gruntfile.js

module.exports = grunt => {
  require('jit-grunt')(grunt);

  grunt.initConfig({
    path: {
      tasks: 'tasks',

      source: {
        root: 'tests/fixtures',
        single: '<%= path.source.root %>/single',
        multiple: '<%= path.source.root %>/multiple',
        nested: '<%= path.source.root %>/nested'
        // withError: '<%= path.source.root %>/withError'
      },

      build: {
        root: 'build',
        singleWithDefaults: '<%= path.build.root %>/singleWithDefaults.json',
        multipleWithDefaults:
          '<%= path.build.root %>/multipleWithDefaults.json',
        nestedWithDefaults: '<%= path.build.root %>/nestedWithDefaults.json',
        expandedNestedWithDefaults:
          '<%= path.build.root %>/expandedNestedWithDefaults',
        notImage: '<%= path.build.root %>/not-image.json',
        singleWithProcessName:
          '<%= path.build.root %>/singleWithProcessName.json',
        singleWithProcessEntry:
          '<%= path.build.root %>/singleWithProcessEntry.json',
        singleWithProcessSizes:
          '<%= path.build.root %>/singleWithProcessSizes.json',
        singleWithConfigObject: 'configObjectTest',
        singleWithConfigObjectAndDest: {
          dest: '<%= path.build.root %>/singleWithConfigObjectAndDest.json',
          property: 'configObjectAndDestTest'
        }
      }
    }
  });

  grunt.loadTasks(grunt.config('path.tasks'));

  grunt.config('image_size', {
    singleWithDefaults: {
      src: '<%= path.source.single %>/*',
      dest: '<%= path.build.singleWithDefaults %>'
    },
    multipleWithDefaults: {
      src: '<%= path.source.multiple %>/*',
      dest: '<%= path.build.multipleWithDefaults %>'
    },
    nestedWithDefaults: {
      src: '<%= path.source.nested %>/{,**/}*',
      dest: '<%= path.build.nestedWithDefaults %>'
    },
    expandedNestedWithDefaults: {
      files: [
        {
          expand: true,
          cwd: '<%= path.source.nested %>',
          src: ['{,**/}*'],
          ext: '.json',
          dest: '<%= path.build.expandedNestedWithDefaults %>'
        }
      ]
    },
    singleWithProcessName: {
      options: {
        processName: name =>
          name.replace(grunt.template.process('<%= path.source.single %>'), '')
      },
      src: '<%= path.source.single %>/*',
      dest: '<%= path.build.singleWithProcessName %>'
    },
    singleWithProcessEntry: {
      options: {
        processEntry: entry => {
          entry.test = 'This is test a property';
          return entry;
        }
      },
      src: '<%= path.source.single %>/*',
      dest: '<%= path.build.singleWithProcessEntry %>'
    },
    singleWithProcessSizes: {
      options: {
        processSizes: sizes => {
          sizes.push('This is a testing value');
          return sizes;
        }
      },
      src: '<%= path.source.single %>/*',
      dest: '<%= path.build.singleWithProcessSizes %>'
    },
    singleWithConfigObject: {
      options: {
        configObject: '<%= path.build.singleWithConfigObject %>'
      },
      src: '<%= path.source.single %>/*'
    },
    singleWithConfigObjectAndDest: {
      options: {
        configObject: '<%= path.build.singleWithConfigObjectAndDest.property %>'
      },
      src: '<%= path.source.single %>/*',
      dest: '<%= path.build.singleWithConfigObjectAndDest.dest %>'
    },
    notImage: {
      src: '<%= path.source.notImage %>/*',
      dest: '<%= path.build.notImage %>'
    }
  });

  grunt.config('clean', {
    build: {
      src: ['<%= path.build.root %>/*']
    }
  });

  // This is just for manual testing. It isn't used anywhere
  // Instead, Jest manually calls task which it needs to test
  grunt.registerTask('test', ['clean', 'image_size']);

  return grunt;
};