mirror of
https://github.com/roc-lang/roc.git
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53 lines
2.0 KiB
Bash
Executable File
53 lines
2.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# This script
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# 1. Uses cargo to build the Roc compiler as a .wasm file (build.rs is part of this step only)
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# 2. Further optimizes the .wasm, and generates JavaScript code to interface with it
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#
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# After running this, we zip the generated assets and host them somewhere public on the web.
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# Our website deployment script downloads that zipfile and copies the files into www/build/repl/
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# We use this two-step process because Netlify times out if we try to build the Web REPL there.
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# https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
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set -euxo pipefail
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if ! which wasm-pack
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then
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echo "To build the Web REPL, you need to run 'cargo install wasm-pack'"
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exit 1
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fi
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SCRIPT_RELATIVE_DIR=$(dirname "${BASH_SOURCE[0]}")
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cd $SCRIPT_RELATIVE_DIR
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mkdir -p build
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rm -rf build/*
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# We want a release build, but with debug info (to get stack traces for Wasm backend panics)
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# This configuration is called `--profiling`
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wasm-pack build --profiling --target web -- --features console_error_panic_hook
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cp -v pkg/roc_repl_wasm.js build
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# To disable optimizations while debugging, do `export REPL_DEBUG=1` before running the script
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if [ "${REPL_DEBUG:-}" == "" ] && which wasm-opt
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then
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wasm-opt -Os --debuginfo pkg/roc_repl_wasm_bg.wasm -o build/roc_repl_wasm_bg.wasm
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else
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echo "wasm-opt is not installed. Skipping .wasm optimization."
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cp -v pkg/roc_repl_wasm_bg.wasm build
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fi
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# Copy the JS from wasm_bindgen, replacing its invalid `import` statement with a `var`.
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# The JS import from the invalid path 'env', seems to be generated when there are unresolved symbols.
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BINDGEN_FILE="roc_repl_wasm.js"
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echo 'var __wbg_star0 = { now: Date.now };' > build/$BINDGEN_FILE
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grep -v '^import' pkg/$BINDGEN_FILE >> build/$BINDGEN_FILE
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# As of July 2022, the .wasm file is ~4MB, shrinking to ~1MB with Brotli compression (which Netlify does)
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echo "Generated REPL assets for website:"
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ls -l build
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TARFILE=${1:-roc_repl_wasm.tar.gz}
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cd build
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tar cvzf $TARFILE *
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