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node_modules/next/dist/esm/lib/multi-file-writer.js

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+import path from '../shared/lib/isomorphic/path';
+/**
+ * MultiFileWriter is a utility for writing multiple files in parallel that
+ * guarantees that all files will be written after their containing directory
+ * is created, and that the directory will only be created once.
+ */ export class MultiFileWriter {
+    constructor(/**
+     * The file system methods to use.
+     */ fs){
+        this.fs = fs;
+        this.tasks = [];
+    }
+    /**
+   * Finds or creates a task for a directory.
+   *
+   * @param directory - The directory to find or create a task for.
+   * @returns The task for the directory.
+   */ findOrCreateTask(directory) {
+        // See if this directory already has a task to create it.
+        for (const task of this.tasks){
+            if (task[0] === directory) {
+                return task;
+            }
+        }
+        const promise = this.fs.mkdir(directory);
+        // Attach a catch handler so that it doesn't throw an unhandled promise
+        // rejection warning.
+        promise.catch(()=>{});
+        // Otherwise, create a new task for this directory.
+        const task = [
+            directory,
+            promise,
+            []
+        ];
+        this.tasks.push(task);
+        return task;
+    }
+    /**
+   * Appends a file to the writer to be written after its containing directory
+   * is created. The file writer should be awaited after all the files have been
+   * appended. Any async operation that occurs between appending and awaiting
+   * may cause an unhandled promise rejection warning and potentially crash the
+   * process.
+   *
+   * @param filePath - The path to the file to write.
+   * @param data - The data to write to the file.
+   */ append(filePath, data) {
+        // Find or create a task for the directory that contains the file.
+        const task = this.findOrCreateTask(path.dirname(filePath));
+        const promise = task[1].then(()=>this.fs.writeFile(filePath, data));
+        // Attach a catch handler so that it doesn't throw an unhandled promise
+        // rejection warning.
+        promise.catch(()=>{});
+        // Add the file write to the task AFTER the directory promise has resolved.
+        task[2].push(promise);
+    }
+    /**
+   * Returns a promise that resolves when all the files have been written.
+   */ wait() {
+        return Promise.all(this.tasks.flatMap((task)=>task[2]));
+    }
+}
+
+//# sourceMappingURL=multi-file-writer.js.map