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GraphQLError.js
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GraphQLError.js
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/* @flow */
/**
* Copyright (c) 2015, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
import { getLocation } from '../language';
import type { Node } from '../language/ast';
import type { Source } from '../language/source';
/**
* A GraphQLError describes an Error found during the parse, validate, or
* execute phases of performing a GraphQL operation. In addition to a message
* and stack trace, it also includes information about the locations in a
* GraphQL document and/or execution result that correspond to the Error.
*/
declare class GraphQLError extends Error {
/**
* A message describing the Error for debugging purposes.
*
* Enumerable, and appears in the result of JSON.stringify().
*/
message: string,
/**
* An array of { line, column } locations within the source GraphQL document
* which correspond to this error.
*
* Errors during validation often contain multiple locations, for example to
* point out two things with the same name. Errors during execution include a
* single location, the field which produced the error.
*
* Enumerable, and appears in the result of JSON.stringify().
*/
locations: Array<{ line: number, column: number }> | void;
/**
* An array describing the JSON-path into the execution response which
* corresponds to this error. Only included for errors during execution.
*
* Enumerable, and appears in the result of JSON.stringify().
*/
path: Array<string | number> | void;
/**
* An array of GraphQL AST Nodes corresponding to this error.
*/
nodes: Array<Node> | void;
/**
* The source GraphQL document corresponding to this error.
*/
source: Source | void;
/**
* An array of character offsets within the source GraphQL document
* which correspond to this error.
*/
positions: Array<number> | void;
/**
* The original error thrown from a field resolver during execution.
*/
originalError: ?Error;
}
export function GraphQLError( // eslint-disable-line no-redeclare
message: string,
nodes?: ?Array<*>,
source?: ?Source,
positions?: ?Array<number>,
path?: ?Array<string | number>,
originalError?: ?Error
) {
// Include (non-enumerable) stack trace.
if (originalError && originalError.stack) {
Object.defineProperty(this, 'stack', {
value: originalError.stack,
writable: true,
configurable: true
});
} else if (Error.captureStackTrace) {
Error.captureStackTrace(this, GraphQLError);
} else {
Object.defineProperty(this, 'stack', {
value: Error().stack,
writable: true,
configurable: true
});
}
// Compute locations in the source for the given nodes/positions.
let _source = source;
if (!_source && nodes && nodes.length > 0) {
const node = nodes[0];
_source = node && node.loc && node.loc.source;
}
let _positions = positions;
if (!_positions && nodes) {
_positions = nodes.filter(node => Boolean(node.loc))
.map(node => node.loc.start);
}
if (_positions && _positions.length === 0) {
_positions = undefined;
}
let _locations;
const _source2 = _source; // seems here Flow need a const to resolve type.
if (_source2 && _positions) {
_locations = _positions.map(pos => getLocation(_source2, pos));
}
Object.defineProperties(this, {
message: {
value: message,
// By being enumerable, JSON.stringify will include `message` in the
// resulting output. This ensures that the simplist possible GraphQL
// service adheres to the spec.
enumerable: true,
writable: true
},
locations: {
// Coercing falsey values to undefined ensures they will not be included
// in JSON.stringify() when not provided.
value: _locations || undefined,
// By being enumerable, JSON.stringify will include `locations` in the
// resulting output. This ensures that the simplist possible GraphQL
// service adheres to the spec.
enumerable: true
},
path: {
// Coercing falsey values to undefined ensures they will not be included
// in JSON.stringify() when not provided.
value: path || undefined,
// By being enumerable, JSON.stringify will include `path` in the
// resulting output. This ensures that the simplist possible GraphQL
// service adheres to the spec.
enumerable: true
},
nodes: {
value: nodes || undefined
},
source: {
value: _source || undefined,
},
positions: {
value: _positions || undefined,
},
originalError: {
value: originalError
}
});
}
(GraphQLError: any).prototype = Object.create(Error.prototype, {
constructor: { value: GraphQLError },
name: { value: 'GraphQLError' }
});