@angular/forms
Version:
Angular - directives and services for creating forms
347 lines • 51.7 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { InjectionToken, ɵRuntimeError as RuntimeError } from '@angular/core';
import { getControlAsyncValidators, getControlValidators, mergeValidators } from '../validators';
import { BuiltInControlValueAccessor } from './control_value_accessor';
import { DefaultValueAccessor } from './default_value_accessor';
import { ngModelWarning } from './reactive_errors';
/**
* Token to provide to allow SetDisabledState to always be called when a CVA is added, regardless of
* whether the control is disabled or enabled.
*
* @see `FormsModule.withConfig`
*/
export const CALL_SET_DISABLED_STATE = new InjectionToken('CallSetDisabledState', { providedIn: 'root', factory: () => setDisabledStateDefault });
/**
* Whether to use the fixed setDisabledState behavior by default.
*/
export const setDisabledStateDefault = 'always';
export function controlPath(name, parent) {
return [...parent.path, name];
}
/**
* Links a Form control and a Form directive by setting up callbacks (such as `onChange`) on both
* instances. This function is typically invoked when form directive is being initialized.
*
* @param control Form control instance that should be linked.
* @param dir Directive that should be linked with a given control.
*/
export function setUpControl(control, dir, callSetDisabledState = setDisabledStateDefault) {
if (typeof ngDevMode === 'undefined' || ngDevMode) {
if (!control)
_throwError(dir, 'Cannot find control with');
if (!dir.valueAccessor)
_throwMissingValueAccessorError(dir);
}
setUpValidators(control, dir);
dir.valueAccessor.writeValue(control.value);
// The legacy behavior only calls the CVA's `setDisabledState` if the control is disabled.
// If the `callSetDisabledState` option is set to `always`, then this bug is fixed and
// the method is always called.
if (control.disabled || callSetDisabledState === 'always') {
dir.valueAccessor.setDisabledState?.(control.disabled);
}
setUpViewChangePipeline(control, dir);
setUpModelChangePipeline(control, dir);
setUpBlurPipeline(control, dir);
setUpDisabledChangeHandler(control, dir);
}
/**
* Reverts configuration performed by the `setUpControl` control function.
* Effectively disconnects form control with a given form directive.
* This function is typically invoked when corresponding form directive is being destroyed.
*
* @param control Form control which should be cleaned up.
* @param dir Directive that should be disconnected from a given control.
* @param validateControlPresenceOnChange Flag that indicates whether onChange handler should
* contain asserts to verify that it's not called once directive is destroyed. We need this flag
* to avoid potentially breaking changes caused by better control cleanup introduced in #39235.
*/
export function cleanUpControl(control, dir, validateControlPresenceOnChange = true) {
const noop = () => {
if (validateControlPresenceOnChange && (typeof ngDevMode === 'undefined' || ngDevMode)) {
_noControlError(dir);
}
};
// The `valueAccessor` field is typically defined on FromControl and FormControlName directive
// instances and there is a logic in `selectValueAccessor` function that throws if it's not the
// case. We still check the presence of `valueAccessor` before invoking its methods to make sure
// that cleanup works correctly if app code or tests are setup to ignore the error thrown from
// `selectValueAccessor`. See https://github.com/angular/angular/issues/40521.
if (dir.valueAccessor) {
dir.valueAccessor.registerOnChange(noop);
dir.valueAccessor.registerOnTouched(noop);
}
cleanUpValidators(control, dir);
if (control) {
dir._invokeOnDestroyCallbacks();
control._registerOnCollectionChange(() => { });
}
}
function registerOnValidatorChange(validators, onChange) {
validators.forEach((validator) => {
if (validator.registerOnValidatorChange)
validator.registerOnValidatorChange(onChange);
});
}
/**
* Sets up disabled change handler function on a given form control if ControlValueAccessor
* associated with a given directive instance supports the `setDisabledState` call.
*
* @param control Form control where disabled change handler should be setup.
* @param dir Corresponding directive instance associated with this control.
