Alex Hochheiden
d0470670a1
`third_party/node/node_modules` is generated by `./mach vendor node`. Differential Revision: https://phabricator.services.mozilla.com/D320322
550 lines
22 KiB
JavaScript
550 lines
22 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const Template = require("../Template");
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const HarmonyImportDependency = require("../dependencies/HarmonyImportDependency");
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const HelperRuntimeModule = require("./HelperRuntimeModule");
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/** @typedef {import("../ChunkGraph")} ChunkGraph */
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/** @typedef {import("../Module")} Module */
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/** @typedef {import("../ModuleGraph")} ModuleGraph */
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/** @typedef {import("../Module").RuntimeRequirements} RuntimeRequirements */
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/** @typedef {import("../Module").ExportsType} ExportsType */
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/** @typedef {import("../ChunkGraph").ModuleId} ModuleId */
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/**
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* @typedef {object} DeferredCycleState
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* @property {Map<Module, Set<Module>>} sccOf strongly-connected component per module (shared object per component)
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* @property {Map<Module, Set<Module> | null>} peers memoized SCC peers (component minus the module) per deferred module
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*/
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/** @type {WeakMap<ModuleGraph, DeferredCycleState>} */
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const deferredCycleCache = new WeakMap();
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/**
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* Materializes the active harmony-import targets of a module (deferred edges
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* included, matching the spec's `RequestedModules` recursion).
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* @param {ModuleGraph} moduleGraph the module graph
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* @param {Module} module the module
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* @returns {Module[]} imported modules
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*/
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function harmonyImportTargets(moduleGraph, module) {
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const connections = moduleGraph.getOutgoingConnectionsByModule(module);
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if (!connections) return [];
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/** @type {Module[]} */
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const targets = [];
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for (const [dep, moduleConnections] of connections) {
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if (
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dep &&
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moduleConnections.some(
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(c) =>
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c.dependency instanceof HarmonyImportDependency &&
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c.isTargetActive(undefined)
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)
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) {
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targets.push(dep);
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}
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}
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return targets;
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}
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/**
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* Assigns every module reachable from `seed` (through active harmony imports)
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* to its strongly-connected component via an iterative Tarjan pass, writing the
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* results into `sccOf`. Modules already assigned by an earlier pass are treated
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* as finished, so across all deferred imports every edge is visited once
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* (O(V + E) total) rather than re-walked per import.
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* @param {ModuleGraph} moduleGraph the module graph
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* @param {Module} seed the module to explore from
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* @param {Map<Module, Set<Module>>} sccOf module-to-component map to populate
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* @returns {void}
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*/
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function assignStronglyConnectedComponents(moduleGraph, seed, sccOf) {
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if (sccOf.has(seed)) return;
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/** @type {Map<Module, number>} */
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const index = new Map();
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/** @type {Map<Module, number>} */
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const low = new Map();
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/** @type {Set<Module>} */
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const onStack = new Set();
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/** @type {Module[]} */
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const componentStack = [];
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/** @type {{ node: Module, targets: Module[], i: number }[]} */
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const work = [];
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let counter = 0;
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/**
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* @param {Module} node node to open
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*/
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const open = (node) => {
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index.set(node, counter);
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low.set(node, counter);
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counter++;
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componentStack.push(node);
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onStack.add(node);
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work.push({ node, targets: harmonyImportTargets(moduleGraph, node), i: 0 });
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};
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open(seed);
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while (work.length > 0) {
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const frame = work[work.length - 1];
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if (frame.i < frame.targets.length) {
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const next = frame.targets[frame.i++];
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// Already in a finished component (from this or a prior pass): skip.
