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diff/find-diff-start ​

Functions ​

FunctionDescription

findDiffStart

Find the first position at which two fragments differ.

This function performs a deep comparison of two fragments, starting from the beginning and moving forward until it finds the first difference. It compares nodes recursively, checking:

  • Reference equality (same node object)
  • Markup equality (same type and attributes)
  • Text content character-by-character for text nodes
  • Child content recursively for container nodes

The comparison is optimized to skip identical subtrees by checking reference equality first. For text nodes, it performs character-by-character comparison to find the exact position where the text diverges.

Example

typescript
const diff = findDiffStart(oldFragment, newFragment, 0);
if (diff !== null) {
  console.log(`Fragments differ at position ${diff}`);
} else {
  console.log("Fragments are identical");
}