52 lines
1.7 KiB
TypeScript
52 lines
1.7 KiB
TypeScript
import type { GraphQLSchema, IntrospectionQuery } from "graphql";
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import { buildClientSchema, buildSchema, introspectionFromSchema } from "graphql";
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// Accepts either a GraphQL introspection JSON ({ data: { __schema } } or
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// { __schema }) or an SDL string and normalizes both into the wrapped
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// { data: <introspection> } JSON shape used by the introspection store.
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export function tryBuildIntrospectionFromFile(
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fileContent: string,
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): { schema: GraphQLSchema; content: string } | { error: string } {
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let parsedJson: unknown;
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try {
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parsedJson = JSON.parse(fileContent);
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} catch {
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parsedJson = undefined;
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}
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if (parsedJson != null && typeof parsedJson === "object") {
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const candidates: unknown[] = [(parsedJson as { data?: unknown }).data, parsedJson];
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for (const candidate of candidates) {
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if (
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candidate != null &&
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typeof candidate === "object" &&
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"__schema" in (candidate as Record<string, unknown>)
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) {
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try {
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const schema = buildClientSchema(candidate as IntrospectionQuery, {});
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return { schema, content: JSON.stringify({ data: candidate }) };
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} catch (e) {
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return {
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error: `Failed to build schema from introspection JSON: ${errorMessage(e)}`,
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};
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}
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}
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}
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}
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try {
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const schema = buildSchema(fileContent);
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const introspection = introspectionFromSchema(schema);
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return { schema, content: JSON.stringify({ data: introspection }) };
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} catch (e) {
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return {
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error: `Could not parse file as introspection JSON or GraphQL SDL: ${errorMessage(e)}`,
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};
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}
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}
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function errorMessage(e: unknown): string {
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return e instanceof Error ? e.message : String(e);
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}
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