SnapshotFileSystem Interface

The file system methods required by checkSchemaCompatibilitySnapshots(options).

This API is provided as an alpha preview and may change without notice.

To use, import via fluid-framework/alpha.

For more information about our API support guarantees, see here.

Input

This type is "input," meaning that code outside of the library defining it should not read from it. Future versions of this type may add optional members or make typing of members more general.

Signature

export interface SnapshotFileSystem

Remarks

Implemented by both Node.js fs and path modules, but other implementations can be provided as needed.

Example

import path from "node:path";
import fs from "node:fs";

const nodeFileSystem: SnapshotFileSystem = { ...fs, ...path };

Methods

Method	Alerts	Return Type	Description
join(parentPath, childPath)	Alpha	string	Joins two path segments into a single path string.
mkdirSync(dir, options)	Alpha	void	How a TreeView using the snapshotted schema would report its compatibility with a document created with the current schema.
readdirSync(dir)	Alpha	readonly string[]	Reads the contents of a directory.
readFileSync(file, encoding)	Alpha	string	Reads a UTF-8 encoded file from disk and returns its contents as a string.
writeFileSync(file, data, options)	Alpha	void	Writes a UTF-8 encoded file to disk, replacing the file if it already exists.

Method Details

join

Joins two path segments into a single path string.

This API is provided as an alpha preview and may change without notice.

For more information about our API support guarantees, see here.

Signature

join(parentPath: string, childPath: string): string;

Parameters

Parameter	Type	Description
parentPath	string	The directory path.
childPath	string	Filename within parentPath directory.

Returns

The combined path string.

Return type: string

mkdirSync

How a TreeView using the snapshotted schema would report its compatibility with a document created with the current schema.

This API is provided as an alpha preview and may change without notice.

For more information about our API support guarantees, see here.

Signature

mkdirSync(dir: string, options: {
        recursive: true;
    }): void;

Parameters

Parameter	Type	Description
dir	string	Path of the directory to create.
options	{ recursive: true; }	Options indicating that creation should be recursive.

readdirSync

Reads the contents of a directory.

This API is provided as an alpha preview and may change without notice.

For more information about our API support guarantees, see here.

Signature

readdirSync(dir: string): readonly string[];

Parameters

Parameter	Type	Description
dir	string	Path of the directory to read.

Returns

An array of names of the directory entries.

Return type: readonly string[]

readFileSync

Reads a UTF-8 encoded file from disk and returns its contents as a string.

This API is provided as an alpha preview and may change without notice.

For more information about our API support guarantees, see here.

Signature

readFileSync(file: string, encoding: "utf8"): string;

Parameters

Parameter	Type	Description
file	string	Path to the file to read.
encoding	"utf8"	The text encoding to use when reading the file. Must be "utf8".

Returns

The contents of the file as a string.

Return type: string

writeFileSync

Writes a UTF-8 encoded file to disk, replacing the file if it already exists.

This API is provided as an alpha preview and may change without notice.

For more information about our API support guarantees, see here.

Signature

writeFileSync(file: string, data: string, options: {
        encoding: "utf8";
    }): void;

Parameters

Parameter	Type	Description
file	string	Path to the file to write.
data	string	String data to be written.
options	{ encoding: "utf8"; }	Options specifying that the encoding is UTF-8.