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{"version":3,"file":"directive-helpers.js","sources":["../../src/directive-helpers.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2020 Google LLC\n * SPDX-License-Identifier: BSD-3-Clause\n */\n\nimport {\n _$LH,\n Part,\n DirectiveParent,\n CompiledTemplateResult,\n MaybeCompiledTemplateResult,\n UncompiledTemplateResult,\n} from './lit-html.js';\nimport {\n DirectiveResult,\n DirectiveClass,\n PartInfo,\n AttributePartInfo,\n} from './directive.js';\ntype Primitive = null | undefined | boolean | number | string | symbol | bigint;\n\nconst {_ChildPart: ChildPart} = _$LH;\n\ntype ChildPart = InstanceType<typeof ChildPart>;\n\nconst ENABLE_SHADYDOM_NOPATCH = true;\n\nconst wrap =\n ENABLE_SHADYDOM_NOPATCH &&\n window.ShadyDOM?.inUse &&\n window.ShadyDOM?.noPatch === true\n ? window.ShadyDOM!.wrap\n : (node: Node) => node;\n\n/**\n * Tests if a value is a primitive value.\n *\n * See https://tc39.github.io/ecma262/#sec-typeof-operator\n */\nexport const isPrimitive = (value: unknown): value is Primitive =>\n value === null || (typeof value != 'object' && typeof value != 'function');\n\nexport const TemplateResultType = {\n HTML: 1,\n SVG: 2,\n} as const;\n\nexport type TemplateResultType =\n (typeof TemplateResultType)[keyof typeof TemplateResultType];\n\ntype IsTemplateResult = {\n (val: unknown): val is MaybeCompiledTemplateResult;\n <T extends TemplateResultType>(\n val: unknown,\n type: T\n ): val is UncompiledTemplateResult<T>;\n};\n\n/**\n * Tests if a value is a TemplateResult or a CompiledTemplateResult.\n */\nexport const isTemplateResult: IsTemplateResult = (\n value: unknown,\n type?: TemplateResultType\n): value is UncompiledTemplateResult =>\n type === undefined\n ? // This property needs to remain unminified.\n (value as UncompiledTemplateResult)?.['_$litType$'] !== undefined\n : (value as UncompiledTemplateResult)?.['_$litType$'] === type;\n\n/**\n * Tests if a value is a CompiledTemplateResult.\n */\nexport const isCompiledTemplateResult = (\n value: unknown\n): value is CompiledTemplateResult => {\n return (value as CompiledTemplateResult)?.['_$litType$']?.h != null;\n};\n\n/**\n * Tests if a value is a DirectiveResult.\n */\nexport const isDirectiveResult = (value: unknown): value is DirectiveResult =>\n // This property needs to remain unminified.\n (value as DirectiveResult)?.['_$litDirective$'] !== undefined;\n\n/**\n * Retrieves the Directive class for a DirectiveResult\n */\nexport const getDirectiveClass = (value: unknown): DirectiveClass | undefined =>\n // This property needs to remain unminified.\n (value as DirectiveResult)?.['_$litDirective$'];\n\n/**\n * Tests whether a part has only a single-expression with no strings to\n * interpolate between.\n *\n * Only AttributePart and PropertyPart can have multiple expressions.\n * Multi-expression parts have a `strings` property and single-expression\n * parts do not.\n */\nexport const isSingleExpression = (part: PartInfo) =>\n (part as AttributePartInfo).strings === undefined;\n\nconst createMarker = () => document.createComment('');\n\n/**\n * Inserts a ChildPart into the given container ChildPart's DOM, either at the\n * end of the container ChildPart, or before the optional `refPart`.\n *\n * This does not add the part to the containerPart's committed value. That must\n * be done by callers.\n *\n * @param containerPart Part within which to add the new ChildPart\n * @param refPart Part before which to add the new ChildPart; when omitted the\n * part added to the end of the `containerPart`\n * @param part Part to insert, or undefined to create a new part\n */\nexport const insertPart = (\n containerPart: ChildPart,\n refPart?: ChildPart,\n part?: ChildPart\n): ChildPart => {\n const container = wrap(containerPart._$startNode).parentNode!;\n\n const refNode =\n refPart === undefined ? containerPart._$endNode : refPart._$startNode;\n\n if (part === undefined) {\n const startNode = wrap(container).insertBefore(createMarker(), refNode);\n const endNode = wrap(container).
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