53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
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const ampBoilerplateAttributes = [
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'amp-boilerplate',
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'amp4ads-boilerplate',
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'amp4email-boilerplate'
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];
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export function isAmpBoilerplate(node) {
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if (!node.attrs) {
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return false;
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}
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for (const attr of ampBoilerplateAttributes) {
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if (attr in node.attrs) {
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return true;
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}
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}
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return false;
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}
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export function isComment(content) {
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if (typeof content === 'string') {
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return content.trim().startsWith('<!--');
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}
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return false;
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}
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export function isConditionalComment(content) {
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return (content || '').trim().startsWith('<!--[if');
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}
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export function isStyleNode(node) {
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return node.tag === 'style' && !isAmpBoilerplate(node) && 'content' in node && node.content.length > 0;
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}
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export function extractCssFromStyleNode(node) {
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return Array.isArray(node.content) ? node.content.join(' ') : node.content;
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}
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export function isEventHandler(attributeName) {
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return attributeName && attributeName.slice && attributeName.slice(0, 2).toLowerCase() === 'on' && attributeName.length >= 5;
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}
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export async function optionalImport(moduleName) {
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try {
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const module = await import(moduleName);
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return module.default || module;
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} catch (e) {
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if (e.code === 'MODULE_NOT_FOUND' || e.code === 'ERR_MODULE_NOT_FOUND') {
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return null;
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}
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throw e;
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}
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}
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