Fix --cache set only if with --write or no-different

src/cli/format-results-cache.js

@@ -40,7 +40,7 @@ function getMetadataFromFileDescriptor(fileDescriptor) {
 
 class FormatResultsCache {
   /**
-   * @param {string} cacheFileLocation The path of cache file location. (default: `node_modules/.cache/prettier/prettier-cache`)
+   * @param {string} cacheFileLocation The path of cache file location. (default: `node_modules/.cache/prettier/.prettier-cache`)
    * @param {string} cacheStrategy
    */
   constructor(cacheFileLocation, cacheStrategy) {
@@ -60,20 +60,17 @@ class FormatResultsCache {
    */
   existsAvailableFormatResultsCache(filePath, options) {
     const fileDescriptor = this.fileEntryCache.getFileDescriptor(filePath);
-    const hashOfOptions = getHashOfOptions(options);
-    const meta = getMetadataFromFileDescriptor(fileDescriptor);
-    const changed =
-      fileDescriptor.changed || meta.hashOfOptions !== hashOfOptions;
 
     if (fileDescriptor.notFound) {
       return false;
     }
 
-    if (changed) {
-      return false;
-    }
+    const hashOfOptions = getHashOfOptions(options);
+    const meta = getMetadataFromFileDescriptor(fileDescriptor);
+    const changed =
+      fileDescriptor.changed || meta.hashOfOptions !== hashOfOptions;
 
-    return true;
+    return !changed;
   }
 
   /**
@@ -88,6 +85,13 @@ class FormatResultsCache {
     }
   }
 
+  /**
+   * @param {string} filePath
+   */
+  removeFormatResultsCache(filePath) {
+    this.fileEntryCache.removeEntry(filePath);
+  }
+
   reconcile() {
     this.fileEntryCache.reconcile();
   }

src/cli/format.js

@@ -407,9 +407,8 @@ async function formatFiles(context) {
       continue;
     }
 
-    formatResultsCache?.setFormatResultsCache(filename, options);
-
     const isDifferent = output !== input;
+    let shouldSetCache = !isDifferent;
 
     if (printedFilename) {
       // Remove previously printed filename to log it with duration.
@@ -433,14 +432,15 @@ async function formatFiles(context) {
 
         try {
           await fs.writeFile(filename, output, "utf8");
+
+          // Set cache if format succeeds
+          shouldSetCache = true;
         } catch (error) {
-          /* istanbul ignore next */
           context.logger.error(
             `Unable to write file: ${filename}\n${error.message}`
           );
 
           // Don't exit the process if one file failed
-          /* istanbul ignore next */
           process.exitCode = 2;
         }
       } else if (!context.argv.check && !context.argv.listDifferent) {
@@ -462,6 +462,12 @@ async function formatFiles(context) {
       writeOutput(context, result, options);
     }
 
+    if (shouldSetCache) {
+      formatResultsCache?.setFormatResultsCache(filename, options);
+    } else {
+      formatResultsCache?.removeFormatResultsCache(filename);
+    }
+
     if (isDifferent) {
       if (context.argv.check) {
         context.logger.warn(filename);