Wraps Select 2 Import into its own webpack bundle

Wraps all imports for select 2 to deferred imports,
especially in the main.js we are actually checking if there 
is any select 2 element on the page or not.

app/assets/javascripts/commons/jquery.js

@@ -7,4 +7,3 @@ import 'vendor/jquery.caret';
 import 'vendor/jquery.atwho';
 import 'vendor/jquery.scrollTo';
 import 'jquery.waitforimages';
-import 'select2/select2';

app/assets/javascripts/groups_select.js

@@ -4,93 +4,97 @@ import Api from './api';
 import { normalizeHeaders } from './lib/utils/common_utils';
 export default function groupsSelect() {
-  // Needs to be accessible in rspec
-  window.GROUP_SELECT_PER_PAGE = 20;
-  $('.ajax-groups-select').each(function setAjaxGroupsSelect2() {
-    const $select = $(this);
-    const allAvailable = $select.data('allAvailable');
-    const skipGroups = $select.data('skipGroups') || [];
-    const parentGroupID = $select.data('parentId');
-    const groupsPath = parentGroupID
-      ? Api.subgroupsPath.replace(':id', parentGroupID)
-      : Api.groupsPath;
-    $select.select2({
-      placeholder: 'Search for a group',
-      allowClear: $select.hasClass('allowClear'),
-      multiple: $select.hasClass('multiselect'),
-      minimumInputLength: 0,
-      ajax: {
-        url: Api.buildUrl(groupsPath),
-        dataType: 'json',
-        quietMillis: 250,
-        transport(params) {
-          axios[params.type.toLowerCase()](params.url, {
-            params: params.data,
-          })
-            .then(res => {
-              const results = res.data || [];
-              const headers = normalizeHeaders(res.headers);
-              const currentPage = parseInt(headers['X-PAGE'], 10) || 0;
-              const totalPages = parseInt(headers['X-TOTAL-PAGES'], 10) || 0;
-              const more = currentPage < totalPages;
-              params.success({
-                results,
-                pagination: {
-                  more,
-                },
-              });
-            })
-            .catch(params.error);
-        },
-        data(search, page) {
-          return {
-            search,
-            page,
-            per_page: window.GROUP_SELECT_PER_PAGE,
-            all_available: allAvailable,
-          };
-        },
-        results(data, page) {
-          if (data.length) return { results: [] };
-          const groups = data.length ? data : data.results || [];
-          const more = data.pagination ? data.pagination.more : false;
-          const results = groups.filter(group => skipGroups.indexOf(group.id) === -1);
-          return {
-            results,
-            page,
-            more,
-          };
-        },
-      },
-      // eslint-disable-next-line consistent-return
-      initSelection(element, callback) {
-        const id = $(element).val();
-        if (id !== '') {
-          return Api.group(id, callback);
-        }
-      },
-      formatResult(object) {
-        return `<div class='group-result'> <div class='group-name'>${
-          object.full_name
-        }</div> <div class='group-path'>${object.full_path}</div> </div>`;
-      },
-      formatSelection(object) {
-        return object.full_name;
-      },
-      dropdownCssClass: 'ajax-groups-dropdown select2-infinite',
-      // we do not want to escape markup since we are displaying html in results
-      escapeMarkup(m) {
-        return m;
-      },
-    });
-    $select.on('select2-loaded', () => {
-      const dropdown = document.querySelector('.select2-infinite .select2-results');
-      dropdown.style.height = `${Math.floor(dropdown.scrollHeight)}px`;
-    });
-  });
+  import(/* webpackChunkName: 'select2' */ 'select2/select2')
+    .then(() => {
+      // Needs to be accessible in rspec
+      window.GROUP_SELECT_PER_PAGE = 20;
+      $('.ajax-groups-select').each(function setAjaxGroupsSelect2() {
+        const $select = $(this);
+        const allAvailable = $select.data('allAvailable');
+        const skipGroups = $select.data('skipGroups') || [];
+        const parentGroupID = $select.data('parentId');
+        const groupsPath = parentGroupID
+          ? Api.subgroupsPath.replace(':id', parentGroupID)
+          : Api.groupsPath;
+        $select.select2({
+          placeholder: 'Search for a group',
+          allowClear: $select.hasClass('allowClear'),
+          multiple: $select.hasClass('multiselect'),
+          minimumInputLength: 0,
+          ajax: {
+            url: Api.buildUrl(groupsPath),
+            dataType: 'json',
+            quietMillis: 250,
+            transport(params) {
+              axios[params.type.toLowerCase()](params.url, {
+                params: params.data,
+              })
+                .then(res => {
+                  const results = res.data || [];
+                  const headers = normalizeHeaders(res.headers);
+                  const currentPage = parseInt(headers['X-PAGE'], 10) || 0;
+                  const totalPages = parseInt(headers['X-TOTAL-PAGES'], 10) || 0;
+                  const more = currentPage < totalPages;
+                  params.success({
+                    results,
+                    pagination: {
+                      more,
+                    },
+                  });
+                })
+                .catch(params.error);
+            },
+            data(search, page) {
+              return {
+                search,
+                page,
+                per_page: window.GROUP_SELECT_PER_PAGE,
+                all_available: allAvailable,
+              };
+            },
+            results(data, page) {
+              if (data.length) return { results: [] };
+              const groups = data.length ? data : data.results || [];
+              const more = data.pagination ? data.pagination.more : false;
+              const results = groups.filter(group => skipGroups.indexOf(group.id) === -1);
+              return {
+                results,
+                page,
+                more,
+              };
+            },
+          },
+          // eslint-disable-next-line consistent-return
+          initSelection(element, callback) {
+            const id = $(element).val();
+            if (id !== '') {
+              return Api.group(id, callback);
+            }
+          },
+          formatResult(object) {
+            return `<div class='group-result'> <div class='group-name'>${
+              object.full_name
+            }</div> <div class='group-path'>${object.full_path}</div> </div>`;
+          },
+          formatSelection(object) {
+            return object.full_name;
+          },
+          dropdownCssClass: 'ajax-groups-dropdown select2-infinite',
+          // we do not want to escape markup since we are displaying html in results
+          escapeMarkup(m) {
+            return m;
+          },
+        });
+        $select.on('select2-loaded', () => {
+          const dropdown = document.querySelector('.select2-infinite .select2-results');
+          dropdown.style.height = `${Math.floor(dropdown.scrollHeight)}px`;
+        });
+      });
+    })
+    .catch(() => {});
 }

