feat(builder): gen support watch mode

libs/cfworker-builder/lib/commander/index.mjs

@@ -1,6 +1,6 @@
 import mri from 'mri';
 
-class Commander {
+export default class Commander {
   commandMap = new Map();
   addSubCommand(subCommand, options) {
     this.commandMap.set(subCommand, options);
@@ -34,5 +34,3 @@ Good bye~
     );
   }
 }
-
-export default Commander;

libs/cfworker-builder/lib/gen-toml.mjs

@@ -1,30 +1,44 @@
 import 'dotenv/config';
 
-import { readFileSync, writeFileSync } from 'fs';
+import { readFileSync, writeFileSync, watch as _watch } from 'fs';
 
 import MagicString from 'magic-string';
 
-const text = readFileSync('./wrangler.tpl.toml').toString();
+const tplFilePath = './wrangler.tpl.toml';
+const targetFilePath = './wrangler.toml';
 
-const magic = new MagicString(text);
+export function run() {
+  const text = readFileSync(tplFilePath).toString();
 
-const regex = /{{(.+?)}}/gm;
+  const magic = new MagicString(text);
 
-const matches = text.matchAll(regex);
+  const regex = /{{(.+?)}}/gm;
 
-if (!matches) {
-  process.exit(0);
-}
+  const matches = text.matchAll(regex);
+
+  if (!matches) {
+    return;
+  }
 
-for (const match of matches) {
-  const key = match[1];
-  const v = process.env[key];
-  if (v && match.index) {
-    magic.update(match.index, match.index + match[0].length, v);
-    console.log(`"${key}" will be replaced to "[redacted]"`);
-  } else {
-    console.warn(`env variable "${key}" not found.`);
+  for (const match of matches) {
+    const key = match[1];
+    const v = process.env[key];
+    if (v && match.index) {
+      magic.update(match.index, match.index + match[0].length, v);
+      console.log(`"${key}" will be replaced to "[redacted]"`);
+    } else {
+      console.warn(`env variable "${key}" not found.`);
+    }
   }
+
+  writeFileSync(targetFilePath, magic.toString());
 }
 
-writeFileSync('./wrangler.toml', magic.toString());
+export function watch() {
+  console.log('watching template file changes...');
+
+  _watch(tplFilePath, {}, () => {
+    console.log(`${tplFilePath} changed.`);
+    run();
+  });
+}

libs/cfworker-builder/lib/index.mjs

@@ -1,11 +1,15 @@
 import Commander from './commander/index.mjs';
+import { run, watch } from './gen-toml.mjs';
 
 const commander = new Commander();
 commander.addSubCommand('gen-toml', {
   handler: (_, argv) => {
     console.log(_);
     console.log(argv);
-    import('./gen-toml.mjs');
+    run();
+    if (argv.watch) {
+      watch();
+    }
   },
   help: 'generate wrangler.toml',
 });