feat: rule no-unormalized-keys

Fixes eslint#32

src/rules/no-unnormalized-keys.js

@@ -0,0 +1,48 @@
+/**
+ * @fileoverview Rule to detect unnormalized keys in JSON.
+ * @author Bradley Meck Farias
+ */
+
+export default {
+ meta: {
+ type: "problem",
+
+ docs: {
+ description: "Disallow JSON keys that are not normalized",
+ },
+
+ messages: {
+ unnormalizedKey: "Unnormalized key found.",
+ },
+
+ schema: {
+ type: "array",
+ minItems: 0,
+ maxItems: 1,
+ items: {
+ enum: ["NFC", "NFD", "NFKC", "NFKD"],
+ },
+ },
+ },
+
+ create(context) {
+ const normalization = context.options.length
+ ? s => s.normalize(context.options[0])
+ : s => s.normalize();
+ return {
+ Member(node) {
+ const key =
+ node.name.type === "String"
+ ? node.name.value
+ : node.name.name;
+
+ if (normalization(key) !== key) {
+ context.report({
+ loc: node.name.loc,
+ messageId: "unnormalizedKey",
+ });
+ }
+ },
+ };
+ },
+};

tests/rules/no-unnormalized-keys.js

@@ -0,0 +1,61 @@
+/**
+ * @fileoverview Tests for no-empty-keys rule.
+ * @author Bradley Meck Farias
+ */
+
+//------------------------------------------------------------------------------
+// Imports
+//------------------------------------------------------------------------------
+
+import rule from "../../src/rules/no-unnormalized-keys.js";
+import json from "../../src/index.js";
+import { RuleTester } from "eslint";
+
+//------------------------------------------------------------------------------
+// Tests
+//------------------------------------------------------------------------------
+
+const ruleTester = new RuleTester({
+ plugins: {
+ json,
+ },
+ language: "json/json",
+});
+
+const o = "\u1E9B\u0323";
+
+ruleTester.run("no-unnormalized-keys", rule, {
+ valid: [
+ `{"${o}":"NFC"}`,
+ {
+ code: `{"${o}":"NFC"}`,
+ options: ["NFC"],
+ },
+ {
+ code: `{"${o.normalize("NFD")}":"NFD"}`,
+ options: ["NFD"],
+ },
+ {
+ code: `{"${o.normalize("NFKC")}":"NFKC"}`,
+ options: ["NFKC"],
+ },
+ {
+ code: `{"${o.normalize("NFKD")}":"NFKD"}`,
+ options: ["NFKD"],
+ },
+ ],
+ invalid: [
+ {
+ code: `{"${o.normalize("NFD")}":"NFD"}`,
+ errors: [
+ {
+ messageId: "unnormalizedKey",
+ line: 1,
+ column: 2,
+ endLine: 1,
+ endColumn: 7,
+ },
+ ],
+ },
+ ],
+});