57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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/** @typedef {import("./Resolver").ResolveContext} ResolveContext */
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/**
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* Build the `ResolveContext` passed into the next hook in the chain.
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*
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* The caller — `Resolver.doResolve` — runs on every resolve step, so we
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* want to allocate as little as possible here. Previously the caller
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* constructed a temporary `{ log, yield, fileDependencies, ... }` literal
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* and handed it to this helper, which then copied those same fields into
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* a second fresh object. That's two allocations per step for what is
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* effectively a struct copy with one mutated field (`stack`) and one
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* optionally-wrapped field (`log`). Taking the parent context and the
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* two things we actually want to change (stack, message) as separate
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* arguments lets us allocate exactly one inner context.
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* @param {ResolveContext} parent parent resolve context to inherit dependency sets / yield from
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* @param {ResolveContext["stack"]} stack new stack tip for the nested call
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* @param {null | string} message log message prefix for this step
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* @returns {ResolveContext} inner context
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*/
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module.exports = function createInnerContext(parent, stack, message) {
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const parentLog = parent.log;
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let innerLog;
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if (parentLog) {
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if (message) {
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let messageReported = false;
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/**
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* @param {string} msg message
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*/
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innerLog = (msg) => {
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if (!messageReported) {
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parentLog(message);
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messageReported = true;
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}
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parentLog(` ${msg}`);
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};
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} else {
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innerLog = parentLog;
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}
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}
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return {
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log: innerLog,
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yield: parent.yield,
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fileDependencies: parent.fileDependencies,
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contextDependencies: parent.contextDependencies,
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missingDependencies: parent.missingDependencies,
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stack,
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};
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};
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