Pass arguments to wasm-bindgen #1534

rafaelbeckel · 2025-11-12T03:40:03Z

This PR implements support for passing arbitrary flags to wasm-bindgen via wasm-pack build.

Addresses #1092

CLI changes

New repeatable flag: --wbg-arg (alias: --wbg)
- Example usage:
  - wasm-pack build --wbg-arg --experimental-reset-state-function
  - wasm-pack build --wbg-arg --weak-refs --wbg-arg --reference-types

Implementation

BuildOptions: add wbg_arg: Vec (Clap v4, allow_hyphen_values, visible_alias = "wbg").
Build: store bindgen_args and plumb through the build pipeline.
bindgen::wasm_bindgen_build: accept &[String] of args and append them to the wasm-bindgen Command (after defaults, so users can override if desired).
docs: Document the new flag with examples.
tests: Add an integration test asserting that a forwarded unknown flag is visible in the wasm-bindgen invocation (proves passthrough).

- Add repeatable --wbg-arg (alias: --wbg) to forward args to wasm-bindgen - Wire args through build pipeline and bindgen invocation - Docs: usage examples and notes - Tests: verify passthrough forwards unknown flag

- Quiet test: suppress unexpected_cfg warnings via RUSTFLAGS - Generate/new tests: default template now rustwasm/wasm-pack-template to avoid auth issues

This reverts commit 83b056e.

rafaelbeckel · 2025-11-12T14:13:56Z

src/command/mod.rs

        #[clap(
            long = "template",
-            default_value = "https://github.com/drager/wasm-pack-template"
+            default_value = "https://github.com/rustwasm/wasm-pack-template"


Suggested change

default_value = "https://github.com/rustwasm/wasm-pack-template"

default_value = "https://github.com/drager/wasm-pack-template"

src/build/wasm_target.rs

src/command/build.rs

src/command/login.rs

src/command/utils.rs

src/readme.rs

src/npm.rs

src/command/login.rs

src/manifest/mod.rs

rafaelbeckel added 4 commits November 12, 2025 04:34

build: add --wbg-arg passthrough to wasm-bindgen

cd2e121

- Add repeatable --wbg-arg (alias: --wbg) to forward args to wasm-bindgen - Wire args through build pipeline and bindgen invocation - Docs: usage examples and notes - Tests: verify passthrough forwards unknown flag

chore(clippy): apply automated lint fixes

4aa7b7f

test: stabilize CI

83b056e

- Quiet test: suppress unexpected_cfg warnings via RUSTFLAGS - Generate/new tests: default template now rustwasm/wasm-pack-template to avoid auth issues

Revert "test: stabilize CI"

bdfb6c9

This reverts commit 83b056e.

rafaelbeckel commented Nov 12, 2025

View reviewed changes

rafaelbeckel changed the title ~~feat(build): add --wbg-arg passthrough to wasm-bindgen~~ Pass arguments to wasm-bindgen Nov 15, 2025