Cross-platform sed is a pain.

package.json

@@ -27,7 +27,7 @@
 	},
 	"scripts": {
 		"version": "cd packages/wp-types && npm version $(node -p -e \"require('../../package.json').version\") && git add .",
-		"build-wp-types": "json2ts -i schema.json -o packages/wp-types/index.ts --style.trailingComma=all --style.useTabs && cat packages/wp-types/append.ts >> packages/wp-types/index.ts && sed -i '' 's/export interface WP_REST_API_Partial_/interface WP_REST_API_Partial_/g' packages/wp-types/index.ts",
+		"build-wp-types": "json2ts -i schema.json -o packages/wp-types/index.ts --style.trailingComma=all --style.useTabs && cat packages/wp-types/append.ts >> packages/wp-types/index.ts && sed -i.bak 's/export interface WP_REST_API_Partial_/interface WP_REST_API_Partial_/g' packages/wp-types/index.ts && rm packages/wp-types/index.ts.bak",
 		"test-wp-types": "tsc packages/wp-types/tests/test.ts --noEmit --strict --target es2015",
 		"validate": "ajv compile --spec=draft2019 --strict --strict-schema=false -c ajv-formats -m tests/external-schemas/hyper-schema.json -s schema.json -r \"schemas/**/*.json\""
 	}