Method errorIfWritingToReadonlyIndex

internal/checker/checker.go:27135–27139

(indexInfo *IndexInfo, objectType *Type, accessExpression *ast.Node)

}

func (c *Checker) errorIfWritingToReadonlyIndex(indexInfo *IndexInfo, objectType *Type, accessExpression *ast.Node) {
	if indexInfo != nil && indexInfo.isReadonly && accessExpression != nil && (ast.IsAssignmentTarget(accessExpression) || isDeleteTarget(accessExpression)) {
		c.error(accessExpression, diagnostics.Index_signature_in_type_0_only_permits_reading, c.TypeToString(objectType))
	}
}

func (c *Checker) isSelfTypeAccess(name *ast.Node, parent *ast.Symbol) bool {
	return name.Kind == ast.KindThisKeyword || parent != nil && ast.IsEntityNameExpression(name) && parent == c.getResolvedSymbol(ast.GetFirstIdentifier(name))