is-empty-function

Check that given string, function or arrow function have empty body, using parse-function.

Install

npm i is-empty-function --save

Usage

For more use-cases see the tests

const isEmptyFunction = require('is-empty-function')

isEmptyFunction

Check that given string, function or arrow function have empty body, using parse-function.

• [val] {Function|ArrowFunction|String} passed to parse-function
• return {Boolean}

Example

const isEmptyFunction = require('is-empty-function')
 
const fixture = "function codeCov () {__cov_Ejgcx$XN18CSfmeWn$f7vQ.f['2']++;};"
isEmptyFunction(fixture)            // => true
isEmptyFunction('function () {}')   // => true
isEmptyFunction('z => {}')          // => true
isEmptyFunction('(a, b) => {}')     // => true
isEmptyFunction(z => {})            // => true
isEmptyFunction((a, b) => {})       // => true
 
// return `false`
isEmptyFunction('function () { return true }')      // => false
isEmptyFunction('z => { return z * z }')            // => false
isEmptyFunction('(a, b) => {}')                     // => false
isEmptyFunction(z => { return z + z })              // => false
isEmptyFunction((a, b) => { return a * b})          // => false
isEmptyFunction((a, b) => a * 2 * z)                // => false
isEmptyFunction(function () { return true })        // => false
isEmptyFunction(function named () { return true })  // => false

Related

• cleanup-coverage-code: Cleanup ugly code added by code coverage tools during the test process. Like this one __cov_Ejgcx$XN18CSfmeWn$f7vQ.f['2']++;.
• is-ansi: Check that given string contain ANSI color codes, without CLI
• is-async-function: Check that given function is async (callback) function or not. Trying to guess that based on check if callback, cb, done or next exists as function argument name.
• is-backslash: Checks given value is backslash - support char code number, hex, unicode or string value to be given.
• is-installed: Checks that given package is installed on the system - globally or locally.
• is-missing: Check that given name or user/repo exists in npm registry or in github as user repository.
• is-real-object: Returns true if a value is any type of object, but not an array. Browserify-ready.
• parse-function: Parse a function, arrow function or string to object with name, args, params and body properties.
• relike: Simple promisify a callback-style function with sane defaults. Support promisify-ing sync functions.

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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