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46 lines
1.4 KiB
46 lines
1.4 KiB
import { inspect } from '../../jsutils/inspect.mjs'; |
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import { GraphQLError } from '../../error/GraphQLError.mjs'; |
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import { getNamedType, isLeafType } from '../../type/definition.mjs'; |
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/** |
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* Scalar leafs |
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* |
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* A GraphQL document is valid only if all leaf fields (fields without |
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* sub selections) are of scalar or enum types. |
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*/ |
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export function ScalarLeafsRule(context) { |
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return { |
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Field(node) { |
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const type = context.getType(); |
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const selectionSet = node.selectionSet; |
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if (type) { |
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if (isLeafType(getNamedType(type))) { |
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if (selectionSet) { |
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const fieldName = node.name.value; |
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const typeStr = inspect(type); |
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context.reportError( |
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new GraphQLError( |
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`Field "${fieldName}" must not have a selection since type "${typeStr}" has no subfields.`, |
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{ |
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nodes: selectionSet, |
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}, |
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), |
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); |
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} |
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} else if (!selectionSet) { |
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const fieldName = node.name.value; |
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const typeStr = inspect(type); |
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context.reportError( |
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new GraphQLError( |
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`Field "${fieldName}" of type "${typeStr}" must have a selection of subfields. Did you mean "${fieldName} { ... }"?`, |
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{ |
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nodes: node, |
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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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}
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