Line data    Source code

       1              : import { stringifyError } from '../../platform/logger/logger.js';
       2              : import { loadVega } from './vegalite_loader.js';
       3              : import { withViewEncodings } from './vegalite_spec.js';
       4              : 
       5              : /// The logger that Vega-Lite reports problems to
       6              : type VegaLiteLogger = NonNullable<NonNullable<Parameters<typeof import('vega-lite').compile>[1]>['logger']>;
       7              : 
       8              : /// The problems of a Vega-Lite spec: the errors and warnings of compiling it without data
       9            1 : export async function checkVegaLiteSpec(spec: Record<string, unknown>): Promise<string[]> {
      10            1 :     const { vegaLite } = await loadVega();
      11            1 :     const problems: string[] = [];
      12            1 :     const collect = (...message: unknown[]) => {
      13            1 :         problems.push(message.map(m => (typeof m === 'string' ? m : stringifyError(m))).join(' '));
      14            1 :         return logger;
      15            1 :     };
      16            1 :     const logger: VegaLiteLogger = { level: () => logger, error: collect, warn: collect, info: () => logger, debug: () => logger };
      17            1 :     try {
      18            1 :         vegaLite.compile({ ...withViewEncodings(spec), data: { values: [] } } as Parameters<typeof vegaLite.compile>[0], { logger });
      19            1 :     } catch (e: unknown) {
      20            1 :         problems.push(stringifyError(e));
      21            1 :     }
      22            1 :     return problems;
      23            1 : }