@angular/core

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Angular - the core framework

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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\n/**\n * Base URL for the error details page.\n *\n * Keep this constant in sync across:\n * - packages/compiler-cli/src/ngtsc/diagnostics/src/error_details_base_url.ts\n * - packages/core/src/error_details_base_url.ts\n */\nexport const ERROR_DETAILS_PAGE_BASE_URL = 'https://angular.io/errors';\n\n/**\n * URL for the XSS security documentation.\n */\nexport const XSS_SECURITY_URL = 'https://g.co/ng/security#xss';\n","/**\n * @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 {ERROR_DETAILS_PAGE_BASE_URL} from './error_details_base_url';\n\n/**\n * The list of error codes used in runtime code of the `core` package.\n * Reserved error code range: 100-999.\n *\n * Note: the minus sign denotes the fact that a particular code has a detailed guide on\n * angular.io. This extra annotation is needed to avoid introducing a separate set to store\n * error codes which have guides, which might leak into runtime code.\n *\n * Full list of available error guides can be found at https://angular.io/errors.\n *\n * Error code ranges per package:\n * - core (this package): 100-999\n * - forms: 1000-1999\n * - common: 2000-2999\n * - animations: 3000-3999\n * - router: 4000-4999\n * - platform-browser: 5000-5500\n */\nexport const enum RuntimeErrorCode {\n // Change Detection Errors\n EXPRESSION_CHANGED_AFTER_CHECKED = -100,\n RECURSIVE_APPLICATION_REF_TICK = 101,\n INFINITE_CHANGE_DETECTION = 103,\n\n // Dependency Injection Errors\n CYCLIC_DI_DEPENDENCY = -200,\n PROVIDER_NOT_FOUND = -201,\n INVALID_FACTORY_DEPENDENCY = 202,\n MISSING_INJECTION_CONTEXT = -203,\n INVALID_INJECTION_TOKEN = 204,\n INJECTOR_ALREADY_DESTROYED = 205,\n PROVIDER_IN_WRONG_CONTEXT = 207,\n MISSING_INJECTION_TOKEN = 208,\n INVALID_MULTI_PROVIDER = -209,\n MISSING_DOCUMENT = 210,\n\n // Template Errors\n MULTIPLE_COMPONENTS_MATCH = -300,\n EXPORT_NOT_FOUND = -301,\n PIPE_NOT_FOUND = -302,\n UNKNOWN_BINDING = 303,\n UNKNOWN_ELEMENT = 304,\n TEMPLATE_STRUCTURE_ERROR = 305,\n INVALID_EVENT_BINDING = 306,\n HOST_DIRECTIVE_UNRESOLVABLE = 307,\n HOST_DIRECTIVE_NOT_STANDALONE = 308,\n DUPLICATE_DIRECTIVE = 309,\n HOST_DIRECTIVE_COMPONENT = 310,\n HOST_DIRECTIVE_UNDEFINED_BINDING = 311,\n HOST_DIRECTIVE_CONFLICTING_ALIAS = 312,\n MULTIPLE_MATCHING_PIPES = 313,\n\n // Bootstrap Errors\n MULTIPLE_PLATFORMS = 400,\n PLATFORM_NOT_FOUND = 401,\n MISSING_REQUIRED_INJECTABLE_IN_BOOTSTRAP = 402,\n BOOTSTRAP_COMPONENTS_NOT_FOUND = -403,\n PLATFORM_ALREADY_DESTROYED = 404,\n ASYNC_INITIALIZERS_STILL_RUNNING = 405,\n APPLICATION_REF_ALREADY_DESTROYED = 406,\n RENDERER_NOT_FOUND = 407,\n\n // Hydration Errors\n HYDRATION_NODE_MISMATCH = -500,\n HYDRATION_MISSING_SIBLINGS = -501,\n HYDRATION_MISSING_NODE = -502,\n UNSUPPORTED_PROJECTION_DOM_NODES = -503,\n INVALID_SKIP_HYDRATION_HOST = -504,\n MISSING_HYDRATION_ANNOTATIONS = -505,\n HYDRATION_STABLE_TIMEDOUT = -506,\n MISSING_SSR_CONTENT_INTEGRITY_MARKER = -507,\n\n // Signal Errors\n SIGNAL_WRITE_FROM_ILLEGAL_CONTEXT = 600,\n REQUIRE_SYNC_WITHOUT_SYNC_EMIT = 601,\n ASSERTION_NOT_INSIDE_REACTIVE_CONTEXT = -602,\n\n // Styling Errors\n\n // Declarations Errors\n\n // i18n Errors\n INVALID_I18N_STRUCTURE = 700,\n MISSING_LOCALE_DATA = 701,\n\n // Defer errors (750-799 range)\n DEFER_LOADING_FAILED = 750,\n\n // standalone errors\n IMPORT_PROVIDERS_FROM_STANDALONE = 800,\n\n // JIT Compilation Errors\n // Other\n INVALID_DIFFER_INPUT = 900,\n NO_SUPPORTING_DIFFER_FACTORY = 901,\n VIEW_ALREADY_ATTACHED = 902,\n INVALID_INHERITANCE = 903,\n UNSAFE_VALUE_IN_RESOURCE_URL = 904,\n UNSAFE_VALUE_IN_SCRIPT = 905,\n MISSING_GENERATED_DEF = 906,\n TYPE_IS_NOT_STANDALONE = 907,\n MISSING_ZONEJS = 908,\n UNEXPECTED_ZONE_STATE = 909,\n UNSAFE_IFRAME_ATTRS = -910,\n VIEW_ALREADY_DESTROYED = 911,\n COMPONENT_ID_COLLISION = -912,\n IMAGE_PERFORMANCE_WARNING = -913,\n\n // Signal inputs\n REQUIRED_INPUT_NO_VALUE = -950,\n\n // Runtime dependency tracker errors\n RUNTIME_DEPS_INVALID_IMPORTED_TYPE = 1000,\n RUNTIME_DEPS_ORPHAN_COMPONENT = 1001,\n}\n\n\n/**\n * Class that represents a runtime error.\n * Formats and outputs the error message in a consistent way.\n *\n * Example:\n * ```\n * throw new RuntimeError(\n * RuntimeErrorCode.INJECTOR_ALREADY_DESTROYED,\n * ngDevMode && 'Injector has already been destroyed.');\n * ```\n *\n * Note: the `message` argument contains a descriptive error message as a string in development\n * mode (when the `ngDevMode` is defined). In production mode (after tree-shaking pass), the\n * `message` argument becomes `false`, thus we account for it in the typings and the runtime\n * logic.\n */\nexport class RuntimeError<T extends number = RuntimeErrorCode> extends Error {\n constructor(public code: T, message: null|false|string) {\n super(formatRuntimeError<T>(code, message));\n }\n}\n\n/**\n * Called to format a runtime error.\n * See additional info on the `message` argument type in the `RuntimeError` class description.\n */\nexport function formatRuntimeError<T extends number = RuntimeErrorCode>(\n code: T, message: null|false|string): string {\n // Error code might be a negative number, which is a special marker that instructs the logic to\n // generate a link to the error details page on angular.io.\n // We also prepend `0` to non-compile-time errors.\n const fullCode = `NG0${Math.abs(code)}`;\n\n let errorMessage = `${fullCode}${message ? ': ' + message : ''}`;\n\n if (ngDevMode && code < 0) {\n const addPeriodSeparator = !errorMessage.match(/[.,;!?\\n]$/);\n const separator = addPeriodSeparator ? '.' : '';\n errorMessage =\n `${errorMessage}${separator} Find more at ${ERROR_DETAILS_PAGE_BASE_URL}/${fullCode}`;\n }\n return errorMessage;\n}\n","/**\n * @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 {SIGNAL_NODE, SignalNode, signalSetFn} from '@angular/core/primitives/signals';\n\nexport const REQUIRED_UNSET_VALUE = /* @__PURE__ */ Symbol('InputSignalNode#UNSET');\n\n/**\n * Reactive node type for an input signal. An input signal extends a signal.\n * There are special properties to enable transforms and required inputs.\n */\nexport interface InputSignalNode<ReadT, WriteT> extends\n SignalNode<ReadT|typeof REQUIRED_UNSET_VALUE> {\n /**\n * User-configured transform that will run whenever a new value is applied\n * to the input signal node.\n */\n transformFn: ((value: WriteT) => ReadT)|undefined;\n\n /**\n * Applies a new value to the input signal. Expects transforms to be run\n * manually before.\n *\n * This function is called by the framework runtime code whenever a binding\n * changes. The value can in practice be anything at runtime, but for typing\n * purposes we assume it's a valid `ReadT` value. Type-checking will enforce that.\n */\n applyValueToInputSignal<ReadT, WriteT>(node: InputSignalNode<ReadT, WriteT>, value: ReadT): void;\n}\n\n// Note: Using an IIFE here to ensure that the spread assignment is not considered\n// a side-effect, ending up preserving `COMPUTED_NODE` and `REACTIVE_NODE`.