How to use the jest-matchers.getState function in jest-matchers

function compareSnapshot(expect, flags, subjectAdapter, subjectRenderer, subjectOutput) {

  const state = matchers.getState();

  if (!state.unexpectedSnapshot) {
    state.unexpectedSnapshot = new UnexpectedSnapshotState(state.snapshotState);
  }

  const snapshot = state.unexpectedSnapshot.getSnapshot(state.testPath, state.currentTestName, expect);
  if (snapshot === null) {
    // Write and save
    state.unexpectedSnapshot.saveSnapshot(state.testPath, state.currentTestName, rawAdapter.serialize(subjectAdapter, subjectOutput), expect);
    state.snapshotState.added++;
  } else {
    expect.withError(() => {
      if (flags.satisfy) {
        expect(subjectRenderer, 'to have rendered', rawAdapter.deserialize(snapshot));
      } else {
        expect(subjectRenderer, 'to have rendered with all children with all wrappers with all classes with all attributes', rawAdapter.deserialize(snapshot));

snapshotState.removeUncheckedKeys = function () {
      const state = matchers.getState();
      let isDirty = false;
      const snapshot = state.unexpectedSnapshot && state.unexpectedSnapshot._files[state.testPath];
      if (snapshot && snapshot.uncheckedKeys.size) {
        snapshot.uncheckedKeys.forEach(key => {
          const testName = /(.*)\s[0-9]+$/.exec(key)[1];

          if (!snapshot.failedTests.has(testName)) {
            isDirty = true;
            delete snapshot.allTests[key]
          }
        });
      }

      if (!snapshot || Object.keys(snapshot.allTests).length === 0) {
        const snapshotPath = getSnapshotPath(state.testPath);
        try {

function injectStateHooks() {
  const state = matchers.getState();
  const snapshotState = state && state.snapshotState;
  if (snapshotState) {
    const originalRemoveUncheckedKeys = snapshotState.removeUncheckedKeys;

    snapshotState.removeUncheckedKeys = function () {
      const state = matchers.getState();
      let isDirty = false;
      const snapshot = state.unexpectedSnapshot && state.unexpectedSnapshot._files[state.testPath];
      if (snapshot && snapshot.uncheckedKeys.size) {
        snapshot.uncheckedKeys.forEach(key => {
          const testName = /(.*)\s[0-9]+$/.exec(key)[1];

          if (!snapshot.failedTests.has(testName)) {
            isDirty = true;
            delete snapshot.allTests[key]
          }