@angular/core
Version:
Angular - the core framework
371 lines • 44.9 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { RuntimeError } from '../errors';
import { getDeclarationComponentDef } from '../render3/instructions/element_validation';
import { TVIEW } from '../render3/interfaces/view';
import { getParentRElement } from '../render3/node_manipulation';
const AT_THIS_LOCATION = '<-- AT THIS LOCATION';
/**
* Retrieves a user friendly string for a given TNodeType for use in
* friendly error messages
*
* @param tNodeType
* @returns
*/
function getFriendlyStringFromTNodeType(tNodeType) {
switch (tNodeType) {
case 4 /* TNodeType.Container */:
return 'view container';
case 2 /* TNodeType.Element */:
return 'element';
case 8 /* TNodeType.ElementContainer */:
return 'ng-container';
case 32 /* TNodeType.Icu */:
return 'icu';
case 64 /* TNodeType.Placeholder */:
return 'i18n';
case 16 /* TNodeType.Projection */:
return 'projection';
case 1 /* TNodeType.Text */:
return 'text';
default:
// This should not happen as we cover all possible TNode types above.
return '<unknown>';
}
}
/**
* Validates that provided nodes match during the hydration process.
*/
export function validateMatchingNode(node, nodeType, tagName, lView, tNode, isViewContainerAnchor = false) {
if (!node ||
(node.nodeType !== nodeType ||
(node.nodeType === Node.ELEMENT_NODE &&
node.tagName.toLowerCase() !== tagName?.toLowerCase()))) {
const expectedNode = shortRNodeDescription(nodeType, tagName, null);
let header = `During hydration Angular expected ${expectedNode} but `;
const hostComponentDef = getDeclarationComponentDef(lView);
const componentClassName = hostComponentDef?.type?.name;
const expected = `Angular expected this DOM:\n\n${describeExpectedDom(lView, tNode, isViewContainerAnchor)}\n\n`;
let actual = '';
if (!node) {
// No node found during hydration.
header += `the node was not found.\n\n`;
}
else {
const actualNode = shortRNodeDescription(node.nodeType, node.tagName ?? null, node.textContent ?? null);
header += `found ${actualNode}.\n\n`;
actual = `Actual DOM is:\n\n${describeDomFromNode(node)}\n\n`;
}
const footer = getHydrationErrorFooter(componentClassName);
const message = header + expected + actual + getHydrationAttributeNote() + footer;
throw new RuntimeError(-500 /* RuntimeErrorCode.HYDRATION_NODE_MISMATCH */, message);
}
}
/**
* Validates that a given node has sibling nodes
*/
export function validateSiblingNodeExists(node) {
validateNodeExists(node);
if (!node.nextSibling) {
const header = 'During hydration Angular expected more sibling nodes to be present.\n\n';
const actual = `Actual DOM is:\n\n${describeDomFromNode(node)}\n\n`;
const footer = getHydrationErrorFooter();
const message = header + actual + footer;
throw new RuntimeError(-501 /* RuntimeErrorCode.HYDRATION_MISSING_SIBLINGS */, message);
}
}
/**
* Validates that a node exists or throws
*/
export function validateNodeExists(node, lView = null, tNode = null) {
if (!node) {
const header = 'During hydration, Angular expected an element to be present at this location.\n\n';
let expected = '';
let footer = '';
if (lView !== null && tNode !== null) {
expected = `${describeExpectedDom(lView, tNode, false)}\n\n`;
footer = getHydrationErrorFooter();
}
throw new RuntimeError(-502 /* RuntimeErrorCode.HYDRATION_MISSING_NODE */, header + expected + footer);
}
}
/**
* Builds the hydration error message when a node is not found
*
* @param lView the LView where the node exists
* @param tNode the TNode
*/
export function nodeNotFoundError(lView, tNode) {
const header = 'During serialization, Angular was unable to find an element in the DOM:\n\n';
const expected = `${describeExpectedDom(lView, tNode, false)}\n\n`;
const footer = getHydrationErrorFooter();
throw new RuntimeError(-502 /* RuntimeErrorCode.HYDRATION_MISSING_NODE */, header + expected + footer);
}
/**
* Builds a hydration error message when a node is not found at a path location
*
* @param host the Host Node
* @param path the path to the node
*/
export function nodeNotFoundAtPathError(host, path) {
