fixed watch mode

lib/build.js

@@ -8,11 +8,11 @@ const fs_1 = require("fs");
 const readmeta_1 = __importDefault(require("./readmeta"));
 const prettier_1 = require("prettier");
 const main_1 = require("./main");
-function runBuild(name, watchCallback) {
+async function runBuild(name, watchCallback) {
     //read meta file
     let { meta, metaString } = (0, readmeta_1.default)(name);
     let paths = main_1.AllPaths.script(name);
-    let result = runEsbuild({
+    let result = await runEsbuild({
         entryPoints: [paths.main],
         outfile: paths.dist,
         target: 'esnext',
@@ -42,7 +42,7 @@ function runBuild(name, watchCallback) {
     };
 }
 exports.default = runBuild;
-function runEsbuild(opts, watchCallback) {
+async function runEsbuild(opts, watchCallback) {
     opts.write = false;
     if (main_1.CLIArgs.watch) {
         opts.watch = {
@@ -52,7 +52,7 @@ function runEsbuild(opts, watchCallback) {
         };
     }
     try {
-        let res = (0, esbuild_1.buildSync)(opts);
+        let res = await (0, esbuild_1.build)(opts);
         return getResult(null, res);
     }
     catch (err) {