/** @typedef {import("webpack/lib/Compilation.js")} WebpackCompilation */
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/** @typedef {{timestamp: number, fileDependencies: string[]}} Snapshot */
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'use strict';
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/**
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*
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* @param {{fileDependencies: string[], contextDependencies: string[], missingDependencies: string[]}} fileDependencies
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* @param {WebpackCompilation} compilation
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* @param {number} startTime
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*/
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function createSnapshot (fileDependencies, compilation, startTime) {
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const flatDependencies = [];
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Object.keys(fileDependencies).forEach((depencyTypes) => {
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fileDependencies[depencyTypes].forEach(fileDependency => {
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flatDependencies.push(fileDependency);
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});
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});
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return {
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fileDependencies: flatDependencies,
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timestamp: startTime
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};
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}
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/**
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* Returns true if the files inside this snapshot
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* have not been changed
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*
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* @param {Snapshot} snapshot
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* @param {WebpackCompilation} compilation
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* @returns {Promise<boolean>}
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*/
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function isSnapShotValid (snapshot, compilation) {
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// Check if any dependent file was changed after the last compilation
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const fileTimestamps = compilation.fileTimestamps;
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const isCacheOutOfDate = snapshot.fileDependencies.some((fileDependency) => {
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const timestamp = fileTimestamps.get(fileDependency);
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// If the timestamp is not known the file is new
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// If the timestamp is larger then the file has changed
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// Otherwise the file is still the same
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return !timestamp || timestamp > snapshot.timestamp;
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});
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return Promise.resolve(!isCacheOutOfDate);
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}
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/**
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* Ensure that the files keep watched for changes
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* and will trigger a recompile
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*
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* @param {WebpackCompilation} mainCompilation
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* @param {{fileDependencies: string[], contextDependencies: string[], missingDependencies: string[]}} fileDependencies
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*/
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function watchFiles (mainCompilation, fileDependencies) {
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Object.keys(fileDependencies).forEach((depencyTypes) => {
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fileDependencies[depencyTypes].forEach(fileDependency => {
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mainCompilation.compilationDependencies.add(fileDependency);
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});
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});
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}
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module.exports = {
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createSnapshot,
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isSnapShotValid,
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watchFiles
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};
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