\n// TODO: remove when https://github.com/evanw/esbuild/issues/3392 is resolved.\nexport const INPUT_SIGNAL_NODE: InputSignalNode<unknown, unknown> = /* @__PURE__ */ (() => {\n return {\n ...SIGNAL_NODE,\n transformFn: undefined,\n\n applyValueToInputSignal<ReadT, WriteT>(node: InputSignalNode<ReadT, WriteT>, value: ReadT) {\n signalSetFn(node, value);\n }\n };\n})();\n","/**\n * @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 {producerAccessed, SIGNAL} from '@angular/core/primitives/signals';\n\nimport {RuntimeError, RuntimeErrorCode} from '../errors';\nimport {Signal} from '../render3/reactivity/api';\n\nimport {INPUT_SIGNAL_NODE, InputSignalNode, REQUIRED_UNSET_VALUE} from './input_signal_node';\n\n/**\n * @developerPreview\n *\n * Options for signal inputs.\n */\nexport interface InputOptions<ReadT, WriteT> {\n /** Optional public name for the input. By default, the class field name is used. */\n alias?: string;\n /**\n * Optional transform that runs whenever a new value is bound. Can be used to\n * transform the input value before the input is updated.\n *\n * The transform function can widen the type of the input. For example, consider\n * an input for `disabled`. In practice, as the component author, you want to only\n * deal with a boolean, but users may want to bind a string if they just use the\n * attribute form to bind to the input via `<my-dir input>`. A transform can then\n * handle such string values and convert them to `boolean`. See: {@link booleanAttribute}.\n */\n transform?: (v: WriteT) => ReadT;\n}\n\n/**\n * Signal input options without the transform option.\n *\n * @developerPreview\n */\nexport type InputOptionsWithoutTransform<ReadT> =\n // Note: We still keep a notion of `transform` for auto-completion.\n Omit<InputOptions<ReadT, ReadT>, 'transform'>&{transform?: undefined};\n/**\n * Signal input options with the transform option required.\n *\n * @developerPreview\n */\nexport type InputOptionsWithTransform<ReadT, WriteT> =\n Required<Pick<InputOptions<ReadT, WriteT>, 'transform'>>&InputOptions<ReadT, WriteT>;\n\nexport const ɵINPUT_SIGNAL_BRAND_READ_TYPE = /* @__PURE__ */ Symbol();\nexport const ɵINPUT_SIGNAL_BRAND_WRITE_TYPE = /* @__PURE__ */ Symbol();\n\n/**\n * `InputSignal` is represents a special `Signal` for a directive/component input.\n *\n * An input signal is similar to a non-writable signal except that it also\n * carries additional type-information for transforms, and that Angular internally\n * updates the signal whenever a new value is bound.\n *\n * @developerPreview\n */\nexport interface InputSignal<ReadT, WriteT = ReadT> extends Signal<ReadT> {\n [SIGNAL]: InputSignalNode<ReadT, WriteT>;\n [ɵINPUT_SIGNAL_BRAND_READ_TYPE]: ReadT;\n [ɵINPUT_SIGNAL_BRAND_WRITE_TYPE]: WriteT;\n}\n\n/**\n * Creates an input signal.\n *\n * @param initialValue The initial value.\n * Can be set to {@link REQUIRED_UNSET_VALUE} for required inputs.\n * @param options Additional options for the input. e.g. a transform, or an alias.\n */\nexport function createInputSignal<ReadT, WriteT>(\n initialValue: ReadT, options?: InputOptions<ReadT, WriteT>): InputSignal<ReadT, WriteT> {\n const node: InputSignalNode<ReadT, WriteT> = Object.create(INPUT_SIGNAL_NODE);\n\n node.value = initialValue;\n\n // Perf note: Always set `transformFn` here to ensure that `node` always\n // has the same v8 class shape, allowing monomorphic reads on input signals.\n node.transformFn = options?.transform;\n\n function inputValueFn() {\n // Record that someone looked at this signal.