generate.js

'use strict';

const fs = require('fs');

const n = 1000;
const m = 100;

for (let i = 0; i < n; i++) {
  const contents = `
  /* @flow */

  ${
    Array(m).fill().map(
      (_, i) =>
      `
      type T${i} = {
        foo: number,
        bar: string,
      };

      export function testT${i}(v: T${i}) {
      }

      import { testT${i} as testT${i}_ } from './${Math.random() * n >>> 0}'

      testT${i}_({ foo: 1, bar: '2' });
      `
    ).join('\n')
  }
  `

  fs.writeFileSync(`./src/f/${i}.ts`, contents);
}