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diff --git a/node_modules/markdown-it/lib/rules_inline/balance_pairs.js b/node_modules/markdown-it/lib/rules_inline/balance_pairs.js
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+// For each opening emphasis-like marker find a matching closing one
+//
+'use strict';
+
+
+function processDelimiters(state, delimiters) {
+  var closerIdx, openerIdx, closer, opener, minOpenerIdx, newMinOpenerIdx,
+      isOddMatch, lastJump,
+      openersBottom = {},
+      max = delimiters.length;
+
+  if (!max) return;
+
+  // headerIdx is the first delimiter of the current (where closer is) delimiter run
+  var headerIdx = 0;
+  var lastTokenIdx = -2; // needs any value lower than -1
+  var jumps = [];
+
+  for (closerIdx = 0; closerIdx < max; closerIdx++) {
+    closer = delimiters[closerIdx];
+
+    jumps.push(0);
+
+    // markers belong to same delimiter run if:
+    //  - they have adjacent tokens
+    //  - AND markers are the same
+    //
+    if (delimiters[headerIdx].marker !== closer.marker || lastTokenIdx !== closer.token - 1) {
+      headerIdx = closerIdx;
+    }
+
+    lastTokenIdx = closer.token;
+
+    // Length is only used for emphasis-specific "rule of 3",
+    // if it's not defined (in strikethrough or 3rd party plugins),
+    // we can default it to 0 to disable those checks.
+    //
+    closer.length = closer.length || 0;
+
+    if (!closer.close) continue;
+
+    // Previously calculated lower bounds (previous fails)
+    // for each marker, each delimiter length modulo 3,
+    // and for whether this closer can be an opener;
+    // https://github.com/commonmark/cmark/commit/34250e12ccebdc6372b8b49c44fab57c72443460
+    if (!openersBottom.hasOwnProperty(closer.marker)) {
+      openersBottom[closer.marker] = [ -1, -1, -1, -1, -1, -1 ];
+    }
+
+    minOpenerIdx = openersBottom[closer.marker][(closer.open ? 3 : 0) + (closer.length % 3)];
+
+    openerIdx = headerIdx - jumps[headerIdx] - 1;
+
+    newMinOpenerIdx = openerIdx;
+
+    for (; openerIdx > minOpenerIdx; openerIdx -= jumps[openerIdx] + 1) {
+      opener = delimiters[openerIdx];
+
+      if (opener.marker !== closer.marker) continue;
+
+      if (opener.open && opener.end < 0) {
+
+        isOddMatch = false;
+
+        // from spec:
+        //
+        // If one of the delimiters can both open and close emphasis, then the
+        // sum of the lengths of the delimiter runs containing the opening and
+        // closing delimiters must not be a multiple of 3 unless both lengths
+        // are multiples of 3.
+        //
+        if (opener.close || closer.open) {
+          if ((opener.length + closer.length) % 3 === 0) {
+            if (opener.length % 3 !== 0 || closer.length % 3 !== 0) {
+              isOddMatch = true;
+            }
+          }
+        }
+
+        if (!isOddMatch) {
+          // If previous delimiter cannot be an opener, we can safely skip
+          // the entire sequence in future checks. This is required to make
+          // sure algorithm has linear complexity (see *_*_*_*_*_... case).
+          //
+          lastJump = openerIdx > 0 && !delimiters[openerIdx - 1].open ?
+            jumps[openerIdx - 1] + 1 :
+            0;
+
+          jumps[closerIdx] = closerIdx - openerIdx + lastJump;
+          jumps[openerIdx] = lastJump;
+
+          closer.open  = false;
+          opener.end   = closerIdx;
+          opener.close = false;
+          newMinOpenerIdx = -1;
+          // treat next token as start of run,
+          // it optimizes skips in **<...>**a**<...>** pathological case
+          lastTokenIdx = -2;
+          break;
+        }
+      }
+    }
+
+    if (newMinOpenerIdx !== -1) {
+      // If match for this delimiter run failed, we want to set lower bound for
+      // future lookups. This is required to make sure algorithm has linear
+      // complexity.
+      //
+      // See details here:
+      // https://github.com/commonmark/cmark/issues/178#issuecomment-270417442
+      //
+      openersBottom[closer.marker][(closer.open ? 3 : 0) + ((closer.length || 0) % 3)] = newMinOpenerIdx;
+    }
+  }
+}
+
+
+module.exports = function link_pairs(state) {
+  var curr,
+      tokens_meta = state.tokens_meta,
+      max = state.tokens_meta.length;
+
+  processDelimiters(state, state.delimiters);
+
+  for (curr = 0; curr < max; curr++) {
+    if (tokens_meta[curr] && tokens_meta[curr].delimiters) {
+      processDelimiters(state, tokens_meta[curr].delimiters);
+    }
+  }
+};