graphql
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A Query Language and Runtime which can target any service.
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@category Values */\n\nimport { inspect } from '../jsutils/inspect.ts';\nimport { invariant } from '../jsutils/invariant.ts';\nimport { isIterableObject } from '../jsutils/isIterableObject.ts';\nimport { isObjectLike } from '../jsutils/isObjectLike.ts';\nimport type { Maybe } from '../jsutils/Maybe.ts';\nimport type { ObjMap } from '../jsutils/ObjMap.ts';\n\nimport type { ValueNode, VariableNode } from '../language/ast.ts';\nimport { Kind } from '../language/kinds.ts';\n\nimport type {\n GraphQLDefaultInput,\n GraphQLInputType,\n} from '../type/definition.ts';\nimport {\n assertLeafType,\n isInputObjectType,\n isListType,\n isNonNullType,\n isRequiredInputField,\n} from '../type/definition.ts';\n\nimport type { FragmentVariableValues } from '../execution/collectFields.ts';\nimport type { VariableValues } from '../execution/values.ts';\n\nimport { replaceVariables } from './replaceVariables.ts';\n\n/**\n * Coerces a JavaScript value given a GraphQL Input Type.\n *\n * Returns `undefined` when the value could not be validly coerced according to\n * the provided type. Use `validateInputValue` when coercion diagnostics\n * are needed.\n * @param inputValue - JavaScript value to coerce.\n * @param type - GraphQL input type to coerce the value against.\n * @returns Coerced value, or undefined if coercion fails.\n * @example\n * ```ts\n * // Coerce runtime input values, returning undefined when coercion fails.\n * import {\n * GraphQLInputObjectType,\n * GraphQLInt,\n * GraphQLList,\n * GraphQLNonNull,\n * GraphQLString,\n * } from 'graphql/type';\n * import { coerceInputValue } from 'graphql/utilities';\n *\n * const ReviewInput = new GraphQLInputObjectType({\n * name: 'ReviewInput',\n * fields: {\n * stars: { type: new GraphQLNonNull(GraphQLInt) },\n * tags: { type: new GraphQLList(GraphQLString) },\n * },\n * });\n *\n * coerceInputValue({ stars: '5', tags: ['featured'] }, ReviewInput); // => { stars: 5, tags: ['featured'] }\n * coerceInputValue({ stars: 'bad' }, ReviewInput); // => undefined\n * ```\n */\nexport function coerceInputValue(\n inputValue: unknown,\n type: GraphQLInputType,\n): unknown {\n if (isNonNullType(type)) {\n if (inputValue == null) {\n return; // Invalid: intentionally return no value.\n }\n return coerceInputValue(inputValue, type.ofType);\n }\n\n if (inputValue == null) {\n return null; // Explicitly return the value null.\n }\n\n if (isListType(type)) {\n if (!isIterableObject(inputValue)) {\n // Lists accept a non-list value as a list of one.\n const coercedItem = coerceInputValue(inputValue, type.ofType);\n if (coercedItem === undefined) {\n return; // Invalid: intentionally return no value.\n }\n return [coercedItem];\n }\n const coercedValue = [];\n for (const itemValue of inputValue) {\n const coercedItem = coerceInputValue(itemValue, type.ofType);\n if (coercedItem === undefined) {\n return; // Invalid: intentionally return no value.\n }\n coercedValue.push(coercedItem);\n }\n return coercedValue;\n }\n\n if (isInputObjectType(type)) {\n if (!isObjectLike(inputValue) || Array.isArray(inputValue)) {\n return; // Invalid: intentionally return no value.\n }\n\n const coercedValue: ObjMap<unknown> = Object.create(null);\n const fieldDefs = type.getFields();\n let definedFieldCount = 0;\n for (const fieldName of Object.keys(inputValue)) {\n if (inputValue[fieldName] === undefined) {\n continue;\n }\n definedFieldCount++;\n if (!Object.hasOwn(fieldDefs, fieldName)) {\n return; // Invalid: intentionally return no value.\n }\n }\n for (const field of Object.values(fieldDefs)) {\n const fieldValue = inputValue[field.name];\n if (fieldValue === undefined) {\n if (isRequiredInputField(field)) {\n return; // Invalid: intentionally return no value.\n }\n const coercedDefaultValue = coerceDefaultValue(field);\n if (coercedDefaultValue !== undefined) {\n coercedValue[field.name] = coercedDefaultValue;\n }\n } else {\n const coercedField = coerceInputValue(fieldValue, field.type);\n if (coercedField === undefined) {\n return; // Invalid: intentionally return no value.\n }\n coercedValue[field.name] = coercedField;\n }\n }\n\n if (type.isOneOf) {\n const keys = Object.keys(coercedValue);\n if (definedFieldCount !== 1 || keys.length !== 1) {\n return; // Invalid: intentionally return no value.