diff --git a/packages/associative/src/hash-map.ts b/packages/associative/src/hash-map.ts
index 03c6c9ae38..cc52d2d9cc 100644
--- a/packages/associative/src/hash-map.ts
+++ b/packages/associative/src/hash-map.ts
@@ -119,8 +119,8 @@ export class HashMap<K, V>
      * readonly/immutable. This could be enforced via TS, but would
      * break ES6 Map interface contract.
      *
-     * @param fn - 
-     * @param thisArg - 
+     * @param fn -
+     * @param thisArg -
      */
     forEach(fn: Fn3<V, K, Map<K, V>, void>, thisArg?: any) {
         for (let pair of __private.get(this)!.bins) {
@@ -142,7 +142,7 @@ export class HashMap<K, V>
     copy() {
         const $this = __private.get(this)!;
         const m = new HashMap<K, V>(null, this.opts({ cap: 4 }));
-        Object.assign(__private.get(m), {
+        Object.assign(__private.get(m)!, {
             bins: $this.bins.slice(),
             mask: $this.mask,
             size: $this.size,
diff --git a/packages/parse/src/xform/hoist.ts b/packages/parse/src/xform/hoist.ts
index bbbb99c7ab..d078fccf5f 100644
--- a/packages/parse/src/xform/hoist.ts
+++ b/packages/parse/src/xform/hoist.ts
@@ -4,10 +4,10 @@ import { xform } from "../combinators/xform.js";
 /**
  * Replace AST node with its first child node. Also see {@link hoist}.
  *
- * @param scope - 
+ * @param scope -
  */
 export const xfHoist: ScopeTransform<any> = (scope) => {
-    Object.assign(scope, scope!.children![0]);
+    Object.assign(scope!, scope!.children![0]);
     return scope;
 };
 
@@ -15,7 +15,7 @@ export const xfHoist: ScopeTransform<any> = (scope) => {
  * Moves the result of first child node to this node, then discards all
  * children. Also see {@link hoistR}.
  *
- * @param scope - 
+ * @param scope -
  */
 export const xfHoistResult: ScopeTransform<any> = (scope) => {
     scope!.result = scope!.children![0].result;
@@ -26,14 +26,14 @@ export const xfHoistResult: ScopeTransform<any> = (scope) => {
 /**
  * Syntax sugar for `xform(parser, xfHoist)`.
  *
- * @param parser - 
+ * @param parser -
  */
 export const hoist = <T>(parser: Parser<T>) => xform(parser, xfHoist);
 
 /**
  * Syntax sugar for `xform(parser, xfHoistR)`.
  *
- * @param parser - 
+ * @param parser -
  */
 export const hoistResult = <T>(parser: Parser<T>) =>
     xform(parser, xfHoistResult);
diff --git a/packages/rstream/src/object.ts b/packages/rstream/src/object.ts
index 45e5c4923c..49d31161e5 100644
--- a/packages/rstream/src/object.ts
+++ b/packages/rstream/src/object.ts
@@ -20,7 +20,7 @@ export interface StreamObj<T, K extends Keys<T>> {
      * Feeds new values from `x` to each registered key's stream.
      * Satifies {@link ISubscriber.next} interface.
      *
-     * @param x - 
+     * @param x -
      */
     next(x: T): void;
     /**
@@ -126,8 +126,8 @@ export interface StreamObjOpts<T, K extends Keys<T>> extends CommonOpts {
  * // b foo
  * ```
  *
- * @param src - 
- * @param opts - 
+ * @param src -
+ * @param opts -
  */
 export const fromObject = <T, K extends Keys<T>>(
     src: T,
@@ -146,7 +146,7 @@ export const fromObject = <T, K extends Keys<T>>(
     for (let k of keys) {
         streams[k] = subscription(undefined, {
             ..._opts,
-            id: `${id}-${k}`,
+            id: `${id}-${String(k)}`,
         });
     }
     const res = <StreamObj<T, K>>{
diff --git a/packages/system/src/system.ts b/packages/system/src/system.ts
index 5b0d57fda9..cf670ccb45 100644
--- a/packages/system/src/system.ts
+++ b/packages/system/src/system.ts
@@ -37,7 +37,7 @@ export class System<T extends SystemMap<T>> implements ILifecycle {
         for (let id of this.topology) {
             const comp = this.components[id];
             if (comp.start && !(await comp.start())) {
-                LOGGER.warn(`error starting component: ${id}`);
+                LOGGER.warn(`error starting component: ${String(id)}`);
                 return false;
             }
         }
@@ -59,7 +59,7 @@ export class System<T extends SystemMap<T>> implements ILifecycle {
             const id = topo[i];
             const comp = this.components[id];
             if (comp.stop && !(await comp.stop())) {
-                LOGGER.warn(`error stopping component: ${id}`);
+                LOGGER.warn(`error stopping component: ${String(id)}`);
             }
         }
         return true;