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import { parse, print } from "graphql";
//
// 1. Parse the GraphQL tag.
// 2. From the parsed GraphQL query, get the AST definition.
// 3. From the AST definition, inject an import to that file inside the artifact directory
// 4. MD5 the printed source text
// 5. At runtime, if md5 !== import.md5, then warn the user that the query has changed
// but the file hasn't been updated so it must be reloaded.
// 6. Replace the TemplateLiteral with the default identifier from the injected import
let artifactDirectory: string =
process?.env?.BUN_MACRO_RELAY_ARTIFACT_DIRECTORY ??
process?.env?.RELAY_ARTIFACT_DIRECTORY ??
`__generated__`;
artifactDirectory = artifactDirectory.startsWith("/")
? artifactDirectory
: Bun.cwd + artifactDirectory;
export function graphql(node) {
let query;
if (node instanceof <call />) {
query = node.arguments[0].toString();
} else if (node instanceof <template />) {
query = node.toString();
}
if (typeof query !== "string" || query.length === 0) {
throw new Error("BunMacroRelay: Unexpected empty graphql string.");
}
const ast = parse(query);
if (ast.definitions.length === 0) {
throw new Error("BunMacroRelay: Unexpected empty graphql tag.");
}
const definition = ast.definitions[0];
if (
definition.kind !== "FragmentDefinition" &&
definition.kind !== "OperationDefinition"
) {
throw new Error(
`BunMacroRelay: Expected a fragment, mutation, query, or subscription, got "${definition.kind}"`
);
}
const graphqlDefinition = definition;
const definitionName = graphqlDefinition.name && graphqlDefinition.name.value;
if (!definitionName) {
throw new Error("GraphQL operations and fragments must contain names");
}
const importStmt = (
<import
default={definitionName}
path={`${artifactDirectory}/${definitionName}`}
/>
);
try {
const ret = (
<>
<inject>{importStmt}</inject>
<id to={importStmt.namespace[definitionName]} pure />
</>
);
return ret;
} catch (exception) {
console.error(exception);
}
return null;
}
|
