Add n/prefer-node-protocol rule

README.md

@@ -143,6 +143,7 @@ For [Shareable Configs](https://eslint.org/docs/latest/developer-guide/shareable
 | [prefer-global/text-encoder](docs/rules/prefer-global/text-encoder.md)                       | enforce either `TextEncoder` or `require("util").TextEncoder`               |                 |    |    |
 | [prefer-global/url](docs/rules/prefer-global/url.md)                                         | enforce either `URL` or `require("url").URL`                                |                 |    |    |
 | [prefer-global/url-search-params](docs/rules/prefer-global/url-search-params.md)             | enforce either `URLSearchParams` or `require("url").URLSearchParams`        |                 |    |    |
+| [prefer-node-protocol](docs/rules/prefer-node-protocol.md)                                   | enforce using the `node:` protocol when importing Node.js builtin modules.  |                 | 🔧 |    |
 | [prefer-promises/dns](docs/rules/prefer-promises/dns.md)                                     | enforce `require("dns").promises`                                           |                 |    |    |
 | [prefer-promises/fs](docs/rules/prefer-promises/fs.md)                                       | enforce `require("fs").promises`                                            |                 |    |    |
 | [process-exit-as-throw](docs/rules/process-exit-as-throw.md)                                 | require that `process.exit()` expressions use the same code path as `throw` | ☑️ 🟢 ✅ ☑️ 🟢 ✅ |    |    |

docs/rules/prefer-node-protocol.md

@@ -0,0 +1,52 @@
+# Enforce using the `node:` protocol when importing Node.js builtin modules (`n/prefer-node-protocol`)
+
+🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
+
+<!-- end auto-generated rule header -->
+
+Older built-in Node modules such as fs now can be imported via either their name or `node:` + their name:
+
+```js
+import fs from "fs"
+import fs from "node:fs"
+```
+
+The prefixed versions are nice because they can't be overridden by user modules and are similarly formatted to prefix-only modules such as node:test.
+
+Note that Node.js support for this feature began in:
+
+> v16.0.0, v14.18.0 (`require()`)  
+> v14.13.1, v12.20.0 (`import`)
+
+## 📖 Rule Details
+
+This rule enforces that `node:` protocol is prepended to built-in Node modules when importing or exporting built-in Node modules.
+
+👍 Examples of **correct** code for this rule:
+
+```js
+/*eslint n/prefer-node-protocol: error */
+
+import fs from "node:fs"
+
+export { promises } from "node:fs"
+
+const fs = require("node:fs")
+```
+
+👎 Examples of **incorrect** code for this rule:
+
+```js
+/*eslint n/prefer-node-protocol: error */
+
+import fs from "fs"
+
+export { promises } from "fs"
+
+const fs = require("fs")
+```
+
+## 🔎 Implementation
+
+- [Rule source](../../lib/rules/prefer-node-protocol.js)
+- [Test source](../../tests/lib/rules/prefer-node-protocol.js)

lib/index.js

@@ -39,6 +39,7 @@ const rules = {
     "prefer-global/text-encoder": require("./rules/prefer-global/text-encoder"),
     "prefer-global/url-search-params": require("./rules/prefer-global/url-search-params"),
     "prefer-global/url": require("./rules/prefer-global/url"),
+    "prefer-node-protocol": require("./rules/prefer-node-protocol"),
     "prefer-promises/dns": require("./rules/prefer-promises/dns"),
     "prefer-promises/fs": require("./rules/prefer-promises/fs"),
     "process-exit-as-throw": require("./rules/process-exit-as-throw"),

lib/rules/prefer-node-protocol.js

@@ -0,0 +1,108 @@
+/**
+ * @author Yusuke Iinuma
+ * See LICENSE file in root directory for full license.
+ */
+"use strict"
+
+const isBuiltinModule = require("is-builtin-module")
+const messageId = "preferNodeProtocol"
+
+module.exports = {
+    meta: {
+        docs: {
+            description:
+                "enforce using the `node:` protocol when importing Node.js builtin modules.",
+            recommended: true,
+            url: "https://github.com/eslint-community/eslint-plugin-n/blob/HEAD/docs/rules/prefer-node-protocol.md",
+        },
+        fixable: "code",
+        messages: {
+            [messageId]: "Prefer `node:{{moduleName}}` over `{{moduleName}}`.",
+        },
+        schema: [],
+        type: "suggestion",
+    },
+    create(context) {
+        function isSourceForImportOrExport(node) {
+            return (
+                (node.parent.type === "ImportDeclaration" ||
+                    node.parent.type === "ExportNamedDeclaration" ||
+                    node.parent.type === "ImportExpression") &&
+                node.parent.source === node
+            )
+        }
+
+        function isCallExpression(node, { name, argumentsLength }) {
+            if (node?.type !== "CallExpression") {
+                return false
+            }
+
+            if (node.optional) {
+                return false
+            }
+
+            if (node.arguments.length !== argumentsLength) {
+                return false
+            }
+
+            if (
+                node.callee.type !== "Identifier" ||
+                node.callee.name !== name
+            ) {
+                return false
+            }
+
+            return true
+        }
+
+        function isStringLiteral(node) {
+            return node?.type === "Literal" && typeof node.type === "string"
+        }
+
+        function isStaticRequire(node) {
+            return (
+                isCallExpression(node, {
+                    name: "require",
+                    argumentsLength: 1,
+                }) && isStringLiteral(node.arguments[0])
+            )
+        }
+
+        return {
+            Literal(node) {
+                if (
+                    !(
+                        isSourceForImportOrExport(node) ||
+                        (isStaticRequire(node.parent) &&
+                            node.parent.arguments[0] === node)
+                    )
+                ) {
+                    return
+                }
+
+                const { value } = node
+
+                if (
+                    typeof value !== "string" ||
+                    value.startsWith("node:") ||
+                    !isBuiltinModule(value) ||
+                    !isBuiltinModule(`node:${value}`)
+                ) {
+                    return
+                }
+
+                context.report({
+                    node,
+                    messageId,
+                    fix(fixer) {
+                        const firstCharacterIndex = node.range[0] + 1
+                        return fixer.replaceTextRange(
+                            [firstCharacterIndex, firstCharacterIndex],
+                            "node:"
+                        )
+                    },
+                })
+            },
+        }
+    },
+}