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if (sccOf.has(next)) continue;
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if (!index.has(next)) {
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open(next);
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} else if (onStack.has(next)) {
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const nodeLow = /** @type {number} */ (low.get(frame.node));
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const nextIndex = /** @type {number} */ (index.get(next));
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if (nextIndex < nodeLow) low.set(frame.node, nextIndex);
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}
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continue;
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}
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work.pop();
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const node = frame.node;
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const nodeLow = /** @type {number} */ (low.get(node));
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if (work.length > 0) {
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const parent = work[work.length - 1].node;
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if (nodeLow < /** @type {number} */ (low.get(parent))) {
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low.set(parent, nodeLow);
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}
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}
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if (nodeLow === index.get(node)) {
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/** @type {Set<Module>} */
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const component = new Set();
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let member;
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do {
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member = /** @type {Module} */ (componentStack.pop());
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onStack.delete(member);
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component.add(member);
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} while (member !== node);
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for (const m of component) sccOf.set(m, component);
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}
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}
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}
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/**
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* Per the TC39 import-defer spec's `ReadyForSyncExecution`, forcing evaluation
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* of a deferred module must throw when any module in its transitive static
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* import closure is currently evaluating. Only a module in `module`'s own
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* strongly-connected component can be evaluating at that point (anything else it
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* imports is either already evaluated or not started), so we emit just the SCC
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* peers instead of the whole (potentially huge) forward closure.
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* @param {ModuleGraph} moduleGraph the module graph
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* @param {Module} module the deferred module
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* @returns {Set<Module> | null} the SCC peers when cyclic, otherwise null
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*/
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function getDeferredCycleModules(moduleGraph, module) {
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let state = deferredCycleCache.get(moduleGraph);
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if (state === undefined) {
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state = { sccOf: new Map(), peers: new Map() };
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deferredCycleCache.set(moduleGraph, state);
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}
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const cached = state.peers.get(module);
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if (cached !== undefined) return cached;
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assignStronglyConnectedComponents(moduleGraph, module, state.sccOf);
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const component = state.sccOf.get(module);
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// A trivial component (size 1, no self-cycle peers) means no cycle; a direct
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// self-loop is already covered by the `evaluating` check on `module` itself.
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let result = null;
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if (component !== undefined && component.size > 1) {
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result = new Set(component);
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result.delete(module);
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}
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state.peers.set(module, result);
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return result;
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}
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/**
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* Maps a defer-cycle closure to the runtime module ids whose `evaluating` flag
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* the deferred namespace must check. `resolveId` maps a closure module to the
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* runtime id that carries its evaluation state (its own id, or the id of the
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* concatenated module that absorbed it); unresolved (`null`) members are
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* dropped. Returns `null` when there is nothing to check.
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* @param {Set<Module> | null} closure closure modules, or null when not cyclic
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* @param {(module: Module) => ModuleId | null} resolveId maps a module to its runtime id
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* @returns {ModuleId[] | null} deduplicated runtime ids, or null
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*/
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function getDeferredCycleModuleIds(closure, resolveId) {
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if (closure === null) return null;
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/** @type {Set<ModuleId>} */
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const ids = new Set();
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for (const module of closure) {
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const id = resolveId(module);
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if (id !== null) ids.add(id);
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}
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return ids.size > 0 ? [...ids] : null;
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}
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/**
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* @param {ExportsType} exportsType exports type
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* @returns {string} mode
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*/
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function getMakeDeferredNamespaceModeFromExportsType(exportsType) {
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// number is from createFakeNamespaceObject mode ^ 1
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if (exportsType === "namespace") return `/* ${exportsType} */ 8`;
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if (exportsType === "default-only") return `/* ${exportsType} */ 0`;
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if (exportsType === "default-with-named") return `/* ${exportsType} */ 2`;
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if (exportsType === "dynamic") return `/* ${exportsType} */ 6`;
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throw new Error(`Unknown exports type: ${exportsType}`);
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}
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/**
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* @param {string} moduleId moduleId
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* @param {ExportsType} exportsType exportsType
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* @param {(ModuleId | null)[]} asyncDepsIds asyncDepsIds
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* @param {ModuleId[] | null} syncCycleDepsIds transitive static closure ids when the module is part of a defer cycle
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* @param {RuntimeRequirements} runtimeRequirements runtime requirements
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* @returns {string} call make optimized deferred namespace object
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*/
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function getOptimizedDeferredModule(
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moduleId,
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exportsType,
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asyncDepsIds,
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syncCycleDepsIds,
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runtimeRequirements
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) {
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runtimeRequirements.add(RuntimeGlobals.makeOptimizedDeferredNamespaceObject);
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const mode = getMakeDeferredNamespaceModeFromExportsType(exportsType);
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const asyncDeps = asyncDepsIds.filter((x) => x !== null);
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const hasSync = syncCycleDepsIds !== null && syncCycleDepsIds.length > 0;
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// `syncDeps` is passed positionally after `asyncDeps`, so a `0` placeholder
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// keeps the slot when the module has cycle deps but no async deps.
