locale-checker.js

const { spawn, execSync } = require("child_process");

const localeKeys = execSync(
  "grep -Eo '^([A-z0-9.]+)' devtools/client/locales/en-US/debugger.properties"
)
  .toString()
  .split("\n")
  .filter(Boolean);

const unusedKeys = localeKeys.filter(key => {
  const results = execSync(
    `grep -ro '${key}' devtools/client/debugger/src/ | wc -l | xargs`
  )
    .toString()
    .split("\n");

  //console.log(`results for ${key} is: ${results}`);
  return Number(results.toString().replace(",", "")) == 0;
});

console.log("-------------------------");
console.log("Unused keys: \n", unusedKeys.join("\n"));