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diff --git a/lib/sqlalchemy/util/deprecations.py b/lib/sqlalchemy/util/deprecations.py
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+++ b/lib/sqlalchemy/util/deprecations.py
@@ -0,0 +1,417 @@
+# util/deprecations.py
+# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: https://www.opensource.org/licenses/mit-license.php
+
+"""Helpers related to deprecation of functions, methods, classes, other
+functionality."""
+
+import os
+import re
+
+from . import compat
+from .langhelpers import _hash_limit_string
+from .langhelpers import _warnings_warn
+from .langhelpers import decorator
+from .langhelpers import inject_docstring_text
+from .langhelpers import inject_param_text
+from .. import exc
+
+
+SQLALCHEMY_WARN_20 = False
+
+if os.getenv("SQLALCHEMY_WARN_20", "false").lower() in ("true", "yes", "1"):
+    SQLALCHEMY_WARN_20 = True
+
+
+def _warn_with_version(msg, version, type_, stacklevel, code=None):
+    if (
+        issubclass(type_, exc.Base20DeprecationWarning)
+        and not SQLALCHEMY_WARN_20
+    ):
+        return
+
+    warn = type_(msg, code=code)
+    warn.deprecated_since = version
+
+    _warnings_warn(warn, stacklevel=stacklevel + 1)
+
+
+def warn_deprecated(msg, version, stacklevel=3, code=None):
+    _warn_with_version(
+        msg, version, exc.SADeprecationWarning, stacklevel, code=code
+    )
+
+
+def warn_deprecated_limited(msg, args, version, stacklevel=3, code=None):
+    """Issue a deprecation warning with a parameterized string,
+    limiting the number of registrations.
+
+    """
+    if args:
+        msg = _hash_limit_string(msg, 10, args)
+    _warn_with_version(
+        msg, version, exc.SADeprecationWarning, stacklevel, code=code
+    )
+
+
+def warn_deprecated_20(msg, stacklevel=3, code=None):
+
+    _warn_with_version(
+        msg,
+        exc.RemovedIn20Warning.deprecated_since,
+        exc.RemovedIn20Warning,
+        stacklevel,
+        code=code,
+    )
+
+
+def deprecated_cls(version, message, constructor="__init__"):
+    header = ".. deprecated:: %s %s" % (version, (message or ""))
+
+    def decorate(cls):
+        return _decorate_cls_with_warning(
+            cls,
+            constructor,
+            exc.SADeprecationWarning,
+            message % dict(func=constructor),
+            version,
+            header,
+        )
+
+    return decorate
+
+
+def deprecated_20_cls(
+    clsname, alternative=None, constructor="__init__", becomes_legacy=False
+):
+    message = (
+        ".. deprecated:: 1.4 The %s class is considered legacy as of the "
+        "1.x series of SQLAlchemy and %s in 2.0."
+        % (
+            clsname,
+            "will be removed"
+            if not becomes_legacy
+            else "becomes a legacy construct",
+        )
+    )
+
+    if alternative:
+        message += " " + alternative
+
+    if becomes_legacy:
+        warning_cls = exc.LegacyAPIWarning
+    else:
+        warning_cls = exc.RemovedIn20Warning
+
+    def decorate(cls):
+        return _decorate_cls_with_warning(
+            cls,
+            constructor,
+            warning_cls,
+            message,
+            warning_cls.deprecated_since,
+            message,
+        )
+
+    return decorate
+
+
+def deprecated(
+    version,
+    message=None,
+    add_deprecation_to_docstring=True,
+    warning=None,
+    enable_warnings=True,
+):
+    """Decorates a function and issues a deprecation warning on use.
+
+    :param version:
+      Issue version in the warning.
+
+    :param message:
+      If provided, issue message in the warning.  A sensible default
+      is used if not provided.
+
+    :param add_deprecation_to_docstring:
+      Default True.  If False, the wrapped function's __doc__ is left
+      as-is.  If True, the 'message' is prepended to the docs if
+      provided, or sensible default if message is omitted.
