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/*
Author Tobias Koppers @sokra
*/
"use strict";
const { UsageState } = require("../ExportsInfo");
/** @typedef {import("../Dependency").RawReferencedExports} RawReferencedExports */
/** @typedef {import("../ExportsInfo").ExportInfo} ExportInfo */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
/**
* Process export info.
* @param {RuntimeSpec} runtime the runtime
* @param {RawReferencedExports} referencedExports list of referenced exports, will be added to
* @param {string[]} prefix export prefix
* @param {ExportInfo=} exportInfo the export info
* @param {boolean} defaultPointsToSelf when true, using default will reference itself
* @param {Set<ExportInfo>=} alreadyVisited already visited export info (to handle circular reexports)
*/
const processExportInfo = (
runtime,
referencedExports,
prefix,
exportInfo,
defaultPointsToSelf = false,
alreadyVisited = undefined
) => {
if (!exportInfo) {
referencedExports.push(prefix);
return;
}
const used = exportInfo.getUsed(runtime);
if (used === UsageState.Unused) return;
if (alreadyVisited !== undefined && alreadyVisited.has(exportInfo)) {
referencedExports.push(prefix);
return;
}
// Terminal case: not recursing, so no need to track visited here
if (
used !== UsageState.OnlyPropertiesUsed ||
!exportInfo.exportsInfo ||
exportInfo.exportsInfo.otherExportsInfo.getUsed(runtime) !==
UsageState.Unused
) {
referencedExports.push(prefix);
return;
}
// Only the recursive path needs the visited set; allocate it lazily
const visited = alreadyVisited !== undefined ? alreadyVisited : new Set();
visited.add(exportInfo);
const exportsInfo = exportInfo.exportsInfo;
for (const childExportInfo of exportsInfo.orderedExports) {
processExportInfo(
runtime,
referencedExports,
defaultPointsToSelf && childExportInfo.name === "default"
? prefix
: [...prefix, childExportInfo.name],
childExportInfo,
false,
visited
);
}
visited.delete(exportInfo);
};
module.exports = processExportInfo;