doowb / async-helpers

Use async helpers in template engines like Handlebars and Lodash

async-helpers

Use async helpers in templates with engines that typically only handle sync helpers. Handlebars and Lodash have been tested.

Install

Install with npm:

$ npm install --save async-helpers

Install with yarn:

$ yarn add async-helpers

Usage

var asyncHelpers = require('async-helpers');

API

AsyncHelpers

Create a new instance of AsyncHelpers

Params

• options {Object}: options to pass to instance
• returns {Object}: new AsyncHelpers instance

Example

var asyncHelpers = new AsyncHelpers();

.set

Add a helper to the cache.

Params

• name {String}: Name of the helper
• fn {Function}: Helper function
• returns {Object}: Returns this for chaining

Example

asyncHelpers.set('upper', function(str, cb) {
  cb(null, str.toUpperCase());
});

.get

Get all helpers or a helper with the given name.

Params

• name {String}: Optionally pass in a name of a helper to get.
• options {Object}: Additional options to use.
• returns {Function|Object}: Single helper function when name is provided, otherwise object of all helpers

Example

var helpers = asyncHelpers.get();
var wrappedHelpers = asyncHelpers.get({wrap: true});

.wrapHelper

Wrap a helper with async handling capibilities.

Params

• helper {String}: Optionally pass the name of the helper to wrap
• returns {Function|Object}: Single wrapped helper function when name is provided, otherwise object of all wrapped helpers.

Example

var wrappedHelper = asyncHelpers.wrap('upper');
var wrappedHelpers = asyncHelpers.wrap();

.reset

Reset all the stashed helpers.

• returns {Object}: Returns this to enable chaining

Example

asyncHelpers.reset();

.resolveId

Resolve a stashed helper by the generated id. This is a generator function and should be used with co

Params

• key {String}: ID generated when from executing a wrapped helper.

Example

var upper = asyncHelpers.get('upper', {wrap: true});
var id = upper('doowb');

co(asyncHelpers.resolveId(id))
  .then(console.log)
  .catch(console.error);

//=> DOOWB

.resolveIds

After rendering a string using wrapped async helpers, use resolveIds to invoke the original async helpers and replace the async ids with results from the async helpers.

Params

• str {String}: String containing async ids
• cb {Function}: Callback function accepting an err and content parameters.

Example

asyncHelpers.resolveIds(renderedString, function(err, content) {
  if (err) return console.error(err);
  console.log(content);
});

About

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Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Contributors

Commits	Contributor
85	doowb
44	jonschlinkert
1	nknapp

Building docs

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Running tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test

Author

Brian Woodward

• github/doowb
• twitter/doowb

License

Copyright © 2017, Brian Woodward. Released under the MIT License.

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This file was generated by verb-generate-readme, v0.6.0, on December 13, 2017.