@graphql-tools/utils
Version:
Common package containing utils and types for GraphQL tools
109 lines (108 loc) • 4.19 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.astFromValue = astFromValue;
const cross_inspect_1 = require("cross-inspect");
const graphql_1 = require("graphql");
const astFromValueUntyped_js_1 = require("./astFromValueUntyped.js");
const jsutils_js_1 = require("./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 |
*
*/
function astFromValue(value, type) {
if ((0, graphql_1.isNonNullType)(type)) {
const astValue = astFromValue(value, type.ofType);
if (astValue?.kind === graphql_1.Kind.NULL) {
return null;
}
return astValue;
}
// only explicit null, not undefined, NaN
if (value === null) {
return { kind: graphql_1.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 ((0, graphql_1.isListType)(type)) {
const itemType = type.ofType;
if ((0, jsutils_js_1.isIterableObject)(value)) {
const valuesNodes = [];
for (const item of value) {
const itemNode = astFromValue(item, itemType);
if (itemNode != null) {
valuesNodes.push(itemNode);
}
}
return { kind: graphql_1.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 ((0, graphql_1.isInputObjectType)(type)) {
if (!(0, jsutils_js_1.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: graphql_1.Kind.OBJECT_FIELD,
name: { kind: graphql_1.Kind.NAME, value: field.name },
value: fieldValue,
});
}
}
return { kind: graphql_1.Kind.OBJECT, fields: fieldNodes };
}
if ((0, graphql_1.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 ((0, graphql_1.isEnumType)(type)) {
return { kind: graphql_1.Kind.ENUM, value: serialized };
}
// ID types can use Int literals.
if (type.name === 'ID' &&
typeof serialized === 'string' &&
integerStringRegExp.test(serialized)) {
return { kind: graphql_1.Kind.INT, value: serialized };
}
return (0, astFromValueUntyped_js_1.astFromValueUntyped)(serialized);
}
/* c8 ignore next 3 */
// Not reachable, all possible types have been considered.
console.assert(false, 'Unexpected input type: ' + (0, cross_inspect_1.inspect)(type));
}
/**
* IntValue:
* - NegativeSign? 0
* - NegativeSign? NonZeroDigit ( Digit+ )?
*/
const integerStringRegExp = /^-?(?:0|[1-9][0-9]*)$/;