app/assets/javascripts/issuable/auto_width_dropdown_select.js

@@ -11,10 +11,14 @@ class AutoWidthDropdownSelect {
   init() {
     const { dropdownClass } = this;
-    this.$selectElement.select2({
-      dropdownCssClass: dropdownClass,
-      ...AutoWidthDropdownSelect.selectOptions(this.dropdownClass),
-    });
+    import(/* webpackChunkName: 'select2' */ 'select2/select2')
+      .then(() => {
+        this.$selectElement.select2({
+          dropdownCssClass: dropdownClass,
+          ...AutoWidthDropdownSelect.selectOptions(this.dropdownClass),
+        });
+      })
+      .catch(() => {});
     return this;
   }

app/assets/javascripts/issuable_context.js

@@ -7,10 +7,14 @@ export default class IssuableContext {
   constructor(currentUser) {
     this.userSelect = new UsersSelect(currentUser);
-    $('select.select2').select2({
-      width: 'resolve',
-      dropdownAutoWidth: true,
-    });
+    import(/* webpackChunkName: 'select2' */ 'select2/select2')
+      .then(() => {
+        $('select.select2').select2({
+          width: 'resolve',
+          dropdownAutoWidth: true,
+        });
+      })
+      .catch(() => {});
     $('.issuable-sidebar .inline-update').on('change', 'select', function onClickSelect() {
       return $(this).submit();