*/
export function setUpDisabledChangeHandler(control, dir) {
if (dir.valueAccessor.setDisabledState) {
const onDisabledChange = (isDisabled) => {
dir.valueAccessor.setDisabledState(isDisabled);
};
control.registerOnDisabledChange(onDisabledChange);
// Register a callback function to cleanup disabled change handler
// from a control instance when a directive is destroyed.
dir._registerOnDestroy(() => {
control._unregisterOnDisabledChange(onDisabledChange);
});
}
}
/**
* Sets up sync and async directive validators on provided form control.
* This function merges validators from the directive into the validators of the control.
*
* @param control Form control where directive validators should be setup.
* @param dir Directive instance that contains validators to be setup.
*/
export function setUpValidators(control, dir) {
const validators = getControlValidators(control);
if (dir.validator !== null) {
control.setValidators(mergeValidators(validators, dir.validator));
}
else if (typeof validators === 'function') {
// If sync validators are represented by a single validator function, we force the
// `Validators.compose` call to happen by executing the `setValidators` function with
// an array that contains that function. We need this to avoid possible discrepancies in
// validators behavior, so sync validators are always processed by the `Validators.compose`.
// Note: we should consider moving this logic inside the `setValidators` function itself, so we
// have consistent behavior on AbstractControl API level. The same applies to the async
// validators logic below.
control.setValidators([validators]);
}
const asyncValidators = getControlAsyncValidators(control);
if (dir.asyncValidator !== null) {
control.setAsyncValidators(mergeValidators(asyncValidators, dir.asyncValidator));
}
else if (typeof asyncValidators === 'function') {
control.setAsyncValidators([asyncValidators]);
}
// Re-run validation when validator binding changes, e.g. minlength=3 -> minlength=4
const onValidatorChange = () => control.updateValueAndValidity();
registerOnValidatorChange(dir._rawValidators, onValidatorChange);
registerOnValidatorChange(dir._rawAsyncValidators, onValidatorChange);
}
/**
* Cleans up sync and async directive validators on provided form control.
* This function reverts the setup performed by the `setUpValidators` function, i.e.
* removes directive-specific validators from a given control instance.
*
* @param control Form control from where directive validators should be removed.
* @param dir Directive instance that contains validators to be removed.
* @returns true if a control was updated as a result of this action.
*/
export function cleanUpValidators(control, dir) {
let isControlUpdated = false;
if (control !== null) {
if (dir.validator !== null) {
const validators = getControlValidators(control);
if (Array.isArray(validators) && validators.length > 0) {
// Filter out directive validator function.
const updatedValidators = validators.filter((validator) => validator !== dir.validator);
if (updatedValidators.length !== validators.length) {
isControlUpdated = true;
control.setValidators(updatedValidators);
}
}
}
if (dir.asyncValidator !== null) {
const asyncValidators = getControlAsyncValidators(control);
if (Array.isArray(asyncValidators) && asyncValidators.length > 0) {
// Filter out directive async validator function.
const updatedAsyncValidators = asyncValidators.filter((asyncValidator) => asyncValidator !== dir.asyncValidator);
if (updatedAsyncValidators.length !== asyncValidators.length) {
isControlUpdated = true;
control.setAsyncValidators(updatedAsyncValidators);
}
}
}
}
// Clear onValidatorChange callbacks by providing a noop function.
const noop = () => { };
registerOnValidatorChange(dir._rawValidators, noop);
registerOnValidatorChange(dir._rawAsyncValidators, noop);
return isControlUpdated;
}
function setUpViewChangePipeline(control, dir) {
dir.valueAccessor.registerOnChange((newValue) => {
control._pendingValue = newValue;
control._pendingChange = true;
control._pendingDirty = true;
if (control.updateOn === 'change')
updateControl(control, dir);
});
}
function setUpBlurPipeline(control, dir) {
dir.valueAccessor.registerOnTouched(() => {
control._pendingTouched = true;
if (control.updateOn === 'blur' && control._pendingChange)
updateControl(control, dir);
if (control.updateOn !== 'submit')
control.markAsTouched();
});
}
function updateControl(control, dir) {
if (control._pendingDirty)
control.markAsDirty();
control.setValue(control._pendingValue, { emitModelToViewChange: false });
dir.viewToModelUpdate(control._pendingValue);
control._pendingChange = false;
}
function setUpModelChangePipeline(control, dir) {
const onChange = (newValue, emitModelEvent) => {
// control -> view
dir.valueAccessor.writeValue(newValue);
// control -> ngModel
if (emitModelEvent)
dir.viewToModelUpdate(newValue);
};
control.registerOnChange(onChange);
// Register a callback function to cleanup onChange handler
// from a control instance when a directive is destroyed.
dir._registerOnDestroy(() => {
control._unregisterOnChange(onChange);
});
}
/**
* Links a FormGroup or FormArray instance and corresponding Form directive by setting up validators
* present in the view.
