/
valueFromASTUntyped.js
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/
valueFromASTUntyped.js
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// @flow strict
import inspect from '../jsutils/inspect';
import invariant from '../jsutils/invariant';
import keyValMap from '../jsutils/keyValMap';
import isInvalid from '../jsutils/isInvalid';
import { type ObjMap } from '../jsutils/ObjMap';
import { Kind } from '../language/kinds';
import { type ValueNode } from '../language/ast';
/**
* Produces a JavaScript value given a GraphQL Value AST.
*
* Unlike `valueFromAST()`, no type is provided. The resulting JavaScript value
* will reflect the provided GraphQL value AST.
*
* | GraphQL Value | JavaScript Value |
* | -------------------- | ---------------- |
* | Input Object | Object |
* | List | Array |
* | Boolean | Boolean |
* | String / Enum | String |
* | Int / Float | Number |
* | Null | null |
*
*/
export function valueFromASTUntyped(
valueNode: ValueNode,
variables?: ?ObjMap<mixed>,
): mixed {
switch (valueNode.kind) {
case Kind.NULL:
return null;
case Kind.INT:
return parseInt(valueNode.value, 10);
case Kind.FLOAT:
return parseFloat(valueNode.value);
case Kind.STRING:
case Kind.ENUM:
case Kind.BOOLEAN:
return valueNode.value;
case Kind.LIST:
return valueNode.values.map(node => valueFromASTUntyped(node, variables));
case Kind.OBJECT:
return keyValMap(
valueNode.fields,
field => field.name.value,
field => valueFromASTUntyped(field.value, variables),
);
case Kind.VARIABLE: {
const variableName = valueNode.name.value;
return variables && !isInvalid(variables[variableName])
? variables[variableName]
: undefined;
}
}
// Not reachable. All possible value nodes have been considered.
invariant(false, 'Unexpected value node: ' + inspect((valueNode: empty)));
}