Can TSLint and ESLint give a warning when a function is accessed as a property?

There have been instances where I've made this specific mistake, and I'm curious if there are any ESLint or TSLint rules in place that could detect it.

if (this.isBrowser && this.imageURL) {.....}

private isBrowser(): boolean{
    return isPlatformBrowser(this.platformId);
}

By using this.isBrowser, it will always result in true since it's a function which is truthy. The alternatives would be to utilize either get isBrowser() {} or this.isBrowser()

Is there a way for ESLint or TSLint to identify and notify when a function call is mistakenly written as a property accessor?

javascripttypescripteslinttslint

Answer №1

Linters can only handle property getters if they are potentially no-op, as indicated by the TSLint/ESLint no-unused-expression rule:

this.isBrowser; // causes linter error

This specifically applies to Chai assertions. In all other cases, this.isBrowser is not considered a no-op.

Using if (this.isBrowser) is a valid line of code that verifies the truthiness of the isBrowser member. It could also be used in a method, like so: 

if (this.isBrowser) this.isBrowser()
.

To address this issue with TypeScript, it's important to avoid being lax about conditions

if (this.isBrowser === true && this.imageURL) {.....}

This will throw a type error if isBrowser happens to be a function.

This dilemma often arises from inconsistent code style. If a method checking browser status is named isBrowser, what should the boolean property be called? The confusion between a method and a property highlights the need for using distinct names - such as getIsBrowser for a method that returns a boolean, while reserving isBrowser solely for boolean values.

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