web

README

Excel Export: Web Drag-and-Drop

Overview

In this package, the Go program is compiled into WebAssembly, which is then called from the frontend layer.

The frontend layer itself is a Preact application written using Parcel bundler.

Building

Both go and node (with npm) needs to be installed to build. As usual, the prerequisite npm install needs to be run beforehand.

The go layer needs to be built first to be processed by the frontend. As such, the build script inside package.json actually consists of three steps scripted (for Linux, my dev env):

• build:go:generate: calls go generate (to extract wasm_exec.js for the active Go environtemnt into the src folder)
• build:go:build: calls go build (resulting in src/exportExcelPDFeStatement.wasm)
• build:fe: full frontend (parcel) build

Development

In my developing the web version, I use the excellent gow command for automatic rebuilds. I run these commands for development inside this directory:

1. GOOS=js GOARCH=wasm go generate
2. GOOS=js GOARCH=wasm gow build -o src/exportExcelPDFeStatement.wasm (continuously rebuild on any .go file changes)
3. (in another terminal) npm run start