ESLint Reimagined: Creating a Linter from Scratch

Welcome, this repo is part of my youtube video about Creating your own ESLint from scratch (en-us)

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Complete source code

Access it in app

Usage

Go to app and restore dependencies as follows:

nvm use
npm i
npm link
eslint-clone --file filename.js

Example

eslint-clone --file error.js

Outputs

Error: use "const" instead of "var"
error.js:1:1
Error: use single quotes instead of double quotes
error.js:1:12
Error: use single quotes instead of double quotes
error.js:1:23
Error: use "const" instead of "var"
error.js:2:1
Error: use single quotes instead of double quotes
error.js:3:24
Error: use "let" instead of "var"
error.js:5:1
Error: use single quotes instead of double quotes
error.js:6:25
Error: use single quotes instead of double quotes
error.js:9:25
Error: use "const" instead of "let"
error.js:15:1
Error: use single quotes instead of double quotes
error.js:15:25
Error: use single quotes instead of double quotes
error.js:17:9
Linting completed with 11 error(s).

Code fixed and saved at ./error.linted.js successfully!

Cleaning Up

npm unlink eslint-clone

Tasks

fix the bug when replacing quotes
- if a code have single quotes enclosing double quotes such as:
```
const name = '"ana"'
```
  it'd be transformed as below and will cause a syntax error.
```
const name = ''ana''
```
- How to fix: replace it to a template string instead.
  - Input:
```
'"double"'.replaceAll('"', "'");
```
  - Current Output:
```
''double''.replaceAll(''', ''');
```
  - Expected Output:
```
`"double"`.replaceAll(`"`, `'`);
```
keep line breaks
keep comments
keep spaces
don't put semicolons automatically
report missing semicolon ';'