refactor(core): move input signals into own directory (angular#54200)

Moves the signal input code into its own directory to avoid too many files in the `authoring` root once model inputs are introduced.

PR Close angular#54200

Author: crisbeto

packages/core/src/authoring.ts

@@ -9,6 +9,6 @@
 // Note: `input` is exported in `core.ts` due to:
 // https://docs.google.com/document/d/1RXb1wYwsbJotO1KBgSDsAtKpduGmIHod9ADxuXcAvV4/edit?tab=t.0.
 
-export {InputFunction} from './authoring/input';
-export {InputOptions, InputOptionsWithoutTransform, InputOptionsWithTransform, InputSignal, InputSignalWithTransform, ɵINPUT_SIGNAL_BRAND_WRITE_TYPE} from './authoring/input_signal';
-export {ɵUnwrapDirectiveSignalInputs} from './authoring/input_type_checking';
+export {InputFunction} from './authoring/input/input';
+export {InputOptions, InputOptionsWithoutTransform, InputOptionsWithTransform, InputSignal, InputSignalWithTransform, ɵINPUT_SIGNAL_BRAND_WRITE_TYPE} from './authoring/input/input_signal';
+export {ɵUnwrapDirectiveSignalInputs} from './authoring/input/input_type_checking';

packages/core/src/authoring/input.ts renamed to packages/core/src/authoring/input/input.ts

@@ -8,8 +8,8 @@
 
 import {producerAccessed, SIGNAL} from '@angular/core/primitives/signals';
 
-import {RuntimeError, RuntimeErrorCode} from '../errors';
-import {Signal} from '../render3/reactivity/api';
+import {RuntimeError, RuntimeErrorCode} from '../../errors';
+import {Signal} from '../../render3/reactivity/api';
 
 import {INPUT_SIGNAL_NODE, InputSignalNode, REQUIRED_UNSET_VALUE} from './input_signal_node';
 

packages/core/src/authoring/input_signal.ts renamed to packages/core/src/authoring/input/input_signal.ts

@@ -16,7 +16,7 @@ export * from './authoring';
 // Input is exported separately as this file is exempted from JSCompiler's
 // conformance requirement for inferred const exports.
 // See: https://docs.google.com/document/d/1RXb1wYwsbJotO1KBgSDsAtKpduGmIHod9ADxuXcAvV4/edit?tab=t.0
-export {input} from './authoring/input';
+export {input} from './authoring/input/input';
 
 export * from './metadata';
 export * from './version';

packages/core/src/authoring/input_signal_node.ts renamed to packages/core/src/authoring/input/input_signal_node.ts

@@ -7,7 +7,7 @@
  */
 
 
-import {InputSignalNode} from '../authoring/input_signal_node';
+import {InputSignalNode} from '../authoring/input/input_signal_node';
 
 export function applyValueToInputField<T>(
     instance: T, inputSignalNode: null|InputSignalNode<unknown, unknown>, privateName: string,

packages/core/src/authoring/input_type_checking.ts renamed to packages/core/src/authoring/input/input_type_checking.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {InputSignalNode} from '../../authoring/input_signal_node';
+import {InputSignalNode} from '../../authoring/input/input_signal_node';
 import {OnChanges} from '../../interface/lifecycle_hooks';
 import {SimpleChange, SimpleChanges} from '../../interface/simple_change';
 import {assertString} from '../../util/assert';

packages/core/src/core.ts

@@ -8,8 +8,8 @@
 
 import {setActiveConsumer, SIGNAL} from '@angular/core/primitives/signals';
 
-import {InputSignalWithTransform} from '../../authoring/input_signal';
-import {InputSignalNode} from '../../authoring/input_signal_node';
+import {InputSignalWithTransform} from '../../authoring/input/input_signal';
+import {InputSignalNode} from '../../authoring/input/input_signal_node';
 import {applyValueToInputField} from '../apply_value_input_field';
 import {DirectiveDef, InputFlags} from '../interfaces/definition';
 

packages/core/src/render3/apply_value_input_field.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {InputSignalNode} from '../../authoring/input_signal_node';
+import {InputSignalNode} from '../../authoring/input/input_signal_node';
 import {ModuleWithProviders, ProcessProvidersFunction} from '../../di/interface/provider';
 import {EnvironmentInjector} from '../../di/r3_injector';
 import {Type} from '../../interface/type';

packages/core/src/render3/features/ng_onchanges_feature.ts

@@ -12,9 +12,9 @@
  * the resulting types match our expectations (via comments asserting the `.d.ts`).
  */
 
-import {input} from '../../src/authoring/input';
+import {input} from '../../src/authoring/input/input';
 // import preserved to simplify `.d.ts` emit and simplify the `type_tester` logic.
-import {InputSignal, InputSignalWithTransform} from '../../src/authoring/input_signal';
+import {InputSignal, InputSignalWithTransform} from '../../src/authoring/input/input_signal';
 
 export class InputSignatureTest {
   /** string | undefined */