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app_vue/node_modules/webpack/lib/util/chainedImports.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("../Dependency")} Dependency */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("../ModuleGraph")} ModuleGraph */
+/** @typedef {import("../javascript/JavascriptParser").Range} Range */
+
+/**
+ * @summary Get the subset of ids and their corresponding range in an id chain that should be re-rendered by webpack.
+ * Only those in the chain that are actually referring to namespaces or imports should be re-rendered.
+ * Deeper member accessors on the imported object should not be re-rendered.  If deeper member accessors are re-rendered,
+ * there is a potential loss of meaning with rendering a quoted accessor as an unquoted accessor, or vice versa,
+ * because minifiers treat quoted accessors differently.  e.g. import { a } from "./module"; a["b"] vs a.b
+ * @param {string[]} untrimmedIds chained ids
+ * @param {Range} untrimmedRange range encompassing allIds
+ * @param {Range[] | undefined} ranges cumulative range of ids for each of allIds
+ * @param {ModuleGraph} moduleGraph moduleGraph
+ * @param {Dependency} dependency dependency
+ * @returns {{trimmedIds: string[], trimmedRange: Range}} computed trimmed ids and cumulative range of those ids
+ */
+module.exports.getTrimmedIdsAndRange = (
+	untrimmedIds,
+	untrimmedRange,
+	ranges,
+	moduleGraph,
+	dependency
+) => {
+	let trimmedIds = trimIdsToThoseImported(
+		untrimmedIds,
+		moduleGraph,
+		dependency
+	);
+	let trimmedRange = untrimmedRange;
+	if (trimmedIds.length !== untrimmedIds.length) {
+		// The array returned from dep.idRanges is right-aligned with the array returned from dep.names.
+		// Meaning, the two arrays may not always have the same number of elements, but the last element of
+		// dep.idRanges corresponds to [the expression fragment to the left of] the last element of dep.names.
+		// Use this to find the correct replacement range based on the number of ids that were trimmed.
+		const idx =
+			ranges === undefined
+				? -1 /* trigger failure case below */
+				: ranges.length + (trimmedIds.length - untrimmedIds.length);
+		if (idx < 0 || idx >= /** @type {Range[]} */ (ranges).length) {
+			// cspell:ignore minifiers
+			// Should not happen but we can't throw an error here because of backward compatibility with
+			// external plugins in wp5.  Instead, we just disable trimming for now.  This may break some minifiers.
+			trimmedIds = untrimmedIds;
+			// TODO webpack 6 remove the "trimmedIds = ids" above and uncomment the following line instead.
+			// throw new Error("Missing range starts data for id replacement trimming.");
+		} else {
+			trimmedRange = /** @type {Range[]} */ (ranges)[idx];
+		}
+	}
+
+	return { trimmedIds, trimmedRange };
+};
+
+/**
+ * @summary Determine which IDs in the id chain are actually referring to namespaces or imports,
+ * and which are deeper member accessors on the imported object.
+ * @param {string[]} ids untrimmed ids
+ * @param {ModuleGraph} moduleGraph moduleGraph
+ * @param {Dependency} dependency dependency
+ * @returns {string[]} trimmed ids
+ */
+function trimIdsToThoseImported(ids, moduleGraph, dependency) {
+	/** @type {string[]} */
+	let trimmedIds = [];
+	let currentExportsInfo = moduleGraph.getExportsInfo(
+		/** @type {Module} */ (moduleGraph.getModule(dependency))
+	);
+	for (let i = 0; i < ids.length; i++) {
+		if (i === 0 && ids[i] === "default") {
+			continue; // ExportInfo for the next level under default is still at the root ExportsInfo, so don't advance currentExportsInfo
+		}
+		const exportInfo = currentExportsInfo.getExportInfo(ids[i]);
+		if (exportInfo.provided === false) {
+			// json imports have nested ExportInfo for elements that things that are not actually exported, so check .provided
+			trimmedIds = ids.slice(0, i);
+			break;
+		}
+		const nestedInfo = exportInfo.getNestedExportsInfo();
+		if (!nestedInfo) {
+			// once all nested exports are traversed, the next item is the actual import so stop there
+			trimmedIds = ids.slice(0, i + 1);
+			break;
+		}
+		currentExportsInfo = nestedInfo;
+	}
+	// Never trim to nothing.  This can happen for invalid imports (e.g. import { notThere } from "./module", or import { anything } from "./missingModule")
+	return trimmedIds.length ? trimmedIds : ids;
+}