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index.js
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index.js
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/**
* Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
'use strict';
export type ValueType =
| 'array'
| 'boolean'
| 'function'
| 'null'
| 'number'
| 'object'
| 'regexp'
| 'map'
| 'set'
| 'date'
| 'string'
| 'symbol'
| 'undefined';
// get the type of a value with handling the edge cases like `typeof []`
// and `typeof null`
const getType = (value: any): ValueType => {
if (value === undefined) {
return 'undefined';
} else if (value === null) {
return 'null';
} else if (Array.isArray(value)) {
return 'array';
} else if (typeof value === 'boolean') {
return 'boolean';
} else if (typeof value === 'function') {
return 'function';
} else if (typeof value === 'number') {
return 'number';
} else if (typeof value === 'string') {
return 'string';
} else if (typeof value === 'object') {
if (value.constructor === RegExp) {
return 'regexp';
} else if (value.constructor === Map) {
return 'map';
} else if (value.constructor === Set) {
return 'set';
} else if (value.constructor === Date) {
return 'date';
}
return 'object';
// $FlowFixMe https://github.com/facebook/flow/issues/1015
} else if (typeof value === 'symbol') {
return 'symbol';
}
throw new Error(`value of unknown type: ${value}`);
};
module.exports = getType;