@storybook/addon-coverage/dist/preset.js

Tools to support code coverage in Storybook

// src/preset.ts
import { fileURLToPath } from "url";

// src/constants.ts
var commonExtensions = [".js", ".mjs", ".cjs", ".ts", ".cts", ".mts"];
var defaultExtensions = [...commonExtensions, ".tsx", ".jsx", ".vue", ".svelte"];
var testFileExtensions = defaultExtensions.map((extension) => extension.slice(1)).join(",");
var configFileExtensions = commonExtensions.map((extension) => extension.slice(1)).join(",");
var defaultExclude = [
  "**/node_modules/**",
  ".storybook/**",
  "coverage/**",
  "packages/*/test{,s}/**",
  "**/*.d.ts",
  "**/*.mock.*",
  "test{,s}/**",
  `test{,-*}.{${testFileExtensions}}`,
  `**/*{.,-}{spec,story,stories,types}.{${testFileExtensions}}`,
  "**/__tests__/**",
  "**/*-entry.js",
  /* Exclude common development tool configuration files */
  `**/{ava,babel,nyc}.config.{${configFileExtensions}}`,
  `**/{jest,vitest}.config.{${configFileExtensions}}`,
  `**/{karma,rollup,webpack,vite}.config.{${configFileExtensions}}`,
  `**/.{eslint,mocha}rc.{${configFileExtensions}}`
];

// src/webpack5-exclude.ts
import TestExclude from "test-exclude";

// src/nyc-config.ts
import { loadNycConfig } from "@istanbuljs/load-nyc-config";
async function getNycConfig(opts = {}) {
  const cwd = opts.cwd ?? process.cwd();
  return loadNycConfig({
    cwd,
    nycrcPath: opts.nycrcPath
  });
}

// src/webpack5-exclude.ts
async function createTestExclude(opts = {}) {
  const { nycrcPath, include, exclude, extension } = opts;
  const cwd = opts.cwd ?? process.cwd();
  const nycConfig = await getNycConfig({
    cwd,
    nycrcPath
  });
  return new TestExclude({
    cwd,
    include: include ?? nycConfig.include,
    exclude: exclude ?? nycConfig.exclude ?? defaultExclude,
    extension: extension ?? nycConfig.extension ?? defaultExtensions,
    excludeNodeModules: true
  });
}

// src/preset.ts
import { createInstrumenter } from "istanbul-lib-instrument";
var viteFinal = async (viteConfig, options) => {
  const viteIstanbulPlugin = (await import("vite-plugin-istanbul")).default;
  const istanbul = viteIstanbulPlugin ?? viteIstanbulPlugin.default;
  console.log("[addon-coverage] Adding istanbul plugin to Vite config");
  viteConfig.build = viteConfig.build || {};
  viteConfig.build.sourcemap = true;
  viteConfig.plugins ||= [];
  viteConfig.plugins.push(
    istanbul({
      forceBuildInstrument: options.configType === "PRODUCTION",
      ...options.istanbul,
      include: Array.from(options.istanbul?.include || []),
      exclude: [options.configDir + "/**", ...defaultExclude, ...Array.from(options.istanbul?.exclude || [])],
      extension: options.istanbul?.extension || defaultExtensions
    })
  );
  return viteConfig;
};
var defaultOptions = {
  preserveComments: true,
  produceSourceMap: true,
  autoWrap: true,
  esModules: true,
  compact: false
};
var webpackFinal = async (webpackConfig, options) => {
  webpackConfig.module.rules ||= [];
  const nycConfig = await getNycConfig(options.istanbul);
  const extensions = options.istanbul?.extension ?? nycConfig.extension ?? defaultExtensions;
  console.log("[addon-coverage] Adding istanbul loader to Webpack config");
  const testExclude = await createTestExclude(options.istanbul);
  let instrumenterOptions = Object.assign(defaultOptions, options.istanbul);
  let instrumenter = createInstrumenter(instrumenterOptions);
  webpackConfig.module.rules.unshift({
    test: new RegExp(extensions?.join("|").replace(/\./g, "\\.")),
    loader: fileURLToPath(import.meta.resolve("@storybook/addon-coverage/loader/webpack5-istanbul-loader")),
    enforce: "post",
    options: {
      ...options.istanbul ?? {},
      instrumenter
    },
    include: (modulePath) => testExclude.shouldInstrument(modulePath)
  });
  return webpackConfig;
};
export {
  viteFinal,
  webpackFinal
};