work.suroh.tk/node_modules/gray-matter/lib/utils.js

63 lines
1.2 KiB
JavaScript

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