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94 lines
2.6 KiB
94 lines
2.6 KiB
export const DEPENDENCY_KEYS_METADATA_KEY = 'extollo:di:dependencies:ctor'
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export const DEPENDENCY_KEYS_PROPERTY_METADATA_KEY = 'extollo:di:dependencies:properties'
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export const DEPENDENCY_KEYS_SERVICE_TYPE_KEY = 'extollo:di:service_type'
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/**
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* Interface that designates a particular value as able to be constructed.
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*/
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export interface Instantiable<T> {
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new(...args: any[]): T
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}
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/**
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* Returns true if the given value is instantiable.
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* @param what
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*/
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export function isInstantiable<T>(what: unknown): what is Instantiable<T> {
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return (
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Boolean(what)
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&& (typeof what === 'object' || typeof what === 'function')
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&& (what !== null)
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&& 'constructor' in what
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&& typeof what.constructor === 'function'
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)
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}
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/**
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* Returns true if the given value is instantiable and, once instantiated,
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* will create an instance of the given static class.
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* @param what
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* @param type
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*/
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export function isInstantiableOf<T>(what: unknown, type: StaticClass<T, any>): what is Instantiable<T> {
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return isInstantiable(what) && what.prototype instanceof type
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}
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/**
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* Type that identifies a value as a static class, even if it is not instantiable.
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*/
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export type StaticClass<T, T2> = Function & {prototype: T} & T2 // eslint-disable-line @typescript-eslint/ban-types
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/**
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* Returns true if the parameter is a static class.
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* @param something
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*/
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export function isStaticClass<T, T2>(something: unknown): something is StaticClass<T, T2> {
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return typeof something === 'function' && typeof something.prototype !== 'undefined'
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}
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/**
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* Type used to represent a value that can identify a factory in the container.
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*/
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export type DependencyKey = Instantiable<any> | StaticClass<any, any> | string
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/**
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* A DependencyKey, but typed
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*/
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export type TypedDependencyKey<T> = Instantiable<T> | StaticClass<T, any> | string
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/**
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* Interface used to store dependency requirements by their place in the injectable
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* target's parameters.
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*/
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export interface DependencyRequirement {
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paramIndex: number,
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key: DependencyKey,
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overridden: boolean,
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}
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/**
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* Interface used to store dependency requirements by the class property they should
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* be injected into.
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*/
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export interface PropertyDependency {
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key: DependencyKey,
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property: string | symbol,
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debug?: boolean,
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}
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/**
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* Interface used to keep track of singleton factory values, by their dependency key.
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*/
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export interface InstanceRef {
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key: DependencyKey,
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value: any,
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}
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/**
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* Interface used to keep track of the injection type of a class.
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*/
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export interface InjectionType {
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type: 'named' | 'singleton',
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name?: string,
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}
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