rollup.config.js

/**
 * @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */

import { nodeResolve } from '@rollup/plugin-node-resolve';
import typescript from '@rollup/plugin-typescript';
import uglify from 'rollup-plugin-uglify';

const PREAMBLE = `/**
    * @license
    * Copyright ${(new Date).getFullYear()} Google LLC. All Rights Reserved.
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
    * distributed under the License is distributed on an "AS IS" BASIS,
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    * =============================================================================
    */`;

function minify() {
  return uglify({output: {preamble: PREAMBLE}});
}

function config({plugins = [], output = {}}) {
  return {
    input: 'src/index.ts',
    plugins: [
      typescript({module: 'ES2015', sourceMap: true}),
      nodeResolve(),
      ...plugins
    ],
    output: {
      banner: PREAMBLE,
      globals: {
	'@tensorflow/tfjs-core': 'tf',
      },
      ...output
    },
    external: [
      '@tensorflow/tfjs-core',
    ],
  };
}

export default [
  config({
    output: {
      format: 'umd',
      name: 'knnClassifier',
      file: 'dist/knn-classifier.js'
    }
  }),
  config({
    plugins: [minify()],
    output: {
      format: 'umd',
      name: 'knnClassifier',
      file: 'dist/knn-classifier.min.js'
    }
  }),
  config({
    plugins: [minify()],
    output: {
      format: 'es',
      file: 'dist/knn-classifier.esm.js',
    }
  })
];