small yargs cli for json-literal-typer using ts-node

json-literal-typer.ts

#!/usr/bin/env ts-node
import * as yargs from 'yargs';
import { default as analyze, typify } from 'json-literal-typer';
import * as fs from 'fs';

const argv = yargs
  .option('output', {
    alias: 'o',
    description: 'output file',
    type: 'string',
    required: true,
  })
  .option('input', {
    alias: 'i',
    description: 'input file',
    type: 'string',
    required: true,
  })
  .option('typename', {
    alias: 't',
    description: 'name of the root type to export',
    type: 'string',
    required: false,
  })
  .help().argv;

try {
  const file = fs.readFileSync(argv.input).toString('utf8');
  const jsonified = JSON.parse(file);
  const analyzed = analyze(jsonified);
  const result = typify(analyzed);
  const typename = argv.typename ?? 'Root';
  const exportResult = result.replace(
    'interface Root {',
    `export interface ${typename} {`,
  );
  fs.writeFileSync(argv.output, exportResult);
} catch (error) {
  throw new Error(error);
}