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45 lines
1.2 KiB
45 lines
1.2 KiB
import { GraphQLError } from '../../error/GraphQLError.mjs'; |
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/** |
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* No undefined variables |
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* |
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* A GraphQL operation is only valid if all variables encountered, both directly |
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* and via fragment spreads, are defined by that operation. |
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* |
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* See https://spec.graphql.org/draft/#sec-All-Variable-Uses-Defined |
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*/ |
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export function NoUndefinedVariablesRule(context) { |
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let variableNameDefined = Object.create(null); |
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return { |
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OperationDefinition: { |
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enter() { |
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variableNameDefined = Object.create(null); |
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}, |
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leave(operation) { |
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const usages = context.getRecursiveVariableUsages(operation); |
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for (const { node } of usages) { |
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const varName = node.name.value; |
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if (variableNameDefined[varName] !== true) { |
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context.reportError( |
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new GraphQLError( |
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operation.name |
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? `Variable "$${varName}" is not defined by operation "${operation.name.value}".` |
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: `Variable "$${varName}" is not defined.`, |
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{ |
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nodes: [node, operation], |
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}, |
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), |
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); |
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} |
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} |
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}, |
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}, |
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VariableDefinition(node) { |
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variableNameDefined[node.variable.name.value] = true; |
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}, |
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}; |
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}
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