EmscriptenFS

Defined in: packages/runtime/src/wasm/types.ts:39

Emscripten’s in-memory filesystem API (MEMFS), exposed on module.FS.

wasmExec uses this to seed MEMFS with host files before main() and to sync modified files back to the host VFS after the program exits.

Properties

ErrnoError

ErrnoError: (errno) => Error

Defined in: packages/runtime/src/wasm/types.ts:71

Constructor for Emscripten FS errno errors (thrown by FS operations).

Parameters

errno

number

Returns

Error

Methods

cwd()

cwd(): string

Defined in: packages/runtime/src/wasm/types.ts:61

Current working directory inside MEMFS.

Returns

string

---

getStream()

getStream(fd): EmscriptenStream | null

Defined in: packages/runtime/src/wasm/types.ts:69

Look up an open stream by fd number; returns null if not open.

Parameters

fd

number

Returns

EmscriptenStream | null

---

isDir()

isDir(mode): boolean

Defined in: packages/runtime/src/wasm/types.ts:63

Returns true if mode has the directory bit set.

Parameters

mode

number

Returns

boolean

---

isLink()

isLink(mode): boolean

Defined in: packages/runtime/src/wasm/types.ts:65

Returns true if mode has the symlink bit set.

Parameters

mode

number

Returns

boolean

---

lstat()

lstat(path): EmscriptenFSStat

Defined in: packages/runtime/src/wasm/types.ts:53

Stat a path without following a terminal symlink.

Parameters

path

string

Returns

EmscriptenFSStat

---

makedev()

makedev(major, minor): number

Defined in: packages/runtime/src/wasm/types.ts:67

Pack (major, minor) into an Emscripten device number.

Parameters

major

number

minor

number

Returns

number

---

mkdir()

mkdir(path): void

Defined in: packages/runtime/src/wasm/types.ts:41

Create a directory at path. Throws ErrnoError if it already exists.

Parameters

path

string

Returns

void

---

readdir()

readdir(path): string[]

Defined in: packages/runtime/src/wasm/types.ts:49

List entries in a directory — includes . and ...

Parameters

path

string

Returns

string[]

---

readFile()

Call Signature

readFile(path, opts): Uint8Array

Defined in: packages/runtime/src/wasm/types.ts:45

Read a file as raw bytes.

Parameters

path

string

opts

encoding

"binary"

Returns

Uint8Array

Call Signature

readFile(path, opts?): string | Uint8Array<ArrayBufferLike>

Defined in: packages/runtime/src/wasm/types.ts:47

Read a file as a string (default) or bytes.

Parameters

path

string

opts?

encoding?

string

Returns

string | Uint8Array<ArrayBufferLike>

---

readlink()

readlink(path): string

Defined in: packages/runtime/src/wasm/types.ts:59

Read the target of a symlink.

Parameters

path

string

Returns

string

---

stat()

stat(path): EmscriptenFSStat

Defined in: packages/runtime/src/wasm/types.ts:51

Stat a path, following symlinks on the final component.

Parameters

path

string

Returns

EmscriptenFSStat

---

symlink()

symlink(target, path): void

Defined in: packages/runtime/src/wasm/types.ts:57

Create a symlink at path pointing to target.

Parameters

target

string

path

string

Returns

void

---

unlink()

unlink(path): void

Defined in: packages/runtime/src/wasm/types.ts:55

Remove a regular file.

Parameters

path

string

Returns

void

---

writeFile()

writeFile(path, data): void

Defined in: packages/runtime/src/wasm/types.ts:43

Write a file at path, creating or overwriting as needed.

Parameters

path

string

data

string | Uint8Array<ArrayBufferLike>

Returns

void