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import * as e from '../../../errors.js'; import { get_parent, unwrap_optional } from '../../../utils/ast.js'; import { is_pure, is_safe_identifier } from './shared/utils.js'; /** * @param {CallExpression} node * @param {Context} context */ export function CallExpression(node, context) { const parent = /** @type {SvelteNode} */ (get_parent(context.path, -1)); const rune = get_rune(node, context.state.scope); switch (rune) { case null: if (!is_safe_identifier(node.callee, context.state.scope)) { context.state.analysis.needs_context = true; } break; case '$bindable': if (node.arguments.length > 1) { e.rune_invalid_arguments_length(node, '$bindable', 'zero or one arguments'); } if ( parent.type !== 'AssignmentPattern' || context.path.at(-3)?.type !== 'ObjectPattern' || context.path.at(-4)?.type !== 'VariableDeclarator' || get_rune( /** @type {VariableDeclarator} */ (context.path.at(-4)).init, context.state.scope ) !== '$props' ) { e.bindable_invalid_location(node); } break; case '$host': if (node.arguments.length > 0) { e.rune_invalid_arguments(node, '$host'); } else if (context.state.ast_type === 'module' || !context.state.analysis.custom_element) { e.host_invalid_placement(node); } break; case '$props': if (context.state.has_props_rune) { e.props_duplicate(node); } context.state.has_props_rune = true; if ( parent.type !== 'VariableDeclarator' || context.state.ast_type !== 'instance' || context.state.scope !== context.state.analysis.instance.scope ) { e.props_invalid_placement(node); } if (node.arguments.length > 0) { e.rune_invalid_arguments(node, rune); } break; case '$state': case '$state.raw': case '$derived': case '$derived.by': if ( parent.type !== 'VariableDeclarator' && !(parent.type === 'PropertyDefinition' && !parent.static && !parent.computed) ) { e.state_invalid_placement(node, rune); } if ((rune === '$derived' || rune === '$derived.by') && node.arguments.length !== 1) { e.rune_invalid_arguments_length(node, rune, 'exactly one argument'); } else if (rune === '$state' && node.arguments.length > 1) { e.rune_invalid_arguments_length(node, rune, 'zero or one arguments'); } break; case '$effect': case '$effect.pre': if (parent.type !== 'ExpressionStatement') { e.effect_invalid_placement(node); } if (node.arguments.length !== 1) { e.rune_invalid_arguments_length(node, rune, 'exactly one argument'); } // `$effect` needs context because Svelte needs to know whether it should re-run // effects that invalidate themselves, and that's determined by whether we're in runes mode context.state.analysis.needs_context = true; break; case '$effect.tracking': if (node.arguments.length !== 0) { e.rune_invalid_arguments(node, rune); } break; case '$effect.root': if (node.arguments.length !== 1) { e.rune_invalid_arguments_length(node, rune, 'exactly one argument'); } break; case '$inspect': if (node.arguments.length < 1) { e.rune_invalid_arguments_length(node, rune, 'one or more arguments'); } break; case '$inspect().with': if (node.arguments.length !== 1) { e.rune_invalid_arguments_length(node, rune, 'exactly one argument'); } break; case '$state.snapshot': if (node.arguments.length !== 1) { e.rune_invalid_arguments_length(node, rune, 'exactly one argument'); } break; } if (context.state.render_tag) { // Find out which of the render tag arguments contains this call expression const arg_idx = unwrap_optional(context.state.render_tag.expression).arguments.findIndex( (arg) => arg === node || context.path.includes(arg) ); // -1 if this is the call expression of the render tag itself if (arg_idx !== -1) { context.state.render_tag.metadata.args_with_call_expression.add(arg_idx); } } if (node.callee.type === 'Identifier') { const binding = context.state.scope.get(node.callee.name); if (binding !== null) { binding.is_called = true; } } // `$inspect(foo)` or `$derived(foo) should not trigger the `static-state-reference` warning if (rune === '$inspect' || rune === '$derived') { context.next({ ...context.state, function_depth: context.state.function_depth + 1 }); } else { context.next(); } if (context.state.expression) { // TODO We assume that any dependencies are stateful, which isn't necessarily the case — see // https://github.com/sveltejs/svelte/issues/13266. This check also includes dependencies // outside the call expression itself (e.g. `{blah && pure()}`) resulting in additional // false positives, but for now we accept that trade-off if (!is_pure(node.callee, context) || context.state.expression.dependencies.size > 0) { context.state.expression.has_call = true; context.state.expression.has_state = true; } } } |