67 lines
1.2 KiB
JavaScript
67 lines
1.2 KiB
JavaScript
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'use strict';
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const stripBom = require('strip-bom-string');
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const typeOf = require('kind-of');
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exports.define = function(obj, key, val) {
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Reflect.defineProperty(obj, key, {
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enumerable: false,
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configurable: true,
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writable: true,
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value: val
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});
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};
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/**
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* Returns true if `val` is a buffer
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*/
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exports.isBuffer = function(val) {
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return typeOf(val) === 'buffer';
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};
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/**
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* Returns true if `val` is an object
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*/
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exports.isObject = function(val) {
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return typeOf(val) === 'object';
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};
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/**
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* Cast `input` to a buffer
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*/
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exports.toBuffer = function(input) {
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return typeof input === 'string' ? Buffer.from(input) : input;
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};
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/**
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* Cast `val` to a string.
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*/
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exports.toString = function(input) {
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if (exports.isBuffer(input)) return stripBom(String(input));
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if (typeof input !== 'string') {
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throw new TypeError('expected input to be a string or buffer');
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}
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return stripBom(input);
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};
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/**
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* Cast `val` to an array.
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*/
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exports.arrayify = function(val) {
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return val ? (Array.isArray(val) ? val : [val]) : [];
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};
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/**
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* Returns true if `str` starts with `substr`.
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*/
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exports.startsWith = function(str, substr, len) {
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if (typeof len !== 'number') len = substr.length;
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return str.slice(0, len) === substr;
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};
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