\n }\n\n const key = keys[0];\n const value = coercedValue[key];\n if (value === null) {\n return; // Invalid: intentionally return no value.\n }\n }\n\n return coercedValue;\n }\n\n const leafType = assertLeafType(type);\n\n try {\n return leafType.coerceInputValue(inputValue);\n } catch (_error) {\n // Invalid: ignore error and intentionally return no value.\n }\n}\n\n/**\n * Produces a coerced \"internal\" JavaScript value given a GraphQL Value AST.\n *\n * Returns `undefined` when the value could not be validly coerced according to\n * the provided type.\n * @param valueNode - GraphQL value AST node to coerce.\n * @param type - GraphQL input type to coerce the literal against.\n * @param variableValues - Operation variable values returned by getVariableValues.\n * @param fragmentVariableValues - Fragment variable values for the current fragment scope.\n * @returns Coerced value, or undefined if coercion fails.\n * @example\n * ```ts\n * // Coerce literal input values without variables.\n * import { parseValue } from 'graphql/language';\n * import {\n * GraphQLInputObjectType,\n * GraphQLInt,\n * GraphQLNonNull,\n * GraphQLString,\n * } from 'graphql/type';\n * import { coerceInputLiteral } from 'graphql/utilities';\n *\n * const ReviewInput = new GraphQLInputObjectType({\n * name: 'ReviewInput',\n * fields: {\n * stars: { type: new GraphQLNonNull(GraphQLInt) },\n * comment: { type: GraphQLString },\n * },\n * });\n *\n * coerceInputLiteral(\n * parseValue('{ stars: 5, comment: \"Loved it\" }'),\n * ReviewInput,\n * ); // => { stars: 5, comment: 'Loved it' }\n * coerceInputLiteral(parseValue('{ comment: \"Missing\" }'), ReviewInput); // => undefined\n * ```\n * @example\n * ```ts\n * // This variant resolves variable references using VariableValues from getVariableValues().\n * import assert from 'node:assert';\n * import { parse, parseValue } from 'graphql/language';\n * import { GraphQLInt } from 'graphql/type';\n * import { getVariableValues } from 'graphql/execution';\n * import { buildSchema, coerceInputLiteral } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * review(stars: Int): String\n * }\n * `);\n * const document = parse('query ($stars: Int = 5) { review(stars: $stars) }');\n * const operation = document.definitions[0];\n * const result = getVariableValues(schema, operation.variableDefinitions, {\n * stars: '4',\n * });\n *\n * assert('variableValues' in result);\n *\n * coerceInputLiteral(parseValue('$stars'), GraphQLInt, result.variableValues); // => 4\n * ```\n */\nexport function coerceInputLiteral(\n valueNode: ValueNode,\n type: GraphQLInputType,\n variableValues?: Maybe<VariableValues>,\n fragmentVariableValues?: Maybe<FragmentVariableValues>,\n): unknown {\n if (valueNode.kind === Kind.VARIABLE) {\n const coercedVariableValue = getCoercedVariableValue(\n valueNode,\n variableValues,\n fragmentVariableValues,\n );\n if (coercedVariableValue == null && isNonNullType(type)) {\n return; // Invalid: intentionally return no value.\n }\n // Note: This does no further checking that this variable is correct.\n // This assumes validated has checked this variable is of the correct type.\n return coercedVariableValue;\n }\n\n if (isNonNullType(type)) {\n if (valueNode.kind === Kind.NULL) {\n return; // Invalid: intentionally return no value.\n }\n return coerceInputLiteral(\n valueNode,\n type.ofType,\n variableValues,\n fragmentVariableValues,\n );\n }\n\n if (valueNode.kind === Kind.NULL) {\n return null; // Explicitly return the value null.\n }\n\n if (isListType(type)) {\n if (valueNode.kind !== Kind.LIST) {\n // Lists accept a non-list value as a list of one.\n const itemValue = coerceInputLiteral(\n valueNode,\n type.ofType,\n variableValues,\n fragmentVariableValues,\n );\n if (itemValue === undefined) {\n return; // Invalid: intentionally return no value.\n }\n return [itemValue];\n }\n const coercedValue: Array<unknown> = [];\n for (const itemNode of valueNode.values) {\n let itemValue = coerceInputLiteral(\n itemNode,\n type.ofType,\n variableValues,\n fragmentVariableValues,\n );\n if (itemValue === undefined) {\n if (\n itemNode.kind === Kind.VARIABLE &&\n getCoercedVariableValue(\n itemNode,\n variableValues,\n fragmentVariableValues,\n ) == null &&\n !isNonNullType(type.ofType)\n ) {\n // A missing variable within a list is coerced to null.\n itemValue = null;\n } else {\n return; // Invalid: intentionally return no value.\n }\n }\n coercedValue.push(itemValue);\n }\n return coercedValue;\n }\n\n if (isInputObjectType(type)) {\n if (valueNode.kind !