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angular-text-input-autocomplete

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A angular 6+ directive for adding autocomplete functionality to text input elements, built around composability

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import { Component, ElementRef, HostListener, ViewChild, ComponentFactoryResolver, Directive, EventEmitter, Injector, Input, Output, ViewContainerRef, NgModule } from '@angular/core'; import { Subject } from 'rxjs'; import getCaretCoordinates from 'textarea-caret'; import { takeUntil } from 'rxjs/operators'; import toPX from 'to-px'; import { CommonModule } from '@angular/common'; /** * @fileoverview added by tsickle * @suppress {checkTypes} checked by tsc */ class TextInputAutocompleteMenuComponent { constructor() { this.selectChoice = new Subject(); this.choiceLoading = false; this.trackById = (index, choice) => typeof choice.id !== 'undefined' ? choice.id : choice; } /** * @param {?} choices * @return {?} */ set choices(choices) { this._choices = choices; if (choices.indexOf(this.activeChoice) === -1 && choices.length > 0) { this.activeChoice = choices[0]; } } /** * @return {?} */ get choices() { return this._choices; } /** * @param {?} event * @return {?} */ onArrowDown(event) { event.preventDefault(); const /** @type {?} */ index = this.choices.indexOf(this.activeChoice); if (this.choices[index + 1]) { this.scrollToChoice(index + 1); } } /** * @param {?} event * @return {?} */ onArrowUp(event) { event.preventDefault(); const /** @type {?} */ index = this.choices.indexOf(this.activeChoice); if (this.choices[index - 1]) { this.scrollToChoice(index - 1); } } /** * @param {?} event * @return {?} */ onEnter(event) { if (this.choices.indexOf(this.activeChoice) > -1) { event.preventDefault(); this.selectChoice.next(this.activeChoice); } } /** * @param {?} index * @return {?} */ scrollToChoice(index) { this.activeChoice = this._choices[index]; if (this.dropdownMenuElement) { const /** @type {?} */ ulPosition = this.dropdownMenuElement.nativeElement.getBoundingClientRect(); const /** @type {?} */ li = this.dropdownMenuElement.nativeElement.children[index]; const /** @type {?} */ liPosition = li.getBoundingClientRect(); if (liPosition.top < ulPosition.top || liPosition.bottom > ulPosition.bottom) { li.scrollIntoView({ behavior: 'smooth', block: 'nearest' }); } } } } TextInputAutocompleteMenuComponent.decorators = [ { type: Component, args: [{ selector: 'mwl-text-input-autocomplete-menu', template: ` <ul *ngIf="choices?.length > 0" #dropdownMenu class="dropdown-menu" [style.top.px]="position?.top" [style.left.px]="position?.left"> <li *ngFor="let choice of choices; trackBy:trackById" [class.active]="activeChoice === choice"> <a href="javascript:;" (click)="selectChoice.next(choice)"> {{ choice }} </a> </li> </ul> `, styles: [ ` .dropdown-menu { display: block; max-height: 200px; overflow-y: auto; } ` ] },] }, ]; TextInputAutocompleteMenuComponent.propDecorators = { dropdownMenuElement: [{ type: ViewChild, args: ['dropdownMenu',] }], onArrowDown: [{ type: HostListener, args: ['document:keydown.ArrowDown', ['$event'],] }], onArrowUp: [{ type: HostListener, args: ['document:keydown.ArrowUp', ['$event'],] }], onEnter: [{ type: HostListener, args: ['document:keydown.Enter', ['$event'],] }] }; /** * @fileoverview added by tsickle * @suppress {checkTypes} checked by tsc */ class TextInputAutocompleteDirective { /** * @param {?} componentFactoryResolver * @param {?} viewContainerRef * @param {?} injector * @param {?