Security News
Research
Data Theft Repackaged: A Case Study in Malicious Wrapper Packages on npm
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
ts-deepmerge
Advanced tools
A deep merge function that automatically infers the return type based on your input, without mutating the source objects.
Objects and arrays will be merged, but values such as numbers and strings will be overwritten.
All merging/overwriting occurs in the order of the arguments you provide the function with.
Both ESM and CommonJS are supported by this package.
import { merge } from "ts-deepmerge";
const obj1 = {
a: {
a: 1
}
};
const obj2 = {
b: {
a: 2,
b: 2
}
};
const obj3 = {
a: {
b: 3
},
b: {
b: 3,
c: 3
},
c: 3
};
const result = merge(obj1, obj2, obj3);
The value of the above result
is:
{
"a": {
"a": 1,
"b": 3
},
"b": {
"a": 2,
"b": 3,
"c": 3
},
"c": 3
}
If you would like to provide options to change the merge behaviour, you can use the .withOptions
method:
import { merge } from "ts-deepmerge";
const obj1 = {
array: ["A"],
};
const obj2 = {
array: ["B"],
}
const result = merge.withOptions(
{ mergeArrays: false },
obj1,
obj2
);
The value of the above result
is:
{
"array": ["B"]
}
All options have JSDoc descriptions in its source.
There's currently a limitation with the inferred return type that ts-deepmerge
offers, where it's
unable to take the order of the objects/properties into consideration due to the nature of accepting
an infinite number of objects to merge as args and what TypeScript currently offers to infer the types.
The primary use case for the inferred return type is for basic object primitives, to offer something
more useful as the return type, which does work for a lot of cases.
If you're working with generic declared types though, this can cause the inferred return type to not align
with what you may expect, as it currently detects every possible value and combines them as a union type.
When working with declared types, and you know what the final type will align to, simply use the as
keyword
as shown in the example below:
interface IObj {
a: string;
b: string;
}
const obj1: IObj = { a: "1", b: "2", };
const obj2: Partial<IObj> = { a: "1" };
const result = merge(obj1, obj2) as IObj;
More context can be found in this issue.
FAQs
A TypeScript deep merge function.
The npm package ts-deepmerge receives a total of 341,577 weekly downloads. As such, ts-deepmerge popularity was classified as popular.
We found that ts-deepmerge demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
Research
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
Research
Security News
Attackers used a malicious npm package typosquatting a popular ESLint plugin to steal sensitive data, execute commands, and exploit developer systems.
Security News
The Ultralytics' PyPI Package was compromised four times in one weekend through GitHub Actions cache poisoning and failure to rotate previously compromised API tokens.