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feat(@ngtools/webpack): add automated preconnects for image domains
use TypeScript AST to find image domains and add preconnects to generated index.html
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126 changes: 126 additions & 0 deletions
126
packages/ngtools/webpack/src/transformers/find_image_domains.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| /** | ||
| * @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 * as ts from 'typescript'; | ||
|
|
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| const TARGET_TEXT = '@NgModule'; | ||
| const BUILTIN_LOADERS = new Set([ | ||
| 'provideCloudflareLoader', | ||
| 'provideCloudinaryLoader', | ||
| 'provideImageKitLoader', | ||
| 'provideImgixLoader', | ||
| ]); | ||
| const URL_REGEX = /(https?:\/\/[^/]*)\//g; | ||
|
|
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| export function findImageDomains(imageDomains: Set<string>): ts.TransformerFactory<ts.SourceFile> { | ||
| return (context: ts.TransformationContext) => { | ||
| return (sourceFile: ts.SourceFile) => { | ||
| const isBuiltinImageLoader = (node: ts.CallExpression): Boolean => { | ||
| return BUILTIN_LOADERS.has(node.expression.getText()); | ||
| }; | ||
|
|
||
| const findDomainString = (node: ts.Node) => { | ||
| if ( | ||
| ts.isStringLiteral(node) || | ||
| ts.isTemplateHead(node) || | ||
| ts.isTemplateMiddle(node) || | ||
| ts.isTemplateTail(node) | ||
| ) { | ||
| const domain = node.text.match(URL_REGEX); | ||
| if (domain && domain[0]) { | ||
| imageDomains.add(domain[0]); | ||
|
|
||
| return node; | ||
| } | ||
| } | ||
| ts.visitEachChild(node, findDomainString, context); | ||
|
|
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| return node; | ||
| }; | ||
|
|
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| function isImageProviderKey(property: ts.ObjectLiteralElementLike): boolean { | ||
| return ( | ||
| ts.isPropertyAssignment(property) && | ||
| property.name.getText() === 'provide' && | ||
| property.initializer.getText() === 'IMAGE_LOADER' | ||
| ); | ||
| } | ||
|
|
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| function isImageProviderValue(property: ts.ObjectLiteralElementLike): boolean { | ||
| return ts.isPropertyAssignment(property) && property.name.getText() === 'useValue'; | ||
| } | ||
|
|
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| function checkForDomain(node: ts.ObjectLiteralExpression) { | ||
| if (node.properties.find(isImageProviderKey)) { | ||
| const value = node.properties.find(isImageProviderValue); | ||
| if (value && ts.isPropertyAssignment(value)) { | ||
| if ( | ||
| ts.isArrowFunction(value.initializer) || | ||
| ts.isFunctionExpression(value.initializer) | ||
| ) { | ||
| ts.visitEachChild(node, findDomainString, context); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| function findImageLoaders(node: ts.Node) { | ||
| if (ts.isCallExpression(node)) { | ||
| if (isBuiltinImageLoader(node)) { | ||
| const firstArg = node.arguments[0]; | ||
| if (ts.isStringLiteralLike(firstArg)) { | ||
| imageDomains.add(firstArg.text); | ||
| } | ||
| } | ||
| } else if (ts.isObjectLiteralExpression(node)) { | ||
| checkForDomain(node); | ||
| } | ||
|
|
||
| return node; | ||
| } | ||
|
|
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| function findPropertyAssignment(node: ts.Node) { | ||
| if (ts.isPropertyAssignment(node)) { | ||
| if (ts.isIdentifier(node.name) && node.name.escapedText === 'providers') { | ||
| ts.visitEachChild(node.initializer, findImageLoaders, context); | ||
| } | ||
| } | ||
|
|
||
| return node; | ||
| } | ||
|
|
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| function findPropertyDeclaration(node: ts.Node) { | ||
| if ( | ||
| ts.isPropertyDeclaration(node) && | ||
| ts.isIdentifier(node.name) && | ||
| node.name.escapedText === 'ɵinj' && | ||
| node.initializer && | ||
| ts.isCallExpression(node.initializer) && | ||
| node.initializer.arguments[0] | ||
| ) { | ||
| ts.visitEachChild(node.initializer.arguments[0], findPropertyAssignment, context); | ||
| } | ||
|
|
||
| return node; | ||
| } | ||
|
|
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| // Continue traversal if node is ClassDeclaration and has name "AppModule" | ||
| function findClassDeclaration(node: ts.Node) { | ||
| if (ts.isClassDeclaration(node)) { | ||
| ts.visitEachChild(node, findPropertyDeclaration, context); | ||
| } | ||
|
|
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| return node; | ||
| } | ||
|
|
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| ts.visitEachChild(sourceFile, findClassDeclaration, context); | ||
|
|
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| return sourceFile; | ||
| }; | ||
| }; | ||
| } |
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