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Rich Trott
05b566a5ef
Update ESLint 3.3.0 and update .eslintrc: * replace deprecated no-negated-in-lhs rule with no-unsafe-negation * http://eslint.org/docs/rules/no-negated-in-lhs * http://eslint.org/docs/rules/no-unsafe-negation * enable no-template-curly-in-string * http://eslint.org/docs/rules/no-template-curly-in-string * enable no-global-assign * http://eslint.org/docs/rules/no-global-assign * enable func-call-spacing * http://eslint.org/docs/rules/func-call-spacing PR-URL: https://github.com/nodejs/node/pull/8097 Reviewed-By: targos - Michaël Zasso <mic.besace@gmail.com> Reviewed-By: jasnell - James M Snell <jasnell@gmail.com> Reviewed-By: Roman Reiss <me@silverwind.io>
43 lines
1.0 KiB
JavaScript
43 lines
1.0 KiB
JavaScript
var isObjectLike = require('./isObjectLike');
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/** `Object#toString` result references. */
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var errorTag = '[object Error]';
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/**
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* Used to resolve the
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var objectToString = objectProto.toString;
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/**
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* Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
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* `SyntaxError`, `TypeError`, or `URIError` object.
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*
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* @static
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* @memberOf _
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* @since 3.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an error object, else `false`.
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* @example
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*
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* _.isError(new Error);
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* // => true
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*
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* _.isError(Error);
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* // => false
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*/
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function isError(value) {
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if (!isObjectLike(value)) {
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return false;
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}
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return (objectToString.call(value) == errorTag) ||
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(typeof value.message == 'string' && typeof value.name == 'string');
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}
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module.exports = isError;
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