如何跳过打字稿 linter“空检查”，因为它已经在“assert”函数中完成

问题描述

我创建了一个“断言”函数，它检查条件并在条件失败时抛出适当的错误。它的存在是为了从代码库中删除 if/else。

export function assert(predicate : boolean,err: any) {
    if(!predicate) throw err;
}

我正在 assert 函数中进行“空检查”，但 tslint 显示“对象可能为‘空’。”

public async run(params: LoginUserDTO,context: any): Promise<LoginUserResponse> 
{

    await this.validateInput(params);
    const {email,password} = params;

    const user: User | null = await this.userRepository.getByEmail(email);

    // I'm doing "null-checking" here
    assert(!!user,new EmailOrPasswordDidNotMatchError());
      
    // Linter is showing warning here,"user is possibly 'null'."
    assert(user.isEmailVerified,new EmailNotVerifiedError());

    // Linter is showing warning here,"user is possibly 'null'."
    const passwordMatched = await Password.compare(password,user.password);

    // Linter is showing warning here,"user is possibly 'null'."
    assert(passwordMatched,new EmailOrPasswordDidNotMatchError());
    
    // Linter is showing warning here,"user is possibly 'null'."
    const loginTokens = await this.getLoginTokens(user);

    return new LoginUserResponse(loginTokens.accesstoken,loginTokens.refreshToken);
}

有什么办法可以处理这种情况吗？要么如果我之前有断言，我如何编写自定义 tslint 规则以跳过“空检查”？

更新：感谢@OlegValter，我找到了处理这个问题的方法。这是更新的“断言”功能，我添加了断言 singnature

function assert(predicate : boolean,err: any) : asserts predicate {
    if(!predicate) throw err;
}

解决方法

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