chore: Require eslint 7+ (#124)

BREAKING CHANGE: Requires eslint@7

lib/eslint.js

@@ -1,40 +1,25 @@
-const CLIEngine = require("eslint").CLIEngine;
 const ESLint = require("eslint").ESLint;
 const chalk = require("chalk");
 const EsplintError = require("./EsplintError");
 const { merge } = require("lodash");
 
 function creatEslintInstance(eslintConfig) {
-  if (ESLint) {
-    const eslint = new ESLint(eslintConfig);
-    return {
-      runLint: (files) => newRunLint(eslint, files),
-      getConfigForFile: (file) => newGetConfigForFile(eslint, file),
-    };
-  }
-
-  const cli = new CLIEngine(eslintConfig);
+  const eslint = new ESLint(eslintConfig);
   return {
-    runLint: (files) => runLint(cli, files),
-    getConfigForFile: (file) => getConfigForFile(cli, file),
+    runLint: (files) => runLint(eslint, files),
+    getConfigForFile: (file) => getConfigForFile(eslint, file),
   };
 }
 
 function overrideRulesConfig(config, rules) {
-  if (ESLint) {
-    return merge({}, config.eslint, {
-      overrideConfig: {
-        rules,
-      },
-    });
-  } else {
-    return merge({}, config.eslint, {
+  return merge({}, config.eslint, {
+    overrideConfig: {
       rules,
-    });
-  }
+    },
+  });
 }
 
-async function newRunLint(eslint, files) {
+async function runLint(eslint, files) {
   const results = await eslint.lintFiles(files);
   const errorResults = ESLint.getErrorResults(results);
   const hasErrors = Boolean(errorResults.length);
@@ -49,29 +34,10 @@ async function newRunLint(eslint, files) {
   return results;
 }
 
-async function runLint(eslintCli, files) {
-  const report = eslintCli.executeOnFiles(files);
-  const errorReport = CLIEngine.getErrorResults(report.results);
-  const hasErrors = Boolean(errorReport.length);
-  if (hasErrors) {
-    const formatter = eslintCli.getFormatter();
-    throw new EsplintError(
-      `There were some ESLint errors. Fix them and try again.\n${chalk.reset(
-        formatter(errorReport)
-      )}`
-    );
-  }
-  return report.results;
-}
-
-function newGetConfigForFile(eslint, file) {
+function getConfigForFile(eslint, file) {
   return eslint.calculateConfigForFile(file);
 }
 
-async function getConfigForFile(cli, file) {
-  return cli.getConfigForFile(file);
-}
-
 function getWarningRules({ rules }) {
   return Object.keys(rules).filter((name) => {
     const ruleConfig = rules[name];

package.json

@@ -41,7 +41,7 @@
     "strip-ansi": "^6.0.0"
   },
   "peerDependencies": {
-    "eslint": ">=4.19.1"
+    "eslint": ">=7.0.0"
   },
   "dependencies": {
     "chalk": "^4.0.0",