocales": require("./rules/no-intl-getcanonicallocales"),
         "no-intl-listformat": require("./rules/no-intl-listformat"),
         "no-intl-locale": require("./rules/no-intl-locale"),
@@ -287,6 +288,8 @@ module.exports = {
         "no-nonstandard-intl-datetimeformat-prototype-properties": require("./rules/no-nonstandard-intl-datetimeformat-prototype-properties"),
         "no-nonstandard-intl-displaynames-properties": require("./rules/no-nonstandard-intl-displaynames-properties"),
         "no-nonstandard-intl-displaynames-prototype-properties": require("./rules/no-nonstandard-intl-displaynames-prototype-properties"),
+        "no-nonstandard-intl-durationformat-properties": require("./rules/no-nonstandard-intl-durationformat-properties"),
+        "no-nonstandard-intl-durationformat-prototype-properties": require("./rules/no-nonstandard-intl-durationformat-prototype-properties"),
         "no-nonstandard-intl-listformat-properties": require("./rules/no-nonstandard-intl-listformat-properties"),
         "no-nonstandard-intl-listformat-prototype-properties": require("./rules/no-nonstandard-intl-listformat-prototype-properties"),
         "no-nonstandard-intl-locale-properties": require("./rules/no-nonstandard-intl-locale-properties"),

lib/rules/no-intl-durationformat.js

@@ -0,0 +1,27 @@
+"use strict"
+
+const {
+    defineStaticPropertiesHandler,
+} = require("../util/define-static-properties-handler")
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow the `Intl.DurationFormat` object.",
+            category: "ES2025-Intl-API",
+            recommended: false,
+            url: "http://eslint-community.github.io/eslint-plugin-es-x/rules/no-intl-durationformat.html",
+        },
+        fixable: null,
+        messages: {
+            forbidden: "ES2025 Intl API '{{name}}' object is forbidden.",
+        },
+        schema: [],
+        type: "problem",
+    },
+    create(context) {
+        return defineStaticPropertiesHandler(context, {
+            Intl: ["DurationFormat"],
+        })
+    },
+}

lib/rules/no-nonstandard-intl-durationformat-properties.js

@@ -0,0 +1,48 @@
+"use strict"
+
+const {
+    defineNonstandardStaticPropertiesHandler,
+} = require("../util/define-nonstandard-static-properties-handler")
+const {
+    intlDurationFormatProperties,
+} = require("../util/well-known-properties")
+
+module.exports = {
+    meta: {
+        docs: {
+            description:
+                "disallow non-standard static properties on `Intl.DurationFormat` class",
+            category: "nonstandard",
+            recommended: false,
+            url: "http://eslint-community.github.io/eslint-plugin-es-x/rules/no-nonstandard-intl-durationformat-properties.html",
+        },
+        fixable: null,
+        messages: {
+            forbidden: "Non-standard '{{name}}' property is forbidden.",
+        },
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allow: {
+                        type: "array",
+                        items: { type: "string" },
+                        uniqueItems: true,
+                    },
+                },
+                additionalProperties: false,
+            },
+        ],
+        type: "problem",
+    },
+    create(context) {
+        /** @type {Set<string>} */
+        const allows = new Set([
+            ...(context.options[0]?.allow || []),
+            ...intlDurationFormatProperties,
+        ])
+        return defineNonstandardStaticPropertiesHandler(context, {
+            "Intl.DurationFormat": allows,
+        })
+    },
+}

lib/rules/no-nonstandard-intl-durationformat-prototype-properties.js

@@ -0,0 +1,48 @@
+"use strict"
+
+const {
+    defineNonstandardPrototypePropertiesHandler,
+} = require("../util/define-nonstandard-prototype-properties-handler")
+const {
+    intlDurationFormatPrototypeProperties,
+} = require("../util/well-known-properties")
+
+module.exports = {
+    meta: {
+        docs: {
+            description:
+                "disallow non-standard properties on Intl.DurationFormat instance",
+            category: "nonstandard",
+            recommended: false,
+            url: "http://eslint-community.github.io/eslint-plugin-es-x/rules/no-nonstandard-intl-durationformat-prototype-properties.html",
+        },
+        fixable: null,
+        messages: {
+            forbidden: "Non-standard '{{name}}' property is forbidden.",
+        },
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allow: {
+                        type: "array",
+                        items: { type: "string" },
+                        uniqueItems: true,
+                    },
+                },
+                additionalProperties: false,
+            },
+        ],
+        type: "problem",
+    },
+    create(context) {
+        /** @type {Set<string>} */
+        const allows = new Set([
+            ...(context.options[0]?.allow || []),
+            ...intlDurationFormatPrototypeProperties,
+        ])
+        return defineNonstandardPrototypePropertiesHandler(context, {
+            "Intl.DurationFormat": allows,
+        })
+    },
+}

lib/util/type-checker/es-types.js

@@ -335,6 +335,11 @@ const WELLKNOWN_GLOBALS = {
                 return: { type: "Intl.DisplayNames" },
                 prototypeType: "Intl.DisplayNames",
             },
+            DurationFormat: {
+                type: "Function",
+                return: { type: "Intl.DurationFormat" },
+                prototypeType: "Intl.DurationFormat",
+            },
             Locale: {
                 type: "Function",
                 return: { type: "Intl.Locale" },

lib/util/type-checker/types.d.ts

@@ -11,6 +11,7 @@ export type TypeName =
   | "Intl.Segmenter"
   | "Intl.DisplayNames"
   | "Intl.Locale"
+  | "Intl.DurationFormat"
   | "Promise"
   | "RegExp"
   | "String"
@@ -193,7 +194,7 @@ export type FinalizationRegistryPrototypeProperty = Exclude<
   keyof FinalizationRegistry<any>,
   ExcludePrototypeProperty
 >;
-export type IntlProperty = Exclude<keyof typeof Intl, ExcludeProperty>;
+export type IntlProperty = Exclude<keyof typeof Intl, ExcludeProperty> | 'DurationFormat';
 export type IteratorProperty = Exclude<keyof typeof Iterator, ExcludeProperty>;
 export type IteratorPrototypeProperty = Exclude<
   keyof IteratorObject<any>,