@freecodecamp/strip-comments

strip-comments

Strip line and/or block comments from a string. Blazing fast, and works with JavaScript, Sass, CSS, Less.js, and a number of other languages.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.

• Install
• What does this do?
• Usage
• API
• About

Install

Install with npm (requires Node.js >=10):

$ npm install --save strip-comments

What does this do?

Takes a string and returns a new string with comments removed. Works with line comments and/or block comments. Optionally removes the first comment only or ignores protected comments.

Works with:

• ada
• apl
• applescript
• c
• csharp
• css
• hashbang
• haskell
• java
• javascript
• less
• lua
• matlab
• ocaml
• pascal
• perl
• php
• python
• ruby
• sass
• shebang
• sql
• swift
• typscript
• xml

Usage

By default all comments are stripped.

const strip = require('strip-comments');
const str = strip('const foo = "bar";// this is a comment\n /* me too *\/');
console.log(str);
// => 'const foo = "bar";\n'

For more use-cases see the tests

API

strip

Strip all code comments from the given input, including protected comments that start with !, unless disabled by setting options.keepProtected to true.

Params

• input {String}: string from which to strip comments
• options {Object}: optional options, passed to extract-comments

• line {Boolean}: if false strip only block comments, default true
• block {Boolean}: if false strip only line comments, default true
• keepProtected {Boolean}: Keep ignored comments (e.g. /*! and //!)
• preserveNewlines {Boolean}: Preserve newlines after comments are stripped

• returns {String}: modified input

Example

const str = strip('const foo = "bar";// this is a comment\n /* me too */');
console.log(str);
// => 'const foo = "bar";'

.block

Strip only block comments.

Params

• input {String}: string from which to strip comments
• options {Object}: pass opts.keepProtected: true to keep ignored comments (e.g. /*!)
• returns {String}: modified string

Example

const strip = require('..');
const str = strip.block('const foo = "bar";// this is a comment\n /* me too */');
console.log(str);
// => 'const foo = "bar";// this is a comment'

.line

Strip only line comments.

Params

• input {String}: string from which to strip comments
• options {Object}: pass opts.keepProtected: true to keep ignored comments (e.g. //!)
• returns {String}: modified string

Example

const str = strip.line('const foo = "bar";// this is a comment\n /* me too */');
console.log(str);
// => 'const foo = "bar";\n/* me too */'

.first

Strip the first comment from the given input. Or, if opts.keepProtected is true, the first non-protected comment will be stripped.

Params

• input {String}
• options {Object}: pass opts.keepProtected: true to keep comments with !
• returns {String}

Example

const output = strip.first(input, { keepProtected: true });
console.log(output);
// => '//! first comment\nfoo; '

.block

Parses a string and returns a basic CST (Concrete Syntax Tree).

Params

• input {String}: string from which to strip comments
• options {Object}: pass opts.keepProtected: true to keep ignored comments (e.g. /*!)
• returns {String}: modified string

Example

const strip = require('..');
const str = strip.block('const foo = "bar";// this is a comment\n /* me too */');
console.log(str);
// => 'const foo = "bar";// this is a comment'

About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Running Tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test

Building docs

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Related projects

You might also be interested in these projects:

• code-context: Parse a string of javascript to determine the context for functions, variables and comments based… more | homepage
• extract-comments: Uses esprima to extract line and block comments from a string of JavaScript. Also optionally… more | homepage
• parse-code-context: Fast and simple way to parse code context for use with documentation from code comments… more | homepage
• parse-comments: Parse code comments from JavaScript or any language that uses the same format. | homepage

Contributors

Commits	Contributor
82	jonschlinkert
4	tunnckoCore
2	mk-pmb
1	kgryte
1	briandipalma
1	epicoxymoron
1	XuluWarrior

Author

Jon Schlinkert

• GitHub Profile
• Twitter Profile
• LinkedIn Profile

License

Copyright © 2019, Jon Schlinkert. Released under the MIT License.