} elm */ constructor(componentFactoryResolver, viewContainerRef, injector, elm) { this.componentFactoryResolver = componentFactoryResolver; this.viewContainerRef = viewContainerRef; this.injector = injector; this.elm = elm; /** * The character that will trigger the menu to appear */ this.triggerCharacter = '@'; /** * The regular expression that will match the search text after the trigger character */ this.searchRegexp = /^\w*$/; /** * Whether to close the menu when the host textarea loses focus */ this.closeMenuOnBlur = false; /** * The menu component to show with available options. * You can extend the built in `TextInputAutocompleteMenuComponent` component to use a custom template */ this.menuComponent = TextInputAutocompleteMenuComponent; /** * Called when the options menu is shown */ this.menuShown = new EventEmitter(); /** * Called when the options menu is hidden */ this.menuHidden = new EventEmitter(); /** * Called when a choice is selected */ this.choiceSelected = new EventEmitter(); /** * A function that formats the selected choice once selected. */ this.getChoiceLabel = choice => choice; this.menuHidden$ = new Subject(); this.usingShortcut = false; } /** * @param {?} key * @return {?} */ onKeypress(key) { if (key === this.triggerCharacter) { this.usingShortcut = false; this.showMenu(); } } /** * @param {?} event * @return {?} */ onKeyDown(event) { if (this.keyboardShortcut && this.keyboardShortcut(event)) { this.usingShortcut = true; this.showMenu(); this.onChange(''); } } /** * @param {?} value * @return {?} */ onChange(value) { if (this.menu) { if (value[this.menu.triggerCharacterPosition] !== this.triggerCharacter && !this.usingShortcut) { this.hideMenu(); } else { const /** @type {?} */ cursor = this.elm.nativeElement.selectionStart; if (cursor < this.menu.triggerCharacterPosition) { this.hideMenu(); } else { if (this.usingShortcut && !this.menu) { value = this.triggerCharacter; } const /** @type {?} */ offset = this.usingShortcut ? 0 : 1; const /** @type {?} */ searchText = value.slice(this.menu.triggerCharacterPosition + offset, cursor); if (!searchText.match(this.searchRegexp)) { this.hideMenu(); } else { this.menu.component.instance.searchText = searchText; this.menu.component.instance.choices = []; this.menu.component.instance.choiceLoadError = undefined; this.menu.component.instance.choiceLoading = true; this.menu.component.changeDetectorRef.detectChanges(); Promise.resolve(this.findChoices(searchText)) .then(choices => { if (this.menu) { this.menu.component.instance.choices = choices; this.menu.component.instance.choiceLoading = false; this.menu.component.changeDetectorRef.detectChanges(); } }) .catch(err => { if (this.menu) { this.menu.component.instance.choiceLoading = false; this.menu.component.instance.choiceLoadError = err; this.menu.component.changeDetectorRef.detectChanges(); } }); } } } } } /** * @return {?} */ onBlur() { if (this.menu) { this.menu.lastCaretPosition = this.elm.nativeElement.selectionStart; if (this.closeMenuOnBlur === true) { this.hideMenu(); } } } /** * @return {?} */ showMenu() { if (!this.menu) { const /** @type {?} */ menuFactory = this.componentFactoryResolver.resolveComponentFactory(this.menuComponent); this.menu = { component: this.viewContainerRef.createComponent(menuFactory, 0, this.injector), triggerCharacterPosition: this.elm.nativeElement.selectionStart }; const /** @type {?} */ lineHeight = this.getLineHeight(this.elm.nativeElement); const { top, left } = getCaretCoordinates(this.elm.nativeElement, this.elm.nativeElement.selectionStart); this.menu.component.instance.position = { top: top + lineHeight, left }; this.menu.component.changeDetectorRef.detectChanges(); this.menu.component.instance.selectChoice .pipe(takeUntil(this.menuHidden$)) .subscribe(choice => { const /** @type {?} */ label = this.getChoiceLabel(choice); const /** @type {?} */ textarea = this.elm.nativeElement; const /** @type {?} */ value = textarea.value; const /** @type {?} */ startIndex = /** @type {?} */ ((this.menu)).triggerCharacterPosition; const /** @type {?} */ start = value.slice(0, startIndex); const /** @type {?} */ caretPosition = /** @type {?} */ ((this.menu)).lastCaretPosition || textarea.selectionStart; const /** @type {?} */ end = value.slice(caretPosition); textarea.value = start + label + end; // force ng model / form control to update textarea.dispatchEvent(new Event('input')); this.hideMenu(); const /** @type {?