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const args = [moduleId, mode];
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if (asyncDeps.length > 0 || hasSync) {
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args.push(asyncDeps.length > 0 ? JSON.stringify(asyncDeps) : "0");
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}
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if (hasSync) args.push(JSON.stringify(syncCycleDepsIds));
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return `${RuntimeGlobals.makeOptimizedDeferredNamespaceObject}(${args.join(
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", "
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)})`;
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}
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class MakeOptimizedDeferredNamespaceObjectRuntimeModule extends HelperRuntimeModule {
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/**
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* @param {boolean} hasAsyncRuntime if async module is used.
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*/
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constructor(hasAsyncRuntime) {
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super("make optimized deferred namespace object");
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/** @type {boolean} */
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this.hasAsyncRuntime = hasAsyncRuntime;
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}
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/**
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* Generates runtime code for this runtime module.
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* @returns {string | null} runtime code
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*/
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generate() {
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if (!this.compilation) return null;
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const { runtimeTemplate } = this.compilation;
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const cst = runtimeTemplate.renderConst();
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const lt = runtimeTemplate.renderLet();
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const fn = RuntimeGlobals.makeOptimizedDeferredNamespaceObject;
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const hasAsync = this.hasAsyncRuntime;
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return Template.asString([
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// Note: must be a function (not arrow), because this is used in body!
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// `asyncDeps` keeps a fixed positional slot even without async runtime
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// so the trailing `syncDeps` (defer-cycle closure) always lines up.
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`${fn} = function(moduleId, mode, asyncDeps, syncDeps) {`,
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Template.indent([
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`${cst} r = this;`,
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hasAsync ? `${cst} isAsync = asyncDeps && asyncDeps.length;` : "",
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`${cst} obj = {`,
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Template.indent([
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"get a() {",
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Template.indent([
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// Forcing evaluation of a module that is currently evaluating
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// (a cycle reached through a deferred import) must throw rather
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// than expose its partial exports. `syncDeps` (present only for
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// cyclic deferred modules) carries the transitive static closure,
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// so an evaluating dependency is caught before any evaluation.
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`${cst} cachedModule = __webpack_module_cache__[moduleId];`,
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'if (cachedModule !== undefined && (cachedModule.evaluating || cachedModule.evaluatingAsync)) throw new TypeError("Cannot access a deferred module namespace while the module is being evaluated");',
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"if (syncDeps) for (var i = 0; i < syncDeps.length; i++) {",
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Template.indent([
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`${cst} depModule = __webpack_module_cache__[syncDeps[i]];`,
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'if (depModule !== undefined && (depModule.evaluating || depModule.evaluatingAsync)) throw new TypeError("Cannot access a deferred module namespace while a dependency is being evaluated");'
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]),
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"}",
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`${lt} exports = r(moduleId);`,
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hasAsync
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? `if(isAsync) exports = exports[${RuntimeGlobals.asyncModuleExportSymbol}];`
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: "",
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// if exportsType is "namespace" we can generate the most optimized code,
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// on the second access, we can avoid trigger the getter.
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// we can also do this if exportsType is "dynamic" and there is a "__esModule" property on it.
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'if(mode & 8 || (mode & 4 && exports.__esModule)) Object.defineProperty(this, "a", { value: exports });',
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"return exports;"
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]),
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"}"
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]),
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"};",
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hasAsync
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? `if(isAsync) obj[${RuntimeGlobals.deferredModuleAsyncTransitiveDependenciesSymbol}] = asyncDeps;`
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: "",
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"return obj;"
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]),
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"};"
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]);
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}
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}
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class MakeDeferredNamespaceObjectRuntimeModule extends HelperRuntimeModule {
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/**
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* @param {boolean} hasAsyncRuntime if async module is used.
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*/
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constructor(hasAsyncRuntime) {
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super("make deferred namespace object");
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/** @type {boolean} */
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this.hasAsyncRuntime = hasAsyncRuntime;
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}
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/**
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* Generates runtime code for this runtime module.