const header = `During hydration Angular was unable to locate a node ` +
`using the "${path}" path, starting from the ${describeRNode(host)} node.\n\n`;
const footer = getHydrationErrorFooter();
throw new RuntimeError(-502 /* RuntimeErrorCode.HYDRATION_MISSING_NODE */, header + footer);
}
/**
* Builds the hydration error message in the case that dom nodes are created outside of
* the Angular context and are being used as projected nodes
*
* @param lView the LView
* @param tNode the TNode
* @returns an error
*/
export function unsupportedProjectionOfDomNodes(rNode) {
const header = 'During serialization, Angular detected DOM nodes ' +
'that were created outside of Angular context and provided as projectable nodes ' +
'(likely via `ViewContainerRef.createComponent` or `createComponent` APIs). ' +
'Hydration is not supported for such cases, consider refactoring the code to avoid ' +
'this pattern or using `ngSkipHydration` on the host element of the component.\n\n';
const actual = `${describeDomFromNode(rNode)}\n\n`;
const message = header + actual + getHydrationAttributeNote();
return new RuntimeError(-503 /* RuntimeErrorCode.UNSUPPORTED_PROJECTION_DOM_NODES */, message);
}
/**
* Builds the hydration error message in the case that ngSkipHydration was used on a
* node that is not a component host element or host binding
*
* @param rNode the HTML Element
* @returns an error
*/
export function invalidSkipHydrationHost(rNode) {
const header = 'The `ngSkipHydration` flag is applied on a node ' +
'that doesn\'t act as a component host. Hydration can be ' +
'skipped only on per-component basis.\n\n';
const actual = `${describeDomFromNode(rNode)}\n\n`;
const footer = 'Please move the `ngSkipHydration` attribute to the component host element.\n\n';
const message = header + actual + footer;
return new RuntimeError(-504 /* RuntimeErrorCode.INVALID_SKIP_HYDRATION_HOST */, message);
}
// Stringification methods
/**
* Stringifies a given TNode's attributes
*
* @param tNode a provided TNode
* @returns string
*/
function stringifyTNodeAttrs(tNode) {
const results = [];
if (tNode.attrs) {
for (let i = 0; i < tNode.attrs.length;) {
const attrName = tNode.attrs[i++];
// Once we reach the first flag, we know that the list of
// attributes is over.
if (typeof attrName == 'number') {
break;
}
const attrValue = tNode.attrs[i++];
results.push(`${attrName}="${shorten(attrValue)}"`);
}
}
return results.join(' ');
}
/**
* The list of internal attributes that should be filtered out while
* producing an error message.
*/
const internalAttrs = new Set(['ngh', 'ng-version', 'ng-server-context']);
/**
* Stringifies an HTML Element's attributes
*
* @param rNode an HTML Element
* @returns string
*/
function stringifyRNodeAttrs(rNode) {
const results = [];
for (let i = 0; i < rNode.attributes.length; i++) {
const attr = rNode.attributes[i];
if (internalAttrs.has(attr.name))
continue;
results.push(`${attr.name}="${shorten(attr.value)}"`);
}
return results.join(' ');
}
// Methods for Describing the DOM
/**
* Converts a tNode to a helpful readable string value for use in error messages
*
* @param tNode a given TNode
* @param innerContent the content of the node
* @returns string
*/
function describeTNode(tNode, innerContent = '…') {
switch (tNode.type) {
case 1 /* TNodeType.Text */:
const content = tNode.value ? `(${tNode.value})` : '';
return `#text${content}`;
case 2 /* TNodeType.Element */:
const attrs = stringifyTNodeAttrs(tNode);
const tag = tNode.value.toLowerCase();
return `<${tag}${attrs ? ' ' + attrs : ''}>${innerContent}</${tag}>`;
case 8 /* TNodeType.ElementContainer */:
return '<!-- ng-container -->';
case 4 /* TNodeType.Container */:
return '<!-- container -->';
default:
const typeAsString = getFriendlyStringFromTNodeType(tNode.type);
return `#node(${typeAsString})`;
}
}
/**
* Converts an RNode to a helpful readable string value for use in error messages
*
* @param rNode a given RNode
* @param innerContent the content of the node
* @returns string
*/
function describeRNode(rNode, innerContent = '…') {
const node = rNode;
