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String.prototype.trimLeft

An ES2019-spec-compliant String.prototype.trimLeft shim. Invoke its "shim" method to shim String.prototype.trimLeft if it is unavailable.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec. In an ES6 environment, it will also work properly with Symbols.

Most common usage:

var trimLeft = require('string.prototype.trimleft');
 
assert(trimLeft(' \t\na \t\n') === 'a \t\n');
 
if (!String.prototype.trimLeft) {
    trimLeft.shim();
}
 
assert(trimLeft(' \t\na \t\n') === ' \t\na \t\n'.trimLeft());

Tests

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