an error occurs when first build with incremental is true, and can't get the build instance

[xiaoboost]

When I use build method with config incremental: true，such as：

const esbuild = require('esbuild');
const path = require('path');

async function main() {
  try {
    const instance = await esbuild.build({
      incremental: true,
      bundle: true,
      minify: false,
      watch: true,
      entryPoints: [path.join(__dirname, './index.ts')],
    });

    console.log(`重编译实例：${!!instance}`);
  } catch (e) {
    console.log(e);
  }
}

main();

If the first build occurs a error, for example, the code in index.ts：

let let

I can't get result of esbuild.build, it will be into catch statement.

I think do not throw errors here and set errors to errors property of result, it can be better.

[susiwen8]

I think it's better not throwing error under watch mode at first build.