switch (node.nodeType) {
case Node.ELEMENT_NODE:
const tag = node.tagName.toLowerCase();
const attrs = stringifyRNodeAttrs(node);
return `<${tag}${attrs ? ' ' + attrs : ''}>${innerContent}</${tag}>`;
case Node.TEXT_NODE:
const content = node.textContent ? shorten(node.textContent) : '';
return `#text${content ? `(${content})` : ''}`;
case Node.COMMENT_NODE:
return `<!-- ${shorten(node.textContent ?? '')} -->`;
default:
return `#node(${node.nodeType})`;
}
}
/**
* Builds the string containing the expected DOM present given the LView and TNode
* values for a readable error message
*
* @param lView the lView containing the DOM
* @param tNode the tNode
* @param isViewContainerAnchor boolean
* @returns string
*/
function describeExpectedDom(lView, tNode, isViewContainerAnchor) {
const spacer = ' ';
let content = '';
if (tNode.prev) {
content += spacer + '…\n';
content += spacer + describeTNode(tNode.prev) + '\n';
}
else if (tNode.type && tNode.type & 12 /* TNodeType.AnyContainer */) {
content += spacer + '…\n';
}
if (isViewContainerAnchor) {
content += spacer + describeTNode(tNode) + '\n';
content += spacer + `<!-- container --> ${AT_THIS_LOCATION}\n`;
}
else {
content += spacer + describeTNode(tNode) + ` ${AT_THIS_LOCATION}\n`;
}
content += spacer + '…\n';
const parentRNode = tNode.type ? getParentRElement(lView[TVIEW], tNode, lView) : null;
if (parentRNode) {
content = describeRNode(parentRNode, '\n' + content);
}
return content;
}
/**
* Builds the string containing the DOM present around a given RNode for a
* readable error message
*
* @param node the RNode
* @returns string
*/
function describeDomFromNode(node) {
const spacer = ' ';
let content = '';
const currentNode = node;
if (currentNode.previousSibling) {
content += spacer + '…\n';
content += spacer + describeRNode(currentNode.previousSibling) + '\n';
}
content += spacer + describeRNode(currentNode) + ` ${AT_THIS_LOCATION}\n`;
if (node.nextSibling) {
content += spacer + '…\n';
}
if (node.parentNode) {
content = describeRNode(currentNode.parentNode, '\n' + content);
}
return content;
}
/**
* Shortens the description of a given RNode by its type for readability
*
* @param nodeType the type of node
* @param tagName the node tag name
* @param textContent the text content in the node
* @returns string
*/
function shortRNodeDescription(nodeType, tagName, textContent) {
switch (nodeType) {
case Node.ELEMENT_NODE:
return `<${tagName.toLowerCase()}>`;
case Node.TEXT_NODE:
const content = textContent ? ` (with the "${shorten(textContent)}" content)` : '';
return `a text node${content}`;
case Node.COMMENT_NODE:
return 'a comment node';
default:
return `#node(nodeType=${nodeType})`;
}
}
/**
* Builds the footer hydration error message
*
* @param componentClassName the name of the component class
* @returns string
*/
function getHydrationErrorFooter(componentClassName) {
const componentInfo = componentClassName ? `the "${componentClassName}"` : 'corresponding';
return `To fix this problem:\n` +
` * check ${componentInfo} component for hydration-related issues\n` +
` * check to see if your template has valid HTML structure\n` +
` * or skip hydration by adding the \`ngSkipHydration\` attribute ` +
`to its host node in a template\n\n`;
}
/**
* An attribute related note for hydration errors
*/
function getHydrationAttributeNote() {
return 'Note: attributes are only displayed to better represent the DOM' +
' but have no effect on hydration mismatches.\n\n';
}
// Node string utility functions
/**
* Strips all newlines out of a given string
*
* @param input a string to be cleared of new line characters
* @returns
*/
function stripNewlines(input) {
return input.replace(/\s+/gm, '');
}
/**
* Reduces a string down to a maximum length of characters with ellipsis for readability
*
* @param input a string input
* @param maxLength a maximum length in characters
* @returns string
*/
function shorten(input, maxLength = 50) {
if (!input) {
return '';
}
input = stripNewlines(input);
return input.length > maxLength ? `${input.substring(0, maxLength - 1)}…` : input;
}
