diff --git a/packages/babel-types/src/constants.js b/packages/babel-types/src/constants.js
new file mode 100644
index 0000000000..7cccc83192
--- /dev/null
+++ b/packages/babel-types/src/constants.js
@@ -0,0 +1,24 @@
+export const STATEMENT_OR_BLOCK_KEYS = ["consequent", "body", "alternate"];
+export const FLATTENABLE_KEYS        = ["body", "expressions"];
+export const FOR_INIT_KEYS           = ["left", "init"];
+export const COMMENT_KEYS            = ["leadingComments", "trailingComments", "innerComments"];
+
+export const LOGICAL_OPERATORS = ["||", "&&"];
+export const UPDATE_OPERATORS  = ["++", "--"];
+
+export const BOOLEAN_NUMBER_BINARY_OPERATORS = [">", "<", ">=", "<="];
+export const EQUALITY_BINARY_OPERATORS       = ["==", "===", "!=", "!=="];
+export const COMPARISON_BINARY_OPERATORS     = [...EQUALITY_BINARY_OPERATORS, "in", "instanceof"];
+export const BOOLEAN_BINARY_OPERATORS        = [...COMPARISON_BINARY_OPERATORS, ...BOOLEAN_NUMBER_BINARY_OPERATORS];
+export const NUMBER_BINARY_OPERATORS         = ["-", "/", "*", "**", "&", "|", ">>", ">>>", "<<", "^"];
+export const BINARY_OPERATORS                = ["+", ...NUMBER_BINARY_OPERATORS, ...BOOLEAN_BINARY_OPERATORS];
+
+export const BOOLEAN_UNARY_OPERATORS = ["delete", "!"];
+export const NUMBER_UNARY_OPERATORS  = ["+", "-", "++", "--", "~"];
+export const STRING_UNARY_OPERATORS  = ["typeof"];
+export const UNARY_OPERATORS         = ["void", ...BOOLEAN_UNARY_OPERATORS, ...NUMBER_UNARY_OPERATORS, ...STRING_UNARY_OPERATORS];
+
+export const INHERIT_KEYS = {
+  optional: ["typeAnnotation", "typeParameters", "returnType"],
+  force: ["start", "loc", "end"]
+};