} */ setCursorAt = (start + label).length; textarea.setSelectionRange(setCursorAt, setCursorAt); textarea.focus(); this.choiceSelected.emit({ choice, insertedAt: { start: startIndex, end: startIndex + label.length } }); }); this.menuShown.emit(); } } /** * @param {?} elm * @return {?} */ getLineHeight(elm) { const /** @type {?} */ lineHeightStr = getComputedStyle(elm).lineHeight || ''; const /** @type {?} */ fontSizeStr = getComputedStyle(elm).fontSize || ''; const /** @type {?} */ fontSize = +toPX(fontSizeStr); const /** @type {?} */ normal = 1.2; const /** @type {?} */ lineHeightNum = parseFloat(lineHeightStr); if (lineHeightStr === lineHeightNum + '') { return fontSize * lineHeightNum; } if (lineHeightStr.toLowerCase() === 'normal') { return fontSize * normal; } return toPX(lineHeightStr); } /** * @return {?} */ hideMenu() { if (this.menu) { this.menu.component.destroy(); this.menuHidden$.next(); this.menuHidden.emit(); this.menu = undefined; } } /** * @return {?} */ ngOnDestroy() { this.hideMenu(); } } TextInputAutocompleteDirective.decorators = [ { type: Directive, args: [{ selector: 'textarea[mwlTextInputAutocomplete],input[type="text"][mwlTextInputAutocomplete]' },] }, ]; /** @nocollapse */ TextInputAutocompleteDirective.ctorParameters = () => [ { type: ComponentFactoryResolver }, { type: ViewContainerRef }, { type: Injector }, { type: ElementRef } ]; TextInputAutocompleteDirective.propDecorators = { triggerCharacter: [{ type: Input }], keyboardShortcut: [{ type: Input }], searchRegexp: [{ type: Input }], closeMenuOnBlur: [{ type: Input }], menuComponent: [{ type: Input }], menuShown: [{ type: Output }], menuHidden: [{ type: Output }], choiceSelected: [{ type: Output }], findChoices: [{ type: Input }], getChoiceLabel: [{ type: Input }], onKeypress: [{ type: HostListener, args: ['keypress', ['$event.key'],] }], onKeyDown: [{ type: HostListener, args: ['keydown', ['$event'],] }], onChange: [{ type: HostListener, args: ['input', ['$event.target.value'],] }], onBlur: [{ type: HostListener, args: ['blur',] }] }; /** * @fileoverview added by tsickle * @suppress {checkTypes} checked by tsc */ class TextInputAutocompleteContainerComponent { } TextInputAutocompleteContainerComponent.decorators = [ { type: Component, args: [{ selector: 'mwl-text-input-autocomplete-container', styles: [ ` :host { position: relative; display: block; } ` ], template: '<ng-content></ng-content>' },] }, ]; /** * @fileoverview added by tsickle * @suppress {checkTypes} checked by tsc */ class TextInputAutocompleteModule { } TextInputAutocompleteModule.decorators = [ { type: NgModule, args: [{ declarations: [ TextInputAutocompleteDirective, TextInputAutocompleteContainerComponent, TextInputAutocompleteMenuComponent ], imports: [CommonModule], exports: [ TextInputAutocompleteDirective, TextInputAutocompleteContainerComponent, TextInputAutocompleteMenuComponent ], entryComponents: [TextInputAutocompleteMenuComponent] },] }, ]; /** * @fileoverview added by tsickle * @suppress {checkTypes} checked by tsc */ /** * @fileoverview added by tsickle * @suppress {checkTypes} checked by tsc */ export { TextInputAutocompleteMenuComponent, TextInputAutocompleteModule, TextInputAutocompleteContainerComponent as ɵb, TextInputAutocompleteDirective as ɵa }; //# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"angular-text-input-autocomplete.js.map","sources":["ng://angular-text-input-autocomplete/text-input-autocomplete-menu.component.ts","ng://angular-text-input-autocomplete/text-input-autocomplete.directive.ts","ng://angular-text-input-autocomplete/text-input-autocomplete-container.component.ts","ng://angular-text-input-autocomplete/text-input-autocomplete.module.ts"],"sourcesContent":["import { Component, ElementRef, HostListener, ViewChild } from '@angular/core';\nimport { Subject } from 'rxjs';\n\n@Component({\n  selector: 'mwl-text-input-autocomplete-menu',\n  template: `\n    <ul \n      *ngIf=\"choices?.length > 