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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\nimport {RuntimeError, RuntimeErrorCode} from '../errors';\nimport {getDeclarationComponentDef} from '../render3/instructions/element_validation';\nimport {TNode, TNodeType} from '../render3/interfaces/node';\nimport {RNode} from '../render3/interfaces/renderer_dom';\nimport {LView, TVIEW} from '../render3/interfaces/view';\nimport {getParentRElement} from '../render3/node_manipulation';\n\nconst AT_THIS_LOCATION = '<-- AT THIS LOCATION';\n\n/**\n * Retrieves a user friendly string for a given TNodeType for use in\n * friendly error messages\n *\n * @param tNodeType\n * @returns\n */\nfunction getFriendlyStringFromTNodeType(tNodeType: TNodeType): string {\n  switch (tNodeType) {\n    case TNodeType.Container:\n      return 'view container';\n    case TNodeType.Element:\n      return 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Validates that a given node has sibling nodes\n */\nexport function validateSiblingNodeExists(node: RNode|null): void {\n  validateNodeExists(node);\n  if (!node!.nextSibling) {\n    const header = 'During hydration Angular expected more sibling nodes to be present.\\n\\n';\n    const actual = `Actual DOM is:\\n\\n${describeDomFromNode(node!)}\\n\\n`;\n    const footer = getHydrationErrorFooter();\n\n    const message = header + actual + footer;\n    throw new RuntimeError(RuntimeErrorCode.HYDRATION_MISSING_SIBLINGS, message);\n  }\n}\n\n/**\n * Validates that a node exists or throws\n */\nexport function validateNodeExists(\n    node: RNode|null, lView: LView|null = null, tNode: TNode|null = null): void {\n  if (!node) {\n    const header =\n        'During hydration, Angular expected an element to be present at this location.\\n\\n';\n    let expected = '';\n    let footer = '';\n    if (lView !== null && tNode !== null) {\n      expected = `${describeExpectedDom(lView, tNode, false)}\\n\\n`;\n      footer = getHydrationErrorFooter();\n    }\n    throw new RuntimeError(RuntimeErrorCode.HYDRATION_MISSING_NODE, header + expected + footer);\n  }\n}\n\n/**\n * Builds the hydration error message when a node is not found\n *\n * @param lView the LView where the node exists\n * @param tNode the TNode\n */\nexport function nodeNotFoundError(lView: LView, tNode: TNode): Error {\n  const header = 'During serialization, Angular was unable to find an element in the DOM:\\n\\n';\n  const expected = `${describeExpectedDom(lView, tNode, false)}\\n\\n`;\n  const footer = getHydrationErrorFooter();\n\n  throw new RuntimeError(RuntimeErrorCode.HYDRATION_MISSING_NODE, header + expected + footer);\n}\n\n/**\n * Builds a hydration error message when a node is not found at a path location\n *\n * @param host the Host Node\n * @param path the path to the node\n */\nexport function nodeNotFoundAtPathError(host: Node, path: string): Error {\n  const header = `During hydration Angular was unable to locate a node ` +\n      `using the \"${path}\" path, starting from the ${describeRNode(host)} node.\\n\\n`;\n  const footer = getHydrationErrorFooter();\n\n  throw new RuntimeError(RuntimeErrorCode.HYDRATION_MISSING_NODE, header + footer);\n}\n\n\n/**\n * Builds the hydration error message in the case that dom nodes are created outside of\n * the Angular context and are being used as projected nodes\n *\n * @param lView the LView\n * @param tNode the TNode\n * @returns an error\n */\nexport function unsupportedProjectionOfDomNodes(rNode: RNode): Error {\n  const header = 'During serialization, Angular detected DOM nodes ' +\n      'that were created outside of Angular context and provided as projectable nodes ' +\n      '(likely via `ViewContainerRef.createComponent` or `createComponent` APIs). ' +\n      'Hydration is not supported for such cases, consider refactoring the code to avoid ' +\n      'this pattern or using `ngSkipHydration` on the host element of the component.