diff --git a/packages/core/src/helpers/getMarkAttributes.ts b/packages/core/src/helpers/getMarkAttributes.ts
index a8dce181..632fe378 100644
--- a/packages/core/src/helpers/getMarkAttributes.ts
+++ b/packages/core/src/helpers/getMarkAttributes.ts
@@ -5,13 +5,13 @@ import getMarkType from './getMarkType'
 export default function getMarkAttributes(state: EditorState, typeOrName: string | MarkType): Record<string, any> {
   const type = getMarkType(typeOrName, state.schema)
   const { from, to, empty } = state.selection
-  let marks: Mark[] = []
+  const marks: Mark[] = []
 
   if (empty) {
-    marks = state.selection.$head.marks()
+    marks.push(...state.selection.$head.marks())
   } else {
     state.doc.nodesBetween(from, to, node => {
-      marks = [...marks, ...node.marks]
+      marks.push(...node.marks)
     })
   }
 
diff --git a/packages/core/src/helpers/getMarksBetween.ts b/packages/core/src/helpers/getMarksBetween.ts
index f7ba63f5..75373fcf 100644
--- a/packages/core/src/helpers/getMarksBetween.ts
+++ b/packages/core/src/helpers/getMarksBetween.ts
@@ -2,14 +2,14 @@ import { EditorState } from 'prosemirror-state'
 import { MarkRange } from '../types'
 
 export default function getMarksBetween(from: number, to: number, state: EditorState): MarkRange[] {
-  let marks: MarkRange[] = []
+  const marks: MarkRange[] = []
 
   state.doc.nodesBetween(from, to, (node, pos) => {
-    marks = [...marks, ...node.marks.map(mark => ({
+    marks.push(...node.marks.map(mark => ({
       from: pos,
       to: pos + node.nodeSize,
       mark,
-    }))]
+    })))
   })
 
   return marks
diff --git a/packages/core/src/helpers/getNodeAttributes.ts b/packages/core/src/helpers/getNodeAttributes.ts
index e27f8aee..fcd0d9bb 100644
--- a/packages/core/src/helpers/getNodeAttributes.ts
+++ b/packages/core/src/helpers/getNodeAttributes.ts
@@ -5,10 +5,10 @@ import getNodeType from './getNodeType'
 export default function getNodeAttributes(state: EditorState, typeOrName: string | NodeType): Record<string, any> {
   const type = getNodeType(typeOrName, state.schema)
   const { from, to } = state.selection
-  let nodes: Node[] = []
+  const nodes: Node[] = []
 
   state.doc.nodesBetween(from, to, node => {
-    nodes = [...nodes, node]
+    nodes.push(node)
   })
 
   const node = nodes
diff --git a/packages/core/src/helpers/isMarkActive.ts b/packages/core/src/helpers/isMarkActive.ts
index 988e40dc..bfd96a29 100644
--- a/packages/core/src/helpers/isMarkActive.ts
+++ b/packages/core/src/helpers/isMarkActive.ts
@@ -27,7 +27,7 @@ export default function isMarkActive(
   }
 
   let selectionRange = 0
-  let markRanges: MarkRange[] = []
+  const markRanges: MarkRange[] = []
 
   state.doc.nodesBetween(from, to, (node, pos) => {
     if (node.isText || node.marks.length) {
@@ -37,11 +37,11 @@ export default function isMarkActive(
 
       selectionRange += range
 
-      markRanges = [...markRanges, ...node.marks.map(mark => ({
+      markRanges.push(...node.marks.map(mark => ({
         mark,
         from: relativeFrom,
         to: relativeTo,
-      }))]
+      })))
     }
   })
 
diff --git a/packages/core/src/helpers/isNodeActive.ts b/packages/core/src/helpers/isNodeActive.ts
index 2314e862..78cee635 100644
--- a/packages/core/src/helpers/isNodeActive.ts
+++ b/packages/core/src/helpers/isNodeActive.ts
@@ -14,18 +14,18 @@ export default function isNodeActive(
     ? getNodeType(typeOrName, state.schema)
     : null
 
-  let nodeRanges: NodeRange[] = []
+  const nodeRanges: NodeRange[] = []
 
   state.doc.nodesBetween(from, to, (node, pos) => {
     if (!node.isText) {
       const relativeFrom = Math.max(from, pos)
       const relativeTo = Math.min(to, pos + node.nodeSize)
 
-      nodeRanges = [...nodeRanges, {
+      nodeRanges.push({
         node,
         from: relativeFrom,
         to: relativeTo,
-      }]
+      })
     }
   })