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# react-fs | ||
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This package is meant to be used alongside yet-to-be-released, experimental React features. It's unlikely to be useful in any other context. | ||
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**Do not use in a real application.** We're publishing this early for | ||
demonstration purposes. | ||
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**Use it at your own risk.** | ||
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# No, Really, It Is Unstable | ||
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The API ~~may~~ will change wildly between versions. |
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/** | ||
* Copyright (c) Facebook, Inc. and its affiliates. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
* | ||
* @flow | ||
*/ | ||
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throw new Error( | ||
'This entry point is not yet supported in the browser environment', | ||
); |
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/** | ||
* Copyright (c) Facebook, Inc. and its affiliates. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
* | ||
* @flow | ||
*/ | ||
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'use strict'; | ||
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export * from './index.node'; |
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/** | ||
* Copyright (c) Facebook, Inc. and its affiliates. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
* | ||
* @flow | ||
*/ | ||
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'use strict'; | ||
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export * from './src/ReactFilesystem'; |
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'use strict'; | ||
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if (process.env.NODE_ENV === 'production') { | ||
module.exports = require('./cjs/react-fs.browser.production.min.js'); | ||
} else { | ||
module.exports = require('./cjs/react-fs.browser.development.js'); | ||
} |
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'use strict'; | ||
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module.exports = require('./index.node'); |
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'use strict'; | ||
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if (process.env.NODE_ENV === 'production') { | ||
module.exports = require('./cjs/react-fs.node.production.min.js'); | ||
} else { | ||
module.exports = require('./cjs/react-fs.node.development.js'); | ||
} |
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{ | ||
"private": true, | ||
"name": "react-fs", | ||
"description": "React bindings for the filesystem", | ||
"version": "0.0.0", | ||
"repository": { | ||
"type" : "git", | ||
"url" : "https://github.com/facebook/react.git", | ||
"directory": "packages/react-fs" | ||
}, | ||
"files": [ | ||
"LICENSE", | ||
"README.md", | ||
"build-info.json", | ||
"index.js", | ||
"index.node.js", | ||
"index.browser.js", | ||
"cjs/" | ||
], | ||
"browser": { | ||
"./index.js": "./index.browser.js" | ||
} | ||
} |
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/** | ||
* Copyright (c) Facebook, Inc. and its affiliates. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
* | ||
* @flow | ||
*/ | ||
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import type {Wakeable, Thenable} from 'shared/ReactTypes'; | ||
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import {unstable_getCacheForType} from 'react'; | ||
import * as fs from 'fs/promises'; | ||
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const Pending = 0; | ||
const Resolved = 1; | ||
const Rejected = 2; | ||
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type PendingResult = {| | ||
status: 0, | ||
value: Wakeable, | ||
|}; | ||
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type ResolvedResult<T> = {| | ||
status: 1, | ||
value: T, | ||
|}; | ||
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type RejectedResult = {| | ||
status: 2, | ||
value: mixed, | ||
|}; | ||
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type Result<T> = PendingResult | ResolvedResult<T> | RejectedResult; | ||
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function toResult<T>(thenable: Thenable<T>): Result<T> { | ||
const result: Result<T> = { | ||
status: Pending, | ||
value: thenable, | ||
}; | ||
thenable.then( | ||
value => { | ||
if (result.status === Pending) { | ||
const resolvedResult = ((result: any): ResolvedResult<T>); | ||
resolvedResult.status = Resolved; | ||
resolvedResult.value = value; | ||
} | ||
}, | ||
err => { | ||
if (result.status === Pending) { | ||
const rejectedResult = ((result: any): RejectedResult); | ||
rejectedResult.status = Rejected; | ||
rejectedResult.value = err; | ||
} | ||
}, | ||
); | ||
return result; | ||
} | ||
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function readResult<T>(result: Result<T>): T { | ||
if (result.status === Resolved) { | ||
return result.value; | ||
} else { | ||
throw result.value; | ||
} | ||
} | ||
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function createReadFileCache(): Map<string, Result<Buffer>> { | ||
return new Map(); | ||
} | ||
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export function readFile( | ||
path: string, | ||
options: | ||
| string | ||
| { | ||
encoding?: string | null, | ||
// Ignored: | ||
flag?: string, | ||
signal?: mixed, | ||
}, | ||
): string | Buffer { | ||
const map = unstable_getCacheForType(createReadFileCache); | ||
let entry = map.get(path); | ||
if (!entry) { | ||
const thenable = fs.readFile(path); | ||
entry = toResult(thenable); | ||
map.set(path, entry); | ||
} | ||
const result: Buffer = readResult(entry); | ||
if (!options) { | ||
return result; | ||
} | ||
let enc = typeof options === 'string' ? options : options.encoding; | ||
if (typeof enc !== 'string') { | ||
return result; | ||
} | ||
let textCache = | ||
(result: any)._reactTextCache || ((result: any)._reactTextCache = []); | ||
for (let i = 0; i < textCache.length; i += 2) { | ||
if (textCache[i] === enc) { | ||
return textCache[i + 1]; | ||
} | ||
} | ||
const text = result.toString((enc: any)); | ||
textCache.push(enc, text); | ||
return text; | ||
} |
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