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All apps/Wasmtime

Wasmtime

wasmtime

A standalone runtime for WebAssembly.

Runs as wasmtime|macOS, Linux, Windows|wasmtime.dev

Open form in Otty otty.toml

Sync rules

What travels, what stays, what never leaves

Wasmtime in your home directory Every rule on this page, by file

cache.directory

Each machine keeps its own copy of these.

Only what the catalog names. A directory that syncs brings everything inside it except what is listed as excluded here.

apps/wasmtime/otty.tomlThe file this page is generated from

id = "wasmtime"

name = "Wasmtime"

homepage = "https://wasmtime.dev/"

description = "A standalone runtime for WebAssembly."

executables = ["wasmtime"]

[dotfiles]

# https://docs.wasmtime.dev/cli-cache.html documents the TOML cache config

# created by `wasmtime config new`; the generated API docs at

# https://docs.rs/wasmtime/latest/wasmtime/struct.CacheConfig.html identify

# its Unix default as $HOME/.config/wasmtime/config.toml. [appData] has that

# XDG spelling on Linux and the platform-native config spelling on macOS.

paths = ["[appData]/wasmtime/config.toml"]

exclude = []

secret = []

side_effect = false

# The cache directory is an absolute, machine-local storage choice from the

# documented [cache] table, so retain it for backup but do not apply it.

[[dotfiles.machine_lines]]

file = "[appData]/wasmtime/config.toml"

match = { key_path = ["cache.directory"] }

scope = "backup"

[commands]

format = 1

label = "Run a WebAssembly file"

description = "Run a .wasm or .wat file, optionally calling one export. Wasmtime flags must precede the file; program arguments follow it. The -O/-C/-D/-W/-S tuning options are left out."

quality = "ai-draft"

parser = { end_of_options = "--", interleave = "posix", long_equals = true, short_attached = true, short_bundles = false }

[[commands.source]]

id = "docs"

kind = "manual"

url = "https://docs.wasmtime.dev/cli-options.html"

revision = "2026-10-27"

evidence = """

wasmtime run foo.wasm

wasmtime foo.wat

wasmtime --dir . foo.wasm

wasmtime run --invoke initialize foo.wasm

wasmtime run --invoke add add.wasm 1 2

All Wasmtime options must come before the WebAssembly file provided. All arguments afterwards are passed to the WebAssembly file itself.

"""

[[commands.field]]

id = "dir"

label = "Directory to expose to the program"

type = "path"

path = { kind = "directory", role = "input" }

option = ["--dir"]

multiple = true

sources = ["docs"]

[[commands.field]]

id = "invoke"

label = "Export to invoke instead of the main entry"

type = "string"

option = ["--invoke"]

sources = ["docs"]

[[commands.field]]

id = "module"

label = "WebAssembly file"

type = "path"

path = { kind = "file", role = "input" }

position = 0

sources = ["docs"]

[[commands.field]]

id = "args"

label = "Program arguments"

type = "string"

position = 1

multiple = true

sources = ["docs"]

[[commands.task]]

id = "run"

label = "Run a program"

fields = ["module", "args", "dir"]

required = ["module"]

[[commands.task]]

id = "invoke"

label = "Call one export"

fields = ["module", "invoke", "args"]

required = ["module", "invoke"]

[[commands.group]]

id = "basic"

label = "Basic"

fields = ["module", "args", "dir", "invoke"]

Use it with your dotfile manager

Same data, in the shape your tool already reads

Opens Otty and adds this tool to what it syncs

Opens otty://sync/add/wasmtime. Otty ships with this catalog, so the link only has to name the tool — nothing is downloaded.

Every one of these is generated from the same rules as this page. None of them splits cache.directory for you — that part is Otty’s own sync, or a template you write by hand.