@lingui/cli/dist/extract-experimental/buildChunkGraph.js

Lingui CLI to extract messages, compile catalogs, and manage translation workflows

/**
 * Traverse the chunk import graph to determine which entry points depend on each chunk.
 * This lets us extract messages from shared/common chunks once and attribute them to all
 * consuming entry catalogs.
 */
export function buildChunkGraph(rawChunks) {
    const chunkById = new Map(rawChunks.map((c) => [c.id, c]));
    const chunkToEntries = new Map();
    for (const chunk of rawChunks) {
        if (!chunk.entryPoint)
            continue;
        const queue = [chunk.id];
        const visited = new Set();
        while (queue.length > 0) {
            const currentId = queue.pop();
            if (visited.has(currentId))
                continue;
            visited.add(currentId);
            if (!chunkToEntries.has(currentId)) {
                chunkToEntries.set(currentId, new Set());
            }
            chunkToEntries.get(currentId).add(chunk.entryPoint);
            const current = chunkById.get(currentId);
            if (current) {
                for (const imp of current.imports) {
                    if (chunkById.has(imp)) {
                        queue.push(imp);
                    }
                }
            }
        }
    }
    return Array.from(chunkToEntries.entries()).map(([id, entries]) => ({
        filePath: chunkById.get(id).filePath,
        entryPoints: Array.from(entries),
    }));
}