app/assets/javascripts/issuable_form.js

@@ -120,35 +120,39 @@ export default class IssuableForm {
   }
   initTargetBranchDropdown() {
-    this.$targetBranchSelect.select2({
-      ...AutoWidthDropdownSelect.selectOptions('js-target-branch-select'),
-      ajax: {
-        url: this.$targetBranchSelect.data('endpoint'),
-        dataType: 'JSON',
-        quietMillis: 250,
-        data(search) {
-          return {
-            search,
-          };
-        },
-        results(data) {
-          return {
-            // `data` keys are translated so we can't just access them with a string based key
-            results: data[Object.keys(data)[0]].map(name => ({
-              id: name,
-              text: name,
-            })),
-          };
-        },
-      },
-      initSelection(el, callback) {
-        const val = el.val();
-
-        callback({
-          id: val,
-          text: val,
+    import(/* webpackChunkName: 'select2' */ 'select2/select2')
+      .then(() => {
+        this.$targetBranchSelect.select2({
+          ...AutoWidthDropdownSelect.selectOptions('js-target-branch-select'),
+          ajax: {
+            url: this.$targetBranchSelect.data('endpoint'),
+            dataType: 'JSON',
+            quietMillis: 250,
+            data(search) {
+              return {
+                search,
+              };
+            },
+            results(data) {
+              return {
+                // `data` keys are translated so we can't just access them with a string based key
+                results: data[Object.keys(data)[0]].map(name => ({
+                  id: name,
+                  text: name,
+                })),
+              };
+            },
+          },
+          initSelection(el, callback) {
+            const val = el.val();
+
+            callback({
+              id: val,
+              text: val,
+            });
+          },
         });
-      },
-    });
+      })
+      .catch(() => {});
   }
 }

app/assets/javascripts/main.js

@@ -100,18 +100,24 @@ function deferredInitialisation() {
   });
   // Initialize select2 selects
-  $('select.select2').select2({
-    width: 'resolve',
-    dropdownAutoWidth: true,
-  });
-
-  // Close select2 on escape
-  $('.js-select2').on('select2-close', () => {
-    setTimeout(() => {
-      $('.select2-container-active').removeClass('select2-container-active');
-      $(':focus').blur();
-    }, 1);
-  });
+  if ($('select.select2').length) {
+    import(/* webpackChunkName: 'select2' */ 'select2/select2')
+      .then(() => {
+        $('select.select2').select2({
+          width: 'resolve',
+          dropdownAutoWidth: true,
+        });
+
+        // Close select2 on escape
+        $('.js-select2').on('select2-close', () => {
+          setTimeout(() => {
+            $('.select2-container-active').removeClass('select2-container-active');
+            $(':focus').blur();
+          }, 1);
+        });
+      })
+      .catch(() => {});
+  }
   // Initialize tooltips
   $body.tooltip({

