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'import' : binding.kind === 'derived' ? 'derived state' : 'constant'; if (is_binding) { e.constant_binding(node, thing); } else { e.constant_assignment(node, thing); } } } } /** * Validates that the opening of a control flow block is `{` immediately followed by the expected character. * In legacy mode whitespace is allowed inbetween. TODO remove once legacy mode is gone and move this into parser instead. * @param {{start: number; end: number}} node * @param {AnalysisState} state * @param {string} expected */ export function validate_opening_tag(node, state, expected) { if (state.analysis.source[node.start + 1] !== expected) { // avoid a sea of red and only mark the first few characters e.block_unexpected_character({ start: node.start, end: node.start + 5 }, expected); } } /** * @param {AST.Fragment | null | undefined} node * @param {Context} context */ export function validate_block_not_empty(node, context) { if (!node) return; // Assumption: If the block has zero elements, someone's in the middle of typing it out, // so don't warn in that case because it would be distracting. if (node.nodes.length === 1 && node.nodes[0].type === 'Text' && !node.nodes[0].raw.trim()) { w.block_empty(node.nodes[0]); } } /** * @param {VariableDeclarator} node * @param {AnalysisState} state */ export function ensure_no_module_import_conflict(node, state) { const ids = extract_identifiers(node.id); for (const id of ids) { if ( state.ast_type === 'instance' && state.scope === state.analysis.instance.scope && state.analysis.module.scope.get(id.name)?.declaration_kind === 'import' ) { // TODO fix the message here e.declaration_duplicate_module_import(node.id); } } } /** * A 'safe' identifier means that the `foo` in `foo.bar` or `foo()` will not * call functions that require component context to exist * @param {Expression | Super} expression * @param {Scope} scope */ export function is_safe_identifier(expression, scope) { let node = expression; while (node.type === 'MemberExpression') node = node.object; if (node.type !== 'Identifier') return false; const binding = scope.get(node.name); if (!binding) return true; if (binding.kind === 'store_sub') { return is_safe_identifier({ name: node.name.slice(1), type: 'Identifier' }, scope); } return ( binding.declaration_kind !== 'import' && binding.kind !== 'prop' && binding.kind !== 'bindable_prop' && binding.kind !== 'rest_prop' ); } /** * @param {Expression | Super} node * @param {Context} context * @returns {boolean} */ export function is_pure(node, context) { if (node.type !== 'Identifier' && node.type !== 'MemberExpression') { return false; } const left = object(node); if (!left) return false; if (left.type === 'Identifier') { const binding = context.state.scope.get(left.name); if (binding === null) return true; // globals are assumed to be safe } // TODO add more cases (safe Svelte imports, etc) return false; } /** * Checks if the name is valid, which it is when it's not starting with (or is) a dollar sign or if it's a function parameter. * The second argument is the depth of the scope, which is there for backwards compatibility reasons: In Svelte 4, you * were allowed to define `$`-prefixed variables anywhere below the top level of components. Once legacy mode is gone, this * argument can be removed / the call sites adjusted accordingly. * @param {Binding | null} binding * @param {number | undefined} [function_depth] */ export function validate_identifier_name(binding, function_depth) { if (!binding) return; const declaration_kind = binding.declaration_kind; if ( declaration_kind !== 'synthetic' && declaration_kind !== 'param' && declaration_kind !== 'rest_param' && (!function_depth || function_depth <= 1) ) { const node = binding.node; if (node.name === '$') { e.dollar_binding_invalid(node); } else if (node.name.startsWith('$')) { e.dollar_prefix_invalid(node); } } } |