Eslint rule updates (#673)

* Install unicorn

* Add rules

* Fix issues

* Install sonarjs

* Set up rules

* Fix issues

* Install eslint-plugin-import and fix import extensions

* Simplify permitted error names

7 files changed, 19 insertions, 24 deletions

diff --git a/dev/bin/build.js b/dev/bin/build.js
index bc0a8cb8..e22159d6 100644
--- a/dev/bin/build.js
+++ b/dev/bin/build.js
@@ -195,12 +195,10 @@ async function build(buildDir, extDir, manifestUtil, variantNames, manifestPath,
                 await createZip(extDir, excludeFiles, fullFileName, sevenZipExes, onUpdate, dryRun);
             }
 
-            if (!dryRun) {
-                if (Array.isArray(fileCopies)) {
-                    for (const fileName2 of fileCopies) {
-                        const fileName2Safe = path.basename(fileName2);
-                        fs.copyFileSync(fullFileName, path.join(buildDir, fileName2Safe));
-                    }
+            if (!dryRun && Array.isArray(fileCopies)) {
+                for (const fileName2 of fileCopies) {
+                    const fileName2Safe = path.basename(fileName2);
+                    fs.copyFileSync(fullFileName, path.join(buildDir, fileName2Safe));
                 }
             }
         }
diff --git a/dev/build-libs.js b/dev/build-libs.js
index 15ab3c8d..f1570fad 100644
--- a/dev/build-libs.js
+++ b/dev/build-libs.js
@@ -64,6 +64,7 @@ export async function buildLibs() {
     const schemaFileNames = fs.readdirSync(schemaDir);
     const schemas = schemaFileNames.map((schemaFileName) => {
         /** @type {import('ajv').AnySchema} */
+        // eslint-disable-next-line sonarjs/prefer-immediate-return
         const result = parseJson(fs.readFileSync(path.join(schemaDir, schemaFileName), {encoding: 'utf8'}));
         return result;
     });
diff --git a/dev/data-error.js b/dev/data-error.js
index 5659245b..eb7f71bc 100644
--- a/dev/data-error.js
+++ b/dev/data-error.js
@@ -18,12 +18,14 @@
 /**
  * Schema validation error type.
  */
-class DataError extends Error {
+export class DataError extends Error {
     /**
      * @param {string} message
      */
     constructor(message) {
         super(message);
+        /** @type {string} */
+        this.name = 'DataError';
         /** @type {unknown} */
         this._data = void 0;
     }
@@ -32,7 +34,3 @@ class DataError extends Error {
     get data() { return this._data; }
     set data(value) { this._data = value; }
 }
-
-module.exports = {
-    DataError
-};
diff --git a/dev/generate-css-json.js b/dev/generate-css-json.js
index 26bdfa64..a837c9e2 100644
--- a/dev/generate-css-json.js
+++ b/dev/generate-css-json.js
@@ -101,11 +101,11 @@ export function formatRulesJson(rules) {
     for (const {selectors, styles} of rules) {
         if (ruleIndex > 0) { result += ','; }
         result += `\n${indent1}{\n${indent2}"selectors": `;
-        if (selectors.length === 1) {
-            result += `[${JSON.stringify(selectors[0], null, 4)}]`;
-        } else {
-            result += JSON.stringify(selectors, null, 4).replace(/\n/g, '\n' + indent2);
-        }
+        result += (
+            selectors.length === 1 ?
+            `[${JSON.stringify(selectors[0], null, 4)}]` :
+            JSON.stringify(selectors, null, 4).replace(/\n/g, '\n' + indent2)
+        );
         result += `,\n${indent2}"styles": [`;
         let styleIndex = 0;
         for (const [key, value] of styles) {
diff --git a/dev/lib/dexie.js b/dev/lib/dexie.js
index ffbd2923..83015e25 100644
--- a/dev/lib/dexie.js
+++ b/dev/lib/dexie.js
@@ -15,7 +15,6 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import Dexie from 'dexie';
-import 'dexie-export-import';
+export {default as Dexie} from 'dexie';
 
-export {Dexie};
+import 'dexie-export-import';
diff --git a/dev/schema-validate.js b/dev/schema-validate.js
index d1ffcf82..3ad247d9 100644
--- a/dev/schema-validate.js
+++ b/dev/schema-validate.js
@@ -18,6 +18,7 @@
 
 import Ajv from 'ajv';
 import {readFileSync} from 'fs';
+import {fileURLToPath} from 'url';
 import {JsonSchema} from '../ext/js/data/json-schema.js';
 import {DataError} from './data-error.js';
 import {parseJson} from './json.js';
@@ -32,7 +33,7 @@ class JsonSchemaAjv {
             strictTuples: false,
             allowUnionTypes: true
         });
-        const metaSchemaPath = require.resolve('ajv/dist/refs/json-schema-draft-07.json');
+        const metaSchemaPath = fileURLToPath(import.meta.resolve('ajv/dist/refs/json-schema-draft-07.json'));
         /** @type {import('ajv').AnySchemaObject} */
         const metaSchema = parseJson(readFileSync(metaSchemaPath, {encoding: 'utf8'}));
         ajv.addMetaSchema(metaSchema);
diff --git a/dev/util.js b/dev/util.js
index 89bd95da..eee16964 100644
--- a/dev/util.js
+++ b/dev/util.js
@@ -40,10 +40,8 @@ export function getAllFiles(baseDirectory, predicate = null) {
                 if (typeof predicate !== 'function' || predicate(relativeFileName, false)) {
                     results.push(relativeFileName);
                 }
-            } else if (stats.isDirectory()) {
-                if (typeof predicate !== 'function' || predicate(relativeFileName, true)) {
-                    directories.push(fullFileName);
-                }
+            } else if (stats.isDirectory() && (typeof predicate !== 'function' || predicate(relativeFileName, true))) {
+                directories.push(fullFileName);
             }
         }
     }