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// @flow strict
import { GraphQLError } from '../../error/GraphQLError';
import type { ASTVisitor } from '../../language/visitor';
import type { ValidationContext } from '../ValidationContext';
/**
* No undefined variables
*
* A GraphQL operation is only valid if all variables encountered, both directly
* and via fragment spreads, are defined by that operation.
*/
export function NoUndefinedVariablesRule(
context: ValidationContext,
): ASTVisitor {
let variableNameDefined = Object.create(null);
return {
OperationDefinition: {
enter() {
variableNameDefined = Object.create(null);
},
leave(operation) {
const usages = context.getRecursiveVariableUsages(operation);
for (const { node } of usages) {
const varName = node.name.value;
if (variableNameDefined[varName] !== true) {
context.reportError(
new GraphQLError(
operation.name
? `Variable "$${varName}" is not defined by operation "${operation.name.value}".`
: `Variable "$${varName}" is not defined.`,
[node, operation],
),
);
}
}
},
},
VariableDefinition(node) {
variableNameDefined[node.variable.name.value] = true;
},
};
}
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