\\n\\n';\n  const actual = `${describeDomFromNode(rNode)}\\n\\n`;\n  const message = header + actual + getHydrationAttributeNote();\n  return new RuntimeError(RuntimeErrorCode.UNSUPPORTED_PROJECTION_DOM_NODES, message);\n}\n\n/**\n * Builds the hydration error message in the case that ngSkipHydration was used on a\n * node that is not a component host element or host binding\n *\n * @param rNode the HTML Element\n * @returns an error\n */\nexport function invalidSkipHydrationHost(rNode: RNode): Error {\n  const header = 'The `ngSkipHydration` flag is applied on a node ' +\n      'that doesn\\'t act as a component host. Hydration can be ' +\n      'skipped only on per-component basis.\\n\\n';\n  const actual = `${describeDomFromNode(rNode)}\\n\\n`;\n  const footer = 'Please move the `ngSkipHydration` attribute to the component host element.\\n\\n';\n  const message = header + actual + footer;\n  return new RuntimeError(RuntimeErrorCode.INVALID_SKIP_HYDRATION_HOST, message);\n}\n\n// Stringification methods\n\n/**\n * Stringifies a given TNode's attributes\n *\n * @param tNode a provided TNode\n * @returns string\n */\nfunction stringifyTNodeAttrs(tNode: TNode): string {\n  const results = [];\n  if (tNode.attrs) {\n    for (let i = 0; i < tNode.attrs.length;) {\n      const attrName = tNode.attrs[i++];\n      // Once we reach the first flag, we know that the list of\n      // attributes is over.\n      if (typeof attrName == 'number') {\n        break;\n      }\n      const attrValue = tNode.attrs[i++];\n      results.push(`${attrName}=\"${shorten(attrValue as string)}\"`);\n    }\n  }\n  return results.join(' ');\n}\n\n/**\n * The list of internal attributes that should be filtered out while\n * producing an error message.\n */\nconst internalAttrs = new Set(['ngh', 'ng-version', 'ng-server-context']);\n\n/**\n * Stringifies an HTML Element's attributes\n *\n * @param rNode an HTML Element\n * @returns string\n */\nfunction stringifyRNodeAttrs(rNode: HTMLElement): string {\n  const results = [];\n  for (let i = 0; i < rNode.attributes.length; i++) {\n    const attr = rNode.attributes[i];\n    if (internalAttrs.has(attr.name)) continue;\n    results.push(`${attr.name}=\"${shorten(attr.value)}\"`);\n  }\n  return results.join(' ');\n}\n\n// Methods for Describing the DOM\n\n/**\n * Converts a tNode to a helpful readable string value for use in error messages\n *\n * @param tNode a given TNode\n * @param innerContent the content of the node\n * @returns string\n */\nfunction describeTNode(tNode: TNode, innerContent: string = '…'): string {\n  switch (tNode.type) {\n    case TNodeType.Text:\n      const content = tNode.value ? `(${tNode.value})` : '';\n      return `#text${content}`;\n    case TNodeType.Element:\n      const attrs = stringifyTNodeAttrs(tNode);\n      const tag = tNode.value.toLowerCase();\n      return `<${tag}${attrs ? ' ' + attrs : ''}>${innerContent}</${tag}>`;\n    case TNodeType.ElementContainer:\n      return '<!-- ng-container -->';\n    case TNodeType.Container:\n      return '<!-- container -->';\n    default:\n      const typeAsString = getFriendlyStringFromTNodeType(tNode.type);\n      return `#node(${typeAsString})`;\n  }\n}\n\n/**\n * Converts an RNode to a helpful readable string value for use in error messages\n *\n * @param rNode a given RNode\n * @param innerContent the content of the node\n * @returns string\n */\nfunction describeRNode(rNode: RNode, innerContent: string = '…'): string {\n  const node = rNode as HTMLElement;\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE:\n      const tag = node.tagName!.toLowerCase();\n      const attrs = stringifyRNodeAttrs(node);\n      return `<${tag}${attrs ? ' ' + attrs : ''}>${innerContent}</${tag}>`;\n    case Node.TEXT_NODE:\n      const content = node.textContent ? shorten(node.textContent) : '';\n      return `#text${content ? `(${content})` : ''}`;\n    case Node.COMMENT_NODE:\n      return `<!