Developer Tools
vsourcemap
Loads a build’s source map and tells you where each function came from.
Released v1.0.0 · 2026-09-28use "stdlib/sourcemap.ven"Loads and queries the per function source map that the compiler's own build command can write out, letting a tool look up which original source line a piece of compiled output came from. It reads and searches an existing, real source map file rather than generating a new mapping format.
print load_source_map("build/app.map.json")Reference (7 functions)
API reference
load_source_map(path)
load_source_map("build/app.map.json")source_map_entries(map)
Gives back a loaded source map's flat list of per-instruction entries.
source_map_entries(load_source_map("build/app.map.json"))source_map_root(map)
Gives back a loaded source map's root file path.
source_map_root(load_source_map("build/app.map.json"))function_entries(map, function_name)
Filters a source map down to the entries belonging to one function.
function_entries(load_source_map("build/app.map.json"), "add")function_source_file(map, function_name)
Gives back the one file a named function's declaration came from.
function_source_file(load_source_map("build/app.map.json"), "add")resolve_pc(map, function_name, pc)
Resolves a (function, program-counter) pair to its source line.
resolve_pc(load_source_map("build/app.map.json"), "add", 2)nearest_entry(map, function_name, target_line)
Finds the entry in one function whose line is closest to a target line.
nearest_entry(load_source_map("build/app.map.json"), "sub", 6)