\n producerAccessed(node);\n\n if (node.value === REQUIRED_UNSET_VALUE) {\n throw new RuntimeError(\n RuntimeErrorCode.REQUIRED_INPUT_NO_VALUE,\n ngDevMode && 'Input is required but no value is available yet.');\n }\n\n return node.value;\n }\n\n (inputValueFn as any)[SIGNAL] = node;\n return inputValueFn as InputSignal<ReadT, WriteT>;\n}\n","/**\n * @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 {createInputSignal, InputOptions, InputOptionsWithoutTransform, InputOptionsWithTransform, InputSignal} from './input_signal';\nimport {REQUIRED_UNSET_VALUE} from './input_signal_node';\n\nexport function inputFunction<ReadT, WriteT>(\n initialValue?: ReadT,\n opts?: InputOptions<ReadT, WriteT>): InputSignal<ReadT|undefined, WriteT> {\n return createInputSignal(initialValue, opts);\n}\n\nexport function inputRequiredFunction<ReadT, WriteT>(opts?: InputOptions<ReadT, WriteT>):\n InputSignal<ReadT, WriteT> {\n return createInputSignal(REQUIRED_UNSET_VALUE as never, opts);\n}\n\n/**\n * The `input` function allows declaration of inputs in directives and\n * components.\n *\n * The function exposes an API for also declaring required inputs via the\n * `input.required` function.\n *\n * @usageNotes\n * Initialize an input in your directive or component by declaring a\n * class field and initializing it with the `input()` or `input.required()`\n * function.\n *\n * ```ts\n * @Directive({..})\n * export class MyDir {\n * firstName = input<string>(); // string|undefined\n * lastName = input.required<string>(); // string\n * age = input(0); // number\n * }\n * ```\n *\n * @developerPreview\n */\nexport interface InputFunction {\n /**\n * Initializes an input with an initial value. If no explicit value\n * is specified, Angular will use `undefined`.\n *\n * Consider using `input.required` for inputs that don't need an\n * initial value.\n *\n * @developerPreview\n */\n <ReadT>(): InputSignal<ReadT|undefined>;\n <ReadT>(initialValue: ReadT, opts?: InputOptionsWithoutTransform<ReadT>): InputSignal<ReadT>;\n <ReadT, WriteT>(initialValue: ReadT, opts: InputOptionsWithTransform<ReadT, WriteT>):\n InputSignal<ReadT, WriteT>;\n\n /**\n * Initializes a required input.\n *\n * Users of your directive/component need to bind to this\n * input. If unset, a compile time error will be reported.\n *\n * @developerPreview\n */\n required: {\n <ReadT>(opts?: InputOptionsWithoutTransform<ReadT>): InputSignal<ReadT>;\n <ReadT, WriteT>(opts: InputOptionsWithTransform<ReadT, WriteT>): InputSignal<ReadT, WriteT>;\n };\n}\n\n/**\n * The `input` function allows declaration of inputs in directives and\n * components.\n *\n * Initializes an input with an initial value. If no explicit value\n * is specified, Angular will use `undefined`.\n *\n * Consider using `input.required` for inputs that don't need an\n * initial value.\n *\n * @usageNotes\n * Initialize an input in your directive or component by declaring a\n * class field and initializing it with the `input()` function.\n *\n * ```ts\n * @Directive({..})\n * export class MyDir {\n * firstName = input<string>(); // string|undefined\n * lastName = input.required<string>(); // string\n * age = input(0); // number\n * }\n * ```\n *\n * @developerPreview\n */\nexport const input: InputFunction = (() => {\n // Note: This may be considered a side-effect, but nothing will depend on\n // this assignment, unless this `input` constant export is accessed. It's a\n // self-contained side effect that is local to the user facing`input` export.