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* @returns {string | null} runtime code
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*/
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generate() {
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if (!this.compilation) return null;
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const { runtimeTemplate } = this.compilation;
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const cst = runtimeTemplate.renderConst();
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const lt = runtimeTemplate.renderLet();
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const fn = RuntimeGlobals.makeDeferredNamespaceObject;
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const hasAsync = this.hasAsyncRuntime;
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const init = `${runtimeTemplate.optionalChaining("init", "()")};`;
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return `${fn} = ${runtimeTemplate.basicFunction("moduleId, mode", [
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// Per the TC39 import-defer spec, deferred namespaces are
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// distinct from their eager counterparts and the same module
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// referenced from multiple defer-import sites must yield the
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// same object. Cache the Proxy / fake namespace per-moduleId so
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// repeated calls (including across files) share identity.
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//
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// Bit 16 (`createFakeNamespaceObject`'s "return value when
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// it's Promise-like" flag added by
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// `RuntimeTemplate.moduleNamespacePromise` for dynamic
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// imports) is irrelevant for deferred namespaces — the value
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// passed into `createFakeNamespaceObject` here is always the
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// resolved module exports (after unwrapping the async-module
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// export symbol when present), never a Promise. Strip it
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// once so all downstream behavior, the cache key, and the
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// `createFakeNamespaceObject` call below see the same shape
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// mode. This keeps static defer (mode 8) and dynamic
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// `await import.defer` (mode 8 | 16) sharing the same
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// Deferred Module Namespace object, while still keying by
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// `(moduleId, mode)` so distinct exports-type shapes
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// (e.g. one importer treats a CJS module as
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// "default-with-named", another as "namespace") get
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// distinct cache entries.
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"mode &= ~16;",
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`${lt} byMode = __webpack_module_deferred_namespace_cache__[moduleId];`,
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"if (byMode && byMode[mode] !== undefined) return byMode[mode];",
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"if (!byMode) byMode = __webpack_module_deferred_namespace_cache__[moduleId] = {};",
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`${cst} cachedModule = __webpack_module_cache__[moduleId];`,
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"if (cachedModule && cachedModule.error === undefined && !(mode & 8)) {",
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Template.indent([
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`${lt} exports = cachedModule.exports;`,
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hasAsync
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? `if (${RuntimeGlobals.asyncModuleExportSymbol} in exports) exports = exports[${RuntimeGlobals.asyncModuleExportSymbol}];`
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: "",
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`return byMode[mode] = ${RuntimeGlobals.createFakeNamespaceObject}(exports, mode);`
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]),
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"}",
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"",
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`${lt} init = ${runtimeTemplate.basicFunction("", [
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// A deferred namespace that forces evaluation of a module that is
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// already evaluating (a cycle) must throw rather than expose its
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// partial exports.
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`${cst} evaluatingModule = __webpack_module_cache__[moduleId];`,
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'if (evaluatingModule !== undefined && (evaluatingModule.evaluating || evaluatingModule.evaluatingAsync)) throw new TypeError("Cannot access a deferred module namespace while the module is being evaluated");',
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`ns = ${RuntimeGlobals.require}(moduleId);`,
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hasAsync
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? `if (${RuntimeGlobals.asyncModuleExportSymbol} in ns) ns = ns[${RuntimeGlobals.asyncModuleExportSymbol}];`
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: "",
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"init = null;",
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"if (mode & 8 || mode & 4 && ns.__esModule && typeof ns === 'object') {",
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Template.indent([
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// Drop only the read-side traps after init: with the
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// resolved namespace's own keys mirrored onto
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// `ns_target` below, the default `Reflect` behavior
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// returns the right values via the live-binding
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// getters, so we no longer need to intercept `get` /
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// `has` / `ownKeys` / `getOwnPropertyDescriptor`.
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//
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// The mutation traps (`set`, `deleteProperty`,
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// `defineProperty`) are kept because per the TC39
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// import-defer spec, `[[Set]]` / `[[Delete]]` /
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// `[[DefineOwnProperty]]` on a Deferred Module
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// Namespace Exotic Object never succeed — and the
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// proxy target itself remains extensible
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// (architecturally we cannot freeze it up-front),
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// so without these traps `ns.notExported = "x"`
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// after evaluation would silently create a property
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// on the target instead of returning false.
