custom-rule

Example: Custom Rule

Uses: @esmbly/transformer-flow, @esmbly-transformer-wasm

Summary

This example shows how to add a custom rule to a transformer.

The custom rule is defined in esmbly.config.js. It adds a default return type (and a warning) for functions that does not specify one. If you remove the custom rule and run the transformation again, you will get an error because the @esmbly-transformer-wasm requires all function to have return annotations.

# Input (Flow)
src/add.js

# Output (TypeScript, WebAssembly)
dist/add.ts
dist/add.wasm

Transforming the example

yarn run esmbly run

Running the tests

yarn test