@cdktf/hcl2json
Version:
Transform HCL into JSON
53 lines • 6.75 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.deepMerge = void 0;
// Copyright (c) HashiCorp, Inc
// SPDX-License-Identifier: MPL-2.0
/**
* Merges `source` into `target`, overriding any existing values.
* `undefined` will cause a value to be deleted.
*/
function deepMerge(target, ...sources) {
for (const source of sources) {
if (typeof source !== "object" || typeof target !== "object") {
throw new Error(`Invalid usage. Both source (${JSON.stringify(source)}) and target (${JSON.stringify(target)}) must be objects`);
}
for (const key of Object.keys(source)) {
const value = source[key];
if (typeof value === "object" && value != null && !Array.isArray(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] = {};
}
deepMerge(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) {
delete target[key];
}
}
else if (typeof value === "object" &&
value != null &&
Array.isArray(value)) {
if (Array.isArray(target[key])) {
target[key] = [...target[key], ...value];
}
else {
target[key] = value;
}
}
else if (value === undefined) {
delete target[key];
}
else {
target[key] = value;
}
}
}
return target;
}
exports.deepMerge = deepMerge;
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