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use-strict-cli

This command line tool can be used to add or remove 'use strict'; from all JavaScript files within a directory. This tool is helpful if you find yourself wanting to adopt new ES6 language features that are only available if "use strict" statement is added to file.

For example, if you're trying to use let statements in Node.js 4 then you'll see this error if JavaScript file does not have "use strict":

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

Installation

npm install use-strict-cli -g

Usage

Command line help:

use-strict [dir1] [dir2] [dirX] [--remove] [--prefer statement]

All *.js files found within given directories and their sub-directories will be scanned.

Before running this command line tool it is recommended that you commit your current changes to source control or create a backup in case there are any undesirable changes.

Options:

  • --help: Help on using this command
  • --remove: Remove 'use strict' statements
  • --prefer: Preferred "use strict" statement (e.g. "use strict";)

Add 'use strict'; to all files that do not already have it:

use-strict ./src

Remove 'use strict'; from all files that have it:

use-strict ./src --remove

You will be prompted to confirm operation before changes will be saved.

Example

cd ~/myproject
use-strict ./src --prefer '"use strict";'

Scanning following directories:
- /Users/johndoe/myproject/src


"use strict"; statement will be added to the following files:
- server.js
- cluster.js

Continue? (yes) yes