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"delete handler.get;",
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"delete handler.has;",
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"delete handler.ownKeys;",
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"delete handler.getOwnPropertyDescriptor;"
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]),
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"} else {",
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Template.indent([
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`ns = ${RuntimeGlobals.createFakeNamespaceObject}(ns, mode);`
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]),
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"}",
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// Mirror own properties from the resolved namespace onto the proxy
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// target so that proxy invariants hold for callers that structurally
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// introspect via `Object.keys` / `Object.getOwnPropertyNames` /
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// `Object.getOwnPropertyDescriptor`: when our trap reports a
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// non-configurable descriptor for a key, the target must also have
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// that key with a matching descriptor.
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//
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// `__esModule` and `Symbol.toStringTag` are intentionally skipped:
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// the proxy synthesizes "Deferred Module" / true regardless of what
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// the underlying namespace exposes (per the TC39 import-defer
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// proposal, the [[StringTag]] of a Deferred Module Namespace
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// Exotic Object is "Deferred Module"), and the target was already
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// pre-populated with those values below.
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`${cst} keys = Reflect.ownKeys(ns);`,
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"for (var i = 0; i < keys.length; i++) {",
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Template.indent([
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`${cst} k = keys[i];`,
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'if (k === "__esModule" || k === Symbol.toStringTag) continue;',
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`if (!${runtimeTemplate.objectHasOwn("ns_target", "k")}) {`,
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Template.indent([
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"try { Object.defineProperty(ns_target, k, Reflect.getOwnPropertyDescriptor(ns, k)); } catch (_) {}"
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]),
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"}"
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]),
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"}"
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])};`,
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"",
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// The proxy target is a fresh placeholder, separate from
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// `__webpack_module_deferred_exports__[moduleId]` (which is reused
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// by `__webpack_require__` as `module.exports` for deferred-loaded
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// modules and would conflict with our pre-populated synthetic
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// `__esModule` / `Symbol.toStringTag` non-configurable properties).
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// Using a dedicated target keeps the proxy invariant-compliant
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// without interfering with the module's own exports object.
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`${cst} ns_target = { __proto__: null };`,
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// Pre-populate the synthetic deferred-namespace properties with
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// fully non-configurable, non-writable, non-enumerable descriptors
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// (matching the TC39 import-defer spec for Module Namespace
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// Exotic Objects). The trap returns the same descriptors below.
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'Object.defineProperty(ns_target, "__esModule", { value: true });',
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'Object.defineProperty(ns_target, Symbol.toStringTag, { value: "Deferred Module" });',
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`${lt} ns = ns_target;`,
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`${cst} handler = {`,
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Template.indent([
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"__proto__: null,",
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// Per the TC39 import-defer proposal, `IsSymbolLikeNamespaceKey`
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// returns true for any Symbol-keyed access (and for "then"); such
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// accesses go through `OrdinaryGetOwnProperty` and must not
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|
// trigger evaluation of the deferred module. The Symbol checks
|
|
// below short-circuit to the pre-populated target without
|
|
// running `init()`.