*
* @param control FormGroup or FormArray instance that should be linked.
* @param dir Directive that provides view validators.
*/
export function setUpFormContainer(control, dir) {
if (control == null && (typeof ngDevMode === 'undefined' || ngDevMode))
_throwError(dir, 'Cannot find control with');
setUpValidators(control, dir);
}
/**
* Reverts the setup performed by the `setUpFormContainer` function.
*
* @param control FormGroup or FormArray instance that should be cleaned up.
* @param dir Directive that provided view validators.
* @returns true if a control was updated as a result of this action.
*/
export function cleanUpFormContainer(control, dir) {
return cleanUpValidators(control, dir);
}
function _noControlError(dir) {
return _throwError(dir, 'There is no FormControl instance attached to form control element with');
}
function _throwError(dir, message) {
const messageEnd = _describeControlLocation(dir);
throw new Error(`${message} ${messageEnd}`);
}
function _describeControlLocation(dir) {
const path = dir.path;
if (path && path.length > 1)
return `path: '${path.join(' -> ')}'`;
if (path?.[0])
return `name: '${path}'`;
return 'unspecified name attribute';
}
function _throwMissingValueAccessorError(dir) {
const loc = _describeControlLocation(dir);
throw new RuntimeError(-1203 /* RuntimeErrorCode.NG_MISSING_VALUE_ACCESSOR */, `No value accessor for form control ${loc}.`);
}
function _throwInvalidValueAccessorError(dir) {
const loc = _describeControlLocation(dir);
throw new RuntimeError(1200 /* RuntimeErrorCode.NG_VALUE_ACCESSOR_NOT_PROVIDED */, `Value accessor was not provided as an array for form control with ${loc}. ` +
`Check that the \`NG_VALUE_ACCESSOR\` token is configured as a \`multi: true\` provider.`);
}
export function isPropertyUpdated(changes, viewModel) {
if (!changes.hasOwnProperty('model'))
return false;
const change = changes['model'];
if (change.isFirstChange())
return true;
return !Object.is(viewModel, change.currentValue);
}
export function isBuiltInAccessor(valueAccessor) {
// Check if a given value accessor is an instance of a class that directly extends
// `BuiltInControlValueAccessor` one.
return Object.getPrototypeOf(valueAccessor.constructor) === BuiltInControlValueAccessor;
}
export function syncPendingControls(form, directives) {
form._syncPendingControls();
directives.forEach((dir) => {
const control = dir.control;
if (control.updateOn === 'submit' && control._pendingChange) {
dir.viewToModelUpdate(control._pendingValue);
control._pendingChange = false;
}
});
}
// TODO: vsavkin remove it once https://github.com/angular/angular/issues/3011 is implemented
export function selectValueAccessor(dir, valueAccessors) {
if (!valueAccessors)
return null;
if (!Array.isArray(valueAccessors) && (typeof ngDevMode === 'undefined' || ngDevMode))
_throwInvalidValueAccessorError(dir);
let defaultAccessor = undefined;
let builtinAccessor = undefined;
let customAccessor = undefined;
valueAccessors.forEach((v) => {
if (v.constructor === DefaultValueAccessor) {
defaultAccessor = v;
}
else if (isBuiltInAccessor(v)) {
if (builtinAccessor && (typeof ngDevMode === 'undefined' || ngDevMode))
_throwError(dir, 'More than one built-in value accessor matches form control with');
builtinAccessor = v;
}
else {
if (customAccessor && (typeof ngDevMode === 'undefined' || ngDevMode))
_throwError(dir, 'More than one custom value accessor matches form control with');
customAccessor = v;
}
});
if (customAccessor)
return customAccessor;
if (builtinAccessor)
return builtinAccessor;
if (defaultAccessor)
return defaultAccessor;
if (typeof ngDevMode === 'undefined' || ngDevMode) {
_throwError(dir, 'No valid value accessor for form control with');
}
return null;
}
export function removeListItem(list, el) {
const index = list.indexOf(el);
if (index > -1)
list.splice(index, 1);
}
// TODO(kara): remove after deprecation period
export function _ngModelWarning(name, type, instance, warningConfig) {
if (warningConfig === 'never')
return;
if (((warningConfig === null || warningConfig === 'once') && !type._ngModelWarningSentOnce) ||
