ESLint

ESLint is used to

	yes	no
compile JavaScript	[ ]	[x]
check style issues	[x]	[ ]
to detect unused variables	[x]	[ ]
measure code complexity	[ ]	[x]
to detect division by zero	[x]	[ ]
enforce coding conventions	[x]	[ ]
measure test coverage	[ ]	[x]

ESLint performs static analysis of source code. See ESLint.org

How do you install ESLint globally?

	yes	no
install eslint	[ ]	[x]
npm install eslint	[ ]	[x]
npm install eslint -g	[x]	[ ]

If you’re installing something that you want to use in your shell, on the command line or something, install it globally, so that its binaries end up in your PATH environment variable: npm install eslint -g

Which configuration options should be selected, if you want to set

• as errors: missing semicolon, empty block statements and use of constant expressions in conditions

• as warnings: whitespace at the end of line, mixed spaces and tabs for indentation (Smart Tabs off) and disallow labels that share a name with a variable

• other possible options off

	yes	no
"semi": 1,	[ ]	[x]
"semicolon": 2,	[ ]	[x]
"semi": 2,	[x]	[ ]
"no-empty": 2,	[x]	[ ]
"no-empty": 1	[ ]	[x]
"no-empty-class": 1	[ ]	[x]
"no-constant-condition": 1,	[ ]	[x]
"no-constant-condition": 2,	[x]	[ ]
"no-trailing-spaces": 1,	[x]	[ ]
"no-trailing-spaces": 2,	[ ]	[x]
"no-plusplus": 2,	[ ]	[x]
"no-plusplus": 1,	[ ]	[x]
"no-mixed-spaces-and-tabs": [1, false],	[x]	[ ]
"no-mixed-spaces-and-tabs": [1, true],	[ ]	[x]
"no-mixed-spaces-and-tabs": [2, false],	[ ]	[x]
"no-label-var": 1,	[x]	[ ]
"no-label-var": 2,	[ ]	[x]

Hey, let's be careful out there!