mirror of
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23 lines
808 B
JavaScript
23 lines
808 B
JavaScript
const passiveEventListenerNames = new Set(['touchstart', 'touchmove', 'wheel', 'mousewheel'])
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const propIsPassiveTrue = prop => prop.key && prop.key.name === 'passive' && prop.value && prop.value.value === true
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module.exports = {
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meta: {
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docs: {}
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},
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create(context) {
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return {
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['CallExpression[callee.property.name="addEventListener"]']: function(node) {
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const [name, listener, options] = node.arguments
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if (!listener) return
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if (name.type !== 'Literal') return
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if (!passiveEventListenerNames.has(name.value)) return
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if (options && options.type === 'ObjectExpression' && options.properties.some(propIsPassiveTrue)) return
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context.report(node, `High Frequency Events like "${name.value}" should be \`passive: true\``)
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}
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}
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}
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}
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