飞镖检查如果是建设 [英] dart check if is building

问题描述

我想跳过一些关于pub build的特定代码。

I would like to skip some specific code on pub build.

例如：

Log.print（'something $ {StackTrace.current}'）;

Log.print('something ${StackTrace.current}');

我想上面的代码没有在生产中传递给JS。

I would like that the code above was not transpilled to JS in production.

推荐答案

p> Asserts仅在检查模式下执行，并且在生产模式下默认情况下不会包含 pub build ：

Asserts are only executed in checked mode and won't be included by pub build in production mode by default:

assert(() {
  Log.print('something ${StackTrace.current}');
  return true;
})

DartPad示例 无法打印，因为它是以生产模式构建的。

DartPad example doesn't print it because it builds in production mode.

您也可以传递environment混合使用OS环境变量）到 pub build 并在代码中读取

You can also pass "environment" (not mix up with OS environment variables) to pub build and read it in code

transformers: # or dev_transformers
- $dart2js:
  environment: { PROD: "true" }

const prod = String.fromEnvironment('PROD')
print('PROD: $prod');
// prints 'PROD: null' in Dartium
// prints 'PROD: true' in Chrome

另请参见 http://stackoverflow.com/a/22524258/217408

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