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**ESLint** is a static code analyzer for JavaScript and TypeScript that checks files for errors, potential bugs, and coding style violations. It does not run the code, but **analyzes its structure** to catch problems early.

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### **Why ESLint is needed**

**1) Finding errors and bugs before the code even runs**
ESLint helps catch typos, incorrect constructs, unused variables, redundant imports, and other errors that could cause failures at runtime.

**2) Maintaining a consistent code style**
ESLint lets you set rules (for example, single quotes, no `var`, mandatory semicolons, etc.) and forces the whole project to follow a consistent style. This is especially important in a team.

**3) Improving readability and code quality**
Consistent code is easier to read, maintain, and refactor.

**4) Preventing anti-patterns**
ESLint can forbid potentially dangerous practices (for example, using `eval`, implicit comparisons, and so on).

**5) Integration with editors and CI**
It highlights errors right in the IDE and can stop a CI build if the code does not comply with the rules.

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### **Summary**

ESLint is needed to:

- **improve code quality,**
- **prevent bugs early,**
- **keep a consistent style across the project,**
- **make code cleaner and easier to understand.**

It is a discipline and control tool for the frontend that saves time and effort when maintaining a project.

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