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node_modules/html-webpack-plugin/lib/file-watcher-api.js

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+// @ts-check
+/** @typedef {import("webpack/lib/Compilation.js")} WebpackCompilation */
+/** @typedef {import("webpack/lib/FileSystemInfo").Snapshot} Snapshot */
+'use strict';
+
+/**
+ *
+ * @param {{fileDependencies: string[], contextDependencies: string[], missingDependencies: string[]}} fileDependencies
+ * @param {WebpackCompilation} mainCompilation
+ * @param {number} startTime
+ */
+function createSnapshot (fileDependencies, mainCompilation, startTime) {
+  return new Promise((resolve, reject) => {
+    mainCompilation.fileSystemInfo.createSnapshot(
+      startTime,
+      fileDependencies.fileDependencies,
+      fileDependencies.contextDependencies,
+      fileDependencies.missingDependencies,
+      null,
+      (err, snapshot) => {
+        if (err) {
+          return reject(err);
+        }
+        resolve(snapshot);
+      }
+    );
+  });
+}
+
+/**
+ * Returns true if the files inside this snapshot
+ * have not been changed
+ *
+ * @param {Snapshot} snapshot
+ * @param {WebpackCompilation} mainCompilation
+ * @returns {Promise<boolean>}
+ */
+function isSnapShotValid (snapshot, mainCompilation) {
+  return new Promise((resolve, reject) => {
+    mainCompilation.fileSystemInfo.checkSnapshotValid(
+      snapshot,
+      (err, isValid) => {
+        if (err) {
+          reject(err);
+        }
+        resolve(isValid);
+      }
+    );
+  });
+}
+
+/**
+ * Ensure that the files keep watched for changes
+ * and will trigger a recompile
+ *
+ * @param {WebpackCompilation} mainCompilation
+ * @param {{fileDependencies: string[], contextDependencies: string[], missingDependencies: string[]}} fileDependencies
+ */
+function watchFiles (mainCompilation, fileDependencies) {
+  Object.keys(fileDependencies).forEach((depencyTypes) => {
+    fileDependencies[depencyTypes].forEach(fileDependency => {
+      mainCompilation[depencyTypes].add(fileDependency);
+    });
+  });
+}
+
+module.exports = {
+  createSnapshot,
+  isSnapShotValid,
+  watchFiles
+};