13.3.0 • Public • Published



Intelligently parse and output TODOs and FIXMEs from comments in your files

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Easily extract, collect and report TODOs and FIXMEs in your code. This project uses regex in order to extract your todos from comments.

Basic output example of leasot

Comment format

TODO: add some info

  • Spaces are optional.
  • Colon is optional.
  • Must be in a comment (line or block) in its' own line (some code(); //TODO: do something is not supported).
  • Can be prefixed with a @ (i.e @TODO).
  • Spaces are trimmed around comment text.
  • Supported default types are TODO and FIXME - case insensitive.
  • Additional types can be added (using tags in cli and customTags in leasot.parse)
  • New extensions can be associated with bundled parsers as many languages have overlapping syntax
  • Supports both leading and trailing references. Examples:
    • // TODO(tregusti): Make this better
    • // TODO: Text /tregusti

Supported languages

49+ languages are supported, pull requests for additional language support is most welcomed!

Usage in command line

npm install --global leasot

Command line help

$ leasot --help

Usage: leasot [options] <file ...>

Parse and output TODOs and FIXMEs from comments in your files

  -V, --version                        output the version number
  -A, --associate-parser [ext,parser]  associate unknown extensions with bundled parsers (parser optional / default: defaultParser) (default: {})
  -i, --ignore <patterns>              add ignore patterns (default: [])
  -I, --inline-files                   parse possible inline files (default: false)
  -r, --reporter [reporter]            use reporter (table|json|xml|markdown|vscode|raw) (default: table) (default: "table")
  -S, --skip-unsupported               skip unsupported filetypes (default: false)
  -t, --filetype [filetype]            force the filetype to parse. Useful for streams (default: .js)
  -T, --tags <tags>                    add additional comment types to find (alongside todo & fixme) (default: [])
  -x, --exit-nicely                    exit with exit code 0 even if todos/fixmes are found (default: false)
  -h, --help                           output usage information

    # Check a specific file
    $ leasot index.js

    # Check php files with glob
    $ leasot '**/*.php'

    # Check multiple different filetypes
    $ leasot 'app/**/*.js' test.rb

    # Use the json reporter
    $ leasot --reporter json index.js

    # Search for REVIEW comments as well
    $ leasot --tags review index.js

    # Add ignore pattern to filter matches
    $ leasot 'app/**/*.js' --ignore '**/custom.js'

    # Search for REVIEW comments as well
    $ leasot --tags review index.js

    # Check a stream specifying the filetype as coffee
    $ cat index.coffee | leasot --filetype .coffee

    # Report from leasot parsing and filter todos using `jq`
    $ leasot 'tests/**/*.styl' --reporter json | jq 'map(select(.tag == "TODO"))' | leasot-reporter

    # Associate a parser for an unknown extension`
    $ leasot -A '.svelte,twigParser' -A '.svelte,defaultParser' 'frontend/*.svelte'

Usage in NPM scripts

Use leasot -x in order to prevent exiting with a non-zero exit code. This is a good solution if you plan to run leasot in a CI tool to generate todos.

    "scripts": {
        "todo": "leasot 'src/**/*.js'",
        "todo-ci": "leasot -x --reporter markdown 'src/**/*.js' > TODO.md"
    "devDependencies": {
        "leasot": "^7.0.0"

Programmatic Installation

npm install --save-dev leasot

Programmatic Examples

const fs = require('fs');
const leasot = require('leasot');

const contents = fs.readFileSync('./contents.js', 'utf8');
// get the filetype of the file, or force a special parser
const filetype = path.extname('./contents.js');
// add file for better reporting
const file = 'contents.js';
const todos = leasot.parse(contents, { extension: filetype, filename: file });

// -> todos now contains the array of todos/fixme parsed

const output = leasot.report(todos, 'json', { spacing: 2 });

// -> json output of the todos

Leasot with build tools


const leasot = require('leasot');

See main exported functions

Mainly, you should be using 2 functions:

  • parse for parsing file contents
  • report for reporting the todos

Type documentation

Built-in Reporters

See built-in reporters


MIT © Gilad Peleg

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