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svelte

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Cybernetically enhanced web apps

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/** @import { CallExpression, ClassBody, MethodDefinition, PropertyDefinition, StaticBlock } from 'estree' */ /** @import { Context } from '../types.js' */ import * as b from '#compiler/builders'; import { get_name } from '../../../nodes.js'; /** * @param {ClassBody} node * @param {Context} context */ export function ClassBody(node, context) { const state_fields = context.state.analysis.classes.get(node); if (!state_fields) { // in legacy mode, do nothing context.next(); return; } /** @type {Array<MethodDefinition | PropertyDefinition | StaticBlock>} */ const body = []; const child_state = { ...context.state, state_fields }; for (const [name, field] of state_fields) { if (name[0] === '#') { continue; } // insert backing fields for stuff declared in the constructor if ( field && field.node.type === 'AssignmentExpression' && (field.type === '$derived' || field.type === '$derived.by') ) { const member = b.member(b.this, field.key); body.push( b.prop_def(field.key, null), b.method('get', b.key(name), [], [b.return(b.call(member))]), b.method('set', b.key(name), [b.id('$$value')], [b.return(b.call(member, b.id('$$value')))]) ); } } // Replace parts of the class body for (const definition of node.body) { if (definition.type !== 'PropertyDefinition') { body.push( /** @type {MethodDefinition | StaticBlock} */ (context.visit(definition, child_state)) ); continue; } const name = get_name(definition.key); const field = name && state_fields.get(name); if (!field) { body.push(/** @type {PropertyDefinition} */ (context.visit(definition, child_state))); continue; } if (name[0] === '#' || field.type === '$state' || field.type === '$state.raw') { body.push(/** @type {PropertyDefinition} */ (context.visit(definition, child_state))); } else if (field.node === definition) { // $derived / $derived.by const member = b.member(b.this, field.key); body.push( b.prop_def( field.key, /** @type {CallExpression} */ (context.visit(field.value, child_state)) ), b.method('get', definition.key, [], [b.return(b.call(member))]), b.method('set', b.key(name), [b.id('$$value')], [b.return(b.call(member, b.id('$$value')))]) ); } } return { ...node, body }; }