Add naming-convention merger (#674)

Author: KingDarBoja

src/rules/mergers.ts

@@ -1,6 +1,7 @@
 import { mergeBanTypes } from "./mergers/ban-types";
 import { mergeConsistentTypeAssertions } from "./mergers/consistent-type-assertions";
 import { mergeIndent } from "./mergers/indent";
+import { mergeNamingConvention } from "./mergers/naming-convention";
 import { mergeNoCaller } from "./mergers/no-caller";
 import { mergeNoEval } from "./mergers/no-eval";
 import { mergeNoMemberDelimiterStyle } from "./mergers/member-delimiter-style";
@@ -12,6 +13,7 @@ export const mergers = new Map([
     ["@typescript-eslint/consistent-type-assertions", mergeConsistentTypeAssertions],
     ["@typescript-eslint/indent", mergeIndent],
     ["@typescript-eslint/member-delimiter-style", mergeNoMemberDelimiterStyle],
+    ["@typescript-eslint/naming-convention", mergeNamingConvention],
     ["@typescript-eslint/no-unnecessary-type-assertion", mergeNoUnnecessaryTypeAssertion],
     ["@typescript-eslint/triple-slash-reference", mergeTripleSlashReference],
     ["no-caller", mergeNoCaller],

src/rules/mergers/naming-convention.ts

@@ -0,0 +1,9 @@
+import { RuleMerger } from "../merger";
+
+export const mergeNamingConvention: RuleMerger = (existingOptions, newOptions) => {
+    if (existingOptions === undefined && newOptions === undefined) {
+        return [];
+    }
+
+    return [...(existingOptions ?? []), ...(newOptions ?? [])];
+};

src/rules/mergers/tests/naming-convention.test.ts

@@ -0,0 +1,96 @@
+import { mergeNamingConvention } from "../naming-convention";
+
+describe(mergeNamingConvention, () => {
+    test("neither options existing", () => {
+        const result = mergeNamingConvention(undefined, undefined);
+
+        expect(result).toEqual([]);
+    });
+
+    test("original variable name existing", () => {
+        const result = mergeNamingConvention(
+            [
+                {
+                    selector: "variable",
+                    format: ["camelCase", "UPPER_CASE"],
+                    leadingUnderscore: "forbid",
+                    trailingUnderscore: "forbid",
+                },
+            ],
+            undefined,
+        );
+
+        expect(result).toEqual([
+            {
+                selector: "variable",
+                format: ["camelCase", "UPPER_CASE"],
+                leadingUnderscore: "forbid",
+                trailingUnderscore: "forbid",
+            },
+        ]);
+    });
+
+    test("original interface name existing", () => {
+        const result = mergeNamingConvention(undefined, [
+            {
+                selector: "interface",
+                format: ["PascalCase"],
+                custom: {
+                    regex: "^I[A-Z]",
+                    match: false,
+                },
+            },
+        ]);
+
+        expect(result).toEqual([
+            {
+                selector: "interface",
+                format: ["PascalCase"],
+                custom: {
+                    regex: "^I[A-Z]",
+                    match: false,
+                },
+            },
+        ]);
+    });
+
+    test("both interface and variable name existing", () => {
+        const result = mergeNamingConvention(
+            [
+                {
+                    selector: "variable",
+                    format: ["camelCase", "UPPER_CASE"],
+                    leadingUnderscore: "forbid",
+                    trailingUnderscore: "forbid",
+                },
+            ],
+            [
+                {
+                    selector: "interface",
+                    format: ["PascalCase"],
+                    custom: {
+                        regex: "^I[A-Z]",
+                        match: false,
+                    },
+                },
+            ],
+        );
+
+        expect(result).toEqual([
+            {
+                selector: "variable",
+                format: ["camelCase", "UPPER_CASE"],
+                leadingUnderscore: "forbid",
+                trailingUnderscore: "forbid",
+            },
+            {
+                selector: "interface",
+                format: ["PascalCase"],
+                custom: {
+                    regex: "^I[A-Z]",
+                    match: false,
+                },
+            },
+        ]);
+    });
+});