tests/lib/rules/prefer-node-protocol.js

@@ -0,0 +1,173 @@
+/**
+ * @author Yusuke Iinuma
+ * See LICENSE file in root directory for full license.
+ */
+"use strict"
+
+const { RuleTester } = require("#eslint-rule-tester")
+const rule = require("../../../lib/rules/prefer-node-protocol.js")
+
+new RuleTester({
+    languageOptions: {
+        ecmaVersion: 2020,
+        sourceType: "module",
+    },
+}).run("prefer-node-protocol", rule, {
+    valid: [
+        'import nodePlugin from "eslint-plugin-n";',
+        'import fs from "./fs";',
+        'import fs from "unknown-builtin-module";',
+        'import fs from "node:fs";',
+        `
+            async function foo() {
+			    const fs = await import(fs);
+		    }
+        `,
+        `
+            async function foo() {
+                const fs = await import(0);
+            }
+        `,
+        `
+            async function foo() {
+                const fs = await import(\`fs\`);
+            }
+        `,
+        'import "punycode/";',
+        // https://bun.sh/docs/runtime/bun-apis
+        'import "bun";',
+        'import "bun:jsc";',
+        'import "bun:sqlite";',
+        'export {promises} from "node:fs";',
+
+        // `require`
+        'const fs = require("node:fs");',
+        'const fs = require("node:fs/promises");',
+        "const fs = require(fs);",
+        'const fs = notRequire("fs");',
+        'const fs = foo.require("fs");',
+        'const fs = require.resolve("fs");',
+        "const fs = require(`fs`);",
+        'const fs = require?.("fs");',
+        'const fs = require("fs", extra);',
+        "const fs = require();",
+        'const fs = require(...["fs"]);',
+        'const fs = require("eslint-plugin-n");',
+    ],
+    invalid: [
+        {
+            code: 'import fs from "fs";',
+            output: 'import fs from "node:fs";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'export {promises} from "fs";',
+            output: 'export {promises} from "node:fs";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: `
+                async function foo() {
+                    const fs = await import('fs');
+                }
+            `,
+            output: `
+                async function foo() {
+                    const fs = await import('node:fs');
+                }
+            `,
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'import fs from "fs/promises";',
+            output: 'import fs from "node:fs/promises";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'export {default} from "fs/promises";',
+            output: 'export {default} from "node:fs/promises";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: `
+                async function foo() {
+                    const fs = await import('fs/promises');
+                }
+            `,
+            output: `
+                async function foo() {
+                    const fs = await import('node:fs/promises');
+                }
+            `,
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'import {promises} from "fs";',
+            output: 'import {promises} from "node:fs";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'export {default as promises} from "fs";',
+            output: 'export {default as promises} from "node:fs";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: "import {promises} from 'fs';",
+            output: "import {promises} from 'node:fs';",
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: `
+                async function foo() {
+                    const fs = await import("fs/promises");
+                }
+            `,
+            output: `
+                async function foo() {
+                    const fs = await import("node:fs/promises");
+                }
+            `,
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: `
+                async function foo() {
+                    const fs = await import(/* escaped */"\\u{66}s/promises");
+                }
+            `,
+            output: `
+                async function foo() {
+                    const fs = await import(/* escaped */"node:\\u{66}s/promises");
+                }
+            `,
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'import "buffer";',
+            output: 'import "node:buffer";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'import "child_process";',
+            output: 'import "node:child_process";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: 'import "timers/promises";',
+            output: 'import "node:timers/promises";',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+
+        // `require`
+        {
+            code: 'const {promises} = require("fs")',
+            output: 'const {promises} = require("node:fs")',
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+        {
+            code: "const fs = require('fs/promises')",
+            output: "const fs = require('node:fs/promises')",
+            errors: ["Prefer `node:{{moduleName}}` over `{{moduleName}}`."],
+        },
+    ],
+})