\n (inputFunction as any).required = inputRequiredFunction;\n return inputFunction as (typeof inputFunction&{required: typeof inputRequiredFunction});\n})();\n","/**\n * @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\nexport function getClosureSafeProperty<T>(objWithPropertyToExtract: T): string {\n for (let key in objWithPropertyToExtract) {\n if (objWithPropertyToExtract[key] === getClosureSafeProperty as any) {\n return key;\n }\n }\n throw Error('Could not find renamed property on target object.');\n}\n\n/**\n * Sets properties on a target object from a source object, but only if\n * the property doesn't already exist on the target object.\n * @param target The target to set properties on\n * @param source The source of the property keys and values to set\n */\nexport function fillProperties(target: Record<string, unknown>, source: Record<string, unknown>) {\n for (const key in source) {\n if (source.hasOwnProperty(key) && !target.hasOwnProperty(key)) {\n target[key] = source[key];\n }\n }\n}\n","/**\n * @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\nexport function stringify(token: any): string {\n if (typeof token === 'string') {\n return token;\n }\n\n if (Array.isArray(token)) {\n return '[' + token.map(stringify).join(', ') + ']';\n }\n\n if (token == null) {\n return '' + token;\n }\n\n if (token.overriddenName) {\n return `${token.overriddenName}`;\n }\n\n if (token.name) {\n return `${token.name}`;\n }\n\n const res = token.toString();\n\n if (res == null) {\n return '' + res;\n }\n\n const newLineIndex = res.indexOf('\\n');\n return newLineIndex === -1 ? res : res.substring(0, newLineIndex);\n}\n\n/**\n * Concatenates two strings with separator, allocating new strings only when necessary.\n *\n * @param before before string.\n * @param separator separator string.\n * @param after after string.\n * @returns concatenated string.\n */\nexport function concatStringsWithSpace(before: string|null, after: string|null): string {\n return (before == null || before === '') ?\n (after === null ? '' : after) :\n ((after == null || after === '') ? before : before + ' ' + after);\n}\n\n/**\n * Ellipses the string in the middle when longer than the max length\n *\n * @param string\n * @param maxLength of the output string\n * @returns elispsed string with ... in the middle\n */\nexport function truncateMiddle(str: string, maxLength = 100): string {\n if (!str || maxLength < 1 || str.length <= maxLength) return str;\n if (maxLength == 1) return str.substring(0, 1) + '...';\n\n const halfLimit = Math.round(maxLength / 2);\n return str.substring(0, halfLimit) + '...' + str.substring(str.length - halfLimit);\n}\n","/**\n * @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 {Type} from '../interface/type';\nimport {getClosureSafeProperty} from '../util/property';\nimport {stringify} from '../util/stringify';\n\n\n\n/**\n * An interface that a function passed into {@link forwardRef} has to implement.\n *\n * @usageNotes\n * ### Example\n *\n * {@example core/di/ts/forward_ref/forward_ref_spec.ts region='forward_ref_fn'}\n * @publicApi\n */\nexport interface ForwardRefFn {\n (): any;\n}\n\nconst __forward_ref__ = getClosureSafeProperty({__forward_ref__: getClosureSafeProperty});\n\n/**\n * Allows to refer to references which are not yet defined.\n *\n * For instance, `forwardRef` is used when the `token` which we need to refer to for the purposes of\n * DI is declared, but not yet defined. It is also used when the `token` which we use when creating\n * a query is not yet defined.\n *\n * `forwardRef` is also used to break circularities in standalone components imports.