-- ${shorten(node.textContent ?? '')} -->`;\n    default:\n      return `#node(${node.nodeType})`;\n  }\n}\n\n/**\n * Builds the string containing the expected DOM present given the LView and TNode\n * values for a readable error message\n *\n * @param lView the lView containing the DOM\n * @param tNode the tNode\n * @param isViewContainerAnchor boolean\n * @returns string\n */\nfunction describeExpectedDom(lView: LView, tNode: TNode, isViewContainerAnchor: boolean): string {\n  const spacer = '  ';\n  let content = '';\n  if (tNode.prev) {\n    content += spacer + '…\\n';\n    content += spacer + describeTNode(tNode.prev) + '\\n';\n  } else if (tNode.type && tNode.type & TNodeType.AnyContainer) {\n    content += spacer + '…\\n';\n  }\n  if (isViewContainerAnchor) {\n    content += spacer + describeTNode(tNode) + '\\n';\n    content += spacer + `<!-- container -->  ${AT_THIS_LOCATION}\\n`;\n  } else {\n    content += spacer + describeTNode(tNode) + `  ${AT_THIS_LOCATION}\\n`;\n  }\n  content += spacer + '…\\n';\n\n  const parentRNode = tNode.type ? getParentRElement(lView[TVIEW], tNode, lView) : null;\n  if (parentRNode) {\n    content = describeRNode(parentRNode as unknown as Node, '\\n' + content);\n  }\n  return content;\n}\n\n/**\n * Builds the string containing the DOM present around a given RNode for a\n * readable error message\n *\n * @param node the RNode\n * @returns string\n */\nfunction describeDomFromNode(node: RNode): string {\n  const spacer = '  ';\n  let content = '';\n  const currentNode = node as HTMLElement;\n  if (currentNode.previousSibling) {\n    content += spacer + '…\\n';\n    content += spacer + describeRNode(currentNode.previousSibling) + '\\n';\n  }\n  content += spacer + describeRNode(currentNode) + `  ${AT_THIS_LOCATION}\\n`;\n  if (node.nextSibling) {\n    content += spacer + '…\\n';\n  }\n  if (node.parentNode) {\n    content = describeRNode(currentNode.parentNode as Node, '\\n' + content);\n  }\n  return content;\n}\n\n/**\n * Shortens the description of a given RNode by its type for readability\n *\n * @param nodeType the type of node\n * @param tagName the node tag name\n * @param textContent the text content in the node\n * @returns string\n */\nfunction shortRNodeDescription(\n    nodeType: number, tagName: string|null, textContent: string|null): string {\n  switch (nodeType) {\n    case Node.ELEMENT_NODE:\n      return `<${tagName!.toLowerCase()}>`;\n    case Node.TEXT_NODE:\n      const content = textContent ? ` (with the \"${shorten(textContent)}\" content)` : '';\n      return `a text node${content}`;\n    case Node.COMMENT_NODE:\n      return 'a comment node';\n    default:\n      return `#node(nodeType=${nodeType})`;\n  }\n}\n\n\n/**\n * Builds the footer hydration error message\n *\n * @param componentClassName the name of the component class\n * @returns string\n */\nfunction getHydrationErrorFooter(componentClassName?: string): string {\n  const componentInfo = componentClassName ? `the \"${componentClassName}\"` : 'corresponding';\n  return `To fix this problem:\\n` +\n      `  * check ${componentInfo} component for hydration-related issues\\n` +\n      `  * check to see if your template has valid HTML structure\\n` +\n      `  * or skip hydration by adding the \\`ngSkipHydration\\` attribute ` +\n      `to its host node in a template\\n\\n`;\n}\n\n/**\n * An attribute related note for hydration errors\n */\nfunction getHydrationAttributeNote(): string {\n  return 'Note: attributes are only displayed to better represent the DOM' +\n      ' but have no effect on hydration mismatches.\\n\\n';\n}\n\n// Node string utility functions\n\n/**\n * Strips all newlines out of a given string\n *\n * @param input a string to be cleared of new line characters\n * @returns\n */\nfunction stripNewlines(input: string): string {\n  return input.replace(/\\s+/gm, '');\n}\n\n/**\n * Reduces a string down to a maximum length of characters with ellipsis for readability\n *\n * @param input a string input\n * @param maxLength a maximum length in characters\n * @returns string\n */\nfunction shorten(input: string|null, maxLength = 50): string {\n  if (!input) {\n    return '';\n  }\n  input = stripNewlines(input);\n  return input.length > maxLength ? `${input.substring(0, maxLength - 1)}…` : input;\n}\n"]}