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util.js
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util.js
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/**
* Copyright (c) 2015-present, 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.
*
* @flow
*/
'use strict';
import type {AssetDescriptor} from '.';
const assetPropertyBlacklist = new Set([
'files',
'fileSystemLocation',
'path',
]);
function generateAssetTransformResult(assetDescriptor: AssetDescriptor): {|
code: string,
dependencies: Array<string>,
dependencyOffsets: Array<number>,
|} {
const properDescriptor = filterObject(assetDescriptor, assetPropertyBlacklist);
const json = JSON.stringify(properDescriptor);
const assetRegistryPath = 'react-native/Libraries/Image/AssetRegistry';
const code =
`module.exports = require(${JSON.stringify(assetRegistryPath)}).registerAsset(${json});`;
const dependencies = [assetRegistryPath];
const dependencyOffsets = [code.indexOf(assetRegistryPath) - 1];
return {code, dependencies, dependencyOffsets};
}
// Test extension against all types supported by image-size module.
// If it's not one of these, we won't treat it as an image.
function isAssetTypeAnImage(type: string): boolean {
return [
'png', 'jpg', 'jpeg', 'bmp', 'gif', 'webp', 'psd', 'svg', 'tiff',
].indexOf(type) !== -1;
}
function filterObject(object, blacklist) {
const copied = Object.assign({}, object);
for (const key of blacklist) {
delete copied[key];
}
return copied;
}
exports.generateAssetTransformResult = generateAssetTransformResult;
exports.isAssetTypeAnImage = isAssetTypeAnImage;