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- 'use strict';
- var $TypeError = require('es-errors/type');
- var StringPad = require('./StringPad');
- var ToLength = require('./ToLength');
- var ToString = require('./ToString');
- // https://262.ecma-international.org/15.0/#sec-stringpaddingbuiltinsimpl
- module.exports = function StringPaddingBuiltinsImpl(O, maxLength, fillString, placement) {
- if (placement !== 'start' && placement !== 'end' && placement !== 'START' && placement !== 'END') {
- throw new $TypeError('Assertion failed: `placement` must be ~START~ or ~END~');
- }
- var S = ToString(O); // step 1
- var intMaxLength = ToLength(maxLength); // step 2
- var stringLength = S.length; // step 3
- if (intMaxLength <= stringLength) { return S; } // step 4
- var filler = typeof fillString === 'undefined' ? ' ' : ToString(fillString); // steps 5-6
- return StringPad(S, intMaxLength, filler, placement); // step 7
- };
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