rollup-plugin-ngc/rollup-plugin-ngc.es.js

Rollup plugin for angular with ivy enable

import { join, dirname, resolve } from 'path';
import { ScriptTarget, ModuleKind, ModuleResolutionKind } from 'typescript';
import { createProgram, createCompilerHost } from '@angular/compiler-cli';
import { existsSync, statSync, readdirSync } from 'fs';
import { buildOptimizer } from '@angular-devkit/build-optimizer';

function resolver(extensions) {
  const _extensions = ["ts", ...extensions != null ? extensions : []];
  const resolveFile = (resolved, index = false) => {
    for (const extension of _extensions) {
      const file = index ? join(resolved, `index.${extension}`) : `${resolved}.${extension}`;
      if (existsSync(file))
        return file;
    }
  };
  return function resolveId(id, origin) {
    if (!origin || id.includes("node_modules"))
      return id;
    const resolved = join(dirname(origin), id);
    const file = resolveFile(resolved);
    if (file)
      return file;
    if (existsSync(resolved) && statSync(resolved).isDirectory()) {
      const coreFile = resolveFile(resolved, true);
      if (coreFile)
        return coreFile;
    }
  };
}

function compile(opts) {
  const {id, host, options, files} = opts;
  const programm = createProgram({rootNames: [id], options, host});
  programm.emit();
  const file = id.replace(".ts", "");
  const map = files.get(`${file}.js.map`);
  const code = files.get(`${file}.js`);
  return {
    code: (code != null ? code : "").replace(/\/\/# sourceMappingURL.*/, ""),
    map
  };
}

const defautSideEffects = (sideEffectFreeModules) => {
  const sideEffects = readdirSync("node_modules/@angular").map((effect) => join("node_modules/@angular", effect));
  return [
    ...sideEffects,
    "node_modules/rxjs",
    ...sideEffectFreeModules != null ? sideEffectFreeModules : []
  ].map((p) => p.replace(/\\/g, "/"));
};
function optimizer(content, id, options) {
  const normalizedId = id.replace(/\\/g, "/");
  const isSideEffectFree = options.sideEffectFreeModules && options.sideEffectFreeModules.some((m) => normalizedId.indexOf(m) >= 0);
  const isAngularCoreFile = options.angularCoreModules && options.angularCoreModules.some((m) => normalizedId.indexOf(m) >= 0);
  const result = buildOptimizer({
    content,
    inputFilePath: id,
    emitSourceMap: true,
    isSideEffectFree,
    isAngularCoreFile
  });
  return {
    code: result.content,
    map: result.sourceMap
  };
}

function ngcPlugin(options) {
  let host, files = new Map(), sideEffectFreeModules;
  const {target = "es2018", rootDir = "src", sourceMap = true} = options;
  const opts = {
    target: ScriptTarget[target.toLocaleUpperCase()],
    module: ModuleKind.ESNext,
    lib: ["dom", "es2015", "es2017", "es2018", "es2019"],
    rootDir: resolve(rootDir),
    moduleResolution: ModuleResolutionKind.NodeJs,
    esModuleInterop: true,
    declaration: false,
    experimentalDecorators: true,
    emitDecoratorMetadata: true,
    enableIvy: true,
    sourceMap
  };
  return {
    name: "ngc",
    buildStart: () => {
      var _a;
      sideEffectFreeModules = defautSideEffects((_a = options == null ? void 0 : options.buildOptimizer) == null ? void 0 : _a.sideEffectFreeModules);
      host = createCompilerHost({options: opts});
      host.writeFile = (fileName, contents) => files.set(fileName, contents);
    },
    resolveId: resolver(),
    transform(code, id) {
      var _a;
      if (!id.includes("node_modules")) {
        return compile({id: resolve(id).replace(/\\/g, "/"), host, options: opts, files});
      }
      return optimizer(code, id, {
        sideEffectFreeModules,
        angularCoreModules: (_a = options == null ? void 0 : options.buildOptimizer) == null ? void 0 : _a.angularCoreModules
      });
    }
  };
}

export { ngcPlugin };