Common utility methods shared accross the asset-pipe project. Intended for use by other modules in the asset-pipe project
$ npm install @asset-pipe/commonThis module have the following API:
Writable stream to build a hash out of all the id properties in an asset feed.
const common = require('@asset-pipe/common');
const JSONStream = require('JSONStream');
const fs = require('fs');
const file = fs.createReadStream('./asset-feed.json');
const parser = JSONStream.parse('*');
const hasher = new common.IdHasher();
file.pipe(parser).pipe(hasher);
hasher.on('finish', () => {
console.log(hasher.hash);
});Writable stream to build a hash out of all the source properties in an asset feed.
const common = require('@asset-pipe/common');
const JSONStream = require('JSONStream');
const fs = require('fs');
const file = fs.createReadStream('./asset-feed.json');
const parser = JSONStream.parse('*');
const hasher = new common.SourceHasher();
file.pipe(parser).pipe(hasher);
hasher.on('finish', () => {
console.log(hasher.hash);
});Writable stream to build a hash out of the content of a non object mode stream.
const common = require('@asset-pipe/common');
const fs = require('fs');
const file = fs.createReadStream('./assets.js');
const hasher = new common.FileHasher();
file.pipe(hasher);
hasher.on('finish', () => {
console.log(hasher.hash);
});Creates a hash out of a String or Buffer
Arguments:
- source -
StringorBuffer- the contents to hash
Returns a hash.
const common = require('@asset-pipe/common');
const fs = require('fs');
fs.readFile('.assets.js', (err, data) => {
const hash = common.hasher(data);
console.log(hash);
});Creates a random file name intended to be used for temp files.
Arguments:
- fileType -
String- extension to be used on the file. Ex;json.
Returns a String of the following format: tmp-{random-value}.{fileType}.
const common = require('@asset-pipe/common');
const tmpFile = common.createTemporaryFilename('json');
console.log(tmpFile);Given an array of hashes, deterministically produces a single hash. Array order is important for determinism.
Arguments:
- arr =
string[]- strings to be hashed together to produce a single hash
Returns a promise that will resolve into a hash string.
const { hashArray } = require('@asset-pipe/common');
const hash = await hashArray(['abc1a2b3', 'bac1a2b3', 'ca21a2b3']);
console.log(hash);Some of the metods in this module operate on what we call the asset feed. What we refere to as an asset feed is the internal data format used in Browserify. We use the exact same data format as Browserify in the asset-pipe project.
When Browserify resolves CommonJS modules each dependency will be read and transformed into an object which looks something like this:
{
"id": "c645cf572a8f5acf8716e4846b408d3b1ca45c58",
"source":
"\"use strict\";module.exports.world=function(){return\"world\"};",
"deps": {},
"file": "./assets/js/bar.js"
}The MIT License (MIT)
Copyright (c) 2017 - Trygve Lie - [email protected]
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