@graphql-tools/wrap
Version:
A set of utils for faster development of GraphQL tools
90 lines (89 loc) • 3.33 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const graphql_1 = require("graphql");
const utils_1 = require("@graphql-tools/utils");
class TransformQuery {
constructor({ path, queryTransformer, resultTransformer = result => result, errorPathTransformer = errorPath => [...errorPath], fragments = {}, }) {
this.path = path;
this.queryTransformer = queryTransformer;
this.resultTransformer = resultTransformer;
this.errorPathTransformer = errorPathTransformer;
this.fragments = fragments;
}
transformRequest(originalRequest, delegationContext, transformationContext) {
const pathLength = this.path.length;
let index = 0;
const document = (0, graphql_1.visit)(originalRequest.document, {
[graphql_1.Kind.FIELD]: {
enter: node => {
if (index === pathLength || node.name.value !== this.path[index]) {
return false;
}
index++;
if (index === pathLength) {
const selectionSet = this.queryTransformer(node.selectionSet, this.fragments, delegationContext, transformationContext);
return {
...node,
selectionSet,
};
}
},
leave: () => {
index--;
},
},
});
return {
...originalRequest,
document,
};
}
transformResult(originalResult, delegationContext, transformationContext) {
const data = this.transformData(originalResult.data, delegationContext, transformationContext);
const errors = originalResult.errors;
return {
data,
errors: errors != null ? this.transformErrors(errors) : undefined,
};
}
transformData(data, delegationContext, transformationContext) {
const leafIndex = this.path.length - 1;
let index = 0;
let newData = data;
if (newData) {
let next = this.path[index];
while (index < leafIndex) {
if (data[next]) {
newData = newData[next];
}
else {
break;
}
index++;
next = this.path[index];
}
newData[next] = this.resultTransformer(newData[next], delegationContext, transformationContext);
}
return data;
}
transformErrors(errors) {
return errors.map(error => {
const path = error.path;
if (path == null) {
return error;
}
let match = true;
let index = 0;
while (index < this.path.length) {
if (path[index] !== this.path[index]) {
match = false;
break;
}
index++;
}
const newPath = match ? path.slice(0, index).concat(this.errorPathTransformer(path.slice(index))) : path;
return (0, utils_1.relocatedError)(error, newPath);
});
}
}
exports.default = TransformQuery;