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An ESnext spec-compliant String.prototype.isWellFormed shim/polyfill/replacement that works as far down as ES3.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the expected ES2024 spec.

Because String.prototype.isWellFormed depends on a receiver (the this value), the main export takes the string to operate on as the first argument.

Getting started

``sh
npm install --save string.prototype.iswellformed
`

Usage/Examples

`js
var isWellFormed = require('string.prototype.iswellformed');
var assert = require('assert');

var leadingPoo = '\uD83D';
var trailingPoo = '\uDCA9';
var wholePoo = leadingPoo + trailingPoo;

assert.ok(isWellFormed(wholePoo));
assert.notOk(isWellFormed(leadingPoo));
assert.notOk(isWellFormed(trailingPoo));
`

`js
var isWellFormed = require('string.prototype.iswellformed');
var assert = require('assert');
/ when String#isWellFormed is not present /
delete String.prototype.isWellFormed;
var shimmed = isWellFormed.shim();

assert.equal(shimmed, isWellFormed.getPolyfill());
assert.deepEqual(wholePoo.isWellFormed(), isWellFormed(wholePoo));
`

`js
var isWellFormed = require('string.prototype.iswellformed');
var assert = require('assert');
/ when String#at is present /
var shimmed = isWellFormed.shim();

assert.equal(shimmed, String.prototype.isWellFormed);
assert.deepEqual(wholePoo.isWellFormed(), isWellFormed(wholePoo));
`

Tests


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

[package-url]: https://npmjs.org/package/string.prototype.iswellformed
[npm-version-svg]: https://versionbadg.es/es-shims/String.prototype.isWellFormed.svg
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[dev-deps-url]: https://david-dm.org/es-shims/String.prototype.isWellFormed#info=devDependencies
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