== Kind.OBJECT) {\n return; // Invalid: intentionally return no value.\n }\n\n const coercedValue: ObjMap<unknown> = Object.create(null);\n const fieldDefs = type.getFields();\n const hasUndefinedField = valueNode.fields.some(\n (field) => !Object.hasOwn(fieldDefs, field.name.value),\n );\n if (hasUndefinedField) {\n return; // Invalid: intentionally return no value.\n }\n const fieldNodes = new Map(\n valueNode.fields.map((field) => [field.name.value, field]),\n );\n for (const field of Object.values(fieldDefs)) {\n const fieldNode = fieldNodes.get(field.name);\n if (\n !fieldNode ||\n (fieldNode.value.kind === Kind.VARIABLE &&\n isMissingVariable(\n fieldNode.value,\n variableValues,\n fragmentVariableValues,\n ))\n ) {\n if (isRequiredInputField(field)) {\n return; // Invalid: intentionally return no value.\n }\n const coercedDefaultValue = coerceDefaultValue(field);\n if (coercedDefaultValue !== undefined) {\n coercedValue[field.name] = coercedDefaultValue;\n }\n } else {\n const fieldValue = coerceInputLiteral(\n fieldNode.value,\n field.type,\n variableValues,\n fragmentVariableValues,\n );\n if (fieldValue === undefined) {\n return; // Invalid: intentionally return no value.\n }\n coercedValue[field.name] = fieldValue;\n }\n }\n\n if (type.isOneOf) {\n const coercedKeys = Object.keys(coercedValue);\n if (fieldNodes.size !== 1 || coercedKeys.length !== 1) {\n return; // Invalid: not exactly one key, intentionally return no value.\n }\n\n for (const [fieldName, fieldNode] of fieldNodes) {\n if (\n fieldNode.value.kind === Kind.NULL ||\n coercedValue[fieldName] === null\n ) {\n return; // Invalid: value not non-null, intentionally return no value.\n }\n }\n }\n\n return coercedValue;\n }\n\n const leafType = assertLeafType(type);\n try {\n return leafType.coerceInputLiteral\n ? leafType.coerceInputLiteral(\n replaceVariables(valueNode, variableValues, fragmentVariableValues),\n )\n : leafType.parseLiteral(valueNode, variableValues?.coerced);\n } catch (_error) {\n // Invalid: ignore error and intentionally return no value.\n }\n}\n\n// Retrieves the variable value for the given variable node.\nfunction getCoercedVariableValue(\n variableNode: VariableNode,\n variableValues: Maybe<VariableValues>,\n fragmentVariableValues: Maybe<FragmentVariableValues>,\n): unknown {\n const varName = variableNode.name.value;\n if (fragmentVariableValues?.sources[varName] !== undefined) {\n return fragmentVariableValues.coerced[varName];\n }\n\n return variableValues?.coerced[varName];\n}\n\nfunction isMissingVariable(\n variableNode: VariableNode,\n variableValues: Maybe<VariableValues>,\n fragmentVariableValues: Maybe<FragmentVariableValues>,\n): boolean {\n const varName = variableNode.name.value;\n const scopedValues =\n fragmentVariableValues?.sources[varName] !== undefined\n ? fragmentVariableValues.coerced\n : variableValues?.coerced;\n return scopedValues?.[varName] === undefined;\n}\n\ninterface InputValue {\n type: GraphQLInputType;\n default?: GraphQLDefaultInput | undefined;\n defaultValue?: unknown;\n /** @private */\n _memoizedCoercedDefaultValue?: unknown;\n}\n\n/**\n * Returns the coerced default value for an input value definition, if it exists.\n *\n * If the default value is invalid, this will throw an error. Invalid default\n * values should be caught during validation, however, so this function assumes\n * that the default value is valid.\n * @internal\n */\nexport function coerceDefaultValue(inputValue: InputValue): unknown {\n // Memoize the result of coercing the default value in a hidden field.\n let coercedDefaultValue = inputValue._memoizedCoercedDefaultValue;\n if (coercedDefaultValue !== undefined) {\n return coercedDefaultValue;\n }\n\n const defaultInput = inputValue.default;\n if (defaultInput !== undefined) {\n coercedDefaultValue = defaultInput.literal\n ? coerceInputLiteral(defaultInput.literal, inputValue.type)\n : coerceInputValue(defaultInput.value, inputValue.type);\n invariant(\n coercedDefaultValue !== undefined,\n `Expected value of type \"${inputValue.type}\" to be valid, found: ${inspect(\n defaultInput.literal ?? defaultInput.value,\n )}.`,\n );\n inputValue._memoizedCoercedDefaultValue = coercedDefaultValue;\n return coercedDefaultValue;\n }\n\n const defaultValue = inputValue.defaultValue;\n if (defaultValue !== undefined) {\n inputValue._memoizedCoercedDefaultValue = defaultValue;\n }\n return defaultValue;\n}\n"]}