build: refactor build system (#8324)

build.config.ts

@@ -0,0 +1,93 @@
+import { relative, resolve } from 'node:path';
+import glob from 'fast-glob';
+import typescript from 'rollup-plugin-typescript2';
+import { defineBuildConfig, BuildEntry } from 'unbuild';
+
+interface ConfigOptions {
+	entries: (BuildEntry | string)[];
+	minify: boolean;
+	emitCJS: boolean;
+	externals: string[];
+	cjsBridge: boolean;
+	sourcemap: boolean;
+	preserveModules: boolean;
+	preserveModulesRoot: string;
+	declaration: boolean;
+	typeCheck: boolean;
+}
+
+export function createUnbuildConfig({
+	entries = [{ builder: 'rollup', input: 'src/index' }],
+	minify = false,
+	emitCJS = true,
+	cjsBridge = true,
+	externals = [],
+	sourcemap = true,
+	preserveModules = true,
+	preserveModulesRoot = 'src',
+	declaration = true,
+	typeCheck = false,
+}: Partial<ConfigOptions> = {}) {
+	const files = glob
+		.sync('**', { cwd: 'src' })
+		.map((file) => [`${file.slice(0, -2)}cjs`, `${file.slice(0, -2)}mjs`])
+		.flat();
+
+	return defineBuildConfig({
+		entries,
+		clean: true,
+		rollup: {
+			esbuild: {
+				minify,
+				minifyIdentifiers: false,
+			},
+			emitCJS,
+			cjsBridge,
+			json: {
+				namedExports: false,
+			},
+		},
+
+		externals: [...files, ...externals],
+
+		hooks: {
+			'rollup:options': (_, options) => {
+				// @ts-expect-error: This will always be an array
+				// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+				options.output![0] = {
+					// @ts-expect-error: This will always be an array
+					...options.output![0],
+					sourcemap,
+					preserveModules,
+					preserveModulesRoot,
+				};
+
+				if (emitCJS) {
+					// @ts-expect-error: This will always be an array
+					// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+					options.output![1] = {
+						// @ts-expect-error: This will always be an array
+						...options.output![1],
+						sourcemap,
+						preserveModules,
+						preserveModulesRoot,
+					};
+				}
+
+				if (declaration) {
+					options.plugins?.unshift(
+						typescript({
+							check: typeCheck,
+							tsconfig: relative(__dirname, resolve(process.cwd(), 'tsconfig.json')),
+							tsconfigOverride: {
+								compilerOptions: {
+									emitDeclarationOnly: true,
+								},
+							},
+						}),
+					);
+				}
+			},
+		},
+	});
+}