Function print_object_entry_and_merge 

pub fn print_object_entry_and_merge(
    out: &mut String,
    entry: &TsObjectEntry,
    depth: usize,
    map: &mut SourceMapBuilder,
    source_id: usize,
)

print_object_entry’s own sibling (#1477), the TsObjectEntry::Method counterpart to print_class_method_and_merge/print_stmt_and_merge: identical rendering, but merges a Method entry’s own body nested_map into map as it prints, at the real print-time offset. Kept separate from print_object_entry itself so every existing caller’s own call sites are untouched.

Appends to the caller’s own out, the same “must be the real buffer, not a throwaway local one” reasoning print_stmt_and_merge’s own doc explains in full. source_id: see this crate’s own private MergeTarget’s own doc.