+
+    """
+
+    # nothing is deprecated "since" 2.0 at this time.  All "removed in 2.0"
+    # should emit the RemovedIn20Warning, but messaging should be expressed
+    # in terms of "deprecated since 1.4".
+
+    if version == "2.0":
+        if warning is None:
+            warning = exc.RemovedIn20Warning
+        version = "1.4"
+    if add_deprecation_to_docstring:
+        header = ".. deprecated:: %s %s" % (
+            version,
+            (message or ""),
+        )
+    else:
+        header = None
+
+    if message is None:
+        message = "Call to deprecated function %(func)s"
+
+    if warning is None:
+        warning = exc.SADeprecationWarning
+
+    if warning is not exc.RemovedIn20Warning:
+        message += " (deprecated since: %s)" % version
+
+    def decorate(fn):
+        return _decorate_with_warning(
+            fn,
+            warning,
+            message % dict(func=fn.__name__),
+            version,
+            header,
+            enable_warnings=enable_warnings,
+        )
+
+    return decorate
+
+
+def moved_20(message, **kw):
+    return deprecated(
+        "2.0", message=message, warning=exc.MovedIn20Warning, **kw
+    )
+
+
+def deprecated_20(api_name, alternative=None, becomes_legacy=False, **kw):
+    type_reg = re.match("^:(attr|func|meth):", api_name)
+    if type_reg:
+        type_ = {"attr": "attribute", "func": "function", "meth": "method"}[
+            type_reg.group(1)
+        ]
+    else:
+        type_ = "construct"
+    message = (
+        "The %s %s is considered legacy as of the "
+        "1.x series of SQLAlchemy and %s in 2.0."
+        % (
+            api_name,
+            type_,
+            "will be removed"
+            if not becomes_legacy
+            else "becomes a legacy construct",
+        )
+    )
+
+    if ":attr:" in api_name:
+        attribute_ok = kw.pop("warn_on_attribute_access", False)
+        if not attribute_ok:
+            assert kw.get("enable_warnings") is False, (
+                "attribute %s will emit a warning on read access.  "
+                "If you *really* want this, "
+                "add warn_on_attribute_access=True.  Otherwise please add "
+                "enable_warnings=False." % api_name
+            )
+
+    if alternative:
+        message += " " + alternative
+
+    if becomes_legacy:
+        warning_cls = exc.LegacyAPIWarning
+    else:
+        warning_cls = exc.RemovedIn20Warning
+
+    return deprecated("2.0", message=message, warning=warning_cls, **kw)
+
+
+def deprecated_params(**specs):
+    """Decorates a function to warn on use of certain parameters.
+
+    e.g. ::
+
+        @deprecated_params(
+            weak_identity_map=(
+                "0.7",
+                "the :paramref:`.Session.weak_identity_map parameter "
+                "is deprecated."
+            )
+
+        )
+
+    """
+
+    messages = {}
+    versions = {}
+    version_warnings = {}
+
+    for param, (version, message) in specs.items():
+        versions[param] = version
+        messages[param] = _sanitize_restructured_text(message)
+        version_warnings[param] = (
+            exc.RemovedIn20Warning
+            if version == "2.0"
+            else exc.SADeprecationWarning
+        )
+
+    def decorate(fn):
+        spec = compat.inspect_getfullargspec(fn)
+
+        if spec.defaults is not None:
+            defaults = dict(
+                zip(
+                    spec.args[(len(spec.args) - len(spec.defaults)) :],
+                    spec.defaults,
+                )
+            )
+            check_defaults = set(defaults).intersection(messages)
+            check_kw = set(messages).difference(defaults)
+        else:
+            check_defaults = ()
+            check_kw = set(messages)
+
+        check_any_kw = spec.varkw
+
+        @decorator
+        def warned(fn, *args, **kwargs):
+            for m in check_defaults:
+                if (defaults[m] is None and kwargs[m] is not None) or (
+                    defaults[m] is not None and kwargs[m] != defaults[m]
+                ):
+                    _warn_with_version(
+                        messages[m],
+                        versions[m],
