feat add demo linter

Author: yeonjuan

src/lib/linter.ts

@@ -0,0 +1,73 @@
+import { TS_ESLINT } from "@/lib/constants";
+import type { Linter } from "eslint";
+import type { ParserOptions } from "@typescript-eslint/types";
+
+const PARSER_NAME = "@typescript-eslint/parser";
+
+interface ESLintPlugin {
+  rules: Linter.RulesRecord;
+  config: Linter.Config;
+}
+
+export interface DemoLintResult {
+  messages: Linter.LintMessage[];
+  fixReport: Linter.FixReport;
+}
+
+export interface DemoLinter {
+  lint(
+    code: string,
+    parserOptions: ParserOptions,
+    rules: Linter.RulesRecord
+  ): DemoLintResult;
+}
+
+function loadPlugin(): Promise<ESLintPlugin> {
+  return import("@typescript-eslint/eslint-plugin");
+}
+
+function loadParser() {
+  return import(`@/lib/parser`);
+}
+
+async function loadESLinter() {
+  return import("eslint/lib/linter/linter");
+}
+
+export async function loadDemoLinter(): Promise<DemoLinter> {
+  const plugins = loadPlugin();
+  const parser = loadParser();
+  const ESLinter = loadESLinter();
+
+  const linter = new (await ESLinter).Linter();
+
+  const rules = Object.entries((await plugins).rules).reduce(
+    (rules, [name, rule]) => ({
+      ...rules,
+      [`${TS_ESLINT}/${name}`]: rule,
+    })
+  );
+
+  linter.defineParser(PARSER_NAME, await parser);
+  linter.defineRules(rules);
+
+  return {
+    lint(
+      code: string,
+      parserOptions: ParserOptions,
+      rules: Linter.RulesRecord
+    ): DemoLintResult {
+      const messages: Linter.LintMessage[] = linter.verify(code, {
+        parser: PARSER_NAME,
+        parserOptions,
+        rules,
+      });
+      const fixReport: Linter.FixReport = linter.verifyAndFix(code, {
+        parser: PARSER_NAME,
+        parserOptions,
+        rules,
+      });
+      return { messages, fixReport };
+    },
+  };
+}