How to use the pegjs/lib/compiler/opcodes.FAIL function in pegjs

+ "\"" + js.stringEscape(node.value) + "\", "
            + node.ignoreCase
            + ")"
        );

        // For case-sensitive strings the value must match the beginning of the
        // remaining input exactly. As a result, we can use |ACCEPT_STRING| and
        // save one |substr| call that would be needed if we used |ACCEPT_N|.
        return buildCondition(
          node.ignoreCase
            ? [op.MATCH_STRING_IC, stringIndex]
            : [op.MATCH_STRING, stringIndex],
          node.ignoreCase
            ? [op.ACCEPT_N, node.value.length]
            : [op.ACCEPT_STRING, stringIndex],
          [op.FAIL, expectedIndex]
        );
      } else {
        let stringIndex = addConst("\"\"");

        return [op.PUSH, stringIndex];
      }
    },

"peg$currPos++;"
            );
            ip += 2;
            break;

          case op.ACCEPT_STRING: // ACCEPT_STRING s
            parts.push(stack.push(c(bc[ip + 1])));
            parts.push(
              eval(ast.consts[bc[ip + 1]]).length > 1 ?
              "peg$currPos += " + eval(ast.consts[bc[ip + 1]]).length + ";" :
              "peg$currPos++;"
            );
            ip += 2;
            break;

          case op.FAIL: // FAIL e
            parts.push(stack.push("peg$FAILED"));
            parts.push("if (peg$silentFails === 0) { peg$fail(" + c(bc[ip + 1]) + "); }");
            ip += 2;
            break;

          case op.LOAD_SAVED_POS: // LOAD_SAVED_POS p
            parts.push("peg$savedPos = " + stack.index(bc[ip + 1]) + ";");
            ip += 2;
            break;

          case op.UPDATE_SAVED_POS: // UPDATE_SAVED_POS
            parts.push("peg$savedPos = peg$currPos;");
            ip++;
            break;

          case op.CALL: // CALL f, n, pc, p1, p2, ..., pN

1
      )),
      "",
      "        case " + op.ACCEPT_N + ":", // ACCEPT_N n
      "          stack.push(input.substr(peg$currPos, bc[ip + 1]));",
      "          peg$currPos += bc[ip + 1];",
      "          ip += 2;",
      "          break;",
      "",
      "        case " + op.ACCEPT_STRING + ":", // ACCEPT_STRING s
      "          stack.push(peg$consts[bc[ip + 1]]);",
      "          peg$currPos += (peg$consts[bc[ip + 1]] as string).length;",
      "          ip += 2;",
      "          break;",
      "",
      "        case " + op.FAIL + ":", // FAIL e
      "          stack.push(peg$FAILED);",
      "          if (peg$silentFails === 0) {",
      "            peg$fail(peg$consts[bc[ip + 1]] as ILiteralExpectation);",
      "          }",
      "          ip += 2;",
      "          break;",
      "",
      "        case " + op.LOAD_SAVED_POS + ":", // LOAD_SAVED_POS p
      "          peg$savedPos = stack[stack.length - 1 - bc[ip + 1]];",
      "          ip += 2;",
      "          break;",
      "",
      "        case " + op.UPDATE_SAVED_POS + ":", // UPDATE_SAVED_POS
      "          peg$savedPos = peg$currPos;",
      "          ip++;",
      "          break;",