Struct WasmConfig 

pub struct WasmConfig {

    pub package_name: Option<String>,
    pub exclude_functions: Vec<String>,
    pub exclude_types: Vec<String>,
    pub type_overrides: HashMap<String, String>,
    pub features: Option<Vec<String>>,
    pub extra_features: Vec<String>,
    pub serde_rename_all: Option<String>,
    pub type_prefix: Option<String>,
    pub env_shims: Vec<String>,
    pub extra_dependencies: HashMap<String, Value>,
    pub extra_dev_dependencies: HashMap<String, Value>,
    pub rename_fields: HashMap<String, String>,
    pub run_wrapper: Option<String>,
    pub extra_lint_paths: Vec<String>,
    pub crate_dir: Option<String>,
    pub core_crate_override: Option<String>,
    pub exclude_extra_dependencies: Vec<String>,
    pub custom_rust_modules: Vec<String>,
    pub exclude_fields: HashMap<String, Vec<String>>,
    pub source_crate_remaps: Vec<String>,
    pub languages: Vec<String>,
    pub targets: Vec<String>,
    pub wasm_opt: Vec<String>,
}

Fields

package_name: Option<String>

npm package name for the WASM package. Defaults to the Node package name with a trailing -node removed, plus -wasm.

exclude_functions: Vec<String>

exclude_types: Vec<String>

type_overrides: HashMap<String, String>

features: Option<Vec<String>>

extra_features: Vec<String>

Core-crate features to declare as opt-in passthrough features on the generated WASM binding crate without enabling them on its core dependency. Each entry name emits name = ["<core-crate>/name"] in [features].

serde_rename_all: Option<String>

Override the serde rename_all strategy for JSON field names (e.g. “camelCase”, “snake_case”). When set, this takes priority over the IR type-level serde_rename_all.

type_prefix: Option<String>

Prefix for generated type names (e.g. “Wasm” produces WasmConversionOptions). Defaults to "Wasm".

env_shims: Vec<String>

Wide-character C functions to shim for WASM external scanner interop.

extra_dependencies: HashMap<String, Value>

Additional Cargo dependencies for the WASM binding crate only.

extra_dev_dependencies: HashMap<String, Value>

Additional [dev-dependencies] entries for the generated WASM binding crate’s Cargo.toml. Declares test-only dependencies for hand-written test files (e.g. wasm-bindgen-test for in-crate #[wasm_bindgen_test] suites) without hand-editing the generated manifest.

rename_fields: HashMap<String, String>

Per-field name remapping for this language. Key is TypeName.field_name, value is the desired binding field name. Applied after automatic keyword escaping.

run_wrapper: Option<String>

Prefix wrapper for default tool invocations. When set, prepends this string to default commands across all pipelines (lint, test, build, etc.).

extra_lint_paths: Vec<String>

Extra paths to append to default lint commands (format, check, typecheck).

crate_dir: Option<String>

Overrides the default crates/{name}-wasm formula for the crate directory. Useful when the Rust crate directory does not follow the alef convention (e.g., consumer strips a -rs suffix so actual crate dir is crates/sample-markdown-wasm instead of crates/sample-markdown-rs-wasm). Used by setup, test, clean, and format tasks.

core_crate_override: Option<String>

Override the core Cargo dependency name and path for the WASM binding crate. When set, the binding Cargo.toml depends on this crate (resolved as ../<override>) instead of the umbrella [crate.name]. Use this to point the WASM binding at a wasm-safe sub-crate while other languages keep the facade. Defaults to unset.

exclude_extra_dependencies: Vec<String>

Keys to subtract from the merged extra_dependencies set for this language only. Useful when [crate.extra_dependencies] lists sibling crates that the WASM target cannot link.

custom_rust_modules: Vec<String>

Hand-written Rust modules to declare in the generated lib.rs with pub mod <name>; and re-export with pub use <name>::*;. This is the knob for Rust-side dispatch/glue modules under wasm. Note that [custom_modules].wasm is NOT consumed by the wasm backend (no code path reads it) — use this field instead.

exclude_fields: HashMap<String, Vec<String>>

Per-type field exclusions for the generated From impls and binding struct. Key is the type name (e.g. “ServerConfig”), value is a list of field names to skip. Use when source fields are gated behind #[cfg(not(target_arch = "wasm32"))] and therefore don’t exist in the wasm32 compilation environment.

source_crate_remaps: Vec<String>

Source crate names whose types are re-exported by the core_crate_override crate. References to <original_crate>::TypeName in generated code are rewritten to <override_crate>::TypeName. Only meaningful when core_crate_override is set. Example: with core_crate_override = "mylib-http", setting source_crate_remaps = ["mylib-core", "mylib"] rewrites mylib_core::Method and mylib::Method references to mylib_http::Method (assumes mylib-http re-exports them via pub use mylib_core::*).

languages: Vec<String>

List of static-compiled languages supported by WASM. When set, e2e smoke tests will auto-skip for languages not in this list, emitting .skip("not in WASM's static language set") for each unsupported language. This bridges the gap between the full 305-language pack and the 8-language WASM build compiled with SAMPLE_LANGUAGES=python,rust,javascript,typescript,go,html,css,json. Defaults to empty (all languages assumed supported).

targets: Vec<String>

wasm-pack build targets to generate and publish. Each entry produces a pkg/<target> build plus a build:wasm:<target> script; build:all builds exactly this set, and files/main/module/types are derived from it. Every target embeds its own full copy of the wasm binary, so restricting this to a single target (e.g. ["web"]) keeps the published npm package small — the web ES module is consumed by browsers, CDNs, bundlers, Deno (npm:), and Node 22+. Valid entries: web, bundler, nodejs, deno. Defaults to all four for backward compatibility.

wasm_opt: Vec<String>

wasm-opt pass arguments, emitted as [package.metadata.wasm-pack.profile.release] wasm-opt = [...]. When set to a non-empty list, wasm-pack runs wasm-opt with these flags (e.g. ["-Oz"] to minimize binary size, keeping large builds under a CDN per-file cap). Defaults to empty, which emits wasm-opt = false so wasm-pack skips the pass (the historical default; unchanged for consumers that don’t set it).

Trait Implementations

impl Clone for WasmConfig

fn clone(&self) -> WasmConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WasmConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for WasmConfig

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for WasmConfig

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl Serialize for WasmConfig

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.