flowtype/sort-keys throws TypeError when handling interface types with method signatures with return types

[sompylasar]

interface IFoo {
  b(): void;
  a(): void;
}

TypeError: Cannot read property 'range' of null
Occurred while linting <text>:2
    at properties.map.property (/sandbox/node_modules/eslint-plugin-flowtype/dist/rules/sortKeys.js:68:63)
    at Array.map (<anonymous>)
    at generateOrderedList (/sandbox/node_modules/eslint-plugin-flowtype/dist/rules/sortKeys.js:42:28)
    at generateFix (/sandbox/node_modules/eslint-plugin-flowtype/dist/rules/sortKeys.js:128:20)
    at Object.fix (/sandbox/node_modules/eslint-plugin-flowtype/dist/rules/sortKeys.js:181:30)
    at normalizeFixes (/sandbox/node_modules/eslint/lib/linter/report-translator.js:178:28)
    at args (/sandbox/node_modules/eslint/lib/linter/report-translator.js:347:49)
    at Object.report (/sandbox/node_modules/eslint/lib/linter/linter.js:920:41)
    at _lodash.default.forEach.identifierNode (/sandbox/node_modules/eslint-plugin-flowtype/dist/rules/sortKeys.js:173:17)
    at arrayEach (/sandbox/node_modules/lodash/lodash.js:516:11)

Minimal repro on CodeSandbox Node.js: https://codesandbox.io/s/compassionate-hooks-3zp3w?file=/src/index.js:530-590

// CodeSandbox Node.js
// dependencies: eslint, babel-eslint, eslint-plugin-flowtype
const { ESLint } = require("eslint");
const http = require("http");

http
  .createServer(function (req, res) {
    (async function main() {
      const eslint = new ESLint({
        baseConfig: {
          parser: "babel-eslint",
          plugins: ["eslint-plugin-flowtype"],
          rules: {
            "flowtype/sort-keys": "error"
          }
        },
        useEslintrc: false
      });
      const results = await eslint.lintText(`
interface IFoo {
  b(): void;
  a(): void;
}
`);
      const formatter = await eslint.loadFormatter("compact");
      const resultText = formatter.format(results);
      res.write("Lint Success: " + resultText);
      res.end();
    })().catch((error) => {
      res.write("Lint Error: " + (error.stack || String(error)));
      res.end();
    });
  })
  .listen(8080);

[gajus]

🎉 This issue has been resolved in version 5.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