planning

node_modules/micromark/lib/util/chunked-splice.mjs

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+export default chunkedSplice
+
+import constants from '../constant/constants.mjs'
+import splice from '../constant/splice.mjs'
+
+// `Array#splice` takes all items to be inserted as individual argument which
+// causes a stack overflow in V8 when trying to insert 100k items for instance.
+function chunkedSplice(list, start, remove, items) {
+  var end = list.length
+  var chunkStart = 0
+  var parameters
+
+  // Make start between zero and `end` (included).
+  if (start < 0) {
+    start = -start > end ? 0 : end + start
+  } else {
+    start = start > end ? end : start
+  }
+
+  remove = remove > 0 ? remove : 0
+
+  // No need to chunk the items if there’s only a couple (10k) items.
+  if (items.length < constants.v8MaxSafeChunkSize) {
+    parameters = Array.from(items)
+    parameters.unshift(start, remove)
+    splice.apply(list, parameters)
+  } else {
+    // Delete `remove` items starting from `start`
+    if (remove) splice.apply(list, [start, remove])
+
+    // Insert the items in chunks to not cause stack overflows.
+    while (chunkStart < items.length) {
+      parameters = items.slice(
+        chunkStart,
+        chunkStart + constants.v8MaxSafeChunkSize
+      )
+      parameters.unshift(start, 0)
+      splice.apply(list, parameters)
+
+      chunkStart += constants.v8MaxSafeChunkSize
+      start += constants.v8MaxSafeChunkSize
+    }
+  }
+}