\n *\n * @usageNotes\n * ### Circular dependency example\n * {@example core/di/ts/forward_ref/forward_ref_spec.ts region='forward_ref'}\n *\n * ### Circular standalone reference import example\n * ```ts\n * @Component({\n * standalone: true,\n * imports: [ChildComponent],\n * selector: 'app-parent',\n * template: `<app-child [hideParent]=\"hideParent\"></app-child>`,\n * })\n * export class ParentComponent {\n * @Input() hideParent: boolean;\n * }\n *\n *\n * @Component({\n * standalone: true,\n * imports: [CommonModule, forwardRef(() => ParentComponent)],\n * selector: 'app-child',\n * template: `<app-parent *ngIf=\"!hideParent\"></app-parent>`,\n * })\n * export class ChildComponent {\n * @Input() hideParent: boolean;\n * }\n * ```\n *\n * @publicApi\n */\nexport function forwardRef(forwardRefFn: ForwardRefFn): Type<any> {\n (<any>forwardRefFn).__forward_ref__ = forwardRef;\n (<any>forwardRefFn).toString = function() {\n return stringify(this());\n };\n return (<Type<any>><any>forwardRefFn);\n}\n\n/**\n * Lazily retrieves the reference value from a forwardRef.\n *\n * Acts as the identity function when given a non-forward-ref value.\n *\n * @usageNotes\n * ### Example\n *\n * {@example core/di/ts/forward_ref/forward_ref_spec.ts region='resolve_forward_ref'}\n *\n * @see {@link forwardRef}\n * @publicApi\n */\nexport function resolveForwardRef<T>(type: T): T {\n return isForwardRef(type) ? type() : type;\n}\n\n/** Checks whether a function is wrapped by a `forwardRef`. */\nexport function isForwardRef(fn: any): fn is() => any {\n return typeof fn === 'function' && fn.hasOwnProperty(__forward_ref__) &&\n fn.__forward_ref__ === forwardRef;\n}\n","/**\n * @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 {Type} from '../../interface/type';\n\n/**\n * Configures the `Injector` to return a value for a token.\n * Base for `ValueProvider` decorator.\n *\n * @publicApi\n */\nexport interface ValueSansProvider {\n /**\n * The value to inject.\n */\n useValue: any;\n}\n\n/**\n * Configures the `Injector` to return a value for a token.\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * ### Example\n *\n * {@example core/di/ts/provider_spec.ts region='ValueProvider'}\n *\n * ### Multi-value example\n *\n * {@example core/di/ts/provider_spec.ts region='MultiProviderAspect'}\n *\n * @publicApi\n */\nexport interface ValueProvider extends ValueSansProvider {\n /**\n * An injection token. Typically an instance of `Type` or `InjectionToken`, but can be `any`.\n */\n provide: any;\n\n /**\n * When true, injector returns an array of instances. This is useful to allow multiple\n * providers spread across many files to provide configuration information to a common token.\n */\n multi?: boolean;\n}\n\n/**\n * Configures the `Injector` to return an instance of `useClass` for a token.\n * Base for `StaticClassProvider` decorator.\n *\n * @publicApi\n */\nexport interface StaticClassSansProvider {\n /**\n * An optional class to instantiate for the `token`. By default, the `provide`\n * class is instantiated.\n */\n useClass: Type<any>;\n\n /**\n * A list of `token`s to be resolved by the injector. The list of values is then\n * used as arguments to the `useClass` constructor.\n */\n deps: any[];\n}\n\n/**\n * Configures the `Injector` to return an instance of `useClass` for a token.\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * {@example core/di/ts/provider_spec.ts region='StaticClassProvider'}\n *\n * Note that following two providers are not equal:\n *\n * {@example core/di/ts/provider_spec.ts region='StaticClassProviderDifference'}\n *\n * ### Multi-value example\n *\n * {@example core/di/ts/provider_spec.ts region='MultiProviderAspect'}\n *\n * @publicApi\n */\nexport interface StaticClassProvider extends StaticClassSansProvider {\n /**\n * An injection token. Typically an instance of `Type` or `InjectionToken`, but can be `any`.