That should do

src/commands/remote/push.ts

@@ -2,6 +2,34 @@ import chalk from "chalk";
 import { getApiClient } from "../../api.js";
 import fs from "fs";
 import path from "path";
+import { createHash } from "crypto";
+
+async function deleteNonexistentFiles(
+  currentFiles: any[],
+  files: any[],
+  client: any,
+  options: any,
+): Promise<{ didDeletion: boolean }> {
+  let didDeletion = false;
+  for (const currentFile of currentFiles) {
+    if (!files.some((f: any) => f.filename === currentFile.name)) {
+      try {
+      await client.delete(
+        `/api/function/${options.id}/file/${currentFile.id}`,
+        {
+          data: { filename: currentFile.name },
+        },
+      );} catch (error: any) {
+        throw error;
+      }
+      console.log(
+        chalk.green(`Deleted ${currentFile.name} from function ${options.id}`),
+      );
+      didDeletion = true;
+    }
+  }
+  return { didDeletion };
+}
 
 export const pushDefinition = {
   name: "push",
@@ -19,21 +47,112 @@ export const pushDefinition = {
       return;
     }
 
-    const files = fs.readdirSync(options.from).map(file => ({
+    let didDeletion = false; // Track if any deletions were made
+
+    const currentFilesResponse = await client.get(
+      `/api/function/${options.id}/files`,
+    );
+    const currentFiles = currentFilesResponse.data.data; // Expecting { name: string, id: string [...] }[]
+
+    const files = fs.readdirSync(options.from).map((file) => ({
       filename: file,
-      content: fs.readFileSync(path.join(options.from, file), 'utf-8')
+      content: fs.readFileSync(path.join(options.from, file), "utf-8"),
     }));
 
     if (!options.force && files.length > 5) {
-      console.log(chalk.yellow('Too many modifications. Please use --force to confirm.'));
+      console.log(
+        chalk.yellow("Too many modifications. Please use --force to confirm."),
+      );
       return;
     }
 
+    // Push new and modified files
+    let pushedFilesCount = 0;
     try {
-      await client.post(`/functions/${options.id}/files`, { files });
-      console.log(chalk.green(`Successfully pushed ${files.length} files to function ${options.id}`));
+      for (const file of files) {
+        // Hash first, save traffic
+        const fileHash = createHash("md5").update(file.content).digest("hex");
+        const currentFile = currentFiles.find(
+          (f: any) => f.name === file.filename,
+        );
+        if (currentFile) {
+          // If the file content exists in the response, we can hash it. 
+          // Note: currentFiles from /api/function/:id/files might not have content by default depending on API,
+          // but the original code assumes it does.
+          const currentFileHash = createHash("md5")
+            .update(currentFile.content || "")
+            .digest("hex");
+          if (fileHash === currentFileHash) {
+            console.log(
+              chalk.yellow(
+                `Skipping ${file.filename}, no changes detected for function ${options.id}`,
+              ),
+            );
+            continue;
+          }
+        }
+
+        await client.put(`/api/function/${options.id}/file`, {
+          filename: file.filename,
+          code: file.content,
+        });
+
+        console.log(
+          chalk.green(`Pushed ${file.filename} to function ${options.id}`),
+        );
+        pushedFilesCount++;
+      }
+
+      // Delete files that no longer exist on the remote AFTER pushing new/updated files
+      // This avoids the "cannot delete only file" error if we are pushing at least one file.
+      try {
+        const deletionResult = await deleteNonexistentFiles(
+          currentFiles,
+          files,
+          client,
+          options,
+        );
+        if (deletionResult.didDeletion) {
+          didDeletion = true;
+        }
+      } catch (error: any) {
+        if (error.response) {
+          console.error(
+            chalk.red(
+              `Failed to delete files: ${error.response.data?.message || error.response.statusText}`,
+            ),
+          );
+        } else {
+          console.error(chalk.red(`Error during deletion: ${error.message}`));
+        }
+      }
+
+      console.log(
+        chalk.green(
+          `Successfully pushed ${pushedFilesCount} files to function ${options.id}`,
+        ),
+      );
+
+      if (didDeletion) {
+        console.log("");
+        console.log(
+          chalk.blue(
+            `Hint: We might delete files that you renamed, but don't worry, we'll push the newly named file right after!`,
+          ),
+        );
+      }
     } catch (error: any) {
-      console.error(chalk.red(`Failed to push files: ${error.message}`));
+      if (error.response) {
+        console.error(
+          chalk.red(
+            `Failed to push files: ${error.response.data?.message || error.response.statusText}`,
+          ),
+        );
+      } else if (error.request) {
+        console.error(chalk.red("No response received from server."));
+      } else {
+        console.error(chalk.red(`Error: ${error.message}`));
+      }
     }
   },
 };