Silencing the Lint: How to Disable ESLint Errors in Angular 7 TypeScript
Ever encountered that pesky red squiggly line in your Angular 7 TypeScript code, even though it seems perfectly fine to you? That's likely ESLint, the helpful but sometimes overly-zealous code linter, trying to enforce best practices and catch potential errors. While ESLint is a valuable tool, there are times when its warnings might be a bit too strict, hindering your workflow.
This article will guide you through the process of gracefully disabling ESLint errors in your Angular 7 TypeScript projects, focusing on the most common scenarios and providing you with the necessary tools for a smooth development experience.
Scenario: Imagine you're building a component in Angular 7, and you want to use a variable named _temp. ESLint might throw an error stating it's not a valid variable name, recommending you use temp instead. However, for your particular use case, _temp makes sense.
Original Code:
import { Component } from '@angular/core';
@Component({
selector: 'app-my-component',
template: `
<div>
{{ _temp }}
</div>
`,
styles: []
})
export class MyComponent {
_temp: string = 'Some Value';
}
Analysis and Solutions:
ESLint errors can be disabled in several ways, each offering varying levels of granularity:
-
Inline Comments: The quickest and most localized approach is using inline comments. Place
// eslint-disable-next-linebefore the specific line containing the error. This tells ESLint to ignore the rule on that line only.import { Component } from '@angular/core'; @Component({ selector: 'app-my-component', template: ` <div> {{ _temp }} </div> `, styles: [] }) export class MyComponent { // eslint-disable-next-line @typescript-eslint/no-underscore-dangle _temp: string = 'Some Value'; } -
Block Comments: For disabling ESLint rules within a larger code block, use block comments. This approach disables all rules within the comment block.
import { Component } from '@angular/core'; @Component({ selector: 'app-my-component', template: ` <div> {{ _temp }} </div> `, styles: [] }) export class MyComponent { /* eslint-disable @typescript-eslint/no-underscore-dangle */ _temp: string = 'Some Value'; /* eslint-enable @typescript-eslint/no-underscore-dangle */ } -
ESLint Configuration: For more permanent and project-wide control over ESLint rules, you can modify your ESLint configuration file (
tslint.jsonin Angular). This allows you to disable specific rules or modify their behavior globally.{ "extends": [ "tslint:recommended", "tslint-config-prettier", "tslint-angular" ], "rules": { // Disable "no-underscore-dangle" rule globally "@typescript-eslint/no-underscore-dangle": "off" } }
Remember:
- Disabling ESLint should be a deliberate decision. Only disable rules when it's truly necessary and well-justified.
- Consider refactoring your code to comply with ESLint recommendations whenever possible. This improves code quality and maintainability in the long run.
- Use specific rule names: ESLint rules have unique identifiers. Use them for precise rule targeting, avoiding unintended side effects.
By understanding the available methods for disabling ESLint errors in Angular 7 TypeScript, you can effectively address those persistent red lines, maintaining a clean and functional codebase without unnecessary friction.
Resources:
