commit eceb8d19ba9da3c7d07fc5a12636027d499a3a06
Author: Max <max@privatevoid.net>
Date:   Sat Dec 17 13:57:49 2022 +0100

    yaml to json for 2.17.0

diff --git a/dvc/dvcfile.py b/dvc/dvcfile.py
index 04db6d5f..4eb40e90 100644
--- a/dvc/dvcfile.py
+++ b/dvc/dvcfile.py
@@ -14,7 +14,7 @@ from dvc.stage.exceptions import (
 from dvc.types import AnyPath
 from dvc.utils import relpath
 from dvc.utils.collections import apply_diff
-from dvc.utils.serialize import dump_yaml, modify_yaml
+from dvc.utils.serialize import dump_json, modify_json
 
 if TYPE_CHECKING:
     from dvc.repo import Repo
@@ -24,7 +24,7 @@ _T = TypeVar("_T")
 
 DVC_FILE = "Dvcfile"
 DVC_FILE_SUFFIX = ".dvc"
-PIPELINE_FILE = "dvc.yaml"
+PIPELINE_FILE = "dvc.json"
 PIPELINE_LOCK = "dvc.lock"
 
 
@@ -147,7 +147,7 @@ class FileMixin:
             raise StageFileIsNotDvcFileError(self.path)
 
         self._check_gitignored()
-        return self._load_yaml(**kwargs)
+        return self._load_json(**kwargs)
 
     @classmethod
     def validate(cls, d: _T, fname: str = None) -> _T:
@@ -155,7 +155,7 @@ class FileMixin:
 
         return validate(d, cls.SCHEMA, path=fname)  # type: ignore[arg-type]
 
-    def _load_yaml(self, **kwargs: Any) -> Tuple[Any, str]:
+    def _load_json(self, **kwargs: Any) -> Tuple[Any, str]:
         from dvc.utils import strictyaml
 
         return strictyaml.load(
@@ -198,7 +198,7 @@ class SingleStageFile(FileMixin):
         if self.verify:
             check_dvcfile_path(self.repo, self.path)
         logger.debug("Saving information to '%s'.", relpath(self.path))
-        dump_yaml(self.path, serialize.to_single_stage_file(stage))
+        dump_json(self.path, serialize.to_single_stage_file(stage))
         self.repo.scm_context.track_file(self.relpath)
 
     def remove_stage(self, stage):  # pylint: disable=unused-argument
@@ -214,7 +214,7 @@ class SingleStageFile(FileMixin):
 
 
 class PipelineFile(FileMixin):
-    """Abstraction for pipelines file, .yaml + .lock combined."""
+    """Abstraction for pipelines file, .json + .lock combined."""
 
     from dvc.schema import COMPILED_MULTI_STAGE_SCHEMA as SCHEMA
     from dvc.stage.loader import StageLoader as LOADER
@@ -251,7 +251,7 @@ class PipelineFile(FileMixin):
         self._check_if_parametrized(stage)
         stage_data = serialize.to_pipeline_file(stage)
 
-        with modify_yaml(self.path, fs=self.repo.fs) as data:
+        with modify_json(self.path, fs=self.repo.fs) as data:
             if not data:
                 logger.info("Creating '%s'", self.relpath)
 
@@ -295,7 +295,7 @@ class PipelineFile(FileMixin):
         if not self.exists():
             return
 
-        d, _ = self._load_yaml(round_trip=True)
+        d, _ = self._load_json(round_trip=True)
         if stage.name not in d.get("stages", {}):
             return
 
@@ -303,7 +303,7 @@ class PipelineFile(FileMixin):
         del d["stages"][stage.name]
 
         if d["stages"]:
-            dump_yaml(self.path, d)
+            dump_json(self.path, d)
         else:
             super().remove()
 
@@ -365,7 +365,7 @@ class Lockfile(FileMixin):
     def dump(self, stage, **kwargs):
         stage_data = serialize.to_lockfile(stage)
 
-        with modify_yaml(self.path, fs=self.repo.fs) as data:
+        with modify_json(self.path, fs=self.repo.fs) as data:
             version = LOCKFILE_VERSION.from_dict(data)
             if version == LOCKFILE_VERSION.V1:
                 logger.info(
@@ -394,7 +394,7 @@ class Lockfile(FileMixin):
         if not self.exists():
             return
 
-        d, _ = self._load_yaml(round_trip=True)
+        d, _ = self._load_json(round_trip=True)
         version = LOCKFILE_VERSION.from_dict(d)
         data = d if version == LOCKFILE_VERSION.V1 else d.get("stages", {})
         if stage.name not in data:
@@ -404,7 +404,7 @@ class Lockfile(FileMixin):
         del data[stage.name]
 
         if data:
-            dump_yaml(self.path, d)
+            dump_json(self.path, d)
         else:
             self.remove()
 
@@ -425,7 +425,7 @@ DVCFile = Union["PipelineFile", "SingleStageFile"]
 
 def make_dvcfile(repo: "Repo", path: AnyPath, **kwargs: Any) -> DVCFile:
     _, ext = os.path.splitext(str(path))
-    if ext in [".yaml", ".yml"]:
+    if ext in [".json", ".yml"]:
         return PipelineFile(repo, path, **kwargs)
     # fallback to single stage file for better error messages
     return SingleStageFile(repo, path, **kwargs)