0\"\n      #dropdownMenu\n      class=\"dropdown-menu\"\n      [style.top.px]=\"position?.top\"\n      [style.left.px]=\"position?.left\">\n      <li\n        *ngFor=\"let choice of choices; trackBy:trackById\"\n        [class.active]=\"activeChoice === choice\">\n        <a\n          href=\"javascript:;\"\n          (click)=\"selectChoice.next(choice)\">\n          {{ choice }}\n        </a>\n      </li>\n    </ul>\n  `,\n  styles: [\n    `\n      .dropdown-menu {\n        display: block;\n        max-height: 200px;\n        overflow-y: auto;\n      }\n    `\n  ]\n})\nexport class TextInputAutocompleteMenuComponent {\n  @ViewChild('dropdownMenu') dropdownMenuElement: ElementRef<HTMLUListElement>;\n  position: { top: number; left: number };\n  selectChoice = new Subject();\n  activeChoice: any;\n  searchText: string;\n  choiceLoadError: any;\n  choiceLoading = false;\n  private _choices: any[];\n  trackById = (index: number, choice: any) =>\n    typeof choice.id !== 'undefined' ? choice.id : choice;\n\n  set choices(choices: any[]) {\n    this._choices = choices;\n    if (choices.indexOf(this.activeChoice) === -1 && choices.length > 0) {\n      this.activeChoice = choices[0];\n    }\n  }\n\n  get choices() {\n    return this._choices;\n  }\n\n  @HostListener('document:keydown.ArrowDown', ['$event'])\n  onArrowDown(event: KeyboardEvent) {\n    event.preventDefault();\n    const index = this.choices.indexOf(this.activeChoice);\n    if (this.choices[index + 1]) {\n      this.scrollToChoice(index + 1);\n    }\n  }\n\n  @HostListener('document:keydown.ArrowUp', ['$event'])\n  onArrowUp(event: KeyboardEvent) {\n    event.preventDefault();\n    const index = this.choices.indexOf(this.activeChoice);\n    if (this.choices[index - 1]) {\n      this.scrollToChoice(index - 1);\n    }\n  }\n\n  @HostListener('document:keydown.Enter', ['$event'])\n  onEnter(event: KeyboardEvent) {\n    if (this.choices.indexOf(this.activeChoice) > -1) {\n      event.preventDefault();\n      this.selectChoice.next(this.activeChoice);\n    }\n  }\n\n  private scrollToChoice(index: number) {\n    this.activeChoice = this._choices[index];\n\n    if (this.dropdownMenuElement) {\n      const ulPosition = this.dropdownMenuElement.nativeElement.getBoundingClientRect();\n      const li = this.dropdownMenuElement.nativeElement.children[index];\n      const liPosition = li.getBoundingClientRect();\n\n      if (\n        liPosition.top < ulPosition.top ||\n        liPosition.bottom > ulPosition.bottom\n      ) {\n        li.scrollIntoView({\n          behavior: 'smooth',\n          block: 'nearest'\n        });\n      }\n    }\n  }\n}\n","import {\n  ComponentFactoryResolver,\n  ComponentRef,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  HostListener,\n  Injector,\n  Input,\n  OnDestroy,\n  Output,\n  ViewContainerRef\n} from '@angular/core';\nimport getCaretCoordinates from 'textarea-caret';\nimport { takeUntil } from 'rxjs/operators';\nimport { TextInputAutocompleteMenuComponent } from './text-input-autocomplete-menu.component';\nimport { Subject } from 'rxjs';\n// @ts-ignore\nimport toPX from 'to-px';\n\nexport interface ChoiceSelectedEvent {\n  choice: any;\n  insertedAt: {\n    start: number;\n    end: number;\n  };\n}\n\n@Directive({\n  selector:\n    'textarea[mwlTextInputAutocomplete],input[type=\"text\"][mwlTextInputAutocomplete]'\n})\nexport class TextInputAutocompleteDirective implements OnDestroy {\n  /**\n   * The character that will trigger the menu to appear\n   */\n  @Input() triggerCharacter = '@';\n\n  /**\n   * An optional keyboard shortcut that will trigger the menu to appear\n   */\n  @Input() keyboardShortcut: (event: KeyboardEvent) => boolean;\n\n  /**\n   * The regular expression that will match the search text after the trigger character\n   */\n  @Input() searchRegexp = /^\\w*$/;\n\n  /**\n   * Whether to close the menu when the host textarea loses focus\n   */\n  @Input() closeMenuOnBlur = false;\n\n  /**\n   * The menu component to show with available options.