(warningConfig === 'always' && !instance._ngModelWarningSent)) {
console.warn(ngModelWarning(name));
type._ngModelWarningSentOnce = true;
instance._ngModelWarningSent = true;
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Inject, InjectionToken, ɵRuntimeError as RuntimeError} from '@angular/core';\n\nimport {RuntimeErrorCode} from '../errors';\nimport {AbstractControl} from '../model/abstract_model';\nimport {FormArray} from '../model/form_array';\nimport {FormControl} from '../model/form_control';\nimport {FormGroup} from '../model/form_group';\nimport {getControlAsyncValidators, getControlValidators, mergeValidators} from '../validators';\n\nimport {AbstractControlDirective} from './abstract_control_directive';\nimport {AbstractFormGroupDirective} from './abstract_form_group_directive';\nimport {ControlContainer} from './control_container';\nimport {BuiltInControlValueAccessor, ControlValueAccessor} from './control_value_accessor';\nimport {DefaultValueAccessor} from './default_value_accessor';\nimport {NgControl} from './ng_control';\nimport {FormArrayName} from './reactive_directives/form_group_name';\nimport {ngModelWarning} from './reactive_errors';\nimport {AsyncValidatorFn, Validator, ValidatorFn} from './validators';\n\n/**\n * Token to provide to allow SetDisabledState to always be called when a CVA is added, regardless of\n * whether the control is disabled or enabled.\n *\n * @see `FormsModule.withConfig`\n */\nexport const CALL_SET_DISABLED_STATE = new InjectionToken(\n    'CallSetDisabledState', {providedIn: 'root', factory: () => setDisabledStateDefault});\n\n/**\n * The type for CALL_SET_DISABLED_STATE. If `always`, then ControlValueAccessor will always call\n * `setDisabledState` when attached, which is the most correct behavior. Otherwise, it will only be\n * called when disabled, which is the legacy behavior for compatibility.\n *\n * @publicApi\n * @see `FormsModule.withConfig`\n */\nexport type SetDisabledStateOption = 'whenDisabledForLegacyCode'|'always';\n\n/**\n * Whether to use the fixed setDisabledState behavior by default.\n */\nexport const setDisabledStateDefault: SetDisabledStateOption = 'always';\n\nexport function controlPath(name: string|null, parent: ControlContainer): string[] {\n  return [...parent.path!, name!];\n}\n\n/**\n * Links a Form control and a Form directive by setting up callbacks (such as `onChange`) on both\n * instances. This function is typically invoked when form directive is being initialized.\n *\n * @param control Form control instance that should be linked.\n * @param dir Directive that should be linked with a given control.\n */\nexport function setUpControl(\n    control: FormControl, dir: NgControl,\n    callSetDisabledState: SetDisabledStateOption = setDisabledStateDefault): void {\n  if (typeof ngDevMode === 'undefined' || ngDevMode) {\n    if (!control) _throwError(dir, 'Cannot find control with');\n    if (!dir.valueAccessor) _throwMissingValueAccessorError(dir);\n  }\n\n  setUpValidators(control, dir);\n\n  dir.valueAccessor!.writeValue(control.value);\n\n  // The legacy behavior only calls the CVA's `setDisabledState` if the control is disabled.\n  // If the `callSetDisabledState` option is set to `always`, then this bug is fixed and\n  // the method is always called.\n  if (control.disabled || callSetDisabledState === 'always') {\n    dir.valueAccessor!.setDisabledState?.(control.disabled);\n  }\n\n  setUpViewChangePipeline(control, dir);\n  setUpModelChangePipeline(control, dir);\n\n  setUpBlurPipeline(control, dir);\n\n  setUpDisabledChangeHandler(control, dir);\n}\n\n/**\n * Reverts configuration performed by the `setUpControl` control function.\n * Effectively disconnects form control with a given form directive.\n * This function is typically invoked when corresponding form directive is being destroyed.\n *\n * @param control Form control which should be cleaned up.\n * @param dir Directive that should be disconnected from a given control.