countries-map.vue and research-map.vue share 1,756 lines across 60
contiguous blocks, and 78% of that is one concern: the wiring between a
semantic-tree legend and the map beside it. The two files already import
the same 41 library modules and the same five legend-data composables, so
the data layer was never the duplication. The glue was, and glue is where
a fix lands in one copy and not the other: the packet kind-split, the
poster attribution reading and the packet page-1 map hand-off each shipped
fixed in one twin and broken in the other.
Only the four functions that are BYTE-IDENTICAL in both files move:
clearCountryHighlight, _flatItemsToStlNodes, onLegendRowClick and
_bridgeSelection. Measured, not assumed — applyDimFilter (185 lines against
170) and switchTab (49 against 50) genuinely differ and stay where they
are. Sharing code that merely looks similar is how a refactor picks one
plugin's behaviour for both.
A composable rather than a component: the legend markup already lives in
SemanticTreeLegend and its two shells, and a component would have forced
both plugins to give up the template where their real differences live.
Nothing is injected or reached for, so a second dashboard can adopt it
without inheriting research-map's provide tree.
Both calls sit after countryOutline and pplrInstance. The declarations they
replace were hoisted and ran above those consts; a composable call is not
hoisted, and placed too early it would read undefined at the first call
rather than at import — the legend would stop highlighting with no error.
The gate asserts both the dependency list and that ordering, for every
caller.
Rebuild-and-compare on both bundles: research-map 1,237,385 -> 1,237,709
bytes, country-posters 1,550,988 -> 1,551,317, and every behaviour-bearing
token identical in both — regions-fill, regions-border, fill-opacity,
fill-outline-color, line-color, line-width, visibility,
doxa:legend-row-click, _flat_filter, iso_3166_1_alpha_3. Counted rather
than set-compared, because minified output renames freely.
104 lines out of the plugins, shared lines 1,756 -> 1,702.
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