vscode subproperty (microsoft/dev-container-spec#1)

extensions/configuration-editing/schemas/devContainer.schema.src.json

@@ -306,6 +306,36 @@
 							}
 						}
 					]
+				},
+				"vscode": {
+					"type": "object",
+					"properties": {
+						"extensions": {
+							"type": "array",
+							"description": "An array of extensions that should be installed into the container.",
+							"items": {
+								"type": "string",
+								"pattern": "^([a-z0-9A-Z][a-z0-9A-Z-]*)\\.([a-z0-9A-Z][a-z0-9A-Z-]*)(@(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\\+([0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*))?)?$",
+								"errorMessage": "Expected format: '${publisher}.${name}' or '${publisher}.${name}@${version}'. Example: 'ms-dotnettools.csharp'."
+							}
+						},
+						"settings": {
+							"$ref": "vscode://schemas/settings/machine",
+							"description": "Machine specific settings that should be copied into the container. These are only copied when connecting to the container for the first time, rebuilding the container then triggers it again."
+						},
+						"devPort": {
+							"type": "integer",
+							"description": "The port VS Code can use to connect to its backend."
+						}
+					}
+				},
+				"customizations": {
+					"type": "object",
+					"additionalProperties": {
+						"type": "object",
+						"additionalProperties": true
+					},
+					"description": "Tool-specific configuration. Each tool should use a JSON object subproperty with a unique name to group its customizations."
 				}
 			}
 		},