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@avine/ng-if-non-nullish

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Nullish coalescing operator as Angular structural directive and more...

github.com/avine/ng-libs/tree/main/projects/if-non-nullish

avine/ng-libs

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{"version":3,"file":"avine-ng-if-non-nullish.mjs","sources":["../../../projects/if-non-nullish/src/lib/if-non-nullish.directive.ts","../../../projects/if-non-nullish/src/avine-ng-if-non-nullish.ts"],"sourcesContent":["import { Directive, Input, TemplateRef, ViewContainerRef } from '@angular/core';\n\nimport { IfNonNullishContext, IfNullish } from './if-non-nullish.types';\n\n@Directive({\n standalone: true,\n selector: '[ifNonNullish]',\n})\nexport class IfNonNullishDirective<T = unknown> {\n @Input()\n set ifNonNullish(data: T) {\n this.hasNoData = data === null || data === undefined;\n this.updateView(data);\n }\n\n @Input()\n set ifNonNullishFallback(fallbackTemplate: TemplateRef<unknown> | IfNullish) {\n this.fallbackTemplate = fallbackTemplate ?? null;\n if (this.hasNoData) {\n this.createFallbackView();\n }\n }\n\n private context!: IfNonNullishContext<T>;\n\n private hasNoData = true;\n\n private fallbackTemplate: TemplateRef<unknown> | null = null;\n\n private viewState: 'regular' | 'fallback' | 'clear' = 'clear';\n\n /**\n * Assert the correct type of the expression bound to the `ifNonNullish` input within the template.\n *\n * @see https://angular.io/guide/structural-directives#improving-template-type-checking-for-custom-directives\n */\n static ngTemplateGuard_ifNonNullish<T>(_directive: IfNonNullishDirective<T>, data: T): data is Exclude<T, IfNullish> {\n return true;\n }\n\n /**\n * Asserts the correct type of the context for the template that `IfNonNullish` will render.\n *\n * @see https://angular.io/guide/structural-directives#improving-template-type-checking-for-custom-directives\n */\n static ngTemplateContextGuard<T>(\n _directive: IfNonNullishDirective<T>,\n context: any, // eslint-disable-line @typescript-eslint/no-explicit-any\n ): context is IfNonNullishContext<Exclude<T, IfNullish>> {\n return true;\n }\n\n constructor(\n private viewContainerRef: ViewContainerRef,\n private templateRef: TemplateRef<IfNonNullishContext<T>>,\n ) {}\n\n private updateView(data: T) {\n if (!this.hasNoData) {\n this.switchToRegularView(data);\n } else {\n this.switchToFallbackView();\n }\n }\n\n private switchToRegularView(data: T) {\n this.upsertContext(data);\n if (this.viewState === 'regular') {\n return;\n }\n this.createRegularView();\n }\n\n private switchToFallbackView() {\n if (this.viewState === 'fallback') {\n return;\n }\n this.createFallbackView();\n }\n\n private upsertContext(data: T) {\n if (this.context) {\n this.context.$implicit = this.context.ifNonNullish = data;\n } else {\n this.context = { $implicit: data, ifNonNullish: data };\n }\n }\n\n private createRegularView() {\n this.clearView();\n this.viewContainerRef.createEmbeddedView(this.templateRef, this.context);\n this.viewState = 'regular';\n }\n\n private createFallbackView() {\n this.clearView();\n if (!this.fallbackTemplate) {\n return;\n }\n this.viewContainerRef.createEmbeddedView(this.fallbackTemplate);\n this.viewState = 'fallback';\n }\n\n private clearView() {\n if (this.viewState === 'clear') {\n return;\n }\n this.viewContainerRef.clear();\n this.viewState = 'clear';\n }\n}\n","/**\n * Generated bundle index. 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