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- var toString = Object.prototype.toString;
-
- module.exports = function kindOf(val) {
- if (val === void 0) return 'undefined';
- if (val === null) return 'null';
-
- var type = typeof val;
- if (type === 'boolean') return 'boolean';
- if (type === 'string') return 'string';
- if (type === 'number') return 'number';
- if (type === 'symbol') return 'symbol';
- if (type === 'function') {
- return isGeneratorFn(val) ? 'generatorfunction' : 'function';
- }
-
- if (isArray(val)) return 'array';
- if (isBuffer(val)) return 'buffer';
- if (isArguments(val)) return 'arguments';
- if (isDate(val)) return 'date';
- if (isError(val)) return 'error';
- if (isRegexp(val)) return 'regexp';
-
- switch (ctorName(val)) {
- case 'Symbol': return 'symbol';
- case 'Promise': return 'promise';
-
- // Set, Map, WeakSet, WeakMap
- case 'WeakMap': return 'weakmap';
- case 'WeakSet': return 'weakset';
- case 'Map': return 'map';
- case 'Set': return 'set';
-
- // 8-bit typed arrays
- case 'Int8Array': return 'int8array';
- case 'Uint8Array': return 'uint8array';
- case 'Uint8ClampedArray': return 'uint8clampedarray';
-
- // 16-bit typed arrays
- case 'Int16Array': return 'int16array';
- case 'Uint16Array': return 'uint16array';
-
- // 32-bit typed arrays
- case 'Int32Array': return 'int32array';
- case 'Uint32Array': return 'uint32array';
- case 'Float32Array': return 'float32array';
- case 'Float64Array': return 'float64array';
- }
-
- if (isGeneratorObj(val)) {
- return 'generator';
- }
-
- // Non-plain objects
- type = toString.call(val);
- switch (type) {
- case '[object Object]': return 'object';
- // iterators
- case '[object Map Iterator]': return 'mapiterator';
- case '[object Set Iterator]': return 'setiterator';
- case '[object String Iterator]': return 'stringiterator';
- case '[object Array Iterator]': return 'arrayiterator';
- }
-
- // other
- return type.slice(8, -1).toLowerCase().replace(/\s/g, '');
- };
-
- function ctorName(val) {
- return val.constructor ? val.constructor.name : null;
- }
-
- function isArray(val) {
- if (Array.isArray) return Array.isArray(val);
- return val instanceof Array;
- }
-
- function isError(val) {
- return val instanceof Error || (typeof val.message === 'string' && val.constructor && typeof val.constructor.stackTraceLimit === 'number');
- }
-
- function isDate(val) {
- if (val instanceof Date) return true;
- return typeof val.toDateString === 'function'
- && typeof val.getDate === 'function'
- && typeof val.setDate === 'function';
- }
-
- function isRegexp(val) {
- if (val instanceof RegExp) return true;
- return typeof val.flags === 'string'
- && typeof val.ignoreCase === 'boolean'
- && typeof val.multiline === 'boolean'
- && typeof val.global === 'boolean';
- }
-
- function isGeneratorFn(name, val) {
- return ctorName(name) === 'GeneratorFunction';
- }
-
- function isGeneratorObj(val) {
- return typeof val.throw === 'function'
- && typeof val.return === 'function'
- && typeof val.next === 'function';
- }
-
- function isArguments(val) {
- try {
- if (typeof val.length === 'number' && typeof val.callee === 'function') {
- return true;
- }
- } catch (err) {
- if (err.message.indexOf('callee') !== -1) {
- return true;
- }
- }
- return false;
- }
-
- /**
- * If you need to support Safari 5-7 (8-10 yr-old browser),
- * take a look at https://github.com/feross/is-buffer
- */
-
- function isBuffer(val) {
- if (val.constructor && typeof val.constructor.isBuffer === 'function') {
- return val.constructor.isBuffer(val);
- }
- return false;
- }
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