\n */\n provide: any;\n\n /**\n * When true, injector returns an array of instances. This is useful to allow multiple\n * providers spread across many files to provide configuration information to a common token.\n */\n multi?: boolean;\n}\n\n/**\n * Configures the `Injector` to return an instance of a token.\n *\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * ```ts\n * @Injectable(SomeModule, {deps: []})\n * class MyService {}\n * ```\n *\n * @publicApi\n */\nexport interface ConstructorSansProvider {\n /**\n * A list of `token`s to be resolved by the injector.\n */\n deps?: any[];\n}\n\n/**\n * Configures the `Injector` to return an instance of a token.\n *\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * {@example core/di/ts/provider_spec.ts region='ConstructorProvider'}\n *\n * ### Multi-value example\n *\n * {@example core/di/ts/provider_spec.ts region='MultiProviderAspect'}\n *\n * @publicApi\n */\nexport interface ConstructorProvider extends ConstructorSansProvider {\n /**\n * An injection token. Typically an instance of `Type` or `InjectionToken`, but can be `any`.\n */\n provide: Type<any>;\n\n /**\n * When true, injector returns an array of instances. This is useful to allow multiple\n * providers spread across many files to provide configuration information to a common token.\n */\n multi?: boolean;\n}\n\n/**\n * Configures the `Injector` to return a value of another `useExisting` token.\n *\n * @see {@link ExistingProvider}\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @publicApi\n */\nexport interface ExistingSansProvider {\n /**\n * Existing `token` to return. (Equivalent to `injector.get(useExisting)`)\n */\n useExisting: any;\n}\n\n/**\n * Configures the `Injector` to return a value of another `useExisting` token.\n *\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * {@example core/di/ts/provider_spec.ts region='ExistingProvider'}\n *\n * ### Multi-value example\n *\n * {@example core/di/ts/provider_spec.ts region='MultiProviderAspect'}\n *\n * @publicApi\n */\nexport interface ExistingProvider extends ExistingSansProvider {\n /**\n * An injection token. Typically an instance of `Type` or `InjectionToken`, but can be `any`.\n */\n provide: any;\n\n /**\n * When true, injector returns an array of instances. This is useful to allow multiple\n * providers spread across many files to provide configuration information to a common token.\n */\n multi?: boolean;\n}\n\n/**\n * Configures the `Injector` to return a value by invoking a `useFactory` function.\n *\n * @see {@link FactoryProvider}\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @publicApi\n */\nexport interface FactorySansProvider {\n /**\n * A function to invoke to create a value for this `token`. The function is invoked with\n * resolved values of `token`s in the `deps` field.\n */\n useFactory: Function;\n\n /**\n * A list of `token`s to be resolved by the injector. The list of values is then\n * used as arguments to the `useFactory` function.\n */\n deps?: any[];\n}\n\n/**\n * Configures the `Injector` to return a value by invoking a `useFactory` function.