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rules.js
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265 lines (217 loc) · 6.5 KB
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export const ElementWeights = {
META: 10,
TITLE: 9,
PRECONNECT: 8,
ASYNC_SCRIPT: 7,
IMPORT_STYLES: 6,
SYNC_SCRIPT: 5,
SYNC_STYLES: 4,
PRELOAD: 3,
DEFER_SCRIPT: 2,
PREFETCH_PRERENDER: 1,
OTHER: 0
};
export const ElementDetectors = {
META: isMeta,
TITLE: isTitle,
PRECONNECT: isPreconnect,
ASYNC_SCRIPT: isAsyncScript,
IMPORT_STYLES: isImportStyles,
SYNC_SCRIPT: isSyncScript,
SYNC_STYLES: isSyncStyles,
PRELOAD: isPreload,
DEFER_SCRIPT: isDeferScript,
PREFETCH_PRERENDER: isPrefetchPrerender
}
export const META_HTTP_EQUIV_KEYWORDS = [
'accept-ch',
'content-security-policy',
'content-type',
'default-style',
'delegate-ch',
'origin-trial',
'x-dns-prefetch-control'
];
export function isMeta(element, adapter) {
const tagName = adapter.getTagName(element);
// Check if it's a base element
if (tagName === 'base') {
return true;
}
// Check if it's a meta element with charset, viewport, or critical http-equiv
if (tagName !== 'meta') {
return false;
}
// Check for charset attribute
if (adapter.hasAttribute(element, 'charset')) {
return true;
}
// Check for viewport meta
const name = adapter.getAttribute(element, 'name');
if (name && name.toLowerCase() === 'viewport') {
return true;
}
// Check for critical http-equiv values
const httpEquiv = adapter.getAttribute(element, 'http-equiv');
if (httpEquiv) {
const normalizedValue = httpEquiv.toLowerCase();
return META_HTTP_EQUIV_KEYWORDS.includes(normalizedValue);
}
return false;
}
export function isTitle(element, adapter) {
return adapter.getTagName(element) === 'title';
}
export function isPreconnect(element, adapter) {
if (adapter.getTagName(element) !== 'link') {
return false;
}
const rel = adapter.getAttribute(element, 'rel');
return rel?.toLowerCase() === 'preconnect';
}
export function isAsyncScript(element, adapter) {
return adapter.getTagName(element) === 'script' &&
adapter.hasAttribute(element, 'src') &&
adapter.hasAttribute(element, 'async');
}
export function isImportStyles(element, adapter) {
const importRe = /@import/;
if (adapter.getTagName(element) === 'style') {
return importRe.test(adapter.getTextContent(element));
}
/* TODO: Support external stylesheets.
if (adapter.getTagName(element) === 'link' &&
adapter.getAttribute(element, 'rel')?.toLowerCase() === 'stylesheet' &&
adapter.hasAttribute(element, 'href')) {
let response = fetch(adapter.getAttribute(element, 'href'));
response = response.text();
return importRe.test(response);
} */
return false;
}
export function isSyncScript(element, adapter) {
// Must be a script element
if (adapter.getTagName(element) !== 'script') {
return false;
}
// Original selector: script:not([src][defer],[src][type=module],[src][async],[type*=json])
// This excludes scripts that match ANY of these compound conditions:
// Exclude: scripts with src AND defer
if (adapter.hasAttribute(element, 'src') && adapter.hasAttribute(element, 'defer')) {
return false;
}
// Exclude: scripts with src AND type=module
if (adapter.hasAttribute(element, 'src')) {
const type = adapter.getAttribute(element, 'type');
if (type && type.toLowerCase() === 'module') {
return false;
}
}
// Exclude: scripts with src AND async
if (adapter.hasAttribute(element, 'src') && adapter.hasAttribute(element, 'async')) {
return false;
}
// Exclude: scripts with type containing "json"
const type = adapter.getAttribute(element, 'type');
if (type && type.toLowerCase().includes('json')) {
return false;
}
return true;
}
export function isSyncStyles(element, adapter) {
const tagName = adapter.getTagName(element);
// Check if it's a style element
if (tagName === 'style') {
return true;
}
// Check if it's a stylesheet link
if (tagName === 'link') {
const rel = adapter.getAttribute(element, 'rel');
return rel?.toLowerCase() === 'stylesheet';
}
return false;
}
export function isPreload(element, adapter) {
if (adapter.getTagName(element) !== 'link') {
return false;
}
const rel = adapter.getAttribute(element, 'rel');
if (!rel) {
return false;
}
const relLower = rel.toLowerCase();
return relLower === 'preload' || relLower === 'modulepreload';
}
export function isDeferScript(element, adapter) {
if (adapter.getTagName(element) !== 'script') {
return false;
}
if (!adapter.hasAttribute(element, 'src')) {
return false;
}
// Script with defer attribute
if (adapter.hasAttribute(element, 'defer')) {
return true;
}
// Module scripts are defer by default, unless they have async
const type = adapter.getAttribute(element, 'type');
if (type && type.toLowerCase() === 'module') {
return !adapter.hasAttribute(element, 'async');
}
return false;
}
export function isPrefetchPrerender(element, adapter) {
if (adapter.getTagName(element) !== 'link') {
return false;
}
const rel = adapter.getAttribute(element, 'rel');
if (!rel) {
return false;
}
const relLower = rel.toLowerCase();
return relLower === 'prefetch' ||
relLower === 'dns-prefetch' ||
relLower === 'prerender';
}
export function isOriginTrial(element, adapter) {
if (adapter.getTagName(element) !== 'meta') {
return false;
}
const httpEquiv = adapter.getAttribute(element, 'http-equiv');
return httpEquiv?.toLowerCase() === 'origin-trial';
}
export function isMetaCSP(element, adapter) {
if (adapter.getTagName(element) !== 'meta') {
return false;
}
const httpEquiv = adapter.getAttribute(element, 'http-equiv');
if (!httpEquiv) {
return false;
}
const httpEquivLower = httpEquiv.toLowerCase();
return httpEquivLower === 'content-security-policy' ||
httpEquivLower === 'content-security-policy-report-only';
}
export function getWeight(element, adapter) {
for (let [id, detector] of Object.entries(ElementDetectors)) {
if (detector(element, adapter)) {
return ElementWeights[id];
}
}
return ElementWeights.OTHER;
}
export function getHeadWeights(head, adapter) {
const headChildren = adapter.getChildren(head);
return headChildren
.filter(element => {
// Filter out text nodes and comments - only include actual elements
const tagName = adapter.getTagName(element);
return tagName && tagName !== '';
})
.map(element => {
return {
element,
weight: getWeight(element, adapter)
};
});
}