Function getArgumentValues

packages/utils/src/getArgumentValues.ts:24–100

(
  def: GraphQLField<any, any> | GraphQLDirective,
  node: FieldNode | DirectiveNode,
  variableValues: Record<string, any> = {},
)

 * Object prototype.
 */
export function getArgumentValues(
  def: GraphQLField<any, any> | GraphQLDirective,
  node: FieldNode | DirectiveNode,
  variableValues: Record<string, any> = {},
): Record<string, any> {
  const coercedValues = {};

  const argumentNodes = node.arguments ?? [];
  const argNodeMap: Record<string, ArgumentNode> = argumentNodes.reduce(
    (prev, arg) => ({
      ...prev,
      [arg.name.value]: arg,
    }),
    {},
  );

  for (const { name, type: argType, defaultValue } of def.args) {
    const argumentNode = argNodeMap[name];

    if (!argumentNode) {
      if (defaultValue !== undefined) {
        coercedValues[name] = defaultValue;
      } else if (isNonNullType(argType)) {
        throw createGraphQLError(
          `Argument "${name}" of required type "${inspect(argType)}" ` + 'was not provided.',
          {
            nodes: [node],
          },
        );
      }
      continue;
    }

    const valueNode = argumentNode.value;
    let isNull = valueNode.kind === Kind.NULL;

    if (valueNode.kind === Kind.VARIABLE) {
      const variableName = valueNode.name.value;
      if (variableValues == null || !hasOwnProperty(variableValues, variableName)) {
        if (defaultValue !== undefined) {
          coercedValues[name] = defaultValue;
        } else if (isNonNullType(argType)) {
          throw createGraphQLError(
            `Argument "${name}" of required type "${inspect(argType)}" ` +
              `was provided the variable "$${variableName}" which was not provided a runtime value.`,
            {
              nodes: [valueNode],
            },
          );
        }
        continue;
      }
      isNull = variableValues[variableName] == null;
    }

    if (isNull && isNonNullType(argType)) {
      throw createGraphQLError(
        `Argument "${name}" of non-null type "${inspect(argType)}" ` + 'must not be null.',