fix(chunkify): remove dead whitespace check from merge else-if branch

src/lib/chunkify.test.ts

@@ -136,3 +136,40 @@ test('does not emit a spurious empty chunk when the last byte is covered', () =>
 		chunks: [{ start_offset: 0, end_offset: 4, is_covered: true }],
 	} satisfies ChunkedCoverage)
 })
+
+test('merges adjacent same-coverage chunks separated by whitespace-only gap', () => {
+	// The whitespace-only uncovered chunk between two covered chunks should be
+	// absorbed so the two covered chunks merge into one. This is handled by the
+	// early `continue` at the top of merge(), not the else-if branch.
+	let coverage = {
+		text: 'a{color:red}\n\nb{color:blue}',
+		//           ^12  ^14 — the \n\n gap is whitespace-only
+		ranges: [
+			{ start: 0, end: 12 },
+			{ start: 14, end: 27 },
+		],
+		url: 'https://example.com',
+	}
+	let result = chunkify(coverage)
+	delete coverage.ranges
+	expect(result).toEqual({
+		...coverage,
+		chunks: [{ start_offset: 0, end_offset: 27, is_covered: true }],
+	} satisfies ChunkedCoverage)
+})
+
+test('absorbs a zero-length covered chunk into the surrounding uncovered chunk', () => {
+	// A zero-length range (start === end) produces an empty chunk.
+	// The empty chunk should not appear in the output.
+	let coverage = {
+		text: 'a{color:red}',
+		ranges: [{ start: 5, end: 5 }],
+		url: 'https://example.com',
+	}
+	let result = chunkify(coverage)
+	delete coverage.ranges
+	expect(result).toEqual({
+		...coverage,
+		chunks: [{ start_offset: 0, end_offset: 12, is_covered: false }],
+	} satisfies ChunkedCoverage)
+})

src/lib/chunkify.ts

@@ -33,11 +33,8 @@ function merge(stylesheet: ChunkedCoverage): ChunkedCoverage {
 				previous_chunk = chunk
 				continue
 			}
-			// If the current chunk is only whitespace or empty, add it to the previous
-			else if (
-				WHITESPACE_ONLY_REGEX.test(stylesheet.text.slice(chunk.start_offset, chunk.end_offset)) ||
-				chunk.end_offset === chunk.start_offset
-			) {
+			// If the current chunk is empty (zero-length range), absorb it into the previous
+			else if (chunk.end_offset === chunk.start_offset) {
 				latest_chunk.end_offset = chunk.end_offset
 				// do not update previous_chunk
 				continue