You'll first need to install ESLint:

$ npm i eslint --save-dev

Next, install eslint-plugin-class-property:

$ npm install eslint-plugin-class-property --save-dev

Note: If you installed ESLint globally (using the -g flag) then you must also install eslint-plugin-class-property globally.

Add class-property to the plugins section of your .eslintrc configuration file. You can omit the eslint-plugin- prefix:

{
    "plugins": [
        "class-property"
    ]
}

This rule enforces consistent use of semicolons for class properties.

This rule has a single string optio:

• "always" (default) requires semicolons at the end of a class property
• "never" disallows semicolons as the end of a class property

Examples of incorrect code for this rule with the default "always" option:

/*eslint class-properties/semi: ["error", "always"]*/

class MyClass {
    classProperty = 'foo'
}

Examples of correct code for this rule with the default "always" option:

/*eslint class-properties/semi: ["error", "always"]*/

class MyClass {
    classProperty = 'foo';
}

Examples of incorrect code for this rule with the "never" option:

/*eslint class-properties/semi: ["error", "never"]*/

class MyClass {
    classProperty = 'foo';
}

Examples of correct code for this rule with the "never" option:

/*eslint class-properties/semi: ["error", "never"]*/

class MyClass {
    classProperty = 'foo'
}