\n * @param validateControlPresenceOnChange Flag that indicates whether onChange handler should\n *     contain asserts to verify that it's not called once directive is destroyed. We need this flag\n *     to avoid potentially breaking changes caused by better control cleanup introduced in #39235.\n */\nexport function cleanUpControl(\n    control: FormControl|null, dir: NgControl,\n    validateControlPresenceOnChange: boolean = true): void {\n  const noop = () => {\n    if (validateControlPresenceOnChange && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      _noControlError(dir);\n    }\n  };\n\n  // The `valueAccessor` field is typically defined on FromControl and FormControlName directive\n  // instances and there is a logic in `selectValueAccessor` function that throws if it's not the\n  // case. We still check the presence of `valueAccessor` before invoking its methods to make sure\n  // that cleanup works correctly if app code or tests are setup to ignore the error thrown from\n  // `selectValueAccessor`. See https://github.com/angular/angular/issues/40521.\n  if (dir.valueAccessor) {\n    dir.valueAccessor.registerOnChange(noop);\n    dir.valueAccessor.registerOnTouched(noop);\n  }\n\n  cleanUpValidators(control, dir);\n\n  if (control) {\n    dir._invokeOnDestroyCallbacks();\n    control._registerOnCollectionChange(() => {});\n  }\n}\n\nfunction registerOnValidatorChange<V>(validators: (V|Validator)[], onChange: () => void): void {\n  validators.forEach((validator: V|Validator) => {\n    if ((<Validator>validator).registerOnValidatorChange)\n      (<Validator>validator).registerOnValidatorChange!(onChange);\n  });\n}\n\n/**\n * Sets up disabled change handler function on a given form control if ControlValueAccessor\n * associated with a given directive instance supports the `setDisabledState` call.\n *\n * @param control Form control where disabled change handler should be setup.\n * @param dir Corresponding directive instance associated with this control.\n */\nexport function setUpDisabledChangeHandler(control: FormControl, dir: NgControl): void {\n  if (dir.valueAccessor!.setDisabledState) {\n    const onDisabledChange = (isDisabled: boolean) => {\n      dir.valueAccessor!.setDisabledState!(isDisabled);\n    };\n    control.registerOnDisabledChange(onDisabledChange);\n\n    // Register a callback function to cleanup disabled change handler\n    // from a control instance when a directive is destroyed.\n    dir._registerOnDestroy(() => {\n      control._unregisterOnDisabledChange(onDisabledChange);\n    });\n  }\n}\n\n/**\n * Sets up sync and async directive validators on provided form control.\n * This function merges validators from the directive into the validators of the control.\n *\n * @param control Form control where directive validators should be setup.\n * @param dir Directive instance that contains validators to be setup.\n */\nexport function setUpValidators(control: AbstractControl, dir: AbstractControlDirective): void {\n  const validators = getControlValidators(control);\n  if (dir.validator !== null) {\n    control.setValidators(mergeValidators<ValidatorFn>(validators, dir.validator));\n  } else if (typeof validators === 'function') {\n    // If sync validators are represented by a single validator function, we force the\n    // `Validators.compose` call to happen by executing the `setValidators` function with\n    // an array that contains that function. We need this to avoid possible discrepancies in\n    // validators behavior, so sync validators are always processed by the `Validators.compose`.\n    // Note: we should consider moving this logic inside the `setValidators` function itself, so we\n    // have consistent behavior on AbstractControl API level. The same applies to the async\n    // validators logic below.\n    control.setValidators([validators]);\n  }\n\n  const asyncValidators = getControlAsyncValidators(control);\n  if (dir.asyncValidator !