message: restore copy sources script
diff: "main": "index.js",
  "typings": "index.d.ts",
  "scripts": {
  - "build": "npm-run-all clean_dist build_cjs build_esm5 build_esm2015 build_esm5_for_rollup build_umd build_types generate_packages bundlesize-check",
  + "build": "npm-run-all clean_dist copy_sources build_cjs build_esm5 build_esm2015 build_esm5_for_rollup build_umd build_types generate_packages bundlesize-check",
  "build_cjs": "npm-run-all clean_dist_cjs compile_dist_cjs",
  "build_esm5": "npm-run-all clean_dist_esm5 compile_dist_esm5",
  "build_esm5_for_rollup": "npm-run-all clean_dist_esm5_for_rollup compile_dist_esm5_for_rollup && mkdirp dist/esm5_for_rollup/node_modules",
  "compile_dist_esm2015": "tsc -p ./tsconfig/tsconfig.esm2015.json",
  "compile_dist_esm5_for_rollup": "tsc -p ./tsconfig/tsconfig.esm5.rollup.json",
  "compile_dist_types": "tsc -p ./tsconfig/tsconfig.types.json",
  + "copy_sources": "mkdirp dist && shx cp -r ./src/ ./dist/src",
  "generate_packages": "node .make-packages.js",
  "prepublish": "shx rm -rf ./typings && npm run build",
  "bundlesize-check": "bundlesize",
  