47 lines
1.1 KiB
Plaintext
47 lines
1.1 KiB
Plaintext
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @emails oncall+relay
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* @flow strict-local
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* @format
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*/
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// flowlint ambiguous-object-type:error
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'use strict';
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const invariant = require('invariant');
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function getValueAtPath(
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data: mixed,
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path: $ReadOnlyArray<string | number>,
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): mixed {
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let result = data;
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for (const key of path) {
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if (result == null) {
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return null;
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}
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if (typeof key === 'number') {
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invariant(
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Array.isArray(result),
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'Relay: Expected an array when extracting value at path. ' +
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"If you're seeing this, this is likely a bug in Relay.",
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);
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result = result[key];
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} else {
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invariant(
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typeof result === 'object' && !Array.isArray(result),
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'Relay: Expected an object when extracting value at path. ' +
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"If you're seeing this, this is likely a bug in Relay.",
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);
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result = result[key];
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}
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}
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return result;
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}
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module.exports = getValueAtPath;
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