== null) {\n    control.setAsyncValidators(\n        mergeValidators<AsyncValidatorFn>(asyncValidators, dir.asyncValidator));\n  } else if (typeof asyncValidators === 'function') {\n    control.setAsyncValidators([asyncValidators]);\n  }\n\n  // Re-run validation when validator binding changes, e.g. minlength=3 -> minlength=4\n  const onValidatorChange = () => control.updateValueAndValidity();\n  registerOnValidatorChange<ValidatorFn>(dir._rawValidators, onValidatorChange);\n  registerOnValidatorChange<AsyncValidatorFn>(dir._rawAsyncValidators, onValidatorChange);\n}\n\n/**\n * Cleans up sync and async directive validators on provided form control.\n * This function reverts the setup performed by the `setUpValidators` function, i.e.\n * removes directive-specific validators from a given control instance.\n *\n * @param control Form control from where directive validators should be removed.\n * @param dir Directive instance that contains validators to be removed.\n * @returns true if a control was updated as a result of this action.\n */\nexport function cleanUpValidators(\n    control: AbstractControl|null, dir: AbstractControlDirective): boolean {\n  let isControlUpdated = false;\n  if (control !== null) {\n    if (dir.validator !== null) {\n      const validators = getControlValidators(control);\n      if (Array.isArray(validators) && validators.length > 0) {\n        // Filter out directive validator function.\n        const updatedValidators = validators.filter((validator) => validator !== dir.validator);\n        if (updatedValidators.length !== validators.length) {\n          isControlUpdated = true;\n          control.setValidators(updatedValidators);\n        }\n      }\n    }\n\n    if (dir.asyncValidator !== null) {\n      const asyncValidators = getControlAsyncValidators(control);\n      if (Array.isArray(asyncValidators) && asyncValidators.length > 0) {\n        // Filter out directive async validator function.\n        const updatedAsyncValidators =\n            asyncValidators.filter((asyncValidator) => asyncValidator !== dir.asyncValidator);\n        if (updatedAsyncValidators.length !== asyncValidators.length) {\n          isControlUpdated = true;\n          control.setAsyncValidators(updatedAsyncValidators);\n        }\n      }\n    }\n  }\n\n  // Clear onValidatorChange callbacks by providing a noop function.\n  const noop = () => {};\n  registerOnValidatorChange<ValidatorFn>(dir._rawValidators, noop);\n  registerOnValidatorChange<AsyncValidatorFn>(dir._rawAsyncValidators, noop);\n\n  return isControlUpdated;\n}\n\nfunction setUpViewChangePipeline(control: FormControl, dir: NgControl): void {\n  dir.valueAccessor!.registerOnChange((newValue: any) => {\n    control._pendingValue = newValue;\n    control._pendingChange = true;\n    control._pendingDirty = true;\n\n    if (control.updateOn === 'change') updateControl(control, dir);\n  });\n}\n\nfunction setUpBlurPipeline(control: FormControl, dir: NgControl): void {\n  dir.valueAccessor!.registerOnTouched(() => {\n    control._pendingTouched = true;\n\n    if (control.updateOn === 'blur' && control._pendingChange) updateControl(control, dir);\n    if (control.updateOn !== 'submit') control.markAsTouched();\n  });\n}\n\nfunction updateControl(control: FormControl, dir: NgControl): void {\n  if (control._pendingDirty) control.markAsDirty();\n  control.setValue(control._pendingValue, {emitModelToViewChange: false});\n  dir.viewToModelUpdate(control._pendingValue);\n  control._pendingChange = false;\n}\n\nfunction setUpModelChangePipeline(control: FormControl, dir: NgControl): void {\n  const onChange = (newValue?: any, emitModelEvent?: boolean) => {\n    // control -> view\n    dir.valueAccessor!.writeValue(newValue);\n\n    // control -> ngModel\n    if (emitModelEvent) dir.viewToModelUpdate(newValue);\n  };\n  control.registerOnChange(onChange);\n\n  // Register a callback function to cleanup onChange handler\n  // from a control instance when a directive is destroyed.\n  dir._registerOnDestroy(() => {\n    control._unregisterOnChange(onChange);\n  });\n}\n\n/**\n * Links a FormGroup or FormArray instance and corresponding Form directive by setting up validators\n * present in the view.