gruntfile-yaml v0.0.1

Write grunt config in yaml.

$ npm install gruntfile-yaml

grunt.yaml

config:
    sass:
        build:
            files:
                static/css/style/css: client/sass/main.sass
    jshint:
        build:
            src:
                - client/js/**/*.js
            options:
                jshintrc: true
    watch:
        options:
            livereload: true
        sass:
            files:
                - client/sass/**/*.sass
            tasks: sass
            options:
                nospawn: true

npm:
    - grunt-contrib-watch
    - grunt-contrib-sass
    - grunt-contrib-jshint

tasks:
    build:
        - sass
        - jshint
    default:
        - build

Gruntfile.js

module.exports = require('gruntfile-yaml')

or if you need to programatically manipulate the config:

module.exports = function (grunt) {
    require('gruntfile-yaml')(grunt, function (data) {
        data.config.jshint.build.options.reporter = require('jshint-stylish')
    })
}