@aws/pdk
Version:
All documentation is located at: https://aws.github.io/aws-pdk
110 lines • 13.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.cloneDeep = cloneDeep;
exports.isEmpty = isEmpty;
exports.asUndefinedIfEmpty = asUndefinedIfEmpty;
exports.deepMerge = deepMerge;
/*! Copyright [Amazon.com](http://amazon.com/), Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0 */
const util_1 = require("projen/lib/util");
/**
* Utility to deeply clone a value
* @param value Value to clone
* @returns Cloned value
*/
function cloneDeep(value) {
return JSON.parse(JSON.stringify(value));
}
/** Indicates if value is considered empty */
function isEmpty(value) {
if (value == null)
return true;
if (typeof value === "boolean") {
return false;
}
if (typeof value === "string") {
return value.length === 0;
}
if (Array.isArray(value)) {
return value.length === 0;
}
if ((0, util_1.isObject)(value)) {
return Object.keys(value).length === 0;
}
return false;
}
/** Replace empty value with undefined */
function asUndefinedIfEmpty(value) {
if (isEmpty(value))
return undefined;
return value;
}
/**
* Recursively merge objects together into a new object with extends support for appending arrays.
*
* This is a clone of [projen/lib/util#deepMerge](https://github.com/projen/projen/blob/55ac3657a270285db63e1a6008b3848b36775626/src/util.ts#L218-L281)
* with added functionality to support appending arrays.
*
* @see [projen/lib/util#deepMerge](https://github.com/projen/projen/blob/55ac3657a270285db63e1a6008b3848b36775626/src/util.ts#L218-L281)
*/
function deepMerge(objects, options) {
const append = options?.append ?? false;
const destructive = options?.destructive ?? false;
objects = objects.map(cloneDeep);
if (append === false)
return (0, util_1.deepMerge)(objects, destructive);
function mergeOne(target, source) {
for (const key of Object.keys(source)) {
const value = source[key];
if ((0, util_1.isObject)(value)) {
// if the value at the target is not an object, override it with an
// object so we can continue the recursion
if (typeof target[key] !== "object") {
target[key] = value;
}
if (Array.isArray(value)) {
if (Array.isArray(target[key])) {
target[key].push(...value);
}
else {
target[key] = value;
}
}
mergeOne(target[key], value);
// if the result of the merge is an empty object, it's because the
// eventual value we assigned is `undefined`, and there are no
// sibling concrete values alongside, so we can delete this tree.
const output = target[key];
if (typeof output === "object" &&
Object.keys(output).length === 0 &&
destructive) {
delete target[key];
}
}
else if (value === undefined && destructive) {
delete target[key];
}
else if (Array.isArray(value)) {
if (Array.isArray(target[key])) {
// Append to existing array
target[key].push(...value);
}
else {
// Override with array value
target[key] = value;
}
}
else if (typeof value !== "undefined") {
target[key] = value;
}
}
}
const others = objects.filter((x) => x != null);
if (others.length === 0) {
return {};
}
const into = others.splice(0, 1)[0];
others.forEach((other) => mergeOne(into, other));
return into;
}
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Copyright [Amazon.com](http://amazon.com/), Inc. or its affiliates. All Rights Reserved.\nSPDX-License-Identifier: Apache-2.0 */\nimport { Obj, deepMerge as _deepMerge, isObject } from \"projen/lib/util\";\n\n/**\n * Utility to deeply clone a value\n * @param value Value to clone\n * @returns Cloned value\n */\nexport function cloneDeep(value: any): any {\n  return JSON.parse(JSON.stringify(value));\n}\n\n/** Indicates if value is considered empty */\nexport function isEmpty(value: any): boolean {\n  if (value == null) return true;\n  if (typeof value === \"boolean\") {\n    return false;\n  }\n  if (typeof value === \"string\") {\n    return value.length === 0;\n  }\n  if (Array.isArray(value)) {\n    return value.length === 0;\n  }\n  if (isObject(value)) {\n    return Object.keys(value).length === 0;\n  }\n  return false;\n}\n\n/** Replace empty value with undefined */\nexport function asUndefinedIfEmpty(value: any): any | undefined {\n  if (isEmpty(value)) return undefined;\n  return value;\n}\n\n/** Options for deep merge function */\nexport interface DeepMergeOptions {\n  /**\n   * Append array values\n   * @default false\n   */\n  readonly append?: boolean;\n  /**\n   * `undefined`s will cause a value to be deleted if destructive is enabled.\n   * @default false\n   */\n  readonly destructive?: boolean;\n}\n\n/**\n * Recursively merge objects together into a new object with extends support for appending arrays.\n *\n * This is a clone of [projen/lib/util#deepMerge](https://github.com/projen/projen/blob/55ac3657a270285db63e1a6008b3848b36775626/src/util.ts#L218-L281)\n * with added functionality to support appending arrays.\n *\n * @see [projen/lib/util#deepMerge](https://github.com/projen/projen/blob/55ac3657a270285db63e1a6008b3848b36775626/src/util.ts#L218-L281)\n */\nexport function deepMerge(\n  objects: Array<Obj<any>>,\n  options?: DeepMergeOptions\n): Obj<any> {\n  const append = options?.append ?? false;\n  const destructive = options?.destructive ?? false;\n\n  objects = objects.map(cloneDeep);\n\n  if (append === false) return _deepMerge(objects, destructive);\n\n  function mergeOne(target: any, source: any) {\n    for (const key of Object.keys(source)) {\n      const value = source[key];\n      if (isObject(value)) {\n        // if the value at the target is not an object, override it with an\n        // object so we can continue the recursion\n        if (typeof target[key] !== \"object\") {\n          target[key] = value;\n        }\n        if (Array.isArray(value)) {\n          if (Array.isArray(target[key])) {\n            target[key].push(...value);\n          } else {\n            target[key] = value;\n          }\n        }\n        mergeOne(target[key], value);\n        // if the result of the merge is an empty object, it's because the\n        // eventual value we assigned is `undefined`, and there are no\n        // sibling concrete values alongside, so we can delete this tree.\n        const output = target[key];\n        if (\n          typeof output === \"object\" &&\n          Object.keys(output).length === 0 &&\n          destructive\n        ) {\n          delete target[key];\n        }\n      } else if (value === undefined && destructive) {\n        delete target[key];\n      } else if (Array.isArray(value)) {\n        if (Array.isArray(target[key])) {\n          // Append to existing array\n          target[key].push(...value);\n        } else {\n          // Override with array value\n          target[key] = value;\n        }\n      } else if (typeof value !== \"undefined\") {\n        target[key] = value;\n      }\n    }\n  }\n  const others = objects.filter((x) => x != null);\n  if (others.length === 0) {\n    return {};\n  }\n  const into = others.splice(0, 1)[0];\n  others.forEach((other) => mergeOne(into, other));\n  return into;\n}\n"]}