INNER CODE UNIT · TypeScript

canDisplayGraphiQL

graphql-community/koa-graphql · src/index.ts:443

function canDisplayGraphiQL(request: Request, params: GraphQLParams): boolean {
  // If `raw` false, GraphiQL mode is not enabled.
  // Allowed to show GraphiQL if not requested as raw and this request prefers HTML over JSON.
  return !params.raw && request.accepts(['json', 'html']) === 'html';
}

function devAssertIsObject(value: unknown, message: string): void {
  devAssert(value != null && typeof value === 'object', message);
}

function devAssertIsNonNullable(value: unknown, message: string): void {
  devAssert(value != null, message);
}

function devAssert(condition: unknown, message: string): void {
  const booleanCondition = Boolean(condition);
  if (!booleanCondition) {
    throw new TypeError(message);

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