diff --git a/src/consts.rs b/src/consts.rs
new file mode 100644
index 0000000..c695270
--- /dev/null
+++ b/src/consts.rs
@@ -0,0 +1,104 @@
+#[allow(unused)] // reason: Will be used later
+pub const RESERVED_WORDS: [&str; 35] = [
+    "break",
+    "case",
+    "catch",
+    "class",
+    "const",
+    "continue",
+    "debugger",
+    "default",
+    "delete",
+    "do",
+    "else",
+    "export",
+    "extends",
+    "false",
+    "finally",
+    "for",
+    "function",
+    "if",
+    "import",
+    "in",
+    "instanceof",
+    "new",
+    "null",
+    "return",
+    "super",
+    "switch",
+    "this",
+    "throw",
+    "true",
+    "try",
+    "typeof",
+    "var",
+    "void",
+    "while",
+    "with",
+];
+
+#[allow(unused)] // reason: Will be used later
+pub const RESERVED_WORDS_EXTENDED_STRICT: [&str; 3] = [
+    "let",
+    "static",
+    "yield",
+];
+
+#[allow(unused)] // reason: Will be used later
+pub const RESERVED_WORDS_EXTENDED_MODULE_OR_ASYNC: [&str; 1] = [
+    "await",
+];
+
+#[allow(unused)] // reason: Will be used later
+pub const FUTURE_RESERVED_WORDS: [&str; 1] = [
+    "enum",
+];
+
+#[allow(unused)] // reason: Will be used later
+pub const FUTURE_RESERVED_WORDS_EXTENDED_STRICT: [&str; 6] = [
+    "implements",
+    "interface",
+    "package",
+    "private",
+    "protected",
+    "public",
+];
+
+#[allow(unused)] // reason: Will be used later
+pub const FUTURE_RESERVED_WORDS_OLD_VERSIONS: [&str; 16] = [
+    "abstract",
+    "boolean",
+    "byte",
+    "char",
+    "double",
+    "final",
+    "float",
+    "goto",
+    "int",
+    "long",
+    "native",
+    "short",
+    "synchronized",
+    "throws",
+    "transient",
+    "volatile",
+];
+
+#[allow(unused)] // reason: Will be used later
+pub const SPECIAL_IDENTIFIERS_IN_CONTEXT: [&str; 8] = [
+    "arguments",
+    "as",
+    "async",
+    "eval",
+    "from",
+    "get",
+    "of",
+    "set",
+];
+
+#[allow(unused)] // reason: Will be used later
+pub const STRING_QUANTIFIERS: [char; 3] = [
+    '"',
+    '\'',
+    '`',
+];
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