lowerIdentifierForAssignment() — react Function Reference

Source Code

compiler/packages/babel-plugin-react-compiler/src/HIR/BuildHIR.ts lines 3614–3658

function lowerIdentifierForAssignment(
  builder: HIRBuilder,
  loc: SourceLocation,
  kind: InstructionKind,
  path: NodePath<t.Identifier>,
): Place | {kind: 'Global'; name: string} | null {
  const binding = builder.resolveIdentifier(path);
  if (binding.kind !== 'Identifier') {
    if (kind === InstructionKind.Reassign) {
      return {kind: 'Global', name: path.node.name};
    } else {
      // Else its an internal error bc we couldn't find the binding
      builder.errors.push({
        reason: `(BuildHIR::lowerAssignment) Could not find binding for declaration.`,
        category: ErrorCategory.Invariant,
        loc: path.node.loc ?? null,
        suggestions: null,
      });
      return null;
    }
  } else if (
    binding.bindingKind === 'const' &&
    kind === InstructionKind.Reassign
  ) {
    builder.errors.push({
      reason: `Cannot reassign a \`const\` variable`,
      category: ErrorCategory.Syntax,
      loc: path.node.loc ?? null,
      description:
        binding.identifier.name != null
          ? `\`${binding.identifier.name.value}\` is declared as const`
          : null,
    });
    return null;
  }

  const place: Place = {
    kind: 'Identifier',
    identifier: binding.identifier,
    effect: Effect.Unknown,
    reactive: false,
    loc,
  };
  return place;
}