3 files changed, 7 insertions, 8 deletions
diff --git a/src/liolib.js b/src/liolib.js
index 6a5e895..bd78f87 100644
--- a/src/liolib.js
+++ b/src/liolib.js
@@ -1,6 +1,5 @@
 "use strict";
 
-const assert  = require('assert');
 const fs      = require('fs');
 
 const {
@@ -32,6 +31,7 @@ const {
     luaL_setmetatable,
     luaL_testudata
 } = require('./lauxlib.js');
+const lualib = require('./lualib.js');
 const { to_luastring } = require("./fengaricore.js");
 
 const IO_PREFIX = "_IO_";
@@ -72,7 +72,7 @@ const tofile = function(L) {
     let p = tolstream(L);
     if (isclosed(p))
         luaL_error(L, to_luastring("attempt to use a closed file"));
-    assert(p.f);
+    lualib.lua_assert(p.f);
     return p.f;
 };
 
diff --git a/src/lstrlib.js b/src/lstrlib.js
index 5477750..33076ef 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -1,11 +1,11 @@
 "use strict";
 
-const assert  = require('assert');
 const sprintf = require('sprintf-js').sprintf;
 
 const lauxlib = require('./lauxlib.js');
 const lua     = require('./lua.js');
 const luaconf = require('./luaconf.js');
+const lualib = require('./lualib.js');
 const {luastring_indexOf, to_jsstring, to_luastring} = require("./fengaricore.js");
 
 const sL_ESC  = '%';
@@ -724,7 +724,7 @@ const unpackint = function(L, str, islittle, size, issigned) {
 };
 
 const unpacknum = function(L, b, islittle, size) {
-    assert(b.length >= size);
+    lualib.lua_assert(b.length >= size);
 
     let dv = new DataView(new ArrayBuffer(size));
     for (let i = 0; i < size; i++)
@@ -1148,7 +1148,7 @@ const prepstate = function(ms, L, s, ls, p, lp) {
 
 const reprepstate = function(ms) {
     ms.level = 0;
-    assert(ms.matchdepth === MAXCCALLS);
+    lualib.lua_assert(ms.matchdepth === MAXCCALLS);
 };
 
 const find_subarray = function(arr, subarr, from_index) {
diff --git a/src/ltablib.js b/src/ltablib.js
index a24a275..6d3eeb2 100644
--- a/src/ltablib.js
+++ b/src/ltablib.js
@@ -1,10 +1,9 @@
 "use strict";
 
-const assert  = require('assert');
-
 const lua     = require('./lua.js');
 const lauxlib = require('./lauxlib.js');
 const luaconf = require('./luaconf.js');
+const lualib = require('./lualib.js');
 const {to_luastring} = require("./fengaricore.js");
 
 /*
@@ -234,7 +233,7 @@ const partition = function(L, lo, up) {
 const choosePivot = function(lo, up, rnd) {
     let r4 = Math.floor((up - lo) / 4);  /* range/4 */
     let p = rnd % (r4 * 2) + (lo + r4);
-    assert(lo + r4 <= p && p <= up - r4);
+    lualib.lua_assert(lo + r4 <= p && p <= up - r4);
     return p;
 };