flow-bro/get-flow-file-coverage.js

Your personal flow type helper with features like coverage and watch mode

const execFile = require("child_process").execFile;
const toPromise = require("./to-promise");

module.exports = function getFlowCoverage(filePath) {
  const startValue = "Covered:";
  const endValue = "% (";

  return toPromise(execFile, "./node_modules/.bin/flow", [
    "coverage",
    filePath,
    "--json"
  ])
    .then(result => JSON.parse(result))
    .then(({ expressions }) => ({
      file: filePath,
      covered: expressions.covered_count,
      all: expressions.covered_count + expressions.uncovered_count,
      result:
        expressions.covered_count /
        (expressions.covered_count + expressions.uncovered_count) *
        100
    }));
};