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meta.js: add flow

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Summary: Adds flow to `local-cli/bundle/output/meta.js`, and makes some changes to avoid errors.

Reviewed By: cpojer

Differential Revision: D5077563

fbshipit-source-id: bafb9e6705319f6f2e8ae1c820667ad343191b3c
This commit is contained in:
David Aurelio 2017-05-17 07:16:18 -07:00 committed by Facebook Github Bot
parent 44955dfa17
commit 47f52bae67
1 changed files with 11 additions and 5 deletions
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16
local-cli/bundle/output/meta.js
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@ -5,6 +5,8 @@
* 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';
@ -19,12 +21,16 @@ const constantFor = encoding =>
isUTF8(encoding) ? 2 :
/^(?:utf-?16(?:le)?|ucs-?2)$/.test(encoding) ? 3 : 0;
module.exports = function(code, encoding) {
module.exports = function(
code: string,
encoding: 'ascii' | 'utf8' | 'utf16le' = 'utf8',
): Buffer {
const hash = crypto.createHash('sha1');
hash.update(code, encoding);
const digest = hash.digest('binary');
const signature = Buffer.alloc ? Buffer.alloc(digest.length + 1) : new Buffer(digest.length + 1); // remove the new Buffer call when RN drops support for Node 4
signature.write(digest, 'binary');
// remove `new Buffer` calls when RN drops support for Node 4
hash.update(Buffer.from ? Buffer.from(code, encoding) : new Buffer(code, encoding));
const digest = hash.digest();
const signature = Buffer.alloc ? Buffer.alloc(digest.length + 1) : new Buffer(digest.length + 1);
digest.copy(signature);
signature.writeUInt8(
constantFor(tryAsciiPromotion(code, encoding)),
signature.length - 1);