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node_modules/@11ty/eleventy-img/src/disk-cache.js

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+// const debug = require("debug")("Eleventy:Image");
+
+class DiskCache {
+  #existsCache;
+
+  constructor() {
+    this.hitCounter = 0;
+    this.missCounter = 0;
+    this.inputs = new Map();
+  }
+
+  setExistsCache(existsCache) {
+    this.#existsCache = existsCache;
+  }
+
+  resetCount() {
+    this.hitCounter = 0;
+    this.missCounter = 0;
+  }
+
+  getCount() {
+    return [this.hitCounter, this.missCounter];
+  }
+
+  isCached(targetFile, sourceInput, incrementCounts = true) {
+    if(!this.#existsCache) {
+      throw new Error("Missing `#existsCache`");
+    }
+
+    // Disk cache runs once per output file, so we only increment counts once per input
+    if(this.inputs.has(sourceInput)) {
+      incrementCounts = false;
+    }
+
+    this.inputs.set(sourceInput, true);
+
+    if(this.#existsCache?.exists(targetFile)) {
+      if(incrementCounts) {
+        this.hitCounter++;
+      }
+
+      // debug("Images re-used (via disk cache): %o", this.hitCounter);
+      return true;
+    }
+
+    if(incrementCounts) {
+      this.missCounter++;
+    }
+
+    return false;
+  }
+}
+
+module.exports = DiskCache;