add rule that if(!foo) should be replaced with unless

描述

if !user
    return res.badRequest ...

unless user
    return res.badRequest..

贡献者指南

技术栈

无

领域

tooling

议题类型

feature

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

2

预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。

1-3 hours

活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。

stale

清晰度议题是否清楚说明期望改动、验收标准和下一步。

clear

前置要求

basic understanding of CoffeeScriptfamiliarity with coffeelint's rule structure

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

65

研究方向

Examine existing rules in coffeelint, such as the 'no unnecessary double parens' rule, to understand how to add a new rule. Look at the source files in the 'src' directory, particularly 'rules/' to see pattern matching on AST nodes. The issue requests a rule that transforms 'if not' or 'if !' conditions to 'unless' when there is no else clause. The implementation likely involves checking the AST for 'If' nodes and then suggesting the replacement.