app/assets/javascripts/project_select.js

@@ -5,97 +5,101 @@ import Api from './api';
 import ProjectSelectComboButton from './project_select_combo_button';
 export default function projectSelect() {
-  $('.ajax-project-select').each(function(i, select) {
-    var placeholder;
-    const simpleFilter = $(select).data('simpleFilter') || false;
-    this.groupId = $(select).data('groupId');
-    this.includeGroups = $(select).data('includeGroups');
-    this.allProjects = $(select).data('allProjects') || false;
-    this.orderBy = $(select).data('orderBy') || 'id';
-    this.withIssuesEnabled = $(select).data('withIssuesEnabled');
-    this.withMergeRequestsEnabled = $(select).data('withMergeRequestsEnabled');
-    this.withShared =
-      $(select).data('withShared') === undefined ? true : $(select).data('withShared');
-    this.includeProjectsInSubgroups = $(select).data('includeProjectsInSubgroups') || false;
-    this.allowClear = $(select).data('allowClear') || false;
-    placeholder = 'Search for project';
-    if (this.includeGroups) {
-      placeholder += ' or group';
-    }
-    $(select).select2({
-      placeholder: placeholder,
-      minimumInputLength: 0,
-      query: (function(_this) {
-        return function(query) {
-          var finalCallback, projectsCallback;
-          finalCallback = function(projects) {
-            var data;
-            data = {
-              results: projects,
-            };
-            return query.callback(data);
-          };
-          if (_this.includeGroups) {
-            projectsCallback = function(projects) {
-              var groupsCallback;
-              groupsCallback = function(groups) {
+  import(/* webpackChunkName: 'select2' */ 'select2/select2')
+    .then(() => {
+      $('.ajax-project-select').each(function(i, select) {
+        var placeholder;
+        const simpleFilter = $(select).data('simpleFilter') || false;
+        this.groupId = $(select).data('groupId');
+        this.includeGroups = $(select).data('includeGroups');
+        this.allProjects = $(select).data('allProjects') || false;
+        this.orderBy = $(select).data('orderBy') || 'id';
+        this.withIssuesEnabled = $(select).data('withIssuesEnabled');
+        this.withMergeRequestsEnabled = $(select).data('withMergeRequestsEnabled');
+        this.withShared =
+          $(select).data('withShared') === undefined ? true : $(select).data('withShared');
+        this.includeProjectsInSubgroups = $(select).data('includeProjectsInSubgroups') || false;
+        this.allowClear = $(select).data('allowClear') || false;
+        placeholder = 'Search for project';
+        if (this.includeGroups) {
+          placeholder += ' or group';
+        }
+        $(select).select2({
+          placeholder: placeholder,
+          minimumInputLength: 0,
+          query: (function(_this) {
+            return function(query) {
+              var finalCallback, projectsCallback;
+              finalCallback = function(projects) {
                 var data;
-                data = groups.concat(projects);
-                return finalCallback(data);
+                data = {
+                  results: projects,
+                };
+                return query.callback(data);
               };
-              return Api.groups(query.term, {}, groupsCallback);
+              if (_this.includeGroups) {
+                projectsCallback = function(projects) {
+                  var groupsCallback;
+                  groupsCallback = function(groups) {
+                    var data;
+                    data = groups.concat(projects);
+                    return finalCallback(data);
+                  };
+                  return Api.groups(query.term, {}, groupsCallback);
+                };
+              } else {
+                projectsCallback = finalCallback;
+              }
+              if (_this.groupId) {
+                return Api.groupProjects(
+                  _this.groupId,
+                  query.term,
+                  {
+                    with_issues_enabled: _this.withIssuesEnabled,
+                    with_merge_requests_enabled: _this.withMergeRequestsEnabled,
+                    with_shared: _this.withShared,
+                    include_subgroups: _this.includeProjectsInSubgroups,
+                  },
+                  projectsCallback,
+                );
+              } else {
+                return Api.projects(
+                  query.term,
+                  {
+                    order_by: _this.orderBy,
+                    with_issues_enabled: _this.withIssuesEnabled,
+                    with_merge_requests_enabled: _this.withMergeRequestsEnabled,
+                    membership: !_this.allProjects,
+                  },
+                  projectsCallback,
+                );
+              }
             };
-          } else {
-            projectsCallback = finalCallback;
-          }
-          if (_this.groupId) {
-            return Api.groupProjects(
-              _this.groupId,
-              query.term,
-              {
-                with_issues_enabled: _this.withIssuesEnabled,
-                with_merge_requests_enabled: _this.withMergeRequestsEnabled,
-                with_shared: _this.withShared,
-                include_subgroups: _this.includeProjectsInSubgroups,
-              },
-              projectsCallback,
-            );
-          } else {
-            return Api.projects(
-              query.term,
-              {
-                order_by: _this.orderBy,
-                with_issues_enabled: _this.withIssuesEnabled,
-                with_merge_requests_enabled: _this.withMergeRequestsEnabled,
-                membership: !_this.allProjects,
-              },
-              projectsCallback,
-            );
-          }
-        };
-      })(this),
-      id: function(project) {
-        if (simpleFilter) return project.id;
-        return JSON.stringify({
-          name: project.name,
-          url: project.web_url,
-        });
-      },
-      text: function(project) {
-        return project.name_with_namespace || project.name;
-      },
-      initSelection: function(el, callback) {
-        return Api.project(el.val()).then(({ data }) => callback(data));
-      },
-      allowClear: this.allowClear,
-      dropdownCssClass: 'ajax-project-dropdown',
-    });
-    if (simpleFilter) return select;
-    return new ProjectSelectComboButton(select);
-  });
+          })(this),
+          id: function(project) {
+            if (simpleFilter) return project.id;
+            return JSON.stringify({
+              name: project.name,
+              url: project.web_url,
+            });
+          },
+          text: function(project) {
+            return project.name_with_namespace || project.name;
+          },
+          initSelection: function(el, callback) {
+            return Api.project(el.val()).then(({ data }) => callback(data));
+          },
+          allowClear: this.allowClear,
+          dropdownCssClass: 'ajax-project-dropdown',
+        });
+        if (simpleFilter) return select;
+        return new ProjectSelectComboButton(select);
+      });
+    })
+    .catch(() => {});
 }

