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An ES5 spec-compliant String.prototype.trim shim. Invoke its "shim" method to shim String.prototype.trim if it is unavailable.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec (both ES5 and current).

Most common usage:

var assert = require('assert');
var trim = require('string.prototype.trim');

assert(trim(' \t\na \t\n') === 'a');

trim.shim(); // will be a no-op if not needed

assert(trim(' \t\na \t\n') === ' \t\na \t\n'.trim());

Some implementations of String#trim incorrectly trim zero-width spaces. This shim detects and corrects this behavior.

Simply clone the repo, npm install, and run npm test