remove-use-strict

This node module removes unnecessary "use strict"; literals from JavaScript code.

Unnecessary "use strict"; ?

A Use Strict Directive is an ExpressionStatement in a Directive Prologue whose StringLiteral is either the exact character sequences "use strict" or 'use strict'. A Use Strict Directive may not contain an EscapeSequence or LineContinuation.

A Directive Prologue is the longest sequence of ExpressionStatement productions occurring as the initial SourceElement productions of a Program or FunctionBody and where each ExpressionStatement in the sequence consists entirely of a StringLiteral token followed a semicolon. The semicolon may appear explicitly or may be inserted by automatic semicolon insertion. A Directive Prologue may be an empty sequence.

via ECMAScript Language Specification - ECMA-262 Edition 5.1

and "use strict" - blog.niw.at

This module removes any instances of "use strict"; that aren't directive prologues. It also has a force option, which will do the removal regardless.

Installation

npm install remove-use-strict

If you're using gulp, the equivalent gulp task azu/gulp-remove-use-strict may be helpful.

Usage Examples

const removeUst = require("remove-use-strict");

let code = `
  var a = 1;
  "use strict";
  "use strict";
`;

removeUst(code);

// Yields:
// var a = 1;

Force option

const removeUst = require("remove-use-strict");

let code = `
  "use strict";
  function a(){
    "use strict";
    let a = "use strict";
  }
`;

removeUst(code, {
  force : true
});

// Yields:
// function a() {
//   var a = 'use strict';
// }

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

License

MIT