|
|
`${runtimeTemplate.method("get", "_, name", [
|
|
"switch (name) {",
|
|
Template.indent([
|
|
'case "__esModule": return true;',
|
|
'case Symbol.toStringTag: return "Deferred Module";',
|
|
'case "then": return undefined;'
|
|
]),
|
|
"}",
|
|
'if (typeof name === "symbol") return ns_target[name];',
|
|
init,
|
|
"return ns[name];"
|
|
])},`,
|
|
`${runtimeTemplate.method("has", "_, name", [
|
|
"switch (name) {",
|
|
Template.indent(
|
|
[
|
|
'case "__esModule":',
|
|
"case Symbol.toStringTag:",
|
|
hasAsync
|
|
? `case ${RuntimeGlobals.deferredModuleAsyncTransitiveDependenciesSymbol}:`
|
|
: "",
|
|
Template.indent("return true;"),
|
|
'case "then":',
|
|
Template.indent("return false;")
|
|
].filter(Boolean)
|
|
),
|
|
"}",
|
|
'if (typeof name === "symbol") return name in ns_target;',
|
|
init,
|
|
"return name in ns;"
|
|
])},`,
|
|
`${runtimeTemplate.method("ownKeys", "", [
|
|
init,
|
|
`${cst} filtered = Reflect.ownKeys(ns).filter(${runtimeTemplate.expressionFunction(
|
|
'x !== "then" && x !== Symbol.toStringTag',
|
|
"x"
|
|
)});`,
|
|
`${cst} keys = ${
|
|
runtimeTemplate.supportsSpread()
|
|
? "[...filtered, Symbol.toStringTag]"
|
|
: "filtered.concat([Symbol.toStringTag])"
|
|
};`,
|
|
"return keys;"
|
|
])},`,
|
|
`${runtimeTemplate.method("getOwnPropertyDescriptor", "_, name", [
|
|
"switch (name) {",
|
|
Template.indent([
|
|
// Match the descriptors actually defined on `ns_target`
|
|
// (non-configurable, non-writable, non-enumerable) so the
|
|
// proxy invariant holds for both the trap result and any
|
|
// post-init forwarding via the deleted-handler path.
|
|
'case "__esModule": return { value: true, writable: false, enumerable: false, configurable: false };',
|
|
'case Symbol.toStringTag: return { value: "Deferred Module", writable: false, enumerable: false, configurable: false };',
|
|
'case "then": return undefined;'
|
|
]),
|
|
"}",
|
|
'if (typeof name === "symbol") return Reflect.getOwnPropertyDescriptor(ns_target, name);',
|
|
init,
|
|
`${lt} desc = Reflect.getOwnPropertyDescriptor(ns, name);`,
|
|
'if (mode & 2 && name == "default" && !desc) {',
|
|
Template.indent("desc = { value: ns, configurable: true };"),
|
|
"}",
|
|
"return desc;"
|
|
])},`,
|
|
// `defineProperty` always rejects, but per the TC39 spec it
|
|
// must still trigger evaluation for string keys (the spec
|
|
// algorithm calls `[[GetOwnProperty]]` first, which forces
|
|
// evaluation on a deferred namespace). Symbol keys go through
|
|
// OrdinaryDefineOwnProperty and do not trigger eval.
|
|
`${runtimeTemplate.method("defineProperty", "_, name", [
|
|
'if (typeof name === "symbol" || name === "then") return false;',
|
|
init,
|
|
"return false;"
|
|
])},`,
|
|
// `deleteProperty` rejects, but per the TC39 spec it must
|
|
// still trigger evaluation for string keys (the spec
|
|
// algorithm calls `GetModuleExportsList` for non-symbol-like
|
|
// keys, forcing evaluation on a deferred namespace).
|
|
`${runtimeTemplate.method("deleteProperty", "_, name", [
|
|
'if (typeof name === "symbol" || name === "then") return false;',
|
|
init,
|
|
"return false;"
|
|
])},`,
|
|
// `set` always returns false without triggering evaluation —
|
|
// the spec [[Set]] algorithm for Module Namespaces is just
|
|
// "return false" (no [[GetOwnProperty]], no eval).
|
|
`set: ${runtimeTemplate.returningFunction("false")},`
|
|
]),
|
|
"}",
|
|
// we don't fully emulate ES Module semantics in this Proxy to align with normal webpack esm namespace object.
|
|
"return byMode[mode] = new Proxy(ns_target, handler);"
|
|
])};`;
|
|
}
|
|
}
|
|
|
|
module.exports.MakeDeferredNamespaceObjectRuntimeModule =
|
|
MakeDeferredNamespaceObjectRuntimeModule;
|
|
module.exports.MakeOptimizedDeferredNamespaceObjectRuntimeModule =
|
|
MakeOptimizedDeferredNamespaceObjectRuntimeModule;
|
|
module.exports.getDeferredCycleModuleIds = getDeferredCycleModuleIds;
|
|
module.exports.getDeferredCycleModules = getDeferredCycleModules;
|
|
module.exports.getMakeDeferredNamespaceModeFromExportsType =
|
|
getMakeDeferredNamespaceModeFromExportsType;
|
|
module.exports.getOptimizedDeferredModule = getOptimizedDeferredModule;
|