49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
/**
|
|
* Copyright (c) 2015-present, Facebook, Inc.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @format
|
|
* @flow
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
/**
|
|
* Tries to stringify with JSON.stringify and toString, but catches exceptions
|
|
* (e.g. from circular objects) and always returns a string and never throws.
|
|
*/
|
|
function stringifySafe(arg: any): string {
|
|
let ret;
|
|
const type = typeof arg;
|
|
if (arg === undefined) {
|
|
ret = 'undefined';
|
|
} else if (arg === null) {
|
|
ret = 'null';
|
|
} else if (type === 'string') {
|
|
ret = '"' + arg + '"';
|
|
} else if (type === 'function') {
|
|
try {
|
|
ret = arg.toString();
|
|
} catch (e) {
|
|
ret = '[function unknown]';
|
|
}
|
|
} else {
|
|
// Perform a try catch, just in case the object has a circular
|
|
// reference or stringify throws for some other reason.
|
|
try {
|
|
ret = JSON.stringify(arg);
|
|
} catch (e) {
|
|
if (typeof arg.toString === 'function') {
|
|
try {
|
|
ret = arg.toString();
|
|
} catch (E) {}
|
|
}
|
|
}
|
|
}
|
|
return ret || '["' + type + '" failed to stringify]';
|
|
}
|
|
|
|
module.exports = stringifySafe;
|