Function getProperty

lib/dependencies/ExportsInfoDependency.js:38–90

(moduleGraph, module, exportName_, property, runtime)

 * @returns {undefined | null | boolean | ExportInfoName[]} value of the property
 */
const getProperty = (moduleGraph, module, exportName_, property, runtime) => {
	if (!exportName_) {
		switch (property) {
			case "usedExports": {
				const usedExports = moduleGraph
					.getExportsInfo(module)
					.getUsedExports(runtime);
				if (
					typeof usedExports === "boolean" ||
					usedExports === undefined ||
					usedExports === null
				) {
					return usedExports;
				}
				return [...usedExports].sort();
			}
		}
	}
	const exportName = /** @type {ExportInfoName[]} */ (exportName_);
	switch (property) {
		case "canMangle": {
			const exportsInfo = moduleGraph.getExportsInfo(module);
			const exportInfo = exportsInfo.getReadOnlyExportInfoRecursive(exportName);
			if (exportInfo) return exportInfo.canMangle;
			return exportsInfo.otherExportsInfo.canMangle;
		}
		case "used":
			return (
				moduleGraph.getExportsInfo(module).getUsed(exportName, runtime) !==
				UsageState.Unused
			);
		case "useInfo": {
			const state = moduleGraph
				.getExportsInfo(module)
				.getUsed(exportName, runtime);
			switch (state) {
				case UsageState.Used:
				case UsageState.OnlyPropertiesUsed:
					return true;
				case UsageState.Unused:
					return false;
				case UsageState.NoInfo:
					return;
				case UsageState.Unknown:
					return null;
				default:
					throw new Error(`Unexpected UsageState ${state}`);
			}
		}
		case "provideInfo":
			return moduleGraph.getExportsInfo(module).isExportProvided(exportName);
	}
};

class ExportsInfoDependency extends NullDependency {
	/**