app/assets/javascripts/project_select_combo_button.js

@@ -44,9 +44,13 @@ export default class ProjectSelectComboButton {
   // eslint-disable-next-line class-methods-use-this
   openDropdown(event) {
-    $(event.currentTarget)
-      .siblings('.project-item-select')
-      .select2('open');
+    import(/* webpackChunkName: 'select2' */ 'select2/select2')
+      .then(() => {
+        $(event.currentTarget)
+          .siblings('.project-item-select')
+          .select2('open');
+      })
+      .catch(() => {});
   }
   selectProject() {

app/assets/javascripts/users_select.js

@@ -579,101 +579,109 @@ function UsersSelect(currentUser, els, options = {}) {
       };
     })(this),
   );
-  $('.ajax-users-select').each(
-    (function(_this) {
-      return function(i, select) {
-        var firstUser, showAnyUser, showEmailUser, showNullUser;
-        var options = {};
-        options.skipLdap = $(select).hasClass('skip_ldap');
-        options.projectId = $(select).data('projectId');
-        options.groupId = $(select).data('groupId');
-        options.showCurrentUser = $(select).data('currentUser');
-        options.authorId = $(select).data('authorId');
-        options.skipUsers = $(select).data('skipUsers');
-        showNullUser = $(select).data('nullUser');
-        showAnyUser = $(select).data('anyUser');
-        showEmailUser = $(select).data('emailUser');
-        firstUser = $(select).data('firstUser');
-        return $(select).select2({
-          placeholder: 'Search for a user',
-          multiple: $(select).hasClass('multiselect'),
-          minimumInputLength: 0,
-          query: function(query) {
-            return _this.users(query.term, options, function(users) {
-              var anyUser, data, emailUser, index, len, name, nullUser, obj, ref;
-              data = {
-                results: users,
-              };
-              if (query.term.length === 0) {
-                if (firstUser) {
-                  // Move current user to the front of the list
-                  ref = data.results;
-
-                  for (index = 0, len = ref.length; index < len; index += 1) {
-                    obj = ref[index];
-                    if (obj.username === firstUser) {
-                      data.results.splice(index, 1);
-                      data.results.unshift(obj);
-                      break;
+  import(/* webpackChunkName: 'select2' */ 'select2/select2')
+    .then(() => {
+      $('.ajax-users-select').each(
+        (function(_this) {
+          return function(i, select) {
+            var firstUser, showAnyUser, showEmailUser, showNullUser;
+            var options = {};
+            options.skipLdap = $(select).hasClass('skip_ldap');
+            options.projectId = $(select).data('projectId');
+            options.groupId = $(select).data('groupId');
+            options.showCurrentUser = $(select).data('currentUser');
+            options.authorId = $(select).data('authorId');
+            options.skipUsers = $(select).data('skipUsers');
+            showNullUser = $(select).data('nullUser');
+            showAnyUser = $(select).data('anyUser');
+            showEmailUser = $(select).data('emailUser');
+            firstUser = $(select).data('firstUser');
+            return $(select).select2({
+              placeholder: 'Search for a user',
+              multiple: $(select).hasClass('multiselect'),
+              minimumInputLength: 0,
+              query: function(query) {
+                return _this.users(query.term, options, function(users) {
+                  var anyUser, data, emailUser, index, len, name, nullUser, obj, ref;
+                  data = {
+                    results: users,
+                  };
+                  if (query.term.length === 0) {
+                    if (firstUser) {
+                      // Move current user to the front of the list
+                      ref = data.results;
+
+                      for (index = 0, len = ref.length; index < len; index += 1) {
+                        obj = ref[index];
+                        if (obj.username === firstUser) {
+                          data.results.splice(index, 1);
+                          data.results.unshift(obj);
+                          break;
+                        }
+                      }
+                    }
+                    if (showNullUser) {
