Script-getOffsetMetadata.js

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var global = newGlobal({newCompartment: true});

var dbg = Debugger(global);

dbg.onDebuggerStatement = function(frame) {

  const bps = frame.script.getPossibleBreakpoints();

  const stepBps = [];

  frame.onStep = function() {

    assertOffset(this);

};

  assertOffset(frame);

  function assertOffset(frame) {

    const meta = frame.script.getOffsetMetadata(frame.offset);

    if (meta.isBreakpoint) {

      assertEq(frame.offset, bps[0].offset);

      const expectedData = bps.shift();

      assertEq(meta.lineNumber, expectedData.lineNumber);

      assertEq(meta.columnNumber, expectedData.columnNumber);

      assertEq(meta.isStepStart, expectedData.isStepStart);

    } else {

      assertEq(meta.isStepStart, false);

};

};

global.eval(`

  function a() { return "str"; }

  debugger;

  console.log("42" + a());

  a();

  a() + a();

`);