+                        version_warnings[m],
+                        stacklevel=3,
+                    )
+
+            if check_any_kw in messages and set(kwargs).difference(
+                check_defaults
+            ):
+
+                _warn_with_version(
+                    messages[check_any_kw],
+                    versions[check_any_kw],
+                    version_warnings[check_any_kw],
+                    stacklevel=3,
+                )
+
+            for m in check_kw:
+                if m in kwargs:
+                    _warn_with_version(
+                        messages[m],
+                        versions[m],
+                        version_warnings[m],
+                        stacklevel=3,
+                    )
+            return fn(*args, **kwargs)
+
+        doc = fn.__doc__ is not None and fn.__doc__ or ""
+        if doc:
+            doc = inject_param_text(
+                doc,
+                {
+                    param: ".. deprecated:: %s %s"
+                    % ("1.4" if version == "2.0" else version, (message or ""))
+                    for param, (version, message) in specs.items()
+                },
+            )
+        decorated = warned(fn)
+        decorated.__doc__ = doc
+        return decorated
+
+    return decorate
+
+
+def _sanitize_restructured_text(text):
+    def repl(m):
+        type_, name = m.group(1, 2)
+        if type_ in ("func", "meth"):
+            name += "()"
+        return name
+
+    text = re.sub(r":ref:`(.+) <.*>`", lambda m: '"%s"' % m.group(1), text)
+    return re.sub(r"\:(\w+)\:`~?(?:_\w+)?\.?(.+?)`", repl, text)
+
+
+def _decorate_cls_with_warning(
+    cls, constructor, wtype, message, version, docstring_header=None
+):
+    doc = cls.__doc__ is not None and cls.__doc__ or ""
+    if docstring_header is not None:
+
+        if constructor is not None:
+            docstring_header %= dict(func=constructor)
+
+        if issubclass(wtype, exc.Base20DeprecationWarning):
+            docstring_header += (
+                " (Background on SQLAlchemy 2.0 at: "
+                ":ref:`migration_20_toplevel`)"
+            )
+        doc = inject_docstring_text(doc, docstring_header, 1)
+
+        if type(cls) is type:
+            clsdict = dict(cls.__dict__)
+            clsdict["__doc__"] = doc
+            clsdict.pop("__dict__", None)
+            clsdict.pop("__weakref__", None)
+            cls = type(cls.__name__, cls.__bases__, clsdict)
+            if constructor is not None:
+                constructor_fn = clsdict[constructor]
+
+        else:
+            cls.__doc__ = doc
+            if constructor is not None:
+                constructor_fn = getattr(cls, constructor)
+
+        if constructor is not None:
+            setattr(
+                cls,
+                constructor,
+                _decorate_with_warning(
+                    constructor_fn, wtype, message, version, None
+                ),
+            )
+    return cls
+
+
+def _decorate_with_warning(
+    func, wtype, message, version, docstring_header=None, enable_warnings=True
+):
+    """Wrap a function with a warnings.warn and augmented docstring."""
+
+    message = _sanitize_restructured_text(message)
+
+    if issubclass(wtype, exc.Base20DeprecationWarning):
+        doc_only = (
+            " (Background on SQLAlchemy 2.0 at: "
+            ":ref:`migration_20_toplevel`)"
+        )
+    else:
+        doc_only = ""
+
+    @decorator
+    def warned(fn, *args, **kwargs):
+        skip_warning = not enable_warnings or kwargs.pop(
+            "_sa_skip_warning", False
+        )
+        if not skip_warning:
+            _warn_with_version(message, version, wtype, stacklevel=3)
+        return fn(*args, **kwargs)
+
+    doc = func.__doc__ is not None and func.__doc__ or ""
+    if docstring_header is not None:
+        docstring_header %= dict(func=func.__name__)
+
+        docstring_header += doc_only
+
+        doc = inject_docstring_text(doc, docstring_header, 1)
+
+    decorated = warned(func)
+    decorated.__doc__ = doc
+    decorated._sa_warn = lambda: _warn_with_version(
+        message, version, wtype, stacklevel=3
+    )
+    return decorated