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wiki/server/graph/scalars/json.js

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const { Kind, GraphQLScalarType } = require('graphql')
function ensureObject (value) {
if (typeof value !== 'object' || value === null || Array.isArray(value)) {
throw new TypeError(`JSONObject cannot represent non-object value: ${value}`)
}
return value
}
function parseLiteral (typeName, ast, variables) {
switch (ast.kind) {
case Kind.STRING:
case Kind.BOOLEAN:
return ast.value
case Kind.INT:
case Kind.FLOAT:
return parseFloat(ast.value)
case Kind.OBJECT:
return parseObject(typeName, ast, variables)
case Kind.LIST:
return ast.values.map((n) => parseLiteral(typeName, n, variables))
case Kind.NULL:
return null
case Kind.VARIABLE:
return variables ? variables[ast.name.value] : undefined
default:
throw new TypeError(`${typeName} cannot represent value: ${ast}`)
}
}
function parseObject (typeName, ast, variables) {
const value = Object.create(null)
ast.fields.forEach((field) => {
// eslint-disable-next-line no-use-before-define
value[field.name.value] = parseLiteral(typeName, field.value, variables)
})
return value
}
module.exports = new GraphQLScalarType({
name: 'JSON',
description:
'The `JSON` scalar type represents JSON objects as specified by [ECMA-404](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf).',
specifiedByUrl:
'http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf',
serialize: ensureObject,
parseValue: ensureObject,
parseLiteral: (ast, variables) => {
if (ast.kind !== Kind.OBJECT) {
throw new TypeError(`JSONObject cannot represent non-object value: ${ast}`)
}
return parseObject('JSONObject', ast, variables)
}
})