\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * {@example core/di/ts/provider_spec.ts region='FactoryProvider'}\n *\n * Dependencies can also be marked as optional:\n *\n * {@example core/di/ts/provider_spec.ts region='FactoryProviderOptionalDeps'}\n *\n * ### Multi-value example\n *\n * {@example core/di/ts/provider_spec.ts region='MultiProviderAspect'}\n *\n * @publicApi\n */\nexport interface FactoryProvider extends FactorySansProvider {\n /**\n * An injection token. (Typically an instance of `Type` or `InjectionToken`, but can be `any`).\n */\n provide: any;\n\n /**\n * When true, injector returns an array of instances. This is useful to allow multiple\n * providers spread across many files to provide configuration information to a common token.\n */\n multi?: boolean;\n}\n\n/**\n * Describes how an `Injector` should be configured as static (that is, without reflection).\n * A static provider provides tokens to an injector for various types of dependencies.\n *\n * @see {@link Injector.create()}\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection-providers).\n *\n * @publicApi\n */\nexport type StaticProvider =\n ValueProvider|ExistingProvider|StaticClassProvider|ConstructorProvider|FactoryProvider|any[];\n\n\n/**\n * Configures the `Injector` to return an instance of `Type` when `Type' is used as the token.\n *\n * Create an instance by invoking the `new` operator and supplying additional arguments.\n * This form is a short form of `TypeProvider`;\n *\n * For more details, see the [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * {@example core/di/ts/provider_spec.ts region='TypeProvider'}\n *\n * @publicApi\n */\nexport interface TypeProvider extends Type<any> {}\n\n/**\n * Configures the `Injector` to return a value by invoking a `useClass` function.\n * Base for `ClassProvider` decorator.\n *\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @publicApi\n */\nexport interface ClassSansProvider {\n /**\n * Class to instantiate for the `token`.\n */\n useClass: Type<any>;\n}\n\n/**\n * Configures the `Injector` to return an instance of `useClass` for a token.\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @usageNotes\n *\n * {@example core/di/ts/provider_spec.ts region='ClassProvider'}\n *\n * Note that following two providers are not equal:\n *\n * {@example core/di/ts/provider_spec.ts region='ClassProviderDifference'}\n *\n * ### Multi-value example\n *\n * {@example core/di/ts/provider_spec.ts region='MultiProviderAspect'}\n *\n * @publicApi\n */\nexport interface ClassProvider extends ClassSansProvider {\n /**\n * An injection token. (Typically an instance of `Type` or `InjectionToken`, but can be `any`).\n */\n provide: any;\n\n /**\n * When true, injector returns an array of instances. This is useful to allow multiple\n * providers spread across many files to provide configuration information to a common token.\n */\n multi?: boolean;\n}\n\n/**\n * Describes how the `Injector` should be configured.\n * @see [\"Dependency Injection Guide\"](guide/dependency-injection).\n *\n * @see {@link StaticProvider}\n *\n * @publicApi\n */\nexport type Provider = TypeProvider|ValueProvider|ClassProvider|ConstructorProvider|\n ExistingProvider|FactoryProvider|any[];\n\n/**\n * Encapsulated `Provider`s that are only accepted during creation of an `EnvironmentInjector` (e.g.\n * in an `NgModule`).\n *\n * Using this wrapper type prevents providers which are only designed to work in\n * application/environment injectors from being accidentally included in\n * `@Component.providers` and ending up in a component injector.\n *\n * This wrapper type prevents access to the `Provider`s inside.\n *\n * @see {@link makeEnvironmentProviders}\n * @see {@link importProvidersFrom}\n *\n * @publicApi\n */\nexport type EnvironmentProviders = {\n