@graphql-tools/utils/esm/astFromValue.js

Common package containing utils and types for GraphQL tools

import { inspect } from 'cross-inspect';
import { isEnumType, isInputObjectType, isLeafType, isListType, isNonNullType, Kind, } from 'graphql';
import { astFromValueUntyped } from './astFromValueUntyped.js';
import { isIterableObject, isObjectLike } from './jsutils.js';
/**
 * Produces a GraphQL Value AST given a JavaScript object.
 * Function will match JavaScript/JSON values to GraphQL AST schema format
 * by using suggested GraphQLInputType. For example:
 *
 *     astFromValue("value", GraphQLString)
 *
 * A GraphQL type must be provided, which will be used to interpret different
 * JavaScript values.
 *
 * | JSON Value    | GraphQL Value        |
 * | ------------- | -------------------- |
 * | Object        | Input Object         |
 * | Array         | List                 |
 * | Boolean       | Boolean              |
 * | String        | String / Enum Value  |
 * | Number        | Int / Float          |
 * | BigInt        | Int                  |
 * | Unknown       | Enum Value           |
 * | null          | NullValue            |
 *
 */
export function astFromValue(value, type) {
    if (isNonNullType(type)) {
        const astValue = astFromValue(value, type.ofType);
        if (astValue?.kind === Kind.NULL) {
            return null;
        }
        return astValue;
    }
    // only explicit null, not undefined, NaN
    if (value === null) {
        return { kind: Kind.NULL };
    }
    // undefined
    if (value === undefined) {
        return null;
    }
    // Convert JavaScript array to GraphQL list. If the GraphQLType is a list, but
    // the value is not an array, convert the value using the list's item type.
    if (isListType(type)) {
        const itemType = type.ofType;
        if (isIterableObject(value)) {
            const valuesNodes = [];
            for (const item of value) {
                const itemNode = astFromValue(item, itemType);
                if (itemNode != null) {
                    valuesNodes.push(itemNode);
                }
            }
            return { kind: Kind.LIST, values: valuesNodes };
        }
        return astFromValue(value, itemType);
    }
    // Populate the fields of the input object by creating ASTs from each value
    // in the JavaScript object according to the fields in the input type.
    if (isInputObjectType(type)) {
        if (!isObjectLike(value)) {
            return null;
        }
        const fieldNodes = [];
        for (const field of Object.values(type.getFields())) {
            const fieldValue = astFromValue(value[field.name], field.type);
            if (fieldValue) {
                fieldNodes.push({
                    kind: Kind.OBJECT_FIELD,
                    name: { kind: Kind.NAME, value: field.name },
                    value: fieldValue,
                });
            }
        }
        return { kind: Kind.OBJECT, fields: fieldNodes };
    }
    if (isLeafType(type)) {
        // Since value is an internally represented value, it must be serialized
        // to an externally represented value before converting into an AST.
        const serialized = type.serialize(value);
        if (serialized == null) {
            return null;
        }
        if (isEnumType(type)) {
            return { kind: Kind.ENUM, value: serialized };
        }
        // ID types can use Int literals.
        if (type.name === 'ID' &&
            typeof serialized === 'string' &&
            integerStringRegExp.test(serialized)) {
            return { kind: Kind.INT, value: serialized };
        }
        return astFromValueUntyped(serialized);
    }
    /* c8 ignore next 3 */
    // Not reachable, all possible types have been considered.
    console.assert(false, 'Unexpected input type: ' + inspect(type));
}
/**
 * IntValue:
 *   - NegativeSign? 0
 *   - NegativeSign? NonZeroDigit ( Digit+ )?
 */
const integerStringRegExp = /^-?(?:0|[1-9][0-9]*)$/;