create-merged-schema.ts

#!/usr/bin/env ts-node
/*
 * Create a complete JSON schema for tsconfig.json
 * by merging the schemastore schema with our ts-node additions.
 * This merged schema can be submitted in a pull request to
 * SchemaStore.
 */

import axios from 'axios';
import { resolve } from 'path';
import { writeFileSync } from 'fs';

async function main() {
  /** schemastore definition */
  const schemastoreSchema = await getSchemastoreSchema();

  /** ts-node schema auto-generated from ts-node source code */
  const originalTsNodeSchema = require('../tsconfig.schema.json');
  // Apply this prefix to the names of all ts-node-generated definitions
  const tsnodeDefinitionPrefix = 'tsNode';
  let tsNodeSchema: any = JSON.parse(
    JSON.stringify(originalTsNodeSchema).replace(/#\/definitions\//g, `#/definitions/${tsnodeDefinitionPrefix}`)
  );
  tsNodeSchema.definitions = Object.fromEntries(
    Object.entries(tsNodeSchema.definitions).map(([key, value]) => [`${tsnodeDefinitionPrefix}${key}`, value])
  );
  // console.dir(tsNodeSchema, {
  //   depth: Infinity
  // });

  /** Patch ts-node stuff into the schemastore definition. */
  const mergedSchema = {
    ...schemastoreSchema,
    definitions: {
      ...Object.fromEntries(
        Object.entries(schemastoreSchema.definitions).filter(([key]) => !key.startsWith(tsnodeDefinitionPrefix))
      ),
      ...tsNodeSchema.definitions,
      tsNodeTsConfigOptions: undefined,
      tsNodeTsConfigSchema: undefined,
      tsNodeDefinition: {
        properties: {
          'ts-node': {
            ...tsNodeSchema.definitions.tsNodeTsConfigOptions,
            description: tsNodeSchema.definitions.tsNodeTsConfigSchema.properties['ts-node'].description,
            properties: {
              ...tsNodeSchema.definitions.tsNodeTsConfigOptions.properties,
              compilerOptions: {
                ...tsNodeSchema.definitions.tsNodeTsConfigOptions.properties.compilerOptions,
                allOf: [
                  {
                    $ref: '#/definitions/compilerOptionsDefinition/properties/compilerOptions',
                  },
                ],
              },
            },
          },
        },
      },
    },
  };
  // Splice into the allOf array at a spot that looks good.  Does not affect
  // behavior of the schema, but looks nicer if we want to submit as a PR to schemastore.
  mergedSchema.allOf = mergedSchema.allOf.filter((item: any) => !item.$ref?.includes('tsNode'));
  mergedSchema.allOf.splice(mergedSchema.allOf.length - 1, 0, {
    $ref: '#/definitions/tsNodeDefinition',
  });

  writeFileSync(resolve(__dirname, '../tsconfig.schemastore-schema.json'), JSON.stringify(mergedSchema, null, 2));
}

export async function getSchemastoreSchema() {
  const { data: schemastoreSchema } = await axios.get(
    'https://schemastore.azurewebsites.net/schemas/json/tsconfig.json',
    { responseType: 'json' }
  );
  return schemastoreSchema;
}

main();