+                      nullUser = {
+                        name: 'Unassigned',
+                        id: 0,
+                      };
+                      data.results.unshift(nullUser);
+                    }
+                    if (showAnyUser) {
+                      name = showAnyUser;
+                      if (name === true) {
+                        name = 'Any User';
+                      }
+                      anyUser = {
+                        name: name,
+                        id: null,
+                      };
+                      data.results.unshift(anyUser);
                     }
                   }
-                }
-                if (showNullUser) {
-                  nullUser = {
-                    name: 'Unassigned',
-                    id: 0,
-                  };
-                  data.results.unshift(nullUser);
-                }
-                if (showAnyUser) {
-                  name = showAnyUser;
-                  if (name === true) {
-                    name = 'Any User';
+                  if (
+                    showEmailUser &&
+                    data.results.length === 0 &&
+                    query.term.match(/^[^@]+@[^@]+$/)
+                  ) {
+                    var trimmed = query.term.trim();
+                    emailUser = {
+                      name: 'Invite "' + trimmed + '" by email',
+                      username: trimmed,
+                      id: trimmed,
+                      invite: true,
+                    };
+                    data.results.unshift(emailUser);
                   }
-                  anyUser = {
-                    name: name,
-                    id: null,
-                  };
-                  data.results.unshift(anyUser);
-                }
-              }
-              if (showEmailUser && data.results.length === 0 && query.term.match(/^[^@]+@[^@]+$/)) {
-                var trimmed = query.term.trim();
-                emailUser = {
-                  name: 'Invite "' + trimmed + '" by email',
-                  username: trimmed,
-                  id: trimmed,
-                  invite: true,
-                };
-                data.results.unshift(emailUser);
-              }
-              return query.callback(data);
+                  return query.callback(data);
+                });
+              },
+              initSelection: function() {
+                var args;
+                args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
+                return _this.initSelection.apply(_this, args);
+              },
+              formatResult: function() {
+                var args;
+                args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
+                return _this.formatResult.apply(_this, args);
+              },
+              formatSelection: function() {
+                var args;
+                args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
+                return _this.formatSelection.apply(_this, args);
+              },
+              dropdownCssClass: 'ajax-users-dropdown',
+              // we do not want to escape markup since we are displaying html in results
+              escapeMarkup: function(m) {
+                return m;
+              },
             });
-          },
-          initSelection: function() {
-            var args;
-            args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
-            return _this.initSelection.apply(_this, args);
-          },
-          formatResult: function() {
-            var args;
-            args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
-            return _this.formatResult.apply(_this, args);
-          },
-          formatSelection: function() {
-            var args;
-            args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
-            return _this.formatSelection.apply(_this, args);
-          },
-          dropdownCssClass: 'ajax-users-dropdown',
-          // we do not want to escape markup since we are displaying html in results
-          escapeMarkup: function(m) {
-            return m;
-          },
-        });
-      };
-    })(this),
-  );
+          };
+        })(this),
+      );
+    })
+    .catch(() => {});
 }
 UsersSelect.prototype.initSelection = function(element, callback) {