\n *\n * @param control FormGroup or FormArray instance that should be linked.\n * @param dir Directive that provides view validators.\n */\nexport function setUpFormContainer(\n    control: FormGroup|FormArray, dir: AbstractFormGroupDirective|FormArrayName) {\n  if (control == null && (typeof ngDevMode === 'undefined' || ngDevMode))\n    _throwError(dir, 'Cannot find control with');\n  setUpValidators(control, dir);\n}\n\n/**\n * Reverts the setup performed by the `setUpFormContainer` function.\n *\n * @param control FormGroup or FormArray instance that should be cleaned up.\n * @param dir Directive that provided view validators.\n * @returns true if a control was updated as a result of this action.\n */\nexport function cleanUpFormContainer(\n    control: FormGroup|FormArray, dir: AbstractFormGroupDirective|FormArrayName): boolean {\n  return cleanUpValidators(control, dir);\n}\n\nfunction _noControlError(dir: NgControl) {\n  return _throwError(dir, 'There is no FormControl instance attached to form control element with');\n}\n\nfunction _throwError(dir: AbstractControlDirective, message: string): void {\n  const messageEnd = _describeControlLocation(dir);\n  throw new Error(`${message} ${messageEnd}`);\n}\n\nfunction _describeControlLocation(dir: AbstractControlDirective): string {\n  const path = dir.path;\n  if (path && path.length > 1) return `path: '${path.join(' -> ')}'`;\n  if (path?.[0]) return `name: '${path}'`;\n  return 'unspecified name attribute';\n}\n\nfunction _throwMissingValueAccessorError(dir: AbstractControlDirective) {\n  const loc = _describeControlLocation(dir);\n  throw new RuntimeError(\n      RuntimeErrorCode.NG_MISSING_VALUE_ACCESSOR, `No value accessor for form control ${loc}.`);\n}\n\nfunction _throwInvalidValueAccessorError(dir: AbstractControlDirective) {\n  const loc = _describeControlLocation(dir);\n  throw new RuntimeError(\n      RuntimeErrorCode.NG_VALUE_ACCESSOR_NOT_PROVIDED,\n      `Value accessor was not provided as an array for form control with ${loc}. ` +\n          `Check that the \\`NG_VALUE_ACCESSOR\\` token is configured as a \\`multi: true\\` provider.`);\n}\n\nexport function isPropertyUpdated(changes: {[key: string]: any}, viewModel: any): boolean {\n  if (!changes.hasOwnProperty('model')) return false;\n  const change = changes['model'];\n\n  if (change.isFirstChange()) return true;\n  return !Object.is(viewModel, change.currentValue);\n}\n\nexport function isBuiltInAccessor(valueAccessor: ControlValueAccessor): boolean {\n  // Check if a given value accessor is an instance of a class that directly extends\n  // `BuiltInControlValueAccessor` one.\n  return Object.getPrototypeOf(valueAccessor.constructor) === BuiltInControlValueAccessor;\n}\n\nexport function syncPendingControls(form: FormGroup, directives: Set<NgControl>|NgControl[]): void {\n  form._syncPendingControls();\n  directives.forEach((dir: NgControl) => {\n    const control = dir.control as FormControl;\n    if (control.updateOn === 'submit' && control._pendingChange) {\n      dir.viewToModelUpdate(control._pendingValue);\n      control._pendingChange = false;\n    }\n  });\n}\n\n// TODO: vsavkin remove it once https://github.com/angular/angular/issues/3011 is implemented\nexport function selectValueAccessor(\n    dir: NgControl, valueAccessors: ControlValueAccessor[]): ControlValueAccessor|null {\n  if (!valueAccessors) return null;\n\n  if (!Array.isArray(valueAccessors) && (typeof ngDevMode === 'undefined' || ngDevMode))\n    _throwInvalidValueAccessorError(dir);\n\n  let defaultAccessor: ControlValueAccessor|undefined = undefined;\n  let builtinAccessor: ControlValueAccessor|undefined = undefined;\n  let customAccessor: ControlValueAccessor|undefined = undefined;\n\n  valueAccessors.forEach((v: ControlValueAccessor) => {\n    if (v.constructor === DefaultValueAccessor) {\n      defaultAccessor = v;\n    } else if (isBuiltInAccessor(v)) {\n      if (builtinAccessor && (typeof ngDevMode === 'undefined' || ngDevMode))\n        _throwError(dir, 'More than one built-in value accessor matches form control with');\n      builti