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camc314
109 lines
4.2 KiB
TypeScript
109 lines
4.2 KiB
TypeScript
// Build configuration.
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//
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// 5 builds out of one source tree - the entry point, and the printer over the 2 build-time feature flags.
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// The plugin order matters: `strip_ts` is a text transform, so it has to run before the plugins which parse.
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import { defineConfig } from "tsdown";
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import removeAssertsPlugin from "./tsdown_plugins/remove_asserts.ts";
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import stripTsPlugin from "./tsdown_plugins/strip_ts.ts";
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import unmapWritesPlugin from "./tsdown_plugins/unmap_writes.ts";
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import constFunctionsPlugin from "./tsdown_plugins/const_functions.ts";
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const isEnabled = (env: string | undefined) => env === "true" || env === "1";
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// When run with `pnpm run build-dev`, generate a debug build with extra assertions.
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// This is the build prepared by `pnpm run build-test` for conformance tests.
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// It replaces the release build in `dist`, so rebuild with `pnpm run build` before benchmarking.
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const DEBUG = isEnabled(process.env.DEBUG);
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// Only remove assertions in release build. Debug builds keep `debugAssert` calls live.
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const assertPlugins = DEBUG ? [] : [removeAssertsPlugin];
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// Global constants defined at build time. See `src-js/globals.d.ts`.
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// `DEBUG: false` lets the minifier remove the body of `debugAssert` and any other debug-only code.
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const definedGlobals = { DEBUG: DEBUG ? "true" : "false" };
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// Base config.
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// `platform: "node"` because the entry point loads the printer with `createRequire`.
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const commonConfig = defineConfig({
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platform: "node",
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target: "node20",
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outDir: "dist",
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format: "esm",
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unbundle: false,
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hash: false,
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fixedExtension: false,
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// `scripts/build.ts` deletes `dist` before TSDown runs.
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// This allows generating all 5 builds into the same directory.
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clean: false,
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plugins: [...assertPlugins],
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inputOptions: {
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// For plugins
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experimental: { nativeMagicString: true },
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},
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});
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// Minification options.
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// Release builds are minified in full - that is what is published, and it is half the size.
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// Debug builds keep names and whitespace, so `dist` stays readable while working on the printer.
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const minifyConfig = DEBUG
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? {
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compress: { keepNames: { function: true, class: true } },
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mangle: false,
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codegen: { removeWhitespace: false },
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}
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: true;
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// One printer build. The printer is built 4 times from `src-js/print/index.ts`,
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// over 2 build-time feature flags (see `src-js/globals.d.ts`):
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//
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// - `SOURCEMAPS`: Source map support costs a little speed even when unused.
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// - `TS`: TypeScript syntax support. JS-only builds lose all the TS field checks (via minifier dead-code removal)
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// and the TS switch arms + printer functions (via `strip_ts.ts`).
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//
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// `src-js/index.ts` loads whichever build the caller's options call for.
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//
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// In builds without source maps, nothing reads the `node` argument the mapping writes take,
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// so `unmap_writes` rewrites every `writeWithMap` / `writeWithMapNoLast` call, and the imports
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// which bring them in, into the plain `write` / `writeNoLast` they become without it.
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const printerConfig = (name: string, { sourcemaps, ts }: { sourcemaps: boolean; ts: boolean }) => ({
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...commonConfig,
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minify: minifyConfig,
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// Only the entry point's types are published
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dts: false,
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entry: { [name]: "src-js/print/index.ts" },
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define: {
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...definedGlobals,
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SOURCEMAPS: sourcemaps ? "true" : "false",
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TS: ts ? "true" : "false",
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},
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plugins: [
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// `strip_ts` is a text transform, so must run before the AST-based plugins
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...(ts ? [] : [stripTsPlugin()]),
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...(sourcemaps ? [] : [unmapWritesPlugin]),
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constFunctionsPlugin,
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...assertPlugins,
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],
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});
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export default defineConfig([
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// Entry point
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{
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...commonConfig,
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entry: { index: "src-js/index.ts" },
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minify: minifyConfig,
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dts: true,
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define: definedGlobals,
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deps: {
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// The printer builds are loaded at runtime, so must not be bundled in
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neverBundle: ["./print_js.js", "./print_js_maps.js", "./print_ts.js", "./print_ts_maps.js"],
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},
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},
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// Printers
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printerConfig("print_js", { sourcemaps: false, ts: false }),
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printerConfig("print_js_maps", { sourcemaps: true, ts: false }),
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printerConfig("print_ts", { sourcemaps: false, ts: true }),
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printerConfig("print_ts_maps", { sourcemaps: true, ts: true }),
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]);
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