# ArkCompiler Subsystem Changelog

## cl.ArkCompiler.1 ArkTS Syntax Rule Change

Since OpenHarmony SDK 4.1.5.5, the ArkTS syntax rules are changed as follows.

**Removed**

**arkts-no-decorators-except-arkui**, **arkts-no-side-effects-imports**, **arkts-no-regexp-literals**

**Downgraded**

The severity level of **rules arkts-no-globalthis** and **arkts-no-classes-as-obj** is lowered to warning, which means that they do not block project compilation.

Rule **arkts-no-func-apply-bind-call** is split into the following two rules:
1. **arkts-no-func-apply-call**, at error level
2. **arkts-no-func-bind**, at level warning

Compared with that in the earlier version, the quantity of highlighted code and total number of errors remain unchanged.

**Relaxed**

Rule **arkts-identifiers-as-prop-names** is relaxed. Attribute names can be string literals or string type enumeration constants.

No error is reported in the following code:

```
enum Test {
  A = 'aaa',
  B = 'bbb'
}

let obj: Record<string, number> = {
  [Test.A]: 1,   // String type enumeration constants
  [Test.B]: 2,   // String type enumeration constants
  ['value']: 3   // String literal
}
```

**Change Impact**

There is no compatibility impact. No code adaptation is required.

## cl.ArkCompiler.2 TS Check Change for Third-party Packages

**Access Level**

Other

**Reason for Change**

Code in third-party packages in the **oh_modules** directory must comply with the TS syntax specifications. In versions earlier than 4.0.10.3, an error is reported for any noncompliance. However, due to code implementation, no error is reported for such noncompliance since 4.0.10.3. This change is made to rectify the issue.

**Change Since**

OpenHarmony SDK 4.1.5.5

**Change Impact**

If code that does not comply with TS syntax specifications is contained in a third-party package, an error is reported during compilation.

For example, if a third-party package contains the following code:
```
let a: string = 1;
```

The following error is reported during compilation:

```
Type 'number' is not assignable to type 'string'.
```

**Adaptation Guide**

Make sure all code in the third-party package complies with the TS syntax specifications.