refactor: Prevent negated conditions

eslint.config.js

@@ -236,6 +236,7 @@ const configs = antfu(
       'unicorn/no-for-loop': 'error',
       'unicorn/no-invalid-remove-event-listener': 'error',
       'unicorn/no-lonely-if': 'error',
+      'unicorn/no-negated-condition': 'error',
       'unicorn/no-nested-ternary': 'error',
       'unicorn/no-process-exit': 'error',
       'unicorn/no-thenable': 'error',
@@ -269,8 +270,6 @@ const configs = antfu(
       'unicorn/require-number-to-fixed-digits-argument': 'error',
 
       // Might want to enable these
-      'unicorn/no-await-expression-member': 'off',
-      'unicorn/no-negated-condition': 'off',
       'unicorn/no-object-as-default-parameter': 'off',
 
       'unused-imports/no-unused-vars': [

src/http/UnsecureWebSocketsProtocol.ts

@@ -44,14 +44,14 @@ class WebSocketListener extends WebSocketListenerEmitter {
 
     // Verify the WebSocket protocol version
     const protocolHeader = headers['sec-websocket-protocol'];
-    if (!protocolHeader) {
-      this.sendMessage('warning', `Missing Sec-WebSocket-Protocol header, expected value '${VERSION}'`);
-    } else {
+    if (protocolHeader) {
       const supportedProtocols = splitCommaSeparated(protocolHeader);
       if (!supportedProtocols.includes(VERSION)) {
         this.sendMessage('error', `Client does not support protocol ${VERSION}`);
         this.stop();
       }
+    } else {
+      this.sendMessage('warning', `Missing Sec-WebSocket-Protocol header, expected value '${VERSION}'`);
     }
 
     // Store the HTTP host and protocol

src/server/WacAllowHttpHandler.ts

@@ -76,17 +76,17 @@ export class WacAllowHttpHandler extends OperationHttpHandler {
     if (permissionSet) {
       const user: AclPermissionSet = permissionSet;
       let everyone: AclPermissionSet;
-      if (!credentials.agent?.webId) {
-        // User is not authenticated so public permissions are the same as agent permissions
-        this.logger.debug('User is not authenticated so has public permissions');
-        everyone = user;
-      } else {
+      if (credentials.agent?.webId) {
         // Need to determine public permissions
         this.logger.debug('Determining public permissions');
         // Note that this call can potentially create a new lock on a resource that is already locked,
         // so a locker that allows multiple read locks on the same resource is required.
         const permissionMap = await this.permissionReader.handleSafe({ credentials: {}, requestedModes });
         everyone = permissionMap.get(operation.target) ?? {};
+      } else {
+        // User is not authenticated so public permissions are the same as agent permissions
+        this.logger.debug('User is not authenticated so has public permissions');
+        everyone = user;
       }
 
       this.logger.debug('Adding WAC-Allow metadata');

src/storage/keyvalue/WrappedIndexedStorage.ts

@@ -383,11 +383,7 @@ export class WrappedIndexedStorage<T extends IndexTypeCollection<T>> implements
     let oldObj: VirtualObject;
     let newObj: VirtualObject;
     const relation = this.getParentRelation(type);
-    if (!relation) {
-      oldObj = root;
-      newObj = (replace ? { ...partial } : { ...oldObj, ...partial }) as VirtualObject;
-      root = newObj;
-    } else {
+    if (relation) {
       const objs = this.getContainingRecord(root, type, id);
       if (partial[relation.child.key] && objs[id][relation.child.key] !== partial[relation.child.key]) {
         // eslint-disable-next-line ts/restrict-template-expressions
@@ -397,6 +393,10 @@ export class WrappedIndexedStorage<T extends IndexTypeCollection<T>> implements
       oldObj = objs[id];
       newObj = (replace ? { ...partial } : { ...oldObj, ...partial }) as VirtualObject;
       objs[id] = newObj;
+    } else {
+      oldObj = root;
+      newObj = (replace ? { ...partial } : { ...oldObj, ...partial }) as VirtualObject;
+      root = newObj;
     }
 
     // Copy over the child relations

src/util/GuardedStream.ts

@@ -88,14 +88,14 @@ function emitStoredErrors(this: Guarded, event: string, func: (error: Error) =>
  */
 export function guardStream<T extends NodeJS.EventEmitter>(stream: T): Guarded<T> {
   const guarded = stream as Guarded<T>;
-  if (!isGuarded(stream)) {
-    guarded[guardedErrors] = [];
-    guarded.on('error', guardingErrorListener);
-    guarded.on('newListener', emitStoredErrors);
-  } else {
+  if (isGuarded(stream)) {
     // This makes sure the guarding error listener is the last one in the list again
     guarded.removeListener('error', guardingErrorListener);
     guarded.on('error', guardingErrorListener);
+  } else {
+    guarded[guardedErrors] = [];
+    guarded.on('error', guardingErrorListener);
+    guarded.on('newListener', emitStoredErrors);
   }
   return guarded;
 }

src/util/PathUtil.ts

@@ -139,7 +139,7 @@ function transformPathComponents(path: string, transform: (part: string) => stri
     .map((part, index): string =>
       index % 2 === 0 ? transform(part) : part.toUpperCase())
     .join('');
-  return !queryString ? transformed : `${transformed}${queryString}`;
+  return queryString ? `${transformed}${queryString}` : transformed;
 }
 
 /**

src/util/QuadUtil.ts

@@ -72,8 +72,8 @@ export class FilterPattern {
    * @param object - Optionally filter based on a specific object.
    */
   public constructor(subject?: string, predicate?: string, object?: string) {
-    this.subject = typeof subject !== 'undefined' ? toNamedTerm(subject) : null;
-    this.predicate = typeof predicate !== 'undefined' ? toNamedTerm(predicate) : null;
-    this.object = typeof object !== 'undefined' ? toNamedTerm(object) : null;
+    this.subject = typeof subject === 'string' ? toNamedTerm(subject) : null;
+    this.predicate = typeof predicate === 'string' ? toNamedTerm(predicate) : null;
+    this.object = typeof object === 'string' ? toNamedTerm(object) : null;
   }
 }

src/util/SliceStream.ts

@@ -31,11 +31,11 @@ export class SliceStream extends Transform {
     let start = options.start;
     const end = options.end ?? Number.POSITIVE_INFINITY;
     if (options.start < 0) {
-      if (typeof options.size !== 'number') {
-        throw new RangeNotSatisfiedHttpError('Slicing data at the end of a stream requires a known size.');
-      } else {
+      if (typeof options.size === 'number') {
         // `start` is a negative number here so need to add
         start = options.size + start;
+      } else {
+        throw new RangeNotSatisfiedHttpError('Slicing data at the end of a stream requires a known size.');
       }
     }
 

test/unit/util/locking/BaseReadWriteLocker.test.ts

@@ -14,13 +14,12 @@ class MemoryLocker implements ResourceLocker {
 
   public async acquire(identifier: ResourceIdentifier): Promise<void> {
     const { path } = identifier;
-    if (!this.locks[path]) {
-      this.locks[path] = [];
-    } else {
+    if (this.locks[path]) {
       return new Promise((resolve): void => {
         this.locks[path].push(resolve);
       });
     }
+    this.locks[path] = [];
   }
 
   public async release(identifier: ResourceIdentifier): Promise<void> {