no-unsafe-finally

禁止 finally 块中的控制流语句

Disallow control flow statements in finally blocks

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// We expect this function to return 1;
(() => {
    try {
        return 1; // 1 is returned but suspended until finally block ends
    } catch(err) {
        return 2;
    } finally {
        return 3; // 3 is returned before 1, which we did not expect
    }
})();

// > 3

// We expect this function to throw an error, then return
(() => {
    try {
        throw new Error("Try"); // error is thrown but suspended until finally block ends
    } finally {
        return 3; // 3 is returned before the error is thrown, which we did not expect
    }
})();

// > 3

// We expect this function to throw Try(...) error from the catch block
(() => {
    try {
        throw new Error("Try")
    } catch(err) {
        throw err; // The error thrown from try block is caught and rethrown
    } finally {
        throw new Error("Finally"); // Finally(...) is thrown, which we did not expect
    }
})();

// > Uncaught Error: Finally(...)

// We expect this function to return 0 from try block.
(() => {
  label: try {
    return 0; // 0 is returned but suspended until finally block ends
  } finally {
    break label; // It breaks out the try-finally block, before 0 is returned.
  }
  return 1;
})();

// > 1