feat(upgrade): adding postinstall script to exports private eslint api

lib/rules/decorator-position.js

@@ -1,5 +1,9 @@
 'use strict';
 
+const { CLIEngine } = require('eslint/eslint-plugin-decorator-position');
+
+const cli = new CLIEngine();
+
 module.exports = {
   meta: {
     type: 'layout',
@@ -134,7 +138,9 @@ function decoratorPositionRule(context) {
   }
 
   const userOptions = context.options[0] || {};
-  const options = normalizeOptions(userOptions);
+  const filePath = context.getFilename();
+  const { printWidth } = lineLength(userOptions, filePath);
+  const options = normalizeOptions({ ...userOptions, printWidth });
 
   return {
     // eslint v7
@@ -308,6 +314,52 @@ function configuredDecoratorsInOptions(options) {
   return allConfigs.map((config) => config[0]);
 }
 
+function lineLength(userOptions, filePath) {
+  if (!prettier) {
+    try {
+      // we acknowledge that this might not exist
+      // eslint-disable-next-line node/no-unpublished-require
+      prettier = require('prettier');
+    } catch (error) {
+      // throw an all errors that aren't "Cannot find module"
+      if (!error.message.includes('Cannot find module')) {
+        throw error;
+      }
+    }
+  }
+
+  const eslintPrettierRules = cli.getConfigForFile(filePath).rules['prettier/prettier'] || [];
+  const isEnabled = eslintPrettierRules[0] === 'error';
+
+  if (!isEnabled) {
+    return { printWidth: Infinity };
+  }
+
+  const eslintPrettierOptions = eslintPrettierRules[1] || {};
+  const usePrettierrc = !eslintPrettierOptions || eslintPrettierOptions.usePrettierrc !== false;
+  const prettierRcOptions =
+    prettier && usePrettierrc
+      ? prettier.resolveConfig.sync(filePath, {
+          editorconfig: true,
+        })
+      : {};
+
+  const prettierOptions = Object.assign({}, prettierRcOptions, eslintPrettierOptions, {
+    filePath,
+  });
+
+  if (prettier && !('printWidth' in prettierOptions)) {
+    // available at prettier/src/main/core-options
+    // keep an eye on this. There may have been an issue with prettier 2.2.0
+    // but I've been unable to get the tests to pass prior to this change with *any*
+    // prettier version (issue-reproduction/196 reproduces issue #214)
+    const defaultPrintWidth = prettier.__internal.coreOptions.options.printWidth.default;
+    return { ...prettierOptions, ...userOptions, printWidth: defaultPrintWidth };
+  }
+
+  return Object.assign({}, prettierOptions, userOptions);
+}
+
 function normalizeConfig(config, intent) {
   let name;
   let options = {};

package.json

@@ -24,7 +24,8 @@
     "test:coverage": "jest --coverage",
     "test:watch": "jest --watchAll",
     "update": "node ./scripts/update-rules.js",
-    "semantic-release": "semantic-release"
+    "semantic-release": "semantic-release",
+    "postinstall": "node ./scripts/postinstall.js"
   },
   "repository": {
     "type": "git",
@@ -58,8 +59,12 @@
   },
   "homepage": "https://github.com/NullVoxPopuli/eslint-plugin-decorator-position#readme",
   "devDependencies": {
+    "@babel/core": "^7.18.6",
+    "@babel/eslint-parser": "^7.18.2",
+    "@babel/plugin-proposal-decorators": "^7.18.6",
     "@commitlint/cli": "16.1.0",
     "@commitlint/config-conventional": "16.0.0",
+    "@eslint/eslintrc": "^1.3.0",
     "@semantic-release/changelog": "6.0.1",
     "@semantic-release/git": "10.0.1",
     "@typescript-eslint/parser": "5.30.5",
@@ -72,6 +77,7 @@
     "eslint-plugin-import": "2.26.0",
     "eslint-plugin-jest": "26.5.3",
     "eslint-plugin-markdown": "1.0.2",
+    "eslint-plugin-md": "^1.0.19",
     "eslint-plugin-node": "11.1.0",
     "eslint-plugin-prettier": "4.0.0",
     "jest": "27.4.7",
@@ -83,12 +89,8 @@
     "typescript": "4.5.5"
   },
   "dependencies": {
-    "@babel/core": "^7.18.6",
-    "@babel/eslint-parser": "^7.18.2",
-    "@babel/plugin-proposal-decorators": "^7.18.6",
     "@ember-data/rfc395-data": "^0.0.4",
     "ember-rfc176-data": "^0.3.12",
-    "eslint-plugin-md": "^1.0.19",
     "snake-case": "^3.0.3"
   },
   "peerDependencies": {

scripts/postinstall.js

@@ -0,0 +1,37 @@
+const { join } = require('path');
+const { existsSync: isExists, writeFileSync: write, readFileSync: read } = require('fs');
+
+const eslintPath = findNearestEslintPackage();
+const eslintPackageJson = join(eslintPath, 'package.json');
+
+const packageJson = JSON.parse(
+  read(eslintPackageJson, {
+    encoding: 'utf-8',
+  })
+);
+
+const fileName = 'eslint-plugin-decorator-position';
+const filePath = join(eslintPath, `${fileName}.js`);
+write(
+  filePath,
+  `module.exports = {
+      CLIEngine: require("./lib/cli-engine").CLIEngine,
+    }`
+);
+
+if (packageJson.exports) {
+  packageJson.exports[`./${fileName}`] = `./${fileName}.js`;
+}
+
+write(eslintPackageJson, JSON.stringify(packageJson));
+
+function findNearestEslintPackage() {
+  let dir = __dirname;
+  while (!isExists(join(dir, 'node_modules', 'eslint'))) {
+    if (dir === join(dir, '..')) {
+      throw new Error('Cannot found Eslint package');
+    }
+    dir = join(dir, '..');
+  }
+  return join(dir, 'node_modules', 'eslint');
+}