Add additional Pages Functions options for internal builds (#223)

* Add Pages Functions config output option

* Add ability to compile directory other than functions for wrangler pages functions build

.changeset/eight-fans-drum.md

@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+Add ability to compile a directory other than `functions` for `wrangler pages functions build`.

.changeset/young-timers-talk.md

@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+Add `--output-config-path` option to `wrangler pages functions build` which writes a config file describing the `functions` folder.

packages/wrangler/src/pages.tsx

@@ -4,7 +4,7 @@ import assert from "assert";
 import type { BuilderCallback } from "yargs";
 import { join } from "path";
 import { tmpdir } from "os";
-import { existsSync, lstatSync, readFileSync } from "fs";
+import { existsSync, lstatSync, readFileSync, writeFileSync } from "fs";
 import { execSync, spawn } from "child_process";
 import { URL } from "url";
 import { getType } from "mime";
@@ -642,6 +642,7 @@ const RUNNING_BUILDERS: BuildResult[] = [];
 
 async function buildFunctions({
   scriptPath,
+  outputConfigPath,
   functionsDirectory,
   minify = false,
   sourcemap = false,
@@ -650,6 +651,7 @@ async function buildFunctions({
   onEnd,
 }: {
   scriptPath: string;
+  outputConfigPath?: string;
   functionsDirectory: string;
   minify?: boolean;
   sourcemap?: boolean;
@@ -668,6 +670,13 @@ async function buildFunctions({
     baseURL: "/",
   });
 
+  if (outputConfigPath) {
+    writeFileSync(
+      outputConfigPath,
+      JSON.stringify({ ...config, baseURL: "/" }, null, 2)
+    );
+  }
+
   await writeRoutesModule({
     config,
     srcDir: functionsDirectory,
@@ -949,50 +958,62 @@ export const pages: BuilderCallback<unknown, unknown> = (yargs) => {
     )
     .command("functions", "Cloudflare Pages Functions", (yargs) =>
       yargs.command(
-        "build",
+        "build [directory]",
         "Compile a folder of Cloudflare Pages Functions into a single Worker",
         (yargs) =>
-          yargs.options({
-            "script-path": {
-              type: "string",
-              default: "_worker.js",
-              description: "The location of the output Worker script",
-            },
-            minify: {
-              type: "boolean",
-              default: false,
-              description: "Minify the output Worker script",
-            },
-            sourcemap: {
-              type: "boolean",
-              default: false,
-              description: "Generate a sourcemap for the output Worker script",
-            },
-            "fallback-service": {
+          yargs
+            .positional("directory", {
               type: "string",
-              default: "ASSETS",
-              description:
-                "The service to fallback to at the end of the `next` chain. Setting to '' will fallback to the global `fetch`.",
-            },
-            watch: {
-              type: "boolean",
-              default: false,
-              description:
-                "Watch for changes to the functions and automatically rebuild the Worker script",
-            },
-          }),
+              default: "functions",
+              description: "The directory of Pages Functions",
+            })
+            .options({
+              "script-path": {
+                type: "string",
+                default: "_worker.js",
+                description: "The location of the output Worker script",
+              },
+              "output-config-path": {
+                type: "string",
+                description: "The location for the output config file",
+              },
+              minify: {
+                type: "boolean",
+                default: false,
+                description: "Minify the output Worker script",
+              },
+              sourcemap: {
+                type: "boolean",
+                default: false,
+                description:
+                  "Generate a sourcemap for the output Worker script",
+              },
+              "fallback-service": {
+                type: "string",
+                default: "ASSETS",
+                description:
+                  "The service to fallback to at the end of the `next` chain. Setting to '' will fallback to the global `fetch`.",
+              },
+              watch: {
+                type: "boolean",
+                default: false,
+                description:
+                  "Watch for changes to the functions and automatically rebuild the Worker script",
+              },
+            }),
         async ({
+          directory,
           "script-path": scriptPath,
+          "output-config-path": outputConfigPath,
           minify,
           sourcemap,
           fallbackService,
           watch,
         }) => {
-          const functionsDirectory = "./functions";
-
           await buildFunctions({
             scriptPath,
-            functionsDirectory,
+            outputConfigPath,
+            functionsDirectory: directory,
             minify,
             sourcemap,
             fallbackService,