\n   * You can extend the built in `TextInputAutocompleteMenuComponent` component to use a custom template\n   */\n  @Input() menuComponent = TextInputAutocompleteMenuComponent;\n\n  /**\n   * Called when the options menu is shown\n   */\n  @Output() menuShown = new EventEmitter();\n\n  /**\n   * Called when the options menu is hidden\n   */\n  @Output() menuHidden = new EventEmitter();\n\n  /**\n   * Called when a choice is selected\n   */\n  @Output() choiceSelected = new EventEmitter<ChoiceSelectedEvent>();\n\n  /**\n   * A function that accepts a search string and returns an array of choices. Can also return a promise.\n   */\n  @Input() findChoices: (searchText: string) => any[] | Promise<any[]>;\n\n  /**\n   * A function that formats the selected choice once selected.\n   */\n  @Input() getChoiceLabel: (choice: any) => string = choice => choice;\n\n  /* tslint:disable member-ordering */\n  private menu:\n    | {\n        component: ComponentRef<TextInputAutocompleteMenuComponent>;\n        triggerCharacterPosition: number;\n        lastCaretPosition?: number;\n      }\n    | undefined;\n\n  private menuHidden$ = new Subject();\n\n  private usingShortcut = false;\n\n  constructor(\n    private componentFactoryResolver: ComponentFactoryResolver,\n    private viewContainerRef: ViewContainerRef,\n    private injector: Injector,\n    private elm: ElementRef\n  ) {}\n\n  @HostListener('keypress', ['$event.key'])\n  onKeypress(key: string) {\n    if (key === this.triggerCharacter) {\n      this.usingShortcut = false;\n      this.showMenu();\n    }\n  }\n\n  @HostListener('keydown', ['$event'])\n  onKeyDown(event: KeyboardEvent) {\n    if (this.keyboardShortcut && this.keyboardShortcut(event)) {\n      this.usingShortcut = true;\n      this.showMenu();\n      this.onChange('');\n    }\n  }\n\n  @HostListener('input', ['$event.target.value'])\n  onChange(value: string) {\n    if (this.menu) {\n      if (\n        value[this.menu.triggerCharacterPosition] !== this.triggerCharacter &&\n        !this.usingShortcut\n      ) {\n        this.hideMenu();\n      } else {\n        const cursor = this.elm.nativeElement.selectionStart;\n        if (cursor < this.menu.triggerCharacterPosition) {\n          this.hideMenu();\n        } else {\n          if (this.usingShortcut && !this.menu) {\n            value = this.triggerCharacter;\n          }\n          const offset = this.usingShortcut ? 0 : 1;\n          const searchText = value.slice(\n            this.menu.triggerCharacterPosition + offset,\n            cursor\n          );\n\n          if (!searchText.match(this.searchRegexp)) {\n            this.hideMenu();\n          } else {\n            this.menu.component.instance.searchText = searchText;\n            this.menu.component.instance.choices = [];\n            this.menu.component.instance.choiceLoadError = undefined;\n            this.menu.component.instance.choiceLoading = true;\n            this.menu.component.changeDetectorRef.detectChanges();\n            Promise.resolve(this.findChoices(searchText))\n              .then(choices => {\n                if (this.menu) {\n                  this.menu.component.instance.choices = choices;\n                  this.menu.component.instance.choiceLoading = false;\n                  this.menu.component.changeDetectorRef.detectChanges();\n                }\n              })\n              .catch(err => {\n                if (this.menu) {\n                  this.menu.component.instance.choiceLoading = false;\n                  this.menu.component.instance.choiceLoadError = err;\n                  this.menu.component.changeDetectorRef.detectChanges();\n                }\n              });\n          }\n        }\n      }\n    }\n  }\n\n  @HostListener('blur')\n  onBlur() {\n    if (this.menu) {\n      this.menu.lastCaretPosition = this.elm.nativeElement.selectionStart;\n\n      if (this.closeMenuOnBlur === true) {\n        this.hideMenu();\n      }\n    }\n  }\n\n  private showMenu() {\n    if (!this.menu) {\n      const menuFactory = this.componentFactoryResolver.resolveComponentFactory<\n        TextInputAutocompleteMenuComponent\n      >(this.menuComponent);\n      this.menu = {\n        component: this.viewContainerRef.createComponent(\n          menuFactory,\n          0,\n          this.injector\n        ),\n        triggerCharacterPosition: this.elm.nativeElement.selectionStart\n      };\n\n      const lineHeight = this.getLineHeight(this.elm.nativeElement);\n      const { top, left } = getCaretCoordinates(\n        this.elm.nativeElement,\n        this.elm.nativeElement.selectionStart\n      );\n      this.menu.component.instance.position = {\n        top: top + lineHeight,\n        left\n      };\n      this.menu.component.changeDetectorRef.detectChanges();\n      this.menu.component.instance.selectChoice\n        .pipe(takeUntil(this.menuHidden$))\n        .subscribe(choice => {\n          const label = this.getChoiceLabel(choice);\n          const textarea: HTMLTextAreaElement = this.elm.nativeElement;\n          const value: string = textarea.value;\n          const startIndex = this.menu!.triggerCharacterPosition;\n          const start = value.slice(0, startIndex);\n          const caretPosition =\n            this.menu!.lastCaretPosition || textarea.selectionStart;\n          const end = value.slice(caretPosition);\n          textarea.value = start + label + end;\n          // force ng model / form control to update\n          textarea.dispatchEvent(new Event('input'));\n          this.hideMenu();\n          const setCursorAt = (start + label).length;\n          textarea.setSelectionRange(setCursorAt, setCursorAt);\n          textarea.focus();\n          this.choiceSelected.emit({\n            choice,\n            insertedAt: {\n              start: startIndex,\n              end: startIndex + label.length\n            }\n          });\n        });\n      this.menuShown.emit();\n    }\n  }\n\n  getLineHeight(elm: HTMLElement): number {\n    const lineHeightStr = getComputedStyle(elm).lineHeight || '';\n    const fontSizeStr = getComputedStyle(elm).fontSize || '';\n    const fontSize = +toPX(fontSizeStr);\n    const normal = 1.2;\n    const lineHeightNum = parseFloat(lineHeightStr);\n\n    if (lineHeightStr === lineHeightNum + '') {\n      return fontSize * lineHeightNum;\n    }\n\n    if (lineHeightStr.toLowerCase() === 'normal') {\n      return fontSize * normal;\n    }\n\n    return toPX(lineHeightStr);\n  }\n\n  private hideMenu() {\n    if (this.menu) {\n      this.menu.component.destroy();\n      this.menuHidden$.next();\n      this.menuHidden.emit();\n      this.menu = undefined;\n    }\n  }\n\n  ngOnDestroy() {\n    this.hideMenu();\n  }\n}\n","import { Component } from '@angular/core';\n\n@Component({\n  selector: 'mwl-text-input-autocomplete-container',\n  styles: [\n    `\n      :host {\n        position: relative;\n        display: block;\n      }\n    `\n  ],\n  template: '<ng-content></ng-content>'\n})\nexport class TextInputAutocompleteContainerComponent {}\n","import { NgModule } from '@angular/core';\nimport { CommonModule } from '@angular/common';\nimport { TextInputAutocompleteDirective } from './text-input-autocomplete.directive';\nimport { TextInputAutocompleteContainerComponent } from './text-input-autocomplete-container.component';\nimport { TextInputAutocompleteMenuComponent } from './text-input-autocomplete-menu.component';\n\n@NgModule({\n  declarations: [\n    TextInputAutocompleteDirective,\n    TextInputAutocompleteContainerComponent,\n    TextInputAutocompleteMenuComponent\n  ],\n  imports: [CommonModule],\n  exports: [\n    TextInputAutocompleteDirective,\n    TextInputAutocompleteContainerComponent,\n    TextInputAutocompleteMenuComponent\n  ],\n  entryComponents: [TextInputAutocompleteMenuComponent]\n})\nexport class TextInputAutocompleteModule 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