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Bail out if not a delegated event. if (!handler || !is_delegated(event_name)) { return null; } // If we are not working with a RegularElement, then bail out. const element = context.path.at(-1); if (element?.type !== 'RegularElement') { return null; } /** @type {FunctionExpression | FunctionDeclaration | ArrowFunctionExpression | null} */ let target_function = null; let binding = null; if (element.metadata.has_spread) { // event attribute becomes part of the dynamic spread array return unhoisted; } if (handler.type === 'ArrowFunctionExpression' || handler.type === 'FunctionExpression') { target_function = handler; } else if (handler.type === 'Identifier') { binding = context.state.scope.get(handler.name); if (context.state.analysis.module.scope.references.has(handler.name)) { // If a binding with the same name is referenced in the module scope (even if not declared there), bail out return unhoisted; } if (binding != null) { for (const { path } of binding.references) { const parent = path.at(-1); if (parent === undefined) return unhoisted; const grandparent = path.at(-2); /** @type {AST.RegularElement | null} */ let element = null; /** @type {string | null} */ let event_name = null; if (parent.type === 'OnDirective') { element = /** @type {AST.RegularElement} */ (grandparent); event_name = parent.name; } else if ( parent.type === 'ExpressionTag' && grandparent?.type === 'Attribute' && is_event_attribute(grandparent) ) { element = /** @type {AST.RegularElement} */ (path.at(-3)); const attribute = /** @type {AST.Attribute} */ (grandparent); event_name = get_attribute_event_name(attribute.name); } if (element && event_name) { if ( element.type !== 'RegularElement' || element.metadata.has_spread || !is_delegated(event_name) ) { return unhoisted; } } else if (parent.type !== 'FunctionDeclaration' && parent.type !== 'VariableDeclarator') { return unhoisted; } } } // If the binding is exported, bail out if (context.state.analysis.exports.find((node) => node.name === handler.name)) { return unhoisted; } if (binding !== null && binding.initial !== null && !binding.updated && !binding.is_called) { const binding_type = binding.initial.type; if ( binding_type === 'ArrowFunctionExpression' || binding_type === 'FunctionDeclaration' || binding_type === 'FunctionExpression' ) { target_function = binding.initial; } } } // If we can't find a function, or the function has multiple parameters, bail out if (target_function == null || target_function.params.length > 1) { return unhoisted; } const visited_references = new Set(); const scope = target_function.metadata.scope; for (const [reference] of scope.references) { // Bail out if the arguments keyword is used or $host is referenced if (reference === 'arguments' || reference === '$host') return unhoisted; // Bail out if references a store subscription if (scope.get(`$${reference}`)?.kind === 'store_sub') return unhoisted; const binding = scope.get(reference); const local_binding = context.state.scope.get(reference); // If we are referencing a binding that is shadowed in another scope then bail out. if (local_binding !== null && binding !== null && local_binding.node !== binding.node) { return unhoisted; } // If we have multiple references to the same store using $ prefix, bail out. if ( binding !== null && binding.kind === 'store_sub' && visited_references.has(reference.slice(1)) ) { return unhoisted; } // If we reference the index within an each block, then bail out. if (binding !== null && binding.initial?.type === 'EachBlock') return unhoisted; if ( binding !== null && // Bail out if the the binding is a rest param (binding.declaration_kind === 'rest_param' || // Bail out if we reference anything from the EachBlock (for now) that mutates in non-runes mode, (((!context.state.analysis.runes && binding.kind === 'each') || // or any normal not reactive bindings that are mutated. binding.kind === 'normal') && binding.updated)) ) { return unhoisted; } visited_references.add(reference); } return { hoisted: true, function: target_function }; } /** * @param {string} event_name */ function get_attribute_event_name(event_name) { event_name = event_name.slice(2); if (is_capture_event(event_name)) { event_name = event_name.slice(0, -7); } return event_name; } |