is_safe_identifier() — svelte Function Reference

Architecture documentation for the is_safe_identifier() function in utils.js from the svelte codebase.

Function javascript Compiler Transformer calls 1 called by 2

Entity Profile

Compiler→ Transformer→ is_safe_identifier() — svelte Function Reference

Dependency Diagram

graph TD
  e40e188e_6def_6359_11b9_9532abe99b8d["is_safe_identifier()"]
  bf0d8f1b_17da_970d_bf44_fbcf099d5371["utils.js"]
  e40e188e_6def_6359_11b9_9532abe99b8d -->|defined in| bf0d8f1b_17da_970d_bf44_fbcf099d5371
  f847bd70_7e16_ed37_5fde_c34cd0ce1d43["CallExpression()"]
  f847bd70_7e16_ed37_5fde_c34cd0ce1d43 -->|calls| e40e188e_6def_6359_11b9_9532abe99b8d
  4123505d_2086_d0a0_2e0e_a28cc51de65e["MemberExpression()"]
  4123505d_2086_d0a0_2e0e_a28cc51de65e -->|calls| e40e188e_6def_6359_11b9_9532abe99b8d
  627dc2f8_4dbc_5bb1_8f54_cee503e17098["get()"]
  e40e188e_6def_6359_11b9_9532abe99b8d -->|calls| 627dc2f8_4dbc_5bb1_8f54_cee503e17098
  style e40e188e_6def_6359_11b9_9532abe99b8d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/compiler/phases/